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tkUnixWm.c

/*
 * tkUnixWm.c --
 *
 *    This module takes care of the interactions between a Tk-based
 *    application and the window manager.  Among other things, it
 *    implements the "wm" command and passes geometry information
 *    to the window manager.
 *
 * Copyright (c) 1991-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tkUnixWm.c,v 1.1.1.1 2004/04/02 22:35:05 joye Exp $
 */

#include "tkPort.h"
#include "tkInt.h"
#include "tkUnixInt.h"
#include <errno.h>

/*
 * A data structure of the following type holds information for
 * each window manager protocol (such as WM_DELETE_WINDOW) for
 * which a handler (i.e. a Tcl command) has been defined for a
 * particular top-level window.
 */

typedef struct ProtocolHandler {
    Atom protocol;            /* Identifies the protocol. */
    struct ProtocolHandler *nextPtr;
                        /* Next in list of protocol handlers for
                         * the same top-level window, or NULL for
                         * end of list. */
    Tcl_Interp *interp;       /* Interpreter in which to invoke command. */
    char command[4];          /* Tcl command to invoke when a client
                         * message for this protocol arrives.
                         * The actual size of the structure varies
                         * to accommodate the needs of the actual
                         * command. THIS MUST BE THE LAST FIELD OF
                         * THE STRUCTURE. */
} ProtocolHandler;

#define HANDLER_SIZE(cmdLength) \
    ((unsigned) (sizeof(ProtocolHandler) - 3 + cmdLength))

/*
 * A data structure of the following type holds window-manager-related
 * information for each top-level window in an application.
 */

typedef struct TkWmInfo {
    TkWindow *winPtr;         /* Pointer to main Tk information for
                         * this window. */
    Window reparent;          /* If the window has been reparented, this
                         * gives the ID of the ancestor of the window
                         * that is a child of the root window (may
                         * not be window's immediate parent).  If
                         * the window isn't reparented, this has the
                         * value None. */
    char *title;        /* Title to display in window caption.  If
                         * NULL, use name of widget.  Malloced. */
    char *iconName;           /* Name to display in icon.  Malloced. */
    XWMHints hints;           /* Various pieces of information for
                         * window manager. */
    char *leaderName;         /* Path name of leader of window group
                         * (corresponds to hints.window_group).
                         * Malloc-ed.  Note:  this field doesn't
                         * get updated if leader is destroyed. */
    TkWindow *masterPtr;      /* Master window for TRANSIENT_FOR property,
                         * or NULL. */
    Tk_Window icon;           /* Window to use as icon for this window,
                         * or NULL. */
    Tk_Window iconFor;        /* Window for which this window is icon, or
                         * NULL if this isn't an icon for anyone. */
    int withdrawn;            /* Non-zero means window has been withdrawn. */

    /*
     * In order to support menubars transparently under X, each toplevel
     * window is encased in an additional window, called the wrapper,
     * that holds the toplevel and the menubar, if any.  The information
     * below is used to keep track of the wrapper and the menubar.
     */

    TkWindow *wrapperPtr;     /* Pointer to information about the wrapper.
                         * This is the "real" toplevel window as
                         * seen by the window manager. Although
                         * this is an official Tk window, it
                         * doesn't appear in the application's
                         * window hierarchy.  NULL means that
                         * the wrapper hasn't been created yet. */
    Tk_Window menubar;        /* Pointer to information about the
                         * menubar, or NULL if there is no
                         * menubar for this toplevel. */
    int menuHeight;           /* Amount of vertical space needed for
                         * menubar, measured in pixels.  If
                         * menubar is non-NULL, this is >= 1 (X
                         * servers don't like dimensions of 0). */

    /*
     * Information used to construct an XSizeHints structure for
     * the window manager:
     */

    int sizeHintsFlags;       /* Flags word for XSizeHints structure.
                         * If the PBaseSize flag is set then the
                         * window is gridded;  otherwise it isn't
                         * gridded. */
    int minWidth, minHeight;  /* Minimum dimensions of window, in
                         * grid units, not pixels. */
    int maxWidth, maxHeight;  /* Maximum dimensions of window, in
                         * grid units, not pixels. */
    Tk_Window gridWin;        /* Identifies the window that controls
                         * gridding for this top-level, or NULL if
                         * the top-level isn't currently gridded. */
    int widthInc, heightInc;  /* Increments for size changes (# pixels
                         * per step). */
    struct {
      int x;      /* numerator */
      int y;  /* denominator */
    } minAspect, maxAspect;   /* Min/max aspect ratios for window. */
    int reqGridWidth, reqGridHeight;
                        /* The dimensions of the window (in
                         * grid units) requested through
                         * the geometry manager. */
    int gravity;        /* Desired window gravity. */

    /*
     * Information used to manage the size and location of a window.
     */

    int width, height;        /* Desired dimensions of window, specified
                         * in grid units.  These values are
                         * set by the "wm geometry" command and by
                         * ConfigureNotify events (for when wm
                         * resizes window).  -1 means user hasn't
                         * requested dimensions. */
    int x, y;                 /* Desired X and Y coordinates for window.
                         * These values are set by "wm geometry",
                         * plus by ConfigureNotify events (when wm
                         * moves window).  These numbers are
                         * different than the numbers stored in
                         * winPtr->changes because (a) they could be
                         * measured from the right or bottom edge
                         * of the screen (see WM_NEGATIVE_X and
                         * WM_NEGATIVE_Y flags) and (b) if the window
                         * has been reparented then they refer to the
                         * parent rather than the window itself. */
    int parentWidth, parentHeight;
                        /* Width and height of reparent, in pixels
                         * *including border*.  If window hasn't been
                         * reparented then these will be the outer
                         * dimensions of the window, including
                         * border. */
    int xInParent, yInParent; /* Offset of wrapperPtr within reparent,
                         * measured in pixels from upper-left outer
                         * corner of reparent's border to upper-left
                         * outer corner of wrapperPtr's border.  If
                         * not reparented then these are zero. */
    int configWidth, configHeight;
                        /* Dimensions passed to last request that we
                         * issued to change geometry of the wrapper.
                         * Used to eliminate redundant resize
                         * operations. */

    /*
     * Information about the virtual root window for this top-level,
     * if there is one.
     */

    Window vRoot;       /* Virtual root window for this top-level,
                         * or None if there is no virtual root
                         * window (i.e. just use the screen's root). */
    int vRootX, vRootY;       /* Position of the virtual root inside the
                         * root window.  If the WM_VROOT_OFFSET_STALE
                         * flag is set then this information may be
                         * incorrect and needs to be refreshed from
                         * the X server.  If vRoot is None then these
                         * values are both 0. */
    int vRootWidth, vRootHeight;/* Dimensions of the virtual root window.
                         * If vRoot is None, gives the dimensions
                         * of the containing screen.  This information
                         * is never stale, even though vRootX and
                         * vRootY can be. */

    /*
     * Miscellaneous information.
     */

    ProtocolHandler *protPtr; /* First in list of protocol handlers for
                         * this window (NULL means none). */
    int cmdArgc;        /* Number of elements in cmdArgv below. */
    CONST char **cmdArgv;     /* Array of strings to store in the
                         * WM_COMMAND property.  NULL means nothing
                         * available. */
    char *clientMachine;      /* String to store in WM_CLIENT_MACHINE
                         * property, or NULL. */
    int flags;                /* Miscellaneous flags, defined below. */
    int numTransients;        /* number of transients on this window */
    struct TkWmInfo *nextPtr; /* Next in list of all top-level windows. */
} WmInfo;

/*
 * Flag values for WmInfo structures:
 *
 * WM_NEVER_MAPPED -          non-zero means window has never been
 *                      mapped;  need to update all info when
 *                      window is first mapped.
 * WM_UPDATE_PENDING -        non-zero means a call to UpdateGeometryInfo
 *                      has already been scheduled for this
 *                      window;  no need to schedule another one.
 * WM_NEGATIVE_X -            non-zero means x-coordinate is measured in
 *                      pixels from right edge of screen, rather
 *                      than from left edge.
 * WM_NEGATIVE_Y -            non-zero means y-coordinate is measured in
 *                      pixels up from bottom of screen, rather than
 *                      down from top.
 * WM_UPDATE_SIZE_HINTS -     non-zero means that new size hints need to be
 *                      propagated to window manager.
 * WM_SYNC_PENDING -          set to non-zero while waiting for the window
 *                      manager to respond to some state change.
 * WM_VROOT_OFFSET_STALE -    non-zero means that (x,y) offset information
 *                      about the virtual root window is stale and
 *                      needs to be fetched fresh from the X server.
 * WM_ABOUT_TO_MAP -          non-zero means that the window is about to
 *                      be mapped by TkWmMapWindow.  This is used
 *                      by UpdateGeometryInfo to modify its behavior.
 * WM_MOVE_PENDING -          non-zero means the application has requested
 *                      a new position for the window, but it hasn't
 *                      been reflected through the window manager
 *                      yet.
 * WM_COLORMAPS_EXPLICIT -    non-zero means the colormap windows were
 *                      set explicitly via "wm colormapwindows".
 * WM_ADDED_TOPLEVEL_COLORMAP - non-zero means that when "wm colormapwindows"
 *                      was called the top-level itself wasn't
 *                      specified, so we added it implicitly at
 *                      the end of the list.
 * WM_WIDTH_NOT_RESIZABLE -   non-zero means that we're not supposed to
 *                      allow the user to change the width of the
 *                      window (controlled by "wm resizable"
 *                      command).
 * WM_HEIGHT_NOT_RESIZABLE -  non-zero means that we're not supposed to
 *                      allow the user to change the height of the
 *                      window (controlled by "wm resizable"
 *                      command).
 * WM_WITHDRAWN -       non-zero means that this window has explicitly
 *                      been withdrawn. If it's a transient, it should
 *                      not mirror state changes in the master.
 */

#define WM_NEVER_MAPPED             1
#define WM_UPDATE_PENDING           2
#define WM_NEGATIVE_X               4
#define WM_NEGATIVE_Y               8
#define WM_UPDATE_SIZE_HINTS        0x10
#define WM_SYNC_PENDING             0x20
#define WM_VROOT_OFFSET_STALE       0x40
#define WM_ABOUT_TO_MAP             0x100
#define WM_MOVE_PENDING             0x200
#define WM_COLORMAPS_EXPLICIT       0x400
#define WM_ADDED_TOPLEVEL_COLORMAP  0x800
#define WM_WIDTH_NOT_RESIZABLE            0x1000
#define WM_HEIGHT_NOT_RESIZABLE           0x2000
#define WM_WITHDRAWN                      0x4000

/*
 * This module keeps a list of all top-level windows, primarily to
 * simplify the job of Tk_CoordsToWindow.  The list is called
 * firstWmPtr and is stored in the TkDisplay structure.
 */

/*
 * The following structures are the official type records for geometry
 * management of top-level and menubar windows.
 */

static void       TopLevelReqProc _ANSI_ARGS_((ClientData dummy,
                      Tk_Window tkwin));

static Tk_GeomMgr wmMgrType = {
    "wm",                     /* name */
    TopLevelReqProc,                /* requestProc */
    (Tk_GeomLostSlaveProc *) NULL,  /* lostSlaveProc */
};

static void       MenubarReqProc _ANSI_ARGS_((ClientData clientData,
                      Tk_Window tkwin));

static Tk_GeomMgr menubarMgrType = {
    "menubar",                      /* name */
    MenubarReqProc,                 /* requestProc */
    (Tk_GeomLostSlaveProc *) NULL,  /* lostSlaveProc */
};

/*
 * Structures of the following type are used for communication between
 * WaitForEvent, WaitRestrictProc, and WaitTimeoutProc.
 */

typedef struct WaitRestrictInfo {
    Display *display;         /* Window belongs to this display. */
    WmInfo *wmInfoPtr;
    int type;                 /* We only care about this type of event. */
    XEvent *eventPtr;         /* Where to store the event when it's found. */
    int foundEvent;           /* Non-zero means that an event of the
                         * desired type has been found. */
} WaitRestrictInfo;

/*
 * Forward declarations for procedures defined in this file:
 */

static int        ComputeReparentGeometry _ANSI_ARGS_((WmInfo *wmPtr));
static void       ConfigureEvent _ANSI_ARGS_((WmInfo *wmPtr,
                      XConfigureEvent *eventPtr));
static void       CreateWrapper _ANSI_ARGS_((WmInfo *wmPtr));
static void       GetMaxSize _ANSI_ARGS_((WmInfo *wmPtr,
                      int *maxWidthPtr, int *maxHeightPtr));
static void       MenubarDestroyProc _ANSI_ARGS_((ClientData clientData,
                      XEvent *eventPtr));
static int        ParseGeometry _ANSI_ARGS_((Tcl_Interp *interp,
                      char *string, TkWindow *winPtr));
static void       ReparentEvent _ANSI_ARGS_((WmInfo *wmPtr,
                      XReparentEvent *eventPtr));
static void       TkWmStackorderToplevelWrapperMap _ANSI_ARGS_((
                      TkWindow *winPtr,
                      Tcl_HashTable *reparentTable));
static void       TopLevelReqProc _ANSI_ARGS_((ClientData dummy,
                      Tk_Window tkwin));
static void       UpdateCommand _ANSI_ARGS_((TkWindow *winPtr));
static void       UpdateGeometryInfo _ANSI_ARGS_((
                      ClientData clientData));
static void       UpdateHints _ANSI_ARGS_((TkWindow *winPtr));
static void       UpdateSizeHints _ANSI_ARGS_((TkWindow *winPtr));
static void       UpdateVRootGeometry _ANSI_ARGS_((WmInfo *wmPtr));
static void       UpdateWmProtocols _ANSI_ARGS_((WmInfo *wmPtr));
static void       WaitForConfigureNotify _ANSI_ARGS_((TkWindow *winPtr,
                      unsigned long serial));
static int        WaitForEvent _ANSI_ARGS_((Display *display,
                      WmInfo *wmInfoPtr, int type, XEvent *eventPtr));
static void       WaitForMapNotify _ANSI_ARGS_((TkWindow *winPtr,
                      int mapped));
static Tk_RestrictAction
                  WaitRestrictProc _ANSI_ARGS_((ClientData clientData,
                      XEvent *eventPtr));
static void       WrapperEventProc _ANSI_ARGS_((ClientData clientData,
                      XEvent *eventPtr));
static void       WmWaitMapProc _ANSI_ARGS_((
                      ClientData clientData, XEvent *eventPtr));

static int        WmAspectCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmAttributesCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmClientCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmColormapwindowsCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmCommandCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmDeiconifyCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmFocusmodelCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmFrameCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmGeometryCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmGridCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmGroupCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmIconbitmapCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmIconifyCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmIconmaskCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmIconnameCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmIconpositionCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmIconwindowCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmMaxsizeCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmMinsizeCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmOverrideredirectCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmPositionfromCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmProtocolCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmResizableCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmSizefromCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmStackorderCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmStateCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmTitleCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmTransientCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static int        WmWithdrawCmd _ANSI_ARGS_((Tk_Window tkwin,
                      TkWindow *winPtr, Tcl_Interp *interp, int objc,
                      Tcl_Obj *CONST objv[]));
static void       WmUpdateGeom _ANSI_ARGS_((WmInfo *wmPtr,
                      TkWindow *winPtr));

/*
 *--------------------------------------------------------------
 *
 * TkWmCleanup --
 *
 *    This procedure is invoked to cleanup remaining wm resources
 *    associated with a display.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    All WmInfo structure resources are freed and invalidated.
 *
 *--------------------------------------------------------------
 */

void TkWmCleanup(dispPtr)
    TkDisplay *dispPtr;
{
    WmInfo *wmPtr, *nextPtr;
    for (wmPtr = dispPtr->firstWmPtr; wmPtr != NULL; wmPtr = nextPtr) {
      /*
       * We can't assume we have access to winPtr's anymore, so some
       * cleanup requiring winPtr data is avoided.
       */
      nextPtr = wmPtr->nextPtr;
      if (wmPtr->title != NULL) {
          ckfree(wmPtr->title);
      }
      if (wmPtr->iconName != NULL) {
          ckfree(wmPtr->iconName);
      }
      if (wmPtr->leaderName != NULL) {
          ckfree(wmPtr->leaderName);
      }
      if (wmPtr->menubar != NULL) {
          Tk_DestroyWindow(wmPtr->menubar);
      }
      if (wmPtr->wrapperPtr != NULL) {
          Tk_DestroyWindow((Tk_Window) wmPtr->wrapperPtr);
      }
      while (wmPtr->protPtr != NULL) {
          ProtocolHandler *protPtr;

          protPtr = wmPtr->protPtr;
          wmPtr->protPtr = protPtr->nextPtr;
          Tcl_EventuallyFree((ClientData) protPtr, TCL_DYNAMIC);
      }
      if (wmPtr->cmdArgv != NULL) {
          ckfree((char *) wmPtr->cmdArgv);
      }
      if (wmPtr->clientMachine != NULL) {
          ckfree((char *) wmPtr->clientMachine);
      }
      ckfree((char *) wmPtr);
    }
}

/*
 *--------------------------------------------------------------
 *
 * TkWmNewWindow --
 *
 *    This procedure is invoked whenever a new top-level
 *    window is created.  Its job is to initialize the WmInfo
 *    structure for the window.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    A WmInfo structure gets allocated and initialized.
 *
 *--------------------------------------------------------------
 */

void
TkWmNewWindow(winPtr)
    TkWindow *winPtr;         /* Newly-created top-level window. */
{
    register WmInfo *wmPtr;
    TkDisplay *dispPtr = winPtr->dispPtr;

    wmPtr = (WmInfo *) ckalloc(sizeof(WmInfo));
    memset(wmPtr, 0, sizeof(WmInfo));
    wmPtr->winPtr = winPtr;
    wmPtr->reparent = None;
    wmPtr->masterPtr = NULL;
    wmPtr->numTransients = 0;
    wmPtr->hints.flags = InputHint | StateHint;
    wmPtr->hints.input = True;
    wmPtr->hints.initial_state = NormalState;
    wmPtr->hints.icon_pixmap = None;
    wmPtr->hints.icon_window = None;
    wmPtr->hints.icon_x = wmPtr->hints.icon_y = 0;
    wmPtr->hints.icon_mask = None;
    wmPtr->hints.window_group = None;
    wmPtr->minWidth = wmPtr->minHeight = 1;

    /*
     * Default the maximum dimensions to the size of the display, minus
     * a guess about how space is needed for window manager decorations.
     */

    wmPtr->widthInc = wmPtr->heightInc = 1;
    wmPtr->minAspect.x = wmPtr->minAspect.y = 1;
    wmPtr->maxAspect.x = wmPtr->maxAspect.y = 1;
    wmPtr->reqGridWidth = wmPtr->reqGridHeight = -1;
    wmPtr->gravity = NorthWestGravity;
    wmPtr->width = -1;
    wmPtr->height = -1;
    wmPtr->x = winPtr->changes.x;
    wmPtr->y = winPtr->changes.y;
    wmPtr->parentWidth = winPtr->changes.width
          + 2*winPtr->changes.border_width;
    wmPtr->parentHeight = winPtr->changes.height
          + 2*winPtr->changes.border_width;
    wmPtr->configWidth = -1;
    wmPtr->configHeight = -1;
    wmPtr->vRoot = None;
    wmPtr->flags = WM_NEVER_MAPPED;
    wmPtr->nextPtr = (WmInfo *) dispPtr->firstWmPtr;
    dispPtr->firstWmPtr = wmPtr;
    winPtr->wmInfoPtr = wmPtr;

    UpdateVRootGeometry(wmPtr);

    /*
     * Arrange for geometry requests to be reflected from the window
     * to the window manager.
     */

    Tk_ManageGeometry((Tk_Window) winPtr, &wmMgrType, (ClientData) 0);
}

/*
 *--------------------------------------------------------------
 *
 * TkWmMapWindow --
 *
 *    This procedure is invoked to map a top-level window.  This
 *    module gets a chance to update all window-manager-related
 *    information in properties before the window manager sees
 *    the map event and checks the properties.  It also gets to
 *    decide whether or not to even map the window after all.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Properties of winPtr may get updated to provide up-to-date
 *    information to the window manager.  The window may also get
 *    mapped, but it may not be if this procedure decides that
 *    isn't appropriate (e.g. because the window is withdrawn).
 *
 *--------------------------------------------------------------
 */

void
TkWmMapWindow(winPtr)
    TkWindow *winPtr;         /* Top-level window that's about to
                         * be mapped. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    XTextProperty textProp;
    Tk_Uid string;

    if (wmPtr->flags & WM_NEVER_MAPPED) {
      Tcl_DString ds;

      wmPtr->flags &= ~WM_NEVER_MAPPED;

      /*
       * This is the first time this window has ever been mapped.
       * First create the wrapper window that provides space for a
       * menubar.
       */

      if (wmPtr->wrapperPtr == NULL) {
          CreateWrapper(wmPtr);
      }

      /*
       * Store all the window-manager-related information for the
       * window.
       */

      string = (wmPtr->title != NULL) ? wmPtr->title : winPtr->nameUid;
      Tcl_UtfToExternalDString(NULL, string, -1, &ds);
      string = Tcl_DStringValue(&ds);
      if (XStringListToTextProperty(&(Tcl_DStringValue(&ds)), 1,
            &textProp)  != 0) {
          XSetWMName(winPtr->display, wmPtr->wrapperPtr->window, &textProp);
          XFree((char *) textProp.value);
      }
      Tcl_DStringFree(&ds);

      TkWmSetClass(winPtr);

      if (wmPtr->iconName != NULL) {
          Tcl_UtfToExternalDString(NULL, wmPtr->iconName, -1, &ds);
          XSetIconName(winPtr->display, wmPtr->wrapperPtr->window,
                Tcl_DStringValue(&ds));
          Tcl_DStringFree(&ds);
      }

      if (wmPtr->masterPtr != NULL) {
          /*
           * Don't map a transient if the master is not mapped.
           */

          if (!Tk_IsMapped(wmPtr->masterPtr)) {
              wmPtr->withdrawn = 1;
              wmPtr->hints.initial_state = WithdrawnState;
          } else {
              XSetTransientForHint(winPtr->display, wmPtr->wrapperPtr->window,
                    wmPtr->masterPtr->wmInfoPtr->wrapperPtr->window);
          }
      }

      wmPtr->flags |= WM_UPDATE_SIZE_HINTS;
      UpdateHints(winPtr);
      UpdateWmProtocols(wmPtr);
      if (wmPtr->cmdArgv != NULL) {
          UpdateCommand(winPtr);
      }
      if (wmPtr->clientMachine != NULL) {
          Tcl_UtfToExternalDString(NULL, wmPtr->clientMachine, -1, &ds);
          if (XStringListToTextProperty(&(Tcl_DStringValue(&ds)), 1,
                &textProp) != 0) {
            XSetWMClientMachine(winPtr->display, wmPtr->wrapperPtr->window,
                  &textProp);
            XFree((char *) textProp.value);
          }
          Tcl_DStringFree(&ds);
      }
    }
    if (wmPtr->hints.initial_state == WithdrawnState) {
      return;
    }
    if (wmPtr->iconFor != NULL) {
      /*
       * This window is an icon for somebody else.  Make sure that
       * the geometry is up-to-date, then return without mapping
       * the window.
       */

      if (wmPtr->flags & WM_UPDATE_PENDING) {
          Tcl_CancelIdleCall(UpdateGeometryInfo, (ClientData) winPtr);
      }
      UpdateGeometryInfo((ClientData) winPtr);
      return;
    }
    wmPtr->flags |= WM_ABOUT_TO_MAP;
    if (wmPtr->flags & WM_UPDATE_PENDING) {
      Tcl_CancelIdleCall(UpdateGeometryInfo, (ClientData) winPtr);
    }
    UpdateGeometryInfo((ClientData) winPtr);
    wmPtr->flags &= ~WM_ABOUT_TO_MAP;

    /*
     * Map the window, then wait to be sure that the window manager has
     * processed the map operation.
     */

    XMapWindow(winPtr->display, wmPtr->wrapperPtr->window);
    if (wmPtr->hints.initial_state == NormalState) {
      WaitForMapNotify(winPtr, 1);
    }
}

/*
 *--------------------------------------------------------------
 *
 * TkWmUnmapWindow --
 *
 *    This procedure is invoked to unmap a top-level window.  The
 *    only thing it does special is to wait for the window actually
 *    to be unmapped.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Unmaps the window.
 *
 *--------------------------------------------------------------
 */

void
TkWmUnmapWindow(winPtr)
    TkWindow *winPtr;         /* Top-level window that's about to
                         * be mapped. */
{
    /*
     * It seems to be important to wait after unmapping a top-level
     * window until the window really gets unmapped.  I don't completely
     * understand all the interactions with the window manager, but if
     * we go on without waiting, and if the window is then mapped again
     * quickly, events seem to get lost so that we think the window isn't
     * mapped when in fact it is mapped.  I suspect that this has something
     * to do with the window manager filtering Map events (and possily not
     * filtering Unmap events?).
     */
    XUnmapWindow(winPtr->display, winPtr->wmInfoPtr->wrapperPtr->window);
    WaitForMapNotify(winPtr, 0);
}

/*
 *--------------------------------------------------------------
 *
 * TkWmDeadWindow --
 *
 *    This procedure is invoked when a top-level window is
 *    about to be deleted.  It cleans up the wm-related data
 *    structures for the window.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The WmInfo structure for winPtr gets freed up.
 *
 *--------------------------------------------------------------
 */

void
TkWmDeadWindow(winPtr)
    TkWindow *winPtr;         /* Top-level window that's being deleted. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    WmInfo *wmPtr2;

    if (wmPtr == NULL) {
      return;
    }
    if ((WmInfo *) winPtr->dispPtr->firstWmPtr == wmPtr) {
      winPtr->dispPtr->firstWmPtr = wmPtr->nextPtr;
    } else {
      register WmInfo *prevPtr;

      for (prevPtr = (WmInfo *) winPtr->dispPtr->firstWmPtr; ;
                prevPtr = prevPtr->nextPtr) {
          if (prevPtr == NULL) {
            panic("couldn't unlink window in TkWmDeadWindow");
          }
          if (prevPtr->nextPtr == wmPtr) {
            prevPtr->nextPtr = wmPtr->nextPtr;
            break;
          }
      }
    }
    if (wmPtr->title != NULL) {
      ckfree(wmPtr->title);
    }
    if (wmPtr->iconName != NULL) {
      ckfree(wmPtr->iconName);
    }
    if (wmPtr->hints.flags & IconPixmapHint) {
      Tk_FreeBitmap(winPtr->display, wmPtr->hints.icon_pixmap);
    }
    if (wmPtr->hints.flags & IconMaskHint) {
      Tk_FreeBitmap(winPtr->display, wmPtr->hints.icon_mask);
    }
    if (wmPtr->leaderName != NULL) {
      ckfree(wmPtr->leaderName);
    }
    if (wmPtr->icon != NULL) {
      wmPtr2 = ((TkWindow *) wmPtr->icon)->wmInfoPtr;
      wmPtr2->iconFor = NULL;
      wmPtr2->withdrawn = 1;
    }
    if (wmPtr->iconFor != NULL) {
      wmPtr2 = ((TkWindow *) wmPtr->iconFor)->wmInfoPtr;
      wmPtr2->icon = NULL;
      wmPtr2->hints.flags &= ~IconWindowHint;
      UpdateHints((TkWindow *) wmPtr->iconFor);
    }
    if (wmPtr->menubar != NULL) {
      Tk_DestroyWindow(wmPtr->menubar);
    }
    if (wmPtr->wrapperPtr != NULL) {
      /*
       * The rest of Tk doesn't know that we reparent the toplevel
       * inside the wrapper, so reparent it back out again before
       * deleting the wrapper; otherwise the toplevel will get deleted
       * twice (once implicitly by the deletion of the wrapper).
       */

      XUnmapWindow(winPtr->display, winPtr->window);
      XReparentWindow(winPtr->display, winPtr->window,
            XRootWindow(winPtr->display, winPtr->screenNum), 0, 0);
      Tk_DestroyWindow((Tk_Window) wmPtr->wrapperPtr);
    }
    while (wmPtr->protPtr != NULL) {
      ProtocolHandler *protPtr;

      protPtr = wmPtr->protPtr;
      wmPtr->protPtr = protPtr->nextPtr;
      Tcl_EventuallyFree((ClientData) protPtr, TCL_DYNAMIC);
    }
    if (wmPtr->cmdArgv != NULL) {
      ckfree((char *) wmPtr->cmdArgv);
    }
    if (wmPtr->clientMachine != NULL) {
      ckfree((char *) wmPtr->clientMachine);
    }
    if (wmPtr->flags & WM_UPDATE_PENDING) {
      Tcl_CancelIdleCall(UpdateGeometryInfo, (ClientData) winPtr);
    }
    /*
     * Reset all transient windows whose master is the dead window.
     */

    for (wmPtr2 = winPtr->dispPtr->firstWmPtr; wmPtr2 != NULL;
       wmPtr2 = wmPtr2->nextPtr) {
      if (wmPtr2->masterPtr == winPtr) {
          wmPtr->numTransients--;
          Tk_DeleteEventHandler((Tk_Window) wmPtr2->masterPtr,
                  StructureNotifyMask,
                  WmWaitMapProc, (ClientData) wmPtr2->winPtr);
          wmPtr2->masterPtr = NULL;
          if (!(wmPtr2->flags & WM_NEVER_MAPPED)) {
            XSetTransientForHint(wmPtr2->winPtr->display,
                    wmPtr2->wrapperPtr->window, None);
            /* FIXME: Need a call like Win32's UpdateWrapper() so
               we can recreate the wrapper and get rid of the
               transient window decorations. */
          }
      }
    }
    if (wmPtr->numTransients != 0)
        panic("numTransients should be 0");

    if (wmPtr->masterPtr != NULL) {
      wmPtr2 = wmPtr->masterPtr->wmInfoPtr;
      /*
       * If we had a master, tell them that we aren't tied
       * to them anymore
       */
      if (wmPtr2 != NULL) {
          wmPtr2->numTransients--;
      }
      Tk_DeleteEventHandler((Tk_Window) wmPtr->masterPtr,
            StructureNotifyMask,
            WmWaitMapProc, (ClientData) winPtr);
      wmPtr->masterPtr = NULL;
    }
    ckfree((char *) wmPtr);
    winPtr->wmInfoPtr = NULL;
}

/*
 *--------------------------------------------------------------
 *
 * TkWmSetClass --
 *
 *    This procedure is invoked whenever a top-level window's
 *    class is changed.  If the window has been mapped then this
 *    procedure updates the window manager property for the
 *    class.  If the window hasn't been mapped, the update is
 *    deferred until just before the first mapping.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    A window property may get updated.
 *
 *--------------------------------------------------------------
 */

void
TkWmSetClass(winPtr)
    TkWindow *winPtr;         /* Newly-created top-level window. */
{
    if (winPtr->wmInfoPtr->flags & WM_NEVER_MAPPED) {
      return;
    }

    if (winPtr->classUid != NULL) {
      XClassHint *classPtr;
      Tcl_DString name, class;

      Tcl_UtfToExternalDString(NULL, winPtr->nameUid, -1, &name);
      Tcl_UtfToExternalDString(NULL, winPtr->classUid, -1, &class);
      classPtr = XAllocClassHint();
      classPtr->res_name = Tcl_DStringValue(&name);
      classPtr->res_class = Tcl_DStringValue(&class);
      XSetClassHint(winPtr->display, winPtr->wmInfoPtr->wrapperPtr->window,
            classPtr);
      XFree((char *) classPtr);
      Tcl_DStringFree(&name);
      Tcl_DStringFree(&class);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_WmObjCmd --
 *
 *    This procedure is invoked to process the "wm" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

      /* ARGSUSED */
int
Tk_WmObjCmd(clientData, interp, objc, objv)
    ClientData clientData;    /* Main window associated with
                         * interpreter. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    Tk_Window tkwin = (Tk_Window) clientData;
    static CONST char *optionStrings[] = {
      "aspect", "attributes", "client", "colormapwindows",
      "command", "deiconify", "focusmodel", "frame",
      "geometry", "grid", "group", "iconbitmap",
      "iconify", "iconmask", "iconname", "iconposition",
      "iconwindow", "maxsize", "minsize", "overrideredirect",
        "positionfrom", "protocol", "resizable", "sizefrom",
        "stackorder", "state", "title", "transient",
      "withdraw", (char *) NULL };
    enum options {
        WMOPT_ASPECT, WMOPT_ATTRIBUTES, WMOPT_CLIENT, WMOPT_COLORMAPWINDOWS,
      WMOPT_COMMAND, WMOPT_DEICONIFY, WMOPT_FOCUSMODEL, WMOPT_FRAME,
      WMOPT_GEOMETRY, WMOPT_GRID, WMOPT_GROUP, WMOPT_ICONBITMAP,
      WMOPT_ICONIFY, WMOPT_ICONMASK, WMOPT_ICONNAME, WMOPT_ICONPOSITION,
      WMOPT_ICONWINDOW, WMOPT_MAXSIZE, WMOPT_MINSIZE, WMOPT_OVERRIDEREDIRECT,
        WMOPT_POSITIONFROM, WMOPT_PROTOCOL, WMOPT_RESIZABLE, WMOPT_SIZEFROM,
        WMOPT_STACKORDER, WMOPT_STATE, WMOPT_TITLE, WMOPT_TRANSIENT,
      WMOPT_WITHDRAW };
    int index; 
    int length;
    char *argv1;
    TkWindow *winPtr;
    TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr;

    if (objc < 2) {
      wrongNumArgs:
      Tcl_WrongNumArgs(interp, 1, objv, "option window ?arg ...?");
      return TCL_ERROR;
    }

    argv1 = Tcl_GetStringFromObj(objv[1], &length);
    if ((argv1[0] == 't') && (strncmp(argv1, "tracing", (size_t) length) == 0)
          && (length >= 3)) {
      int wmTracing;
      if ((objc != 2) && (objc != 3)) {
          Tcl_WrongNumArgs(interp, 2, objv, "?boolean?");
          return TCL_ERROR;
      }
      if (objc == 2) {
          Tcl_SetResult(interp,
                ((dispPtr->flags & TK_DISPLAY_WM_TRACING) ? "on" : "off"),
                TCL_STATIC);
          return TCL_OK;
      }
      if (Tcl_GetBooleanFromObj(interp, objv[2], &wmTracing) != TCL_OK) {
          return TCL_ERROR;
      }
      if (wmTracing) {
          dispPtr->flags |= TK_DISPLAY_WM_TRACING;
      } else {
          dispPtr->flags &= ~TK_DISPLAY_WM_TRACING;
      }
      return TCL_OK;
    }

    if (Tcl_GetIndexFromObj(interp, objv[1], optionStrings, "option", 0,
          &index) != TCL_OK) {
      return TCL_ERROR;
    }

    if (objc < 3) {
      goto wrongNumArgs;
    }

    if (TkGetWindowFromObj(interp, tkwin, objv[2], (Tk_Window *) &winPtr)
          != TCL_OK) {
      return TCL_ERROR;
    }
    if (!Tk_IsTopLevel(winPtr)) {
      Tcl_AppendResult(interp, "window \"", winPtr->pathName,
            "\" isn't a top-level window", (char *) NULL);
      return TCL_ERROR;
    }

    switch ((enum options) index) {
      case WMOPT_ASPECT:
      return WmAspectCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_ATTRIBUTES:
      return WmAttributesCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_CLIENT:
      return WmClientCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_COLORMAPWINDOWS:
      return WmColormapwindowsCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_COMMAND:
      return WmCommandCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_DEICONIFY:
      return WmDeiconifyCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_FOCUSMODEL:
      return WmFocusmodelCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_FRAME:
      return WmFrameCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_GEOMETRY:
      return WmGeometryCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_GRID:
      return WmGridCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_GROUP:
      return WmGroupCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_ICONBITMAP:
      return WmIconbitmapCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_ICONIFY:
      return WmIconifyCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_ICONMASK:
      return WmIconmaskCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_ICONNAME:
      return WmIconnameCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_ICONPOSITION:
      return WmIconpositionCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_ICONWINDOW:
      return WmIconwindowCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_MAXSIZE:
      return WmMaxsizeCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_MINSIZE:
      return WmMinsizeCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_OVERRIDEREDIRECT:
      return WmOverrideredirectCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_POSITIONFROM:
      return WmPositionfromCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_PROTOCOL:
      return WmProtocolCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_RESIZABLE:
      return WmResizableCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_SIZEFROM:
      return WmSizefromCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_STACKORDER:
      return WmStackorderCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_STATE:
      return WmStateCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_TITLE:
      return WmTitleCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_TRANSIENT:
      return WmTransientCmd(tkwin, winPtr, interp, objc, objv);
      case WMOPT_WITHDRAW:
      return WmWithdrawCmd(tkwin, winPtr, interp, objc, objv);
    }

    /* This should not happen */
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * WmAspectCmd --
 *
 *    This procedure is invoked to process the "wm aspect" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmAspectCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    int numer1, denom1, numer2, denom2;

    if ((objc != 3) && (objc != 7)) {
      Tcl_WrongNumArgs(interp, 2, objv,
            "window ?minNumer minDenom maxNumer maxDenom?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      if (wmPtr->sizeHintsFlags & PAspect) {
          char buf[TCL_INTEGER_SPACE * 4];

          sprintf(buf, "%d %d %d %d", wmPtr->minAspect.x,
                wmPtr->minAspect.y, wmPtr->maxAspect.x,
                wmPtr->maxAspect.y);
          Tcl_SetResult(interp, buf, TCL_VOLATILE);
      }
      return TCL_OK;
    }
    if (*Tcl_GetString(objv[3]) == '\0') {
      wmPtr->sizeHintsFlags &= ~PAspect;
    } else {
      if ((Tcl_GetIntFromObj(interp, objv[3], &numer1) != TCL_OK)
            || (Tcl_GetIntFromObj(interp, objv[4], &denom1) != TCL_OK)
            || (Tcl_GetIntFromObj(interp, objv[5], &numer2) != TCL_OK)
            || (Tcl_GetIntFromObj(interp, objv[6], &denom2) != TCL_OK)) {
          return TCL_ERROR;
      }
      if ((numer1 <= 0) || (denom1 <= 0) || (numer2 <= 0) ||
            (denom2 <= 0)) {
          Tcl_SetResult(interp, "aspect number can't be <= 0",
                TCL_STATIC);
          return TCL_ERROR;
      }
      wmPtr->minAspect.x = numer1;
      wmPtr->minAspect.y = denom1;
      wmPtr->maxAspect.x = numer2;
      wmPtr->maxAspect.y = denom2;
      wmPtr->sizeHintsFlags |= PAspect;
    }
    wmPtr->flags |= WM_UPDATE_SIZE_HINTS;
    WmUpdateGeom(wmPtr, winPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmAttributesCmd --
 *
 *    This procedure is invoked to process the "wm attributes" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmAttributesCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    if (objc != 3) {
      Tcl_WrongNumArgs(interp, 2, objv, "window");
      return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmClientCmd --
 *
 *    This procedure is invoked to process the "wm client" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmClientCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    char *argv3;
    int length;

    if ((objc != 3) && (objc != 4)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?name?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      if (wmPtr->clientMachine != NULL) {
          Tcl_SetResult(interp, wmPtr->clientMachine, TCL_STATIC);
      }
      return TCL_OK;
    }
    argv3 = Tcl_GetStringFromObj(objv[3], &length);
    if (argv3[0] == 0) {
      if (wmPtr->clientMachine != NULL) {
          ckfree((char *) wmPtr->clientMachine);
          wmPtr->clientMachine = NULL;
          if (!(wmPtr->flags & WM_NEVER_MAPPED)) {
            XDeleteProperty(winPtr->display, wmPtr->wrapperPtr->window,
                  Tk_InternAtom((Tk_Window) winPtr,
                        "WM_CLIENT_MACHINE"));
          }
      }
      return TCL_OK;
    }
    if (wmPtr->clientMachine != NULL) {
      ckfree((char *) wmPtr->clientMachine);
    }
    wmPtr->clientMachine = (char *)
          ckalloc((unsigned) (length + 1));
    strcpy(wmPtr->clientMachine, argv3);
    if (!(wmPtr->flags & WM_NEVER_MAPPED)) {
      XTextProperty textProp;
      Tcl_DString ds;

      Tcl_UtfToExternalDString(NULL, wmPtr->clientMachine, -1, &ds);
      if (XStringListToTextProperty(&(Tcl_DStringValue(&ds)), 1,
            &textProp) != 0) {
          XSetWMClientMachine(winPtr->display, wmPtr->wrapperPtr->window,
                &textProp);
          XFree((char *) textProp.value);
      }
      Tcl_DStringFree(&ds);
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmColormapwindowsCmd --
 *
 *    This procedure is invoked to process the "wm colormapwindows"
 *    Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmColormapwindowsCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    Window *cmapList;
    TkWindow *winPtr2;
    int count, i, windowObjc, gotToplevel;
    Tcl_Obj **windowObjv;
    char buffer[20];

    if ((objc != 3) && (objc != 4)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?windowList?");
      return TCL_ERROR;
    }
    Tk_MakeWindowExist((Tk_Window) winPtr);
    if (wmPtr->wrapperPtr == NULL) {
      CreateWrapper(wmPtr);
    }
    if (objc == 3) {
      if (XGetWMColormapWindows(winPtr->display,
            wmPtr->wrapperPtr->window, &cmapList, &count) == 0) {
          return TCL_OK;
      }
      for (i = 0; i < count; i++) {
          if ((i == (count-1))
                && (wmPtr->flags & WM_ADDED_TOPLEVEL_COLORMAP)) {
            break;
          }
          winPtr2  = (TkWindow *) Tk_IdToWindow(winPtr->display,
                cmapList[i]);
          if (winPtr2 == NULL) {
            sprintf(buffer, "0x%lx", cmapList[i]);
            Tcl_AppendElement(interp, buffer);
          } else {
            Tcl_AppendElement(interp, winPtr2->pathName);
          }
      }
      XFree((char *) cmapList);
      return TCL_OK;
    }
    if (Tcl_ListObjGetElements(interp, objv[3], &windowObjc, &windowObjv)
          != TCL_OK) {
      return TCL_ERROR;
    }
    cmapList = (Window *) ckalloc((unsigned)
          ((windowObjc+1)*sizeof(Window)));
    gotToplevel = 0;
    for (i = 0; i < windowObjc; i++) {
      if (TkGetWindowFromObj(interp, tkwin, windowObjv[i],
            (Tk_Window *) &winPtr2) != TCL_OK)
      {
          ckfree((char *) cmapList);
          return TCL_ERROR;
      }
      if (winPtr2 == winPtr) {
          gotToplevel = 1;
      }
      if (winPtr2->window == None) {
          Tk_MakeWindowExist((Tk_Window) winPtr2);
      }
      cmapList[i] = winPtr2->window;
    }
    if (!gotToplevel) {
      wmPtr->flags |= WM_ADDED_TOPLEVEL_COLORMAP;
      cmapList[windowObjc] = wmPtr->wrapperPtr->window;
      windowObjc++;
    } else {
      wmPtr->flags &= ~WM_ADDED_TOPLEVEL_COLORMAP;
    }
    wmPtr->flags |= WM_COLORMAPS_EXPLICIT;
    XSetWMColormapWindows(winPtr->display, wmPtr->wrapperPtr->window,
          cmapList, windowObjc);
    ckfree((char *) cmapList);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmCommandCmd --
 *
 *    This procedure is invoked to process the "wm command" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmCommandCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    char *argv3;
    int cmdArgc;
    CONST char **cmdArgv;

    if ((objc != 3) && (objc != 4)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?value?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      if (wmPtr->cmdArgv != NULL) {
          Tcl_SetResult(interp,
                Tcl_Merge(wmPtr->cmdArgc, wmPtr->cmdArgv),
                TCL_DYNAMIC);
      }
      return TCL_OK;
    }
    argv3 = Tcl_GetString(objv[3]);
    if (argv3[0] == 0) {
      if (wmPtr->cmdArgv != NULL) {
          ckfree((char *) wmPtr->cmdArgv);
          wmPtr->cmdArgv = NULL;
          if (!(wmPtr->flags & WM_NEVER_MAPPED)) {
            XDeleteProperty(winPtr->display, wmPtr->wrapperPtr->window,
                  Tk_InternAtom((Tk_Window) winPtr, "WM_COMMAND"));
          }
      }
      return TCL_OK;
    }
    if (Tcl_SplitList(interp, argv3, &cmdArgc, &cmdArgv) != TCL_OK) {
      return TCL_ERROR;
    }
    if (wmPtr->cmdArgv != NULL) {
      ckfree((char *) wmPtr->cmdArgv);
    }
    wmPtr->cmdArgc = cmdArgc;
    wmPtr->cmdArgv = cmdArgv;
    if (!(wmPtr->flags & WM_NEVER_MAPPED)) {
      UpdateCommand(winPtr);
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmDeiconifyCmd --
 *
 *    This procedure is invoked to process the "wm deiconify" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmDeiconifyCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;

    if (objc != 3) {
      Tcl_WrongNumArgs(interp, 2, objv, "window");
      return TCL_ERROR;
    }
    if (wmPtr->iconFor != NULL) {
      Tcl_AppendResult(interp, "can't deiconify ", Tcl_GetString(objv[2]),
            ": it is an icon for ", Tk_PathName(wmPtr->iconFor),
            (char *) NULL);
      return TCL_ERROR;
    }
    if (winPtr->flags & TK_EMBEDDED) {
      Tcl_AppendResult(interp, "can't deiconify ", winPtr->pathName,
            ": it is an embedded window", (char *) NULL);
      return TCL_ERROR;
    }
    wmPtr->flags &= ~WM_WITHDRAWN;
    TkpWmSetState(winPtr, NormalState);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmFocusmodelCmd --
 *
 *    This procedure is invoked to process the "wm focusmodel" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmFocusmodelCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    static CONST char *optionStrings[] = {
      "active", "passive", (char *) NULL };
    enum options {
      OPT_ACTIVE, OPT_PASSIVE };
    int index;

    if ((objc != 3) && (objc != 4)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?active|passive?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      Tcl_SetResult(interp, (wmPtr->hints.input ? "passive" : "active"),
            TCL_STATIC);
      return TCL_OK;
    }

    if (Tcl_GetIndexFromObj(interp, objv[3], optionStrings, "argument", 0,
          &index) != TCL_OK) {
      return TCL_ERROR;
    }
    if (index == OPT_ACTIVE) {
      wmPtr->hints.input = False;
    } else { /* OPT_PASSIVE */
      wmPtr->hints.input = True;
    }
    UpdateHints(winPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmFrameCmd --
 *
 *    This procedure is invoked to process the "wm frame" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmFrameCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    Window window;
    char buf[TCL_INTEGER_SPACE];

    if (objc != 3) {
      Tcl_WrongNumArgs(interp, 2, objv, "window");
      return TCL_ERROR;
    }
    window = wmPtr->reparent;
    if (window == None) {
      window = Tk_WindowId((Tk_Window) winPtr);
    }
    sprintf(buf, "0x%x", (unsigned int) window);
    Tcl_SetResult(interp, buf, TCL_VOLATILE);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmGeometryCmd --
 *
 *    This procedure is invoked to process the "wm geometry" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmGeometryCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    char xSign, ySign;
    int width, height;
    char *argv3;

    if ((objc != 3) && (objc != 4)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?newGeometry?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      char buf[16 + TCL_INTEGER_SPACE * 4];

      xSign = (wmPtr->flags & WM_NEGATIVE_X) ? '-' : '+';
      ySign = (wmPtr->flags & WM_NEGATIVE_Y) ? '-' : '+';
      if (wmPtr->gridWin != NULL) {
          width = wmPtr->reqGridWidth + (winPtr->changes.width
                - winPtr->reqWidth)/wmPtr->widthInc;
          height = wmPtr->reqGridHeight + (winPtr->changes.height
                - winPtr->reqHeight)/wmPtr->heightInc;
      } else {
          width = winPtr->changes.width;
          height = winPtr->changes.height;
      }
      sprintf(buf, "%dx%d%c%d%c%d", width, height, xSign, wmPtr->x,
            ySign, wmPtr->y);
      Tcl_SetResult(interp, buf, TCL_VOLATILE);
      return TCL_OK;
    }
    argv3 = Tcl_GetString(objv[3]);
    if (*argv3 == '\0') {
      wmPtr->width = -1;
      wmPtr->height = -1;
      WmUpdateGeom(wmPtr, winPtr);
      return TCL_OK;
    }
    return ParseGeometry(interp, argv3, winPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * WmGridCmd --
 *
 *    This procedure is invoked to process the "wm grid" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmGridCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    int reqWidth, reqHeight, widthInc, heightInc;

    if ((objc != 3) && (objc != 7)) {
      Tcl_WrongNumArgs(interp, 2, objv,
            "window ?baseWidth baseHeight widthInc heightInc?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      if (wmPtr->sizeHintsFlags & PBaseSize) {
          char buf[TCL_INTEGER_SPACE * 4];

          sprintf(buf, "%d %d %d %d", wmPtr->reqGridWidth,
                wmPtr->reqGridHeight, wmPtr->widthInc,
                wmPtr->heightInc);
          Tcl_SetResult(interp, buf, TCL_VOLATILE);
      }
      return TCL_OK;
    }
    if (*Tcl_GetString(objv[3]) == '\0') {
      /*
       * Turn off gridding and reset the width and height
       * to make sense as ungridded numbers.
       */

      wmPtr->sizeHintsFlags &= ~(PBaseSize|PResizeInc);
      if (wmPtr->width != -1) {
          wmPtr->width = winPtr->reqWidth + (wmPtr->width
                - wmPtr->reqGridWidth)*wmPtr->widthInc;
          wmPtr->height = winPtr->reqHeight + (wmPtr->height
                - wmPtr->reqGridHeight)*wmPtr->heightInc;
      }
      wmPtr->widthInc = 1;
      wmPtr->heightInc = 1;
    } else {
      if ((Tcl_GetIntFromObj(interp, objv[3], &reqWidth) != TCL_OK)
            || (Tcl_GetIntFromObj(interp, objv[4], &reqHeight) != TCL_OK)
            || (Tcl_GetIntFromObj(interp, objv[5], &widthInc) != TCL_OK)
            || (Tcl_GetIntFromObj(interp, objv[6], &heightInc) != TCL_OK)) {
          return TCL_ERROR;
      }
      if (reqWidth < 0) {
          Tcl_SetResult(interp, "baseWidth can't be < 0", TCL_STATIC);
          return TCL_ERROR;
      }
      if (reqHeight < 0) {
          Tcl_SetResult(interp, "baseHeight can't be < 0", TCL_STATIC);
          return TCL_ERROR;
      }
      if (widthInc < 0) {
          Tcl_SetResult(interp, "widthInc can't be < 0", TCL_STATIC);
          return TCL_ERROR;
      }
      if (heightInc < 0) {
          Tcl_SetResult(interp, "heightInc can't be < 0", TCL_STATIC);
          return TCL_ERROR;
      }
      Tk_SetGrid((Tk_Window) winPtr, reqWidth, reqHeight, widthInc,
            heightInc);
    }
    wmPtr->flags |= WM_UPDATE_SIZE_HINTS;
    WmUpdateGeom(wmPtr, winPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmGroupCmd --
 *
 *    This procedure is invoked to process the "wm group" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmGroupCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    Tk_Window tkwin2;
    WmInfo *wmPtr2;
    char *argv3;
    int length;

    if ((objc != 3) && (objc != 4)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?pathName?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      if (wmPtr->hints.flags & WindowGroupHint) {
          Tcl_SetResult(interp, wmPtr->leaderName, TCL_STATIC);
      }
      return TCL_OK;
    }
    argv3 = Tcl_GetStringFromObj(objv[3], &length);
    if (*argv3 == '\0') {
      wmPtr->hints.flags &= ~WindowGroupHint;
      if (wmPtr->leaderName != NULL) {
          ckfree(wmPtr->leaderName);
      }
      wmPtr->leaderName = NULL;
    } else {
      if (TkGetWindowFromObj(interp, tkwin, objv[3], &tkwin2) != TCL_OK) {
          return TCL_ERROR;
      }
      while (!Tk_TopWinHierarchy(tkwin2)) {
          /*
           * Ensure that the group leader is actually a Tk toplevel.
           */

          tkwin2 = Tk_Parent(tkwin2);
      }
      Tk_MakeWindowExist(tkwin2);
      wmPtr2 = ((TkWindow *) tkwin2)->wmInfoPtr;
      if (wmPtr2->wrapperPtr == NULL) {
          CreateWrapper(wmPtr2);
      }
      if (wmPtr->leaderName != NULL) {
          ckfree(wmPtr->leaderName);
      }
      wmPtr->hints.window_group = Tk_WindowId(wmPtr2->wrapperPtr);
      wmPtr->hints.flags |= WindowGroupHint;
      wmPtr->leaderName = ckalloc((unsigned) (length + 1));
      strcpy(wmPtr->leaderName, argv3);
    }
    UpdateHints(winPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmIconbitmapCmd --
 *
 *    This procedure is invoked to process the "wm iconbitmap" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmIconbitmapCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    Pixmap pixmap;
    char *argv3;

    if ((objc < 3) || (objc > 4)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?bitmap?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      if (wmPtr->hints.flags & IconPixmapHint) {
          Tcl_SetResult(interp, (char *)
                Tk_NameOfBitmap(winPtr->display, wmPtr->hints.icon_pixmap),
                TCL_STATIC);
      }
      return TCL_OK;
    }
    argv3 = Tcl_GetString(objv[3]);
    if (*argv3 == '\0') {
      if (wmPtr->hints.icon_pixmap != None) {
          Tk_FreeBitmap(winPtr->display, wmPtr->hints.icon_pixmap);
          wmPtr->hints.icon_pixmap = None;
      }
      wmPtr->hints.flags &= ~IconPixmapHint;
    } else {
      pixmap = Tk_GetBitmap(interp, (Tk_Window) winPtr, argv3);
      if (pixmap == None) {
          return TCL_ERROR;
      }
      wmPtr->hints.icon_pixmap = pixmap;
      wmPtr->hints.flags |= IconPixmapHint;
    }
    UpdateHints(winPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmIconifyCmd --
 *
 *    This procedure is invoked to process the "wm iconify" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmIconifyCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    if (objc != 3) {
      Tcl_WrongNumArgs(interp, 2, objv, "window");
      return TCL_ERROR;
    }
    if (Tk_Attributes((Tk_Window) winPtr)->override_redirect) {
      Tcl_AppendResult(interp, "can't iconify \"", winPtr->pathName,
            "\": override-redirect flag is set", (char *) NULL);
      return TCL_ERROR;
    }
    if (wmPtr->masterPtr != NULL) {
      Tcl_AppendResult(interp, "can't iconify \"", winPtr->pathName,
            "\": it is a transient", (char *) NULL);
      return TCL_ERROR;
    }
    if (wmPtr->iconFor != NULL) {
      Tcl_AppendResult(interp, "can't iconify ", winPtr->pathName,
            ": it is an icon for ", Tk_PathName(wmPtr->iconFor),
            (char *) NULL);
      return TCL_ERROR;
    }
    if (winPtr->flags & TK_EMBEDDED) {
      Tcl_AppendResult(interp, "can't iconify ", winPtr->pathName,
            ": it is an embedded window", (char *) NULL);
      return TCL_ERROR;
    }
    if (TkpWmSetState(winPtr, IconicState) == 0) {
      Tcl_SetResult(interp,
            "couldn't send iconify message to window manager",
            TCL_STATIC);
      return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmIconmaskCmd --
 *
 *    This procedure is invoked to process the "wm iconmask" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmIconmaskCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    Pixmap pixmap;
    char *argv3;

    if ((objc != 3) && (objc != 4)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?bitmap?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      if (wmPtr->hints.flags & IconMaskHint) {
          Tcl_SetResult(interp, (char *)
                Tk_NameOfBitmap(winPtr->display, wmPtr->hints.icon_mask),
                TCL_STATIC);
      }
      return TCL_OK;
    }
    argv3 = Tcl_GetString(objv[3]);
    if (*argv3 == '\0') {
      if (wmPtr->hints.icon_mask != None) {
          Tk_FreeBitmap(winPtr->display, wmPtr->hints.icon_mask);
      }
      wmPtr->hints.flags &= ~IconMaskHint;
    } else {
      pixmap = Tk_GetBitmap(interp, tkwin, argv3);
      if (pixmap == None) {
          return TCL_ERROR;
      }
      wmPtr->hints.icon_mask = pixmap;
      wmPtr->hints.flags |= IconMaskHint;
    }
    UpdateHints(winPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmIconnameCmd --
 *
 *    This procedure is invoked to process the "wm iconname" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmIconnameCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    char *argv3;
    int length;

    if (objc > 4) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?newName?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      Tcl_SetResult(interp,
            ((wmPtr->iconName != NULL) ? wmPtr->iconName : ""),
            TCL_STATIC);
      return TCL_OK;
    } else {
      if (wmPtr->iconName != NULL) {
          ckfree((char *) wmPtr->iconName);
      }
      argv3 = Tcl_GetStringFromObj(objv[3], &length);
      wmPtr->iconName = ckalloc((unsigned) (length + 1));
      strcpy(wmPtr->iconName, argv3);
      if (!(wmPtr->flags & WM_NEVER_MAPPED)) {
          Tcl_DString ds;

          Tcl_UtfToExternalDString(NULL, wmPtr->iconName, -1, &ds);
          XSetIconName(winPtr->display, wmPtr->wrapperPtr->window,
                Tcl_DStringValue(&ds));
          Tcl_DStringFree(&ds);
      }
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmIconpositionCmd --
 *
 *    This procedure is invoked to process the "wm iconposition"
 *    Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmIconpositionCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    int x, y;

    if ((objc != 3) && (objc != 5)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?x y?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      if (wmPtr->hints.flags & IconPositionHint) {
          char buf[TCL_INTEGER_SPACE * 2];

          sprintf(buf, "%d %d", wmPtr->hints.icon_x,
                wmPtr->hints.icon_y);
          Tcl_SetResult(interp, buf, TCL_VOLATILE);
      }
      return TCL_OK;
    }
    if (*Tcl_GetString(objv[3]) == '\0') {
      wmPtr->hints.flags &= ~IconPositionHint;
    } else {
      if ((Tcl_GetIntFromObj(interp, objv[3], &x) != TCL_OK)
            || (Tcl_GetIntFromObj(interp, objv[4], &y) != TCL_OK)){
          return TCL_ERROR;
      }
      wmPtr->hints.icon_x = x;
      wmPtr->hints.icon_y = y;
      wmPtr->hints.flags |= IconPositionHint;
    }
    UpdateHints(winPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmIconwindowCmd --
 *
 *    This procedure is invoked to process the "wm iconwindow" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmIconwindowCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    Tk_Window tkwin2;
    WmInfo *wmPtr2;
    XSetWindowAttributes atts;

    if ((objc != 3) && (objc != 4)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?pathName?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      if (wmPtr->icon != NULL) {
          Tcl_SetResult(interp, Tk_PathName(wmPtr->icon), TCL_STATIC);
      }
      return TCL_OK;
    }
    if (*Tcl_GetString(objv[3]) == '\0') {
      wmPtr->hints.flags &= ~IconWindowHint;
      if (wmPtr->icon != NULL) {
          /*
           * Remove the icon window relationship.  In principle we
           * should also re-enable button events for the window, but
           * this doesn't work in general because the window manager
           * is probably selecting on them (we'll get an error if
           * we try to re-enable the events).  So, just leave the
           * icon window event-challenged;  the user will have to
           * recreate it if they want button events.
           */

          wmPtr2 = ((TkWindow *) wmPtr->icon)->wmInfoPtr;
          wmPtr2->iconFor = NULL;
          wmPtr2->withdrawn = 1;
          wmPtr2->hints.initial_state = WithdrawnState;
      }
      wmPtr->icon = NULL;
    } else {
      if (TkGetWindowFromObj(interp, tkwin, objv[3], &tkwin2) != TCL_OK) {
          return TCL_ERROR;
      }
      if (!Tk_IsTopLevel(tkwin2)) {
          Tcl_AppendResult(interp, "can't use ", Tcl_GetString(objv[3]),
                " as icon window: not at top level", (char *) NULL);
          return TCL_ERROR;
      }
      wmPtr2 = ((TkWindow *) tkwin2)->wmInfoPtr;
      if (wmPtr2->iconFor != NULL) {
          Tcl_AppendResult(interp, Tcl_GetString(objv[3]),
                " is already an icon for ",
                Tk_PathName(wmPtr2->iconFor), (char *) NULL);
          return TCL_ERROR;
      }
      if (wmPtr->icon != NULL) {
          WmInfo *wmPtr3 = ((TkWindow *) wmPtr->icon)->wmInfoPtr;
          wmPtr3->iconFor = NULL;
          wmPtr3->withdrawn = 1;
          wmPtr3->hints.initial_state = WithdrawnState;
      }

      /*
       * Disable button events in the icon window:  some window
       * managers (like olvwm) want to get the events themselves,
       * but X only allows one application at a time to receive
       * button events for a window.
       */

      atts.event_mask = Tk_Attributes(tkwin2)->event_mask
            & ~ButtonPressMask;
      Tk_ChangeWindowAttributes(tkwin2, CWEventMask, &atts);
      Tk_MakeWindowExist(tkwin2);
      if (wmPtr2->wrapperPtr == NULL) {
          CreateWrapper(wmPtr2);
      }
      wmPtr->hints.icon_window = Tk_WindowId(wmPtr2->wrapperPtr);
      wmPtr->hints.flags |= IconWindowHint;
      wmPtr->icon = tkwin2;
      wmPtr2->iconFor = (Tk_Window) winPtr;
      if (!wmPtr2->withdrawn && !(wmPtr2->flags & WM_NEVER_MAPPED)) {
          wmPtr2->withdrawn = 0;
          if (XWithdrawWindow(Tk_Display(tkwin2),
                Tk_WindowId(wmPtr2->wrapperPtr),
                Tk_ScreenNumber(tkwin2)) == 0) {
            Tcl_SetResult(interp,
                  "couldn't send withdraw message to window manager",
                  TCL_STATIC);
            return TCL_ERROR;
          }
          WaitForMapNotify((TkWindow *) tkwin2, 0);
      }
    }
    UpdateHints(winPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmMaxsizeCmd --
 *
 *    This procedure is invoked to process the "wm maxsize" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmMaxsizeCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    int width, height;

    if ((objc != 3) && (objc != 5)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?width height?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      char buf[TCL_INTEGER_SPACE * 2];

      GetMaxSize(wmPtr, &width, &height);
      sprintf(buf, "%d %d", width, height);
      Tcl_SetResult(interp, buf, TCL_VOLATILE);
      return TCL_OK;
    }
    if ((Tcl_GetIntFromObj(interp, objv[3], &width) != TCL_OK)
          || (Tcl_GetIntFromObj(interp, objv[4], &height) != TCL_OK)) {
      return TCL_ERROR;
    }
    wmPtr->maxWidth = width;
    wmPtr->maxHeight = height;
    wmPtr->flags |= WM_UPDATE_SIZE_HINTS;
    WmUpdateGeom(wmPtr, winPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmMinsizeCmd --
 *
 *    This procedure is invoked to process the "wm minsize" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmMinsizeCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    int width, height;

    if ((objc != 3) && (objc != 5)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?width height?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      char buf[TCL_INTEGER_SPACE * 2];

      sprintf(buf, "%d %d", wmPtr->minWidth, wmPtr->minHeight);
      Tcl_SetResult(interp, buf, TCL_VOLATILE);
      return TCL_OK;
    }
    if ((Tcl_GetIntFromObj(interp, objv[3], &width) != TCL_OK)
          || (Tcl_GetIntFromObj(interp, objv[4], &height) != TCL_OK)) {
      return TCL_ERROR;
    }
    wmPtr->minWidth = width;
    wmPtr->minHeight = height;
    wmPtr->flags |= WM_UPDATE_SIZE_HINTS;
    WmUpdateGeom(wmPtr, winPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmOverrideredirectCmd --
 *
 *    This procedure is invoked to process the "wm overrideredirect"
 *    Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmOverrideredirectCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    int boolean, curValue;
    XSetWindowAttributes atts;

    if ((objc != 3) && (objc != 4)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?boolean?");
      return TCL_ERROR;
    }
    curValue = Tk_Attributes((Tk_Window) winPtr)->override_redirect;
    if (objc == 3) {
      Tcl_SetBooleanObj(Tcl_GetObjResult(interp), curValue);
      return TCL_OK;
    }
    if (Tcl_GetBooleanFromObj(interp, objv[3], &boolean) != TCL_OK) {
      return TCL_ERROR;
    }
    if (curValue != boolean) {
      /*
       * Only do this if we are really changing value, because it
       * causes some funky stuff to occur
       */
      atts.override_redirect = (boolean) ? True : False;
      Tk_ChangeWindowAttributes((Tk_Window) winPtr, CWOverrideRedirect,
            &atts);
      if (winPtr->wmInfoPtr->wrapperPtr != NULL) {
          Tk_ChangeWindowAttributes(
                (Tk_Window) winPtr->wmInfoPtr->wrapperPtr,
                CWOverrideRedirect, &atts);
      }
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmPositionfromCmd --
 *
 *    This procedure is invoked to process the "wm positionfrom"
 *    Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmPositionfromCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    static CONST char *optionStrings[] = {
      "program", "user", (char *) NULL };
    enum options {
      OPT_PROGRAM, OPT_USER };
    int index;

    if ((objc != 3) && (objc != 4)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?user/program?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      if (wmPtr->sizeHintsFlags & USPosition) {
          Tcl_SetResult(interp, "user", TCL_STATIC);
      } else if (wmPtr->sizeHintsFlags & PPosition) {
          Tcl_SetResult(interp, "program", TCL_STATIC);
      }
      return TCL_OK;
    }
    if (*Tcl_GetString(objv[3]) == '\0') {
      wmPtr->sizeHintsFlags &= ~(USPosition|PPosition);
    } else {
      if (Tcl_GetIndexFromObj(interp, objv[3], optionStrings, "argument", 0,
            &index) != TCL_OK) {
          return TCL_ERROR;
      }
      if (index == OPT_USER) {
          wmPtr->sizeHintsFlags &= ~PPosition;
          wmPtr->sizeHintsFlags |= USPosition;
      } else {
          wmPtr->sizeHintsFlags &= ~USPosition;
          wmPtr->sizeHintsFlags |= PPosition;
      }
    }
    wmPtr->flags |= WM_UPDATE_SIZE_HINTS;
    WmUpdateGeom(wmPtr, winPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmProtocolCmd --
 *
 *    This procedure is invoked to process the "wm protocol" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmProtocolCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    register ProtocolHandler *protPtr, *prevPtr;
    Atom protocol;
    char *cmd;
    int cmdLength;

    if ((objc < 3) || (objc > 5)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?name? ?command?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      /*
       * Return a list of all defined protocols for the window.
       */
      for (protPtr = wmPtr->protPtr; protPtr != NULL;
           protPtr = protPtr->nextPtr) {
          Tcl_AppendElement(interp,
                Tk_GetAtomName((Tk_Window) winPtr, protPtr->protocol));
      }
      return TCL_OK;
    }
    protocol = Tk_InternAtom((Tk_Window) winPtr, Tcl_GetString(objv[3]));
    if (objc == 4) {
      /*
       * Return the command to handle a given protocol.
       */
      for (protPtr = wmPtr->protPtr; protPtr != NULL;
           protPtr = protPtr->nextPtr) {
          if (protPtr->protocol == protocol) {
            Tcl_SetResult(interp, protPtr->command, TCL_STATIC);
            return TCL_OK;
          }
      }
      return TCL_OK;
    }

    /*
     * Delete any current protocol handler, then create a new
     * one with the specified command, unless the command is
     * empty.
     */

    for (protPtr = wmPtr->protPtr, prevPtr = NULL; protPtr != NULL;
       prevPtr = protPtr, protPtr = protPtr->nextPtr) {
      if (protPtr->protocol == protocol) {
          if (prevPtr == NULL) {
            wmPtr->protPtr = protPtr->nextPtr;
          } else {
            prevPtr->nextPtr = protPtr->nextPtr;
          }
          Tcl_EventuallyFree((ClientData) protPtr, TCL_DYNAMIC);
          break;
      }
    }
    cmd = Tcl_GetStringFromObj(objv[4], &cmdLength);
    if (cmdLength > 0) {
      protPtr = (ProtocolHandler *) ckalloc(HANDLER_SIZE(cmdLength));
      protPtr->protocol = protocol;
      protPtr->nextPtr = wmPtr->protPtr;
      wmPtr->protPtr = protPtr;
      protPtr->interp = interp;
      strcpy(protPtr->command, cmd);
    }
    if (!(wmPtr->flags & WM_NEVER_MAPPED)) {
      UpdateWmProtocols(wmPtr);
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmResizableCmd --
 *
 *    This procedure is invoked to process the "wm resizable" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmResizableCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    int width, height;

    if ((objc != 3) && (objc != 5)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?width height?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      char buf[TCL_INTEGER_SPACE * 2];

      sprintf(buf, "%d %d",
            (wmPtr->flags  & WM_WIDTH_NOT_RESIZABLE) ? 0 : 1,
            (wmPtr->flags  & WM_HEIGHT_NOT_RESIZABLE) ? 0 : 1);
      Tcl_SetResult(interp, buf, TCL_VOLATILE);
      return TCL_OK;
    }
    if ((Tcl_GetBooleanFromObj(interp, objv[3], &width) != TCL_OK)
          || (Tcl_GetBooleanFromObj(interp, objv[4], &height) != TCL_OK)) {
      return TCL_ERROR;
    }
    if (width) {
      wmPtr->flags &= ~WM_WIDTH_NOT_RESIZABLE;
    } else {
      wmPtr->flags |= WM_WIDTH_NOT_RESIZABLE;
    }
    if (height) {
      wmPtr->flags &= ~WM_HEIGHT_NOT_RESIZABLE;
    } else {
      wmPtr->flags |= WM_HEIGHT_NOT_RESIZABLE;
    }
    wmPtr->flags |= WM_UPDATE_SIZE_HINTS;
    WmUpdateGeom(wmPtr, winPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmSizefromCmd --
 *
 *    This procedure is invoked to process the "wm sizefrom" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmSizefromCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    static CONST char *optionStrings[] = {
      "program", "user", (char *) NULL };
    enum options {
      OPT_PROGRAM, OPT_USER };
    int index;

    if ((objc != 3) && (objc != 4)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?user|program?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      if (wmPtr->sizeHintsFlags & USSize) {
          Tcl_SetResult(interp, "user", TCL_STATIC);
      } else if (wmPtr->sizeHintsFlags & PSize) {
          Tcl_SetResult(interp, "program", TCL_STATIC);
      }
      return TCL_OK;
    }

    if (*Tcl_GetString(objv[3]) == '\0') {
      wmPtr->sizeHintsFlags &= ~(USSize|PSize);
    } else {
      if (Tcl_GetIndexFromObj(interp, objv[3], optionStrings, "argument", 0,
            &index) != TCL_OK) {
          return TCL_ERROR;
      }
      if (index == OPT_USER) {
          wmPtr->sizeHintsFlags &= ~PSize;
          wmPtr->sizeHintsFlags |= USSize;
      } else { /* OPT_PROGRAM */
          wmPtr->sizeHintsFlags &= ~USSize;
          wmPtr->sizeHintsFlags |= PSize;
      }
    }
    wmPtr->flags |= WM_UPDATE_SIZE_HINTS;
    WmUpdateGeom(wmPtr, winPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmStackorderCmd --
 *
 *    This procedure is invoked to process the "wm stackorder" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmStackorderCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    TkWindow **windows, **window_ptr;
    static CONST char *optionStrings[] = {
      "isabove", "isbelow", (char *) NULL };
    enum options {
      OPT_ISABOVE, OPT_ISBELOW };
    int index;

    if ((objc != 3) && (objc != 5)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?isabove|isbelow window?");
      return TCL_ERROR;
    }

    if (objc == 3) {
      windows = TkWmStackorderToplevel(winPtr);
      if (windows == NULL) {
          panic("TkWmStackorderToplevel failed");
      } else {
          for (window_ptr = windows; *window_ptr ; window_ptr++) {
            Tcl_AppendElement(interp, (*window_ptr)->pathName);
          }
          ckfree((char *) windows);
          return TCL_OK;
      }
    } else {
      TkWindow *winPtr2;
      int index1=-1, index2=-1, result;

      if (TkGetWindowFromObj(interp, tkwin, objv[4], (Tk_Window *) &winPtr2)
            != TCL_OK) {
          return TCL_ERROR;
      }

      if (!Tk_IsTopLevel(winPtr2)) {
          Tcl_AppendResult(interp, "window \"", winPtr2->pathName,
                "\" isn't a top-level window", (char *) NULL);
          return TCL_ERROR;
      }

      if (!Tk_IsMapped(winPtr)) {
          Tcl_AppendResult(interp, "window \"", winPtr->pathName,
                "\" isn't mapped", (char *) NULL);
          return TCL_ERROR;
      }

      if (!Tk_IsMapped(winPtr2)) {
          Tcl_AppendResult(interp, "window \"", winPtr2->pathName,
                "\" isn't mapped", (char *) NULL);
          return TCL_ERROR;
      }

      /*
       * Lookup stacking order of all toplevels that are children
       * of "." and find the position of winPtr and winPtr2
       * in the stacking order.
       */

      windows = TkWmStackorderToplevel(winPtr->mainPtr->winPtr);

      if (windows == NULL) {
          Tcl_AppendResult(interp, "TkWmStackorderToplevel failed",
                    (char *) NULL);
          return TCL_ERROR;
      } else {
          for (window_ptr = windows; *window_ptr ; window_ptr++) {
            if (*window_ptr == winPtr)
                index1 = (window_ptr - windows);
            if (*window_ptr == winPtr2)
                index2 = (window_ptr - windows);
          }
          if (index1 == -1)
            panic("winPtr window not found");
          if (index2 == -1)
            panic("winPtr2 window not found");

          ckfree((char *) windows);
      }

      if (Tcl_GetIndexFromObj(interp, objv[3], optionStrings, "argument", 0,
            &index) != TCL_OK) {
          return TCL_ERROR;
      }
      if (index == OPT_ISABOVE) {
          result = index1 > index2;
      } else { /* OPT_ISBELOW */
          result = index1 < index2;
      }
      Tcl_SetIntObj(Tcl_GetObjResult(interp), result);
      return TCL_OK;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmStateCmd --
 *
 *    This procedure is invoked to process the "wm state" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmStateCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    static CONST char *optionStrings[] = {
      "normal", "iconic", "withdrawn", (char *) NULL };
    enum options {
      OPT_NORMAL, OPT_ICONIC, OPT_WITHDRAWN };
    int index;

    if ((objc < 3) || (objc > 4)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?state?");
      return TCL_ERROR;
    }
    if (objc == 4) {
      if (wmPtr->iconFor != NULL) {
          Tcl_AppendResult(interp, "can't change state of ",
                Tcl_GetString(objv[2]),
                ": it is an icon for ", Tk_PathName(wmPtr->iconFor),
                (char *) NULL);
          return TCL_ERROR;
      }

      if (Tcl_GetIndexFromObj(interp, objv[3], optionStrings, "argument", 0,
            &index) != TCL_OK) {
          return TCL_ERROR;
      }

      if (index == OPT_NORMAL) {
          wmPtr->flags &= ~WM_WITHDRAWN;
          (void) TkpWmSetState(winPtr, NormalState);
      } else if (index == OPT_ICONIC) {
          if (Tk_Attributes((Tk_Window) winPtr)->override_redirect) {
            Tcl_AppendResult(interp, "can't iconify \"",
                  winPtr->pathName,
                  "\": override-redirect flag is set",
                  (char *) NULL);
            return TCL_ERROR;
          }
          if (wmPtr->masterPtr != NULL) {
            Tcl_AppendResult(interp, "can't iconify \"",
                  winPtr->pathName,
                  "\": it is a transient", (char *) NULL);
            return TCL_ERROR;
          }
          if (TkpWmSetState(winPtr, IconicState) == 0) {
            Tcl_SetResult(interp,
                  "couldn't send iconify message to window manager",
                  TCL_STATIC);
            return TCL_ERROR;
          }
      } else { /* OPT_WITHDRAWN */
          wmPtr->flags |= WM_WITHDRAWN;
          if (TkpWmSetState(winPtr, WithdrawnState) == 0) {
            Tcl_SetResult(interp,
                  "couldn't send withdraw message to window manager",
                  TCL_STATIC);
            return TCL_ERROR;
          }
      }
    } else {
      if (wmPtr->iconFor != NULL) {
          Tcl_SetResult(interp, "icon", TCL_STATIC);
      } else if (wmPtr->withdrawn) {
          Tcl_SetResult(interp, "withdrawn", TCL_STATIC);
      } else if (Tk_IsMapped((Tk_Window) winPtr)
            || ((wmPtr->flags & WM_NEVER_MAPPED)
                  && (wmPtr->hints.initial_state == NormalState))) {
          Tcl_SetResult(interp, "normal", TCL_STATIC);
      } else {
          Tcl_SetResult(interp, "iconic", TCL_STATIC);
      }
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmTitleCmd --
 *
 *    This procedure is invoked to process the "wm title" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmTitleCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    char *argv3;
    int length;

    if (objc > 4) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?newTitle?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      Tcl_SetResult(interp, (char *)
            ((wmPtr->title != NULL) ? wmPtr->title : winPtr->nameUid),
            TCL_STATIC);
      return TCL_OK;
    } else {
      if (wmPtr->title != NULL) {
          ckfree((char *) wmPtr->title);
      }
      argv3 = Tcl_GetStringFromObj(objv[3], &length);
      wmPtr->title = ckalloc((unsigned) (length + 1));
      strcpy(wmPtr->title, argv3);

      if (!(wmPtr->flags & WM_NEVER_MAPPED)) {
          XTextProperty textProp;
          Tcl_DString ds;

          Tcl_UtfToExternalDString(NULL, wmPtr->title, -1, &ds);
          if (XStringListToTextProperty(&(Tcl_DStringValue(&ds)), 1,
                &textProp)  != 0) {
            XSetWMName(winPtr->display, wmPtr->wrapperPtr->window,
                  &textProp);
            XFree((char *) textProp.value);
          }
          Tcl_DStringFree(&ds);
      }
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmTransientCmd --
 *
 *    This procedure is invoked to process the "wm transient" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmTransientCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    TkWindow *masterPtr = wmPtr->masterPtr;
    WmInfo *wmPtr2;

    if ((objc != 3) && (objc != 4)) {
      Tcl_WrongNumArgs(interp, 2, objv, "window ?master?");
      return TCL_ERROR;
    }
    if (objc == 3) {
      if (masterPtr != NULL) {
          Tcl_SetResult(interp, Tk_PathName(masterPtr), TCL_STATIC);
      }
      return TCL_OK;
    }
    if (Tcl_GetString(objv[3])[0] == '\0') {
      if (masterPtr != NULL) {
          /*
           * If we had a master, tell them that we aren't tied
           * to them anymore
           */

          masterPtr->wmInfoPtr->numTransients--;
          Tk_DeleteEventHandler((Tk_Window) masterPtr,
                StructureNotifyMask,
                WmWaitMapProc, (ClientData) winPtr);

          /* FIXME: Need a call like Win32's UpdateWrapper() so
             we can recreate the wrapper and get rid of the
             transient window decorations. */
      }

      wmPtr->masterPtr = NULL;
    } else {
      if (TkGetWindowFromObj(interp, tkwin, objv[3],
            (Tk_Window *) &masterPtr) != TCL_OK) {
          return TCL_ERROR;
      }
      while (!Tk_TopWinHierarchy(masterPtr)) {
          /*
           * Ensure that the master window is actually a Tk toplevel.
           */

          masterPtr = masterPtr->parentPtr;
      }
      Tk_MakeWindowExist((Tk_Window) masterPtr);

      if (wmPtr->iconFor != NULL) {
          Tcl_AppendResult(interp, "can't make \"",
                Tcl_GetString(objv[2]),
                "\" a transient: it is an icon for ",
                Tk_PathName(wmPtr->iconFor),
                (char *) NULL);
          return TCL_ERROR;
      }

      wmPtr2 = masterPtr->wmInfoPtr;
      if (wmPtr2->wrapperPtr == NULL) {
          CreateWrapper(wmPtr2);
      }

      if (wmPtr2->iconFor != NULL) {
          Tcl_AppendResult(interp, "can't make \"",
                Tcl_GetString(objv[3]),
                "\" a master: it is an icon for ",
                Tk_PathName(wmPtr2->iconFor),
                (char *) NULL);
          return TCL_ERROR;
      }

      if (masterPtr == winPtr) {
          Tcl_AppendResult(interp, "can't make \"", Tk_PathName(winPtr),
                "\" its own master",
                (char *) NULL);
          return TCL_ERROR;
      } else if (masterPtr != wmPtr->masterPtr) {
          /*
           * Remove old master map/unmap binding before setting
           * the new master. The event handler will ensure that
           * transient states reflect the state of the master.
           */

          if (wmPtr->masterPtr != NULL) {
            wmPtr->masterPtr->wmInfoPtr->numTransients--;
            Tk_DeleteEventHandler((Tk_Window) wmPtr->masterPtr,
                  StructureNotifyMask,
                  WmWaitMapProc, (ClientData) winPtr);
          }

          masterPtr->wmInfoPtr->numTransients++;
          Tk_CreateEventHandler((Tk_Window) masterPtr,
                StructureNotifyMask,
                WmWaitMapProc, (ClientData) winPtr);

          wmPtr->masterPtr = masterPtr;
      }
    }
    if (!(wmPtr->flags & WM_NEVER_MAPPED)) {
      if (wmPtr->masterPtr != NULL && !Tk_IsMapped(wmPtr->masterPtr)) {
          if (TkpWmSetState(winPtr, WithdrawnState) == 0) {
            Tcl_SetResult(interp,
                  "couldn't send withdraw message to window manager",
                  TCL_STATIC);
            return TCL_ERROR;
          }
      } else {
          Window xwin = (wmPtr->masterPtr == NULL) ? None :
                wmPtr->masterPtr->wmInfoPtr->wrapperPtr->window;
          XSetTransientForHint(winPtr->display, wmPtr->wrapperPtr->window,
                xwin);
      }
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * WmWithdrawCmd --
 *
 *    This procedure is invoked to process the "wm withdraw" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
WmWithdrawCmd(tkwin, winPtr, interp, objc, objv)
    Tk_Window tkwin;          /* Main window of the application. */
    TkWindow *winPtr;           /* Toplevel to work with */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;

    if (objc != 3) {
      Tcl_WrongNumArgs(interp, 2, objv, "window");
      return TCL_ERROR;
    }
    if (wmPtr->iconFor != NULL) {
      Tcl_AppendResult(interp, "can't withdraw ", Tcl_GetString(objv[2]),
            ": it is an icon for ", Tk_PathName(wmPtr->iconFor),
            (char *) NULL);
      return TCL_ERROR;
    }
    wmPtr->flags |= WM_WITHDRAWN;
    if (TkpWmSetState(winPtr, WithdrawnState) == 0) {
      Tcl_SetResult(interp,
            "couldn't send withdraw message to window manager",
            TCL_STATIC);
      return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 * Invoked by those wm subcommands that affect geometry.
 * Schedules a geometry update.
 */
static void
WmUpdateGeom(wmPtr, winPtr)
    WmInfo *wmPtr;
    TkWindow *winPtr;
{
    if (!(wmPtr->flags & (WM_UPDATE_PENDING|WM_NEVER_MAPPED))) {
      Tcl_DoWhenIdle(UpdateGeometryInfo, (ClientData) winPtr);
      wmPtr->flags |= WM_UPDATE_PENDING;
    }
}

/*
 * Invoked when a MapNotify or UnmapNotify event is delivered for a
 * toplevel that is the master of a transient toplevel.
 */
static void
WmWaitMapProc(clientData, eventPtr)
    ClientData clientData;    /* Pointer to window. */
    XEvent *eventPtr;         /* Information about event. */
{
    TkWindow *winPtr = (TkWindow *) clientData;
    TkWindow *masterPtr = winPtr->wmInfoPtr->masterPtr;

    if (masterPtr == NULL)
        return;

    if (eventPtr->type == MapNotify) {
        if (!(winPtr->wmInfoPtr->flags & WM_WITHDRAWN))
            (void) TkpWmSetState(winPtr, NormalState);
    } else if (eventPtr->type == UnmapNotify) {
        (void) TkpWmSetState(winPtr, WithdrawnState);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_SetGrid --
 *
 *    This procedure is invoked by a widget when it wishes to set a grid
 *    coordinate system that controls the size of a top-level window.
 *    It provides a C interface equivalent to the "wm grid" command and
 *    is usually asscoiated with the -setgrid option.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Grid-related information will be passed to the window manager, so
 *    that the top-level window associated with tkwin will resize on
 *    even grid units.  If some other window already controls gridding
 *    for the top-level window then this procedure call has no effect.
 *
 *----------------------------------------------------------------------
 */

void
Tk_SetGrid(tkwin, reqWidth, reqHeight, widthInc, heightInc)
    Tk_Window tkwin;          /* Token for window.  New window mgr info
                         * will be posted for the top-level window
                         * associated with this window. */
    int reqWidth;       /* Width (in grid units) corresponding to
                         * the requested geometry for tkwin. */
    int reqHeight;            /* Height (in grid units) corresponding to
                         * the requested geometry for tkwin. */
    int widthInc, heightInc;  /* Pixel increments corresponding to a
                         * change of one grid unit. */
{
    TkWindow *winPtr = (TkWindow *) tkwin;
    register WmInfo *wmPtr;

    /*
     * Find the top-level window for tkwin, plus the window manager
     * information.
     */

    while (!(winPtr->flags & TK_TOP_HIERARCHY)) {
      winPtr = winPtr->parentPtr;
      if (winPtr == NULL) {
          /*
           * The window is being deleted... just skip this operation.
           */

          return;
      }
    }
    wmPtr = winPtr->wmInfoPtr;
    if (wmPtr == NULL) {
      return;
    }

    if ((wmPtr->gridWin != NULL) && (wmPtr->gridWin != tkwin)) {
      return;
    }

    if ((wmPtr->reqGridWidth == reqWidth)
          && (wmPtr->reqGridHeight == reqHeight)
          && (wmPtr->widthInc == widthInc)
          && (wmPtr->heightInc == heightInc)
          && ((wmPtr->sizeHintsFlags & (PBaseSize|PResizeInc))
                == (PBaseSize|PResizeInc))) {
      return;
    }

    /*
     * If gridding was previously off, then forget about any window
     * size requests made by the user or via "wm geometry":  these are
     * in pixel units and there's no easy way to translate them to
     * grid units since the new requested size of the top-level window in
     * pixels may not yet have been registered yet (it may filter up
     * the hierarchy in DoWhenIdle handlers).  However, if the window
     * has never been mapped yet then just leave the window size alone:
     * assume that it is intended to be in grid units but just happened
     * to have been specified before this procedure was called.
     */

    if ((wmPtr->gridWin == NULL) && !(wmPtr->flags & WM_NEVER_MAPPED)) {
      wmPtr->width = -1;
      wmPtr->height = -1;
    }

    /*
     * Set the new gridding information, and start the process of passing
     * all of this information to the window manager.
     */

    wmPtr->gridWin = tkwin;
    wmPtr->reqGridWidth = reqWidth;
    wmPtr->reqGridHeight = reqHeight;
    wmPtr->widthInc = widthInc;
    wmPtr->heightInc = heightInc;
    wmPtr->sizeHintsFlags |= PBaseSize|PResizeInc;
    wmPtr->flags |= WM_UPDATE_SIZE_HINTS;
    if (!(wmPtr->flags & (WM_UPDATE_PENDING|WM_NEVER_MAPPED))) {
      Tcl_DoWhenIdle(UpdateGeometryInfo, (ClientData) winPtr);
      wmPtr->flags |= WM_UPDATE_PENDING;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_UnsetGrid --
 *
 *    This procedure cancels the effect of a previous call
 *    to Tk_SetGrid.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    If tkwin currently controls gridding for its top-level window,
 *    gridding is cancelled for that top-level window;  if some other
 *    window controls gridding then this procedure has no effect.
 *
 *----------------------------------------------------------------------
 */

void
Tk_UnsetGrid(tkwin)
    Tk_Window tkwin;          /* Token for window that is currently
                         * controlling gridding. */
{
    TkWindow *winPtr = (TkWindow *) tkwin;
    register WmInfo *wmPtr;

    /*
     * Find the top-level window for tkwin, plus the window manager
     * information.
     */

    while (!(winPtr->flags & TK_TOP_HIERARCHY)) {
      winPtr = winPtr->parentPtr;
      if (winPtr == NULL) {
          /*
           * The window is being deleted... just skip this operation.
           */

          return;
      }
    }
    wmPtr = winPtr->wmInfoPtr;
    if (wmPtr == NULL) {
      return;
    }

    if (tkwin != wmPtr->gridWin) {
      return;
    }

    wmPtr->gridWin = NULL;
    wmPtr->sizeHintsFlags &= ~(PBaseSize|PResizeInc);
    if (wmPtr->width != -1) {
      wmPtr->width = winPtr->reqWidth + (wmPtr->width
            - wmPtr->reqGridWidth)*wmPtr->widthInc;
      wmPtr->height = winPtr->reqHeight + (wmPtr->height
            - wmPtr->reqGridHeight)*wmPtr->heightInc;
    }
    wmPtr->widthInc = 1;
    wmPtr->heightInc = 1;

    wmPtr->flags |= WM_UPDATE_SIZE_HINTS;
    if (!(wmPtr->flags & (WM_UPDATE_PENDING|WM_NEVER_MAPPED))) {
      Tcl_DoWhenIdle(UpdateGeometryInfo, (ClientData) winPtr);
      wmPtr->flags |= WM_UPDATE_PENDING;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * ConfigureEvent --
 *
 *    This procedure is called to handle ConfigureNotify events on
 *    wrapper windows.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Information gets updated in the WmInfo structure for the window
 *    and the toplevel itself gets repositioned within the wrapper.
 *
 *----------------------------------------------------------------------
 */

static void
ConfigureEvent(wmPtr, configEventPtr)
    WmInfo *wmPtr;                  /* Information about toplevel window. */
    XConfigureEvent *configEventPtr;      /* Event that just occurred for
                               * wmPtr->wrapperPtr. */
{
    TkWindow *wrapperPtr = wmPtr->wrapperPtr;
    TkWindow *winPtr = wmPtr->winPtr;
    TkDisplay *dispPtr = wmPtr->winPtr->dispPtr;
    Tk_ErrorHandler handler;

    /*
     * Update size information from the event.  There are a couple of
     * tricky points here:
     *
     * 1. If the user changed the size externally then set wmPtr->width
     *    and wmPtr->height just as if a "wm geometry" command had been
     *    invoked with the same information.
     * 2. However, if the size is changing in response to a request
     *    coming from us (WM_SYNC_PENDING is set), then don't set wmPtr->width
     *    or wmPtr->height if they were previously -1 (otherwise the
     *    window will stop tracking geometry manager requests).
     */

    if (((wrapperPtr->changes.width != configEventPtr->width)
          || (wrapperPtr->changes.height != configEventPtr->height))
          && !(wmPtr->flags & WM_SYNC_PENDING)){
      if (dispPtr->flags & TK_DISPLAY_WM_TRACING) {
          printf("TopLevelEventProc: user changed %s size to %dx%d\n",
                winPtr->pathName, configEventPtr->width,
                configEventPtr->height);
      }
      if ((wmPtr->width == -1)
            && (configEventPtr->width == winPtr->reqWidth)) {
          /*
           * Don't set external width, since the user didn't change it
           * from what the widgets asked for.
           */
      } else {
          /*
           * Note: if this window is embedded then don't set the external
           * size, since it came from the containing application, not the
           * user.  In this case we want to keep sending our size requests
           * to the containing application;  if the user fixes the size
           * of that application then it will still percolate down to us
           * in the right way.
           */

          if (!(winPtr->flags & TK_EMBEDDED)) {
            if (wmPtr->gridWin != NULL) {
                wmPtr->width = wmPtr->reqGridWidth
                      + (configEventPtr->width
                      - winPtr->reqWidth)/wmPtr->widthInc;
                if (wmPtr->width < 0) {
                  wmPtr->width = 0;
                }
            } else {
                wmPtr->width = configEventPtr->width;
            }
          }
      }
      if ((wmPtr->height == -1)
            && (configEventPtr->height ==
                  (winPtr->reqHeight + wmPtr->menuHeight))) {
          /*
           * Don't set external height, since the user didn't change it
           * from what the widgets asked for.
           */
      } else {
          /*
           * See note for wmPtr->width about not setting external size
           * for embedded windows.
           */

          if (!(winPtr->flags & TK_EMBEDDED)) {
            if (wmPtr->gridWin != NULL) {
                wmPtr->height = wmPtr->reqGridHeight
                      + (configEventPtr->height - wmPtr->menuHeight
                      - winPtr->reqHeight)/wmPtr->heightInc;
                if (wmPtr->height < 0) {
                  wmPtr->height = 0;
                }
            } else {
                wmPtr->height = configEventPtr->height - wmPtr->menuHeight;
            }
            }
      }
      wmPtr->configWidth = configEventPtr->width;
      wmPtr->configHeight = configEventPtr->height;
    }

    if (dispPtr->flags & TK_DISPLAY_WM_TRACING) {
      printf("ConfigureEvent: %s x = %d y = %d, width = %d, height = %d\n",
            winPtr->pathName, configEventPtr->x, configEventPtr->y,
            configEventPtr->width, configEventPtr->height);
      printf("    send_event = %d, serial = %ld (win %p, wrapper %p)\n",
            configEventPtr->send_event, configEventPtr->serial,
            winPtr, wrapperPtr);
    }
    wrapperPtr->changes.width = configEventPtr->width;
    wrapperPtr->changes.height = configEventPtr->height;
    wrapperPtr->changes.border_width = configEventPtr->border_width;
    wrapperPtr->changes.sibling = configEventPtr->above;
    wrapperPtr->changes.stack_mode = Above;

    /*
     * Reparenting window managers make life difficult.  If the
     * window manager reparents a top-level window then the x and y
     * information that comes in events for the window is wrong:
     * it gives the location of the window inside its decorative
     * parent, rather than the location of the window in root
     * coordinates, which is what we want.  Window managers
     * are supposed to send synthetic events with the correct
     * information, but ICCCM doesn't require them to do this
     * under all conditions, and the information provided doesn't
     * include everything we need here.  So, the code below
     * maintains a bunch of information about the parent window.
     * If the window hasn't been reparented, we pretend that
     * there is a parent shrink-wrapped around the window.
     */

    if (dispPtr->flags & TK_DISPLAY_WM_TRACING) {
      printf("    %s parent == %p, above %p\n",
            winPtr->pathName, (void *) wmPtr->reparent,
            (void *) configEventPtr->above);
    }

    if ((wmPtr->reparent == None) || !ComputeReparentGeometry(wmPtr)) {
      wmPtr->parentWidth = configEventPtr->width
            + 2*configEventPtr->border_width;
      wmPtr->parentHeight = configEventPtr->height
            + 2*configEventPtr->border_width;
      wrapperPtr->changes.x = wmPtr->x = configEventPtr->x;
      wrapperPtr->changes.y = wmPtr->y = configEventPtr->y;
      if (wmPtr->flags & WM_NEGATIVE_X) {
          wmPtr->x = wmPtr->vRootWidth - (wmPtr->x + wmPtr->parentWidth);
      }
      if (wmPtr->flags & WM_NEGATIVE_Y) {
          wmPtr->y = wmPtr->vRootHeight - (wmPtr->y + wmPtr->parentHeight);
      }
    }

    /*
     * Make sure that the toplevel and menubar are properly positioned within
     * the wrapper.  If the menuHeight happens to be zero, we'll get a
     * BadValue X error that we want to ignore [Bug: 3377]
     */
    handler = Tk_CreateErrorHandler(winPtr->display, -1, -1, -1,
          (Tk_ErrorProc *) NULL, (ClientData) NULL);
    XMoveResizeWindow(winPtr->display, winPtr->window, 0,
          wmPtr->menuHeight, (unsigned) wrapperPtr->changes.width,
          (unsigned) (wrapperPtr->changes.height - wmPtr->menuHeight));
    Tk_DeleteErrorHandler(handler);
    if ((wmPtr->menubar != NULL)
          && ((Tk_Width(wmPtr->menubar) != wrapperPtr->changes.width)
          || (Tk_Height(wmPtr->menubar) != wmPtr->menuHeight))) {
      Tk_MoveResizeWindow(wmPtr->menubar, 0, 0, wrapperPtr->changes.width,
            wmPtr->menuHeight);
    }

    /*
     * Update the coordinates in the toplevel (they should refer to the
     * position in root window coordinates, not the coordinates of the
     * wrapper window).  Then synthesize a ConfigureNotify event to tell
     * the application about the change.
     */

    winPtr->changes.x = wrapperPtr->changes.x;
    winPtr->changes.y = wrapperPtr->changes.y + wmPtr->menuHeight;
    winPtr->changes.width = wrapperPtr->changes.width;
    winPtr->changes.height = wrapperPtr->changes.height - wmPtr->menuHeight;
    TkDoConfigureNotify(winPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * ReparentEvent --
 *
 *    This procedure is called to handle ReparentNotify events on
 *    wrapper windows.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Information gets updated in the WmInfo structure for the window.
 *
 *----------------------------------------------------------------------
 */

static void
ReparentEvent(wmPtr, reparentEventPtr)
    WmInfo *wmPtr;                  /* Information about toplevel window. */
    XReparentEvent *reparentEventPtr;     /* Event that just occurred for
                               * wmPtr->wrapperPtr. */
{
    TkWindow *wrapperPtr = wmPtr->wrapperPtr;
    Window vRoot, ancestor, *children, dummy2, *virtualRootPtr;
    Atom actualType;
    int actualFormat;
    unsigned long numItems, bytesAfter;
    unsigned int dummy;
    Tk_ErrorHandler handler;
    TkDisplay *dispPtr = wmPtr->winPtr->dispPtr;

    /*
     * Identify the root window for wrapperPtr.  This is tricky because of
     * virtual root window managers like tvtwm.  If the window has a
     * property named __SWM_ROOT or __WM_ROOT then this property gives
     * the id for a virtual root window that should be used instead of
     * the root window of the screen.
     */

    vRoot = RootWindow(wrapperPtr->display, wrapperPtr->screenNum);
    wmPtr->vRoot = None;
    handler = Tk_CreateErrorHandler(wrapperPtr->display, -1, -1, -1,
          (Tk_ErrorProc *) NULL, (ClientData) NULL);
    if (((XGetWindowProperty(wrapperPtr->display, wrapperPtr->window,
          Tk_InternAtom((Tk_Window) wrapperPtr, "__WM_ROOT"), 0, (long) 1,
          False, XA_WINDOW, &actualType, &actualFormat, &numItems,
          &bytesAfter, (unsigned char **) &virtualRootPtr) == Success)
          && (actualType == XA_WINDOW))
          || ((XGetWindowProperty(wrapperPtr->display, wrapperPtr->window,
          Tk_InternAtom((Tk_Window) wrapperPtr, "__SWM_ROOT"), 0, (long) 1,
          False, XA_WINDOW, &actualType, &actualFormat, &numItems,
          &bytesAfter, (unsigned char **) &virtualRootPtr) == Success)
          && (actualType == XA_WINDOW))) {
      if ((actualFormat == 32) && (numItems == 1)) {
          vRoot = wmPtr->vRoot = *virtualRootPtr;
      } else if (dispPtr->flags & TK_DISPLAY_WM_TRACING) {
          printf("%s format %d numItems %ld\n",
                "ReparentEvent got bogus VROOT property:", actualFormat,
                numItems);
      }
      XFree((char *) virtualRootPtr);
    }
    Tk_DeleteErrorHandler(handler);

    if (dispPtr->flags & TK_DISPLAY_WM_TRACING) {
      printf("ReparentEvent: %s (%p) reparented to 0x%x, vRoot = 0x%x\n",
            wmPtr->winPtr->pathName, wmPtr->winPtr,
            (unsigned int) reparentEventPtr->parent, (unsigned int) vRoot);
    }

    /*
     * Fetch correct geometry information for the new virtual root.
     */

    UpdateVRootGeometry(wmPtr);

    /*
     * If the window's new parent is the root window, then mark it as
     * no longer reparented.
     */

    if (reparentEventPtr->parent == vRoot) {
      noReparent:
      wmPtr->reparent = None;
      wmPtr->parentWidth = wrapperPtr->changes.width;
      wmPtr->parentHeight = wrapperPtr->changes.height;
      wmPtr->xInParent = wmPtr->yInParent = 0;
      wrapperPtr->changes.x = reparentEventPtr->x;
      wrapperPtr->changes.y = reparentEventPtr->y;
      wmPtr->winPtr->changes.x = reparentEventPtr->x;
      wmPtr->winPtr->changes.y = reparentEventPtr->y + wmPtr->menuHeight;
      return;
    }

    /*
     * Search up the window hierarchy to find the ancestor of this
     * window that is just below the (virtual) root.  This is tricky
     * because it's possible that things have changed since the event
     * was generated so that the ancestry indicated by the event no
     * longer exists.  If this happens then an error will occur and
     * we just discard the event (there will be a more up-to-date
     * ReparentNotify event coming later).
     */

    handler = Tk_CreateErrorHandler(wrapperPtr->display, -1, -1, -1,
          (Tk_ErrorProc *) NULL, (ClientData) NULL);
    wmPtr->reparent = reparentEventPtr->parent;
    while (1) {
      if (XQueryTree(wrapperPtr->display, wmPtr->reparent, &dummy2,
            &ancestor, &children, &dummy) == 0) {
          Tk_DeleteErrorHandler(handler);
          goto noReparent;
      }
      XFree((char *) children);
      if ((ancestor == vRoot) ||
            (ancestor == RootWindow(wrapperPtr->display,
            wrapperPtr->screenNum))) {
          break;
      }
      wmPtr->reparent = ancestor;
    }
    Tk_DeleteErrorHandler(handler);

    if (!ComputeReparentGeometry(wmPtr)) {
      goto noReparent;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * ComputeReparentGeometry --
 *
 *    This procedure is invoked to recompute geometry information
 *    related to a reparented top-level window, such as the position
 *    and total size of the parent and the position within it of
 *    the top-level window.
 *
 * Results:
 *    The return value is 1 if everything completed successfully
 *    and 0 if an error occurred while querying information about
 *    winPtr's parents.  In this case winPtr is marked as no longer
 *    being reparented.
 *
 * Side effects:
 *    Geometry information in wmPtr, wmPtr->winPtr, and
 *    wmPtr->wrapperPtr gets updated.
 *
 *----------------------------------------------------------------------
 */

static int
ComputeReparentGeometry(wmPtr)
    WmInfo *wmPtr;            /* Information about toplevel window
                         * whose reparent info is to be recomputed. */
{
    TkWindow *wrapperPtr = wmPtr->wrapperPtr;
    int width, height, bd;
    unsigned int dummy;
    int xOffset, yOffset, x, y;
    Window dummy2;
    Status status;
    Tk_ErrorHandler handler;
    TkDisplay *dispPtr = wmPtr->winPtr->dispPtr;

    handler = Tk_CreateErrorHandler(wrapperPtr->display, -1, -1, -1,
          (Tk_ErrorProc *) NULL, (ClientData) NULL);
    (void) XTranslateCoordinates(wrapperPtr->display, wrapperPtr->window,
          wmPtr->reparent, 0, 0, &xOffset, &yOffset, &dummy2);
    status = XGetGeometry(wrapperPtr->display, wmPtr->reparent,
          &dummy2, &x, &y, (unsigned int *) &width,
          (unsigned int *) &height, (unsigned int *) &bd, &dummy);
    Tk_DeleteErrorHandler(handler);
    if (status == 0) {
      /*
       * It appears that the reparented parent went away and
       * no-one told us.  Reset the window to indicate that
       * it's not reparented.
       */
      wmPtr->reparent = None;
      wmPtr->xInParent = wmPtr->yInParent = 0;
      return 0;
    }
    wmPtr->xInParent = xOffset + bd;
    wmPtr->yInParent = yOffset + bd;
    wmPtr->parentWidth = width + 2*bd;
    wmPtr->parentHeight = height + 2*bd;

    /*
     * Some tricky issues in updating wmPtr->x and wmPtr->y:
     *
     * 1. Don't update them if the event occurred because of something
     * we did (i.e. WM_SYNC_PENDING and WM_MOVE_PENDING are both set).
     * This is because window managers treat coords differently than Tk,
     * and no two window managers are alike. If the window manager moved
     * the window because we told it to, remember the coordinates we told
     * it, not the ones it actually moved it to.  This allows us to move
     * the window back to the same coordinates later and get the same
     * result. Without this check, windows can "walk" across the screen
     * under some conditions.
     *
     * 2. Don't update wmPtr->x and wmPtr->y unless wrapperPtr->changes.x
     * or wrapperPtr->changes.y has changed (otherwise a size change can
     * spoof us into thinking that the position changed too and defeat
     * the intent of (1) above.
     *
     * (As of 9/96 the above 2 comments appear to be stale.  They're
     * being left in place as a reminder of what was once true (and
     * perhaps should still be true?)).
     *
     * 3. Ignore size changes coming from the window system if we're
     * about to change the size ourselves but haven't seen the event for
     * it yet:  our size change is supposed to take priority.
     */

    if (!(wmPtr->flags & WM_MOVE_PENDING)
          && ((wrapperPtr->changes.x != (x + wmPtr->xInParent))
          || (wrapperPtr->changes.y != (y + wmPtr->yInParent)))) {
      wmPtr->x = x;
      if (wmPtr->flags & WM_NEGATIVE_X) {
          wmPtr->x = wmPtr->vRootWidth - (wmPtr->x + wmPtr->parentWidth);
      }
      wmPtr->y = y;
      if (wmPtr->flags & WM_NEGATIVE_Y) {
          wmPtr->y = wmPtr->vRootHeight - (wmPtr->y + wmPtr->parentHeight);
      }
    }

    wrapperPtr->changes.x = x + wmPtr->xInParent;
    wrapperPtr->changes.y = y + wmPtr->yInParent;
    if (dispPtr->flags & TK_DISPLAY_WM_TRACING) {
      printf("wrapperPtr %p coords %d,%d\n",
            wrapperPtr, wrapperPtr->changes.x, wrapperPtr->changes.y);
      printf("     wmPtr %p coords %d,%d, offsets %d %d\n",
            wmPtr, wmPtr->x, wmPtr->y, wmPtr->xInParent, wmPtr->yInParent);
    }
    return 1;
}

/*
 *----------------------------------------------------------------------
 *
 * WrapperEventProc --
 *
 *    This procedure is invoked by the event loop when a wrapper window
 *    is restructured.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Tk's internal data structures for the window get modified to
 *    reflect the structural change.
 *
 *----------------------------------------------------------------------
 */

static void
WrapperEventProc(clientData, eventPtr)
    ClientData clientData;          /* Information about toplevel window. */
    XEvent *eventPtr;               /* Event that just happened. */
{
    WmInfo *wmPtr = (WmInfo *) clientData;
    XEvent mapEvent;
    TkDisplay *dispPtr = wmPtr->winPtr->dispPtr;

    wmPtr->flags |= WM_VROOT_OFFSET_STALE;
    if (eventPtr->type == DestroyNotify) {
      Tk_ErrorHandler handler;

      if (!(wmPtr->wrapperPtr->flags & TK_ALREADY_DEAD)) {
          /*
           * A top-level window was deleted externally (e.g., by the window
           * manager).  This is probably not a good thing, but cleanup as
           * best we can.  The error handler is needed because
           * Tk_DestroyWindow will try to destroy the window, but of course
           * it's already gone.
           */

          handler = Tk_CreateErrorHandler(wmPtr->winPtr->display, -1, -1, -1,
                (Tk_ErrorProc *) NULL, (ClientData) NULL);
          Tk_DestroyWindow((Tk_Window) wmPtr->winPtr);
          Tk_DeleteErrorHandler(handler);
      }
      if (dispPtr->flags & TK_DISPLAY_WM_TRACING) {
          printf("TopLevelEventProc: %s deleted\n", wmPtr->winPtr->pathName);
      }
    } else if (eventPtr->type == ConfigureNotify) {
      /*
       * Ignore the event if the window has never been mapped yet.
       * Such an event occurs only in weird cases like changing the
       * internal border width of a top-level window, which results
       * in a synthetic Configure event.  These events are not relevant
       * to us, and if we process them confusion may result (e.g. we
       * may conclude erroneously that the user repositioned or resized
       * the window).
       */

      if (!(wmPtr->flags & WM_NEVER_MAPPED)) {
          ConfigureEvent(wmPtr, &eventPtr->xconfigure);
      }
    } else if (eventPtr->type == MapNotify) {
      wmPtr->wrapperPtr->flags |= TK_MAPPED;
      wmPtr->winPtr->flags |= TK_MAPPED;
      XMapWindow(wmPtr->winPtr->display, wmPtr->winPtr->window);
      goto doMapEvent;
    } else if (eventPtr->type == UnmapNotify) {
      wmPtr->wrapperPtr->flags &= ~TK_MAPPED;
      wmPtr->winPtr->flags &= ~TK_MAPPED;
      XUnmapWindow(wmPtr->winPtr->display, wmPtr->winPtr->window);
      goto doMapEvent;
    } else if (eventPtr->type == ReparentNotify) {
      ReparentEvent(wmPtr, &eventPtr->xreparent);
    }
    return;

    doMapEvent:
    mapEvent = *eventPtr;
    mapEvent.xmap.event = wmPtr->winPtr->window;
    mapEvent.xmap.window = wmPtr->winPtr->window;
    Tk_HandleEvent(&mapEvent);
}

/*
 *----------------------------------------------------------------------
 *
 * TopLevelReqProc --
 *
 *    This procedure is invoked by the geometry manager whenever
 *    the requested size for a top-level window is changed.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Arrange for the window to be resized to satisfy the request
 *    (this happens as a when-idle action).
 *
 *----------------------------------------------------------------------
 */

      /* ARGSUSED */
static void
TopLevelReqProc(dummy, tkwin)
    ClientData dummy;               /* Not used. */
    Tk_Window tkwin;                /* Information about window. */
{
    TkWindow *winPtr = (TkWindow *) tkwin;
    WmInfo *wmPtr;

    wmPtr = winPtr->wmInfoPtr;

    if ((wmPtr->width >= 0) && (wmPtr->height >= 0)) {
      /*
       * Explicit dimensions have been set for this window, so we
       * should ignore the geometry request.  It's actually important
       * to ignore the geometry request because, due to quirks in
       * window managers, invoking UpdateGeometryInfo may cause the
       * window to move.  For example, if "wm geometry -10-20" was
       * invoked, the window may be positioned incorrectly the first
       * time it appears (because we didn't know the proper width of
       * the window manager borders); if we invoke UpdateGeometryInfo
       * again, the window will be positioned correctly, which may
       * cause it to jump on the screen.
       */

      return;
    }

    wmPtr->flags |= WM_UPDATE_SIZE_HINTS;
    if (!(wmPtr->flags & (WM_UPDATE_PENDING|WM_NEVER_MAPPED))) {
      Tcl_DoWhenIdle(UpdateGeometryInfo, (ClientData) winPtr);
      wmPtr->flags |= WM_UPDATE_PENDING;
    }

    /*
     * If the window isn't being positioned by its upper left corner
     * then we have to move it as well.
     */

    if (wmPtr->flags & (WM_NEGATIVE_X | WM_NEGATIVE_Y)) {
      wmPtr->flags |= WM_MOVE_PENDING;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * UpdateGeometryInfo --
 *
 *    This procedure is invoked when a top-level window is first
 *    mapped, and also as a when-idle procedure, to bring the
 *    geometry and/or position of a top-level window back into
 *    line with what has been requested by the user and/or widgets.
 *    This procedure doesn't return until the window manager has
 *    responded to the geometry change.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The size and location of both the toplevel window and its wrapper
 *    may change, unless the WM prevents that from happening.
 *
 *----------------------------------------------------------------------
 */

static void
UpdateGeometryInfo(clientData)
    ClientData clientData;          /* Pointer to the window's record. */
{
    register TkWindow *winPtr = (TkWindow *) clientData;
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    int x, y, width, height;
    unsigned long serial;

    wmPtr->flags &= ~WM_UPDATE_PENDING;

    /*
     * Compute the new size for the top-level window.  See the
     * user documentation for details on this, but the size
     * requested depends on (a) the size requested internally
     * by the window's widgets, (b) the size requested by the
     * user in a "wm geometry" command or via wm-based interactive
     * resizing (if any), and (c) whether or not the window is
     * gridded.  Don't permit sizes <= 0 because this upsets
     * the X server.
     */

    if (wmPtr->width == -1) {
      width = winPtr->reqWidth;
    } else if (wmPtr->gridWin != NULL) {
      width = winPtr->reqWidth
            + (wmPtr->width - wmPtr->reqGridWidth)*wmPtr->widthInc;
    } else {
      width = wmPtr->width;
    }
    if (width <= 0) {
      width = 1;
    }
    if (wmPtr->height == -1) {
      height = winPtr->reqHeight;
    } else if (wmPtr->gridWin != NULL) {
      height = winPtr->reqHeight
            + (wmPtr->height - wmPtr->reqGridHeight)*wmPtr->heightInc;
    } else {
      height = wmPtr->height;
    }
    if (height <= 0) {
      height = 1;
    }

    /*
     * Compute the new position for the upper-left pixel of the window's
     * decorative frame.  This is tricky, because we need to include the
     * border widths supplied by a reparented parent in this calculation,
     * but can't use the parent's current overall size since that may
     * change as a result of this code.
     */

    if (wmPtr->flags & WM_NEGATIVE_X) {
      x = wmPtr->vRootWidth - wmPtr->x
            - (width + (wmPtr->parentWidth - winPtr->changes.width));
    } else {
      x =  wmPtr->x;
    }
    if (wmPtr->flags & WM_NEGATIVE_Y) {
      y = wmPtr->vRootHeight - wmPtr->y
            - (height + (wmPtr->parentHeight - winPtr->changes.height));
    } else {
      y =  wmPtr->y;
    }

    /*
     * If the window's size is going to change and the window is
     * supposed to not be resizable by the user, then we have to
     * update the size hints.  There may also be a size-hint-update
     * request pending from somewhere else, too.
     */

    if (((width != winPtr->changes.width)
          || (height != winPtr->changes.height))
          && (wmPtr->gridWin == NULL)
          && ((wmPtr->sizeHintsFlags & (PMinSize|PMaxSize)) == 0)) {
      wmPtr->flags |= WM_UPDATE_SIZE_HINTS;
    }
    if (wmPtr->flags & WM_UPDATE_SIZE_HINTS) {
      UpdateSizeHints(winPtr);
    }

    /*
     * Reconfigure the wrapper if it isn't already configured correctly.
     * A few tricky points:
     *
     * 1. If the window is embeddedand the container is also in this
     *    process, don't actually reconfigure the window; just pass the
     *    desired size on to the container.  Also, zero out any position
     *    information, since embedded windows are not allowed to move.
     * 2. Sometimes the window manager will give us a different size
     *    than we asked for (e.g. mwm has a minimum size for windows), so
     *    base the size check on what we *asked for* last time, not what we
     *    got.
     * 3. Can't just reconfigure always, because we may not get a
     *    ConfigureNotify event back if nothing changed, so
     *    WaitForConfigureNotify will hang a long time.
     * 4. Don't move window unless a new position has been requested for
     *        it.  This is because of "features" in some window managers (e.g.
     *    twm, as of 4/24/91) where they don't interpret coordinates
     *    according to ICCCM.  Moving a window to its current location may
     *    cause it to shift position on the screen.
     */

    if ((winPtr->flags & (TK_EMBEDDED|TK_BOTH_HALVES))
          == (TK_EMBEDDED|TK_BOTH_HALVES)) {
      /*
       * This window is embedded and the container is also in this
       * process, so we don't need to do anything special about the
       * geometry, except to make sure that the desired size is known
       * by the container.  Also, zero out any position information,
       * since embedded windows are not allowed to move.
       */

      wmPtr->x = wmPtr->y = 0;
      wmPtr->flags &= ~(WM_NEGATIVE_X|WM_NEGATIVE_Y);
      height += wmPtr->menuHeight;
      Tk_GeometryRequest((Tk_Window) TkpGetOtherWindow(winPtr),
            width, height);
      return;
    }
    serial = NextRequest(winPtr->display);
    height += wmPtr->menuHeight;
    if (wmPtr->flags & WM_MOVE_PENDING) {
      if ((x + wmPtr->xInParent == winPtr->changes.x) &&
            (y + wmPtr->yInParent + wmPtr->menuHeight == winPtr->changes.y)
            && (width == wmPtr->wrapperPtr->changes.width)
            && (height == wmPtr->wrapperPtr->changes.height)) {
          /*
           * The window already has the correct geometry, so don't bother
           * to configure it;  the X server appears to ignore these
           * requests, so we won't get back a ConfigureNotify and the
           * WaitForConfigureNotify call below will hang for a while.
           */

          wmPtr->flags &= ~WM_MOVE_PENDING;
          return;
      }
      wmPtr->configWidth = width;
      wmPtr->configHeight = height;
      if (winPtr->dispPtr->flags & TK_DISPLAY_WM_TRACING) {
         printf("UpdateGeometryInfo moving to %d %d, resizing to %d x %d,\n",
                   x, y, width, height);
      }
      XMoveResizeWindow(winPtr->display, wmPtr->wrapperPtr->window, x, y,
            (unsigned) width, (unsigned) height);
    } else if ((width != wmPtr->configWidth)
          || (height != wmPtr->configHeight)) {
      if ((width == wmPtr->wrapperPtr->changes.width)
            && (height == wmPtr->wrapperPtr->changes.height)) {
          /*
           * The window is already just the size we want, so don't bother
           * to configure it;  the X server appears to ignore these
           * requests, so we won't get back a ConfigureNotify and the
           * WaitForConfigureNotify call below will hang for a while.
           */

          return;
      }
      wmPtr->configWidth = width;
      wmPtr->configHeight = height;
      if (winPtr->dispPtr->flags & TK_DISPLAY_WM_TRACING) {
          printf("UpdateGeometryInfo resizing %p to %d x %d\n",
                (void *)wmPtr->wrapperPtr->window, width, height);
      }
      XResizeWindow(winPtr->display, wmPtr->wrapperPtr->window,
            (unsigned) width, (unsigned) height);
    } else if ((wmPtr->menubar != NULL)
          && ((Tk_Width(wmPtr->menubar) != wmPtr->wrapperPtr->changes.width)
          || (Tk_Height(wmPtr->menubar) != wmPtr->menuHeight))) {
      /*
       * It is possible that the window's overall size has not changed
       * but the menu size has.
       */

      Tk_MoveResizeWindow(wmPtr->menubar, 0, 0,
            wmPtr->wrapperPtr->changes.width, wmPtr->menuHeight);
      XResizeWindow(winPtr->display, wmPtr->wrapperPtr->window,
            (unsigned) width, (unsigned) height);
    } else {
      return;
    }

    /*
     * Wait for the configure operation to complete.  Don't need to do
     * this, however, if the window is about to be mapped:  it will be
     * taken care of elsewhere.
     */

    if (!(wmPtr->flags & WM_ABOUT_TO_MAP)) {
      WaitForConfigureNotify(winPtr, serial);
    }
}

/*
 *--------------------------------------------------------------
 *
 * UpdateSizeHints --
 *
 *    This procedure is called to update the window manager's
 *    size hints information from the information in a WmInfo
 *    structure.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Properties get changed for winPtr.
 *
 *--------------------------------------------------------------
 */

static void
UpdateSizeHints(winPtr)
    TkWindow *winPtr;
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    XSizeHints *hintsPtr;
    int maxWidth, maxHeight;

    wmPtr->flags &= ~WM_UPDATE_SIZE_HINTS;

    hintsPtr = XAllocSizeHints();
    if (hintsPtr == NULL) {
      return;
    }

    /*
     * Compute the pixel-based sizes for the various fields in the
     * size hints structure, based on the grid-based sizes in
     * our structure.
     */

    GetMaxSize(wmPtr, &maxWidth, &maxHeight);
    if (wmPtr->gridWin != NULL) {
      hintsPtr->base_width = winPtr->reqWidth
            - (wmPtr->reqGridWidth * wmPtr->widthInc);
      if (hintsPtr->base_width < 0) {
          hintsPtr->base_width = 0;
      }
      hintsPtr->base_height = winPtr->reqHeight + wmPtr->menuHeight
            - (wmPtr->reqGridHeight * wmPtr->heightInc);
      if (hintsPtr->base_height < 0) {
          hintsPtr->base_height = 0;
      }
      hintsPtr->min_width = hintsPtr->base_width
            + (wmPtr->minWidth * wmPtr->widthInc);
      hintsPtr->min_height = hintsPtr->base_height
            + (wmPtr->minHeight * wmPtr->heightInc);
      hintsPtr->max_width = hintsPtr->base_width
            + (maxWidth * wmPtr->widthInc);
      hintsPtr->max_height = hintsPtr->base_height
            + (maxHeight * wmPtr->heightInc);
    } else {
      hintsPtr->min_width = wmPtr->minWidth;
      hintsPtr->min_height = wmPtr->minHeight;
      hintsPtr->max_width = maxWidth;
      hintsPtr->max_height = maxHeight;
      hintsPtr->base_width = 0;
      hintsPtr->base_height = 0;
    }
    hintsPtr->width_inc = wmPtr->widthInc;
    hintsPtr->height_inc = wmPtr->heightInc;
    hintsPtr->min_aspect.x = wmPtr->minAspect.x;
    hintsPtr->min_aspect.y = wmPtr->minAspect.y;
    hintsPtr->max_aspect.x = wmPtr->maxAspect.x;
    hintsPtr->max_aspect.y = wmPtr->maxAspect.y;
    hintsPtr->win_gravity = wmPtr->gravity;
    hintsPtr->flags = wmPtr->sizeHintsFlags | PMinSize | PMaxSize;

    /*
     * If the window isn't supposed to be resizable, then set the
     * minimum and maximum dimensions to be the same.
     */

    if (wmPtr->flags & WM_WIDTH_NOT_RESIZABLE) {
      if (wmPtr->width >= 0) {
          hintsPtr->min_width = wmPtr->width;
      } else {
          hintsPtr->min_width = winPtr->reqWidth;
      }
      hintsPtr->max_width = hintsPtr->min_width;
    }
    if (wmPtr->flags & WM_HEIGHT_NOT_RESIZABLE) {
      if (wmPtr->height >= 0) {
          hintsPtr->min_height = wmPtr->height;
      } else {
          hintsPtr->min_height = winPtr->reqHeight + wmPtr->menuHeight;
      }
      hintsPtr->max_height = hintsPtr->min_height;
    }

    XSetWMNormalHints(winPtr->display, wmPtr->wrapperPtr->window, hintsPtr);

    XFree((char *) hintsPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * WaitForConfigureNotify --
 *
 *    This procedure is invoked in order to synchronize with the
 *    window manager.  It waits for a ConfigureNotify event to
 *    arrive, signalling that the window manager has seen an attempt
 *    on our part to move or resize a top-level window.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Delays the execution of the process until a ConfigureNotify event
 *    arrives with serial number at least as great as serial.  This
 *    is useful for two reasons:
 *
 *    1. It's important to distinguish ConfigureNotify events that are
 *       coming in response to a request we've made from those generated
 *       spontaneously by the user.  The reason for this is that if the
 *       user resizes the window we take that as an order to ignore
 *       geometry requests coming from inside the window hierarchy.  If
 *       we accidentally interpret a response to our request as a
 *       user-initiated action, the window will stop responding to
 *       new geometry requests.  To make this distinction, (a) this
 *       procedure sets a flag for TopLevelEventProc to indicate that
 *       we're waiting to sync with the wm, and (b) all changes to
 *       the size of a top-level window are followed by calls to this
 *       procedure.
 *    2. Races and confusion can come about if there are multiple
 *       operations outstanding at a time (e.g. two different resizes
 *       of the top-level window:  it's hard to tell which of the
 *       ConfigureNotify events coming back is for which request).
 *    While waiting, some events covered by StructureNotifyMask are
 *    processed (ConfigureNotify, MapNotify, and UnmapNotify) 
 *    and all others are deferred.
 *
 *----------------------------------------------------------------------
 */

static void
WaitForConfigureNotify(winPtr, serial)
    TkWindow *winPtr;         /* Top-level window for which we want
                         * to see a ConfigureNotify. */
    unsigned long serial;     /* Serial number of resize request.  Want to
                         * be sure wm has seen this. */
{
    WmInfo *wmPtr = winPtr->wmInfoPtr;
    XEvent event;
    int diff, code;
    int gotConfig = 0;

    /*
     * One more tricky detail about this procedure.  In some cases the
     * window manager will decide to ignore a configure request (e.g.
     * because it thinks the window is already in the right place).
     * To avoid hanging in this situation, only wait for a few seconds,
     * then give up.
     */

    while (!gotConfig) {
      wmPtr->flags |= WM_SYNC_PENDING;
      code = WaitForEvent(winPtr->display, wmPtr, ConfigureNotify, &event);
      wmPtr->flags &= ~WM_SYNC_PENDING;
      if (code != TCL_OK) {
          if (winPtr->dispPtr->flags & TK_DISPLAY_WM_TRACING) {
            printf("WaitForConfigureNotify giving up on %s\n",
                  winPtr->pathName);
          }
          break;
      }
      diff = event.xconfigure.serial - serial;
      if (diff >= 0) {
          gotConfig = 1;
      }
    }
    wmPtr->flags &= ~WM_MOVE_PENDING;
    if (winPtr->dispPtr->flags & TK_DISPLAY_WM_TRACING) {
      printf("WaitForConfigureNotify finished with %s, serial %ld\n",
            winPtr->pathName, serial);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * WaitForEvent --
 *
 *    This procedure is used by WaitForConfigureNotify and
 *    WaitForMapNotify to wait for an event of a certain type
 *    to arrive.
 *
 * Results:
 *    Under normal conditions, TCL_OK is returned and an event for
 *    display and window that matches "mask" is stored in *eventPtr.
 *    This event  has already been processed by Tk before this procedure
 *    returns.  If a long time goes by with no event of the right type
 *    arriving, or if an error occurs while waiting for the event to
 *    arrive, then TCL_ERROR is returned.
 *
 * Side effects:
 *    While waiting for the desired event to occur, Configurenotify,
 *    MapNotify, and UnmapNotify events for window are processed, 
 *    as are all ReparentNotify events.
 *
 *----------------------------------------------------------------------
 */

static int
WaitForEvent(display, wmInfoPtr, type, eventPtr)
    Display *display;         /* Display event is coming from. */
    WmInfo *wmInfoPtr;        /* Window for which event is desired. */
    int type;                 /* Type of event that is wanted. */
    XEvent *eventPtr;         /* Place to store event. */
{
    WaitRestrictInfo info;
    Tk_RestrictProc *oldRestrictProc;
    ClientData oldRestrictData;
    Tcl_Time timeout;

    /*
     * Set up an event filter to select just the events we want, and
     * a timer handler, then wait for events until we get the event
     * we want or a timeout happens.
     */

    info.display = display;
    info.wmInfoPtr = wmInfoPtr;
    info.type = type;
    info.eventPtr = eventPtr;
    info.foundEvent = 0;
    oldRestrictProc = Tk_RestrictEvents(WaitRestrictProc, (ClientData) &info,
          &oldRestrictData);

    TclpGetTime(&timeout);
    timeout.sec += 2;

    while (!info.foundEvent) {
      if (!TkUnixDoOneXEvent(&timeout)) {
          break;
      }
    }
    (void) Tk_RestrictEvents(oldRestrictProc, oldRestrictData,
          &oldRestrictData);
    if (info.foundEvent) {
      return TCL_OK;
    }
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * WaitRestrictProc --
 *
 *    This procedure is a Tk_RestrictProc that is used to filter
 *    events while WaitForEvent is active.
 *
 * Results:
 *    Returns TK_PROCESS_EVENT if the right event is found.  Also
 *    returns TK_PROCESS_EVENT if any ReparentNotify event is found
 *    or if the event is a ConfigureNotify, MapNotify, or UnmapNotify
 *    for window.  Otherwise returns TK_DEFER_EVENT.
 *
 * Side effects:
 *    An event may get stored in the area indicated by the caller
 *    of WaitForEvent.
 *
 *----------------------------------------------------------------------
 */

static Tk_RestrictAction
WaitRestrictProc(clientData, eventPtr)
    ClientData clientData;    /* Pointer to WaitRestrictInfo structure. */
    XEvent *eventPtr;         /* Event that is about to be handled. */
{
    WaitRestrictInfo *infoPtr = (WaitRestrictInfo *) clientData;

    if (eventPtr->type == ReparentNotify) {
      return TK_PROCESS_EVENT;
    }
    if (((eventPtr->xany.window != infoPtr->wmInfoPtr->wrapperPtr->window)
          && (eventPtr->xany.window != infoPtr->wmInfoPtr->reparent))
          || (eventPtr->xany.display != infoPtr->display)) {
      return TK_DEFER_EVENT;
    }
    if (eventPtr->type == infoPtr->type) {
      *infoPtr->eventPtr = *eventPtr;
      infoPtr->foundEvent = 1;
      return TK_PROCESS_EVENT;
    }
    if (eventPtr->type == ConfigureNotify 
         || eventPtr->type == MapNotify
         || eventPtr->type == UnmapNotify) {
      return TK_PROCESS_EVENT;
    }
    return TK_DEFER_EVENT;
}

/*
 *----------------------------------------------------------------------
 *
 * WaitForMapNotify --
 *
 *    This procedure is invoked in order to synchronize with the
 *    window manager.  It waits for the window's mapped state to
 *    reach the value given by mapped.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Delays the execution of the process until winPtr becomes mapped
 *    or unmapped, depending on the "mapped" argument.  This allows us
 *    to synchronize with the window manager, and allows us to
 *    identify changes in window size that come about when the window
 *    manager first starts managing the window (as opposed to those
 *    requested interactively by the user later).  See the comments
 *    for WaitForConfigureNotify and WM_SYNC_PENDING.  While waiting,
 *    some events covered by StructureNotifyMask are processed and all
 *    others are deferred.
 *
 *----------------------------------------------------------------------
 */

static void
WaitForMapNotify(winPtr, mapped)
    TkWindow *winPtr;         /* Top-level window for which we want
                         * to see a particular mapping state. */
    int mapped;               /* If non-zero, wait for window to become
                         * mapped, otherwise wait for it to become
                         * unmapped. */
{
    WmInfo *wmPtr = winPtr->wmInfoPtr;
    XEvent event;
    int code;

    while (1) {
      if (mapped) {
          if (winPtr->flags & TK_MAPPED) {
            break;
          }
      } else if (!(winPtr->flags & TK_MAPPED)) {
          break;
      }
      wmPtr->flags |= WM_SYNC_PENDING;
      code = WaitForEvent(winPtr->display, wmPtr,
            mapped ? MapNotify : UnmapNotify, &event);
      wmPtr->flags &= ~WM_SYNC_PENDING;
      if (code != TCL_OK) {
          /*
           * There are some bizarre situations in which the window
           * manager can't respond or chooses not to (e.g. if we've
           * got a grab set it can't respond).  If this happens then
           * just quit.
           */

          if (winPtr->dispPtr->flags & TK_DISPLAY_WM_TRACING) {
            printf("WaitForMapNotify giving up on %s\n", winPtr->pathName);
          }
          break;
      }
    }
    wmPtr->flags &= ~WM_MOVE_PENDING;
    if (winPtr->dispPtr->flags & TK_DISPLAY_WM_TRACING) {
      printf("WaitForMapNotify finished with %s (winPtr %p, wmPtr %p)\n",
            winPtr->pathName, winPtr, wmPtr);
    }
}

/*
 *--------------------------------------------------------------
 *
 * UpdateHints --
 *
 *    This procedure is called to update the window manager's
 *    hints information from the information in a WmInfo
 *    structure.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Properties get changed for winPtr.
 *
 *--------------------------------------------------------------
 */

static void
UpdateHints(winPtr)
    TkWindow *winPtr;
{
    WmInfo *wmPtr = winPtr->wmInfoPtr;

    if (wmPtr->flags & WM_NEVER_MAPPED) {
      return;
    }
    XSetWMHints(winPtr->display, wmPtr->wrapperPtr->window, &wmPtr->hints);
}

/*
 *--------------------------------------------------------------
 *
 * ParseGeometry --
 *
 *    This procedure parses a geometry string and updates
 *    information used to control the geometry of a top-level
 *    window.
 *
 * Results:
 *    A standard Tcl return value, plus an error message in
 *    the interp's result if an error occurs.
 *
 * Side effects:
 *    The size and/or location of winPtr may change.
 *
 *--------------------------------------------------------------
 */

static int
ParseGeometry(interp, string, winPtr)
    Tcl_Interp *interp;       /* Used for error reporting. */
    char *string;       /* String containing new geometry.  Has the
                         * standard form "=wxh+x+y". */
    TkWindow *winPtr;         /* Pointer to top-level window whose
                         * geometry is to be changed. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    int x, y, width, height, flags;
    char *end;
    register char *p = string;

    /*
     * The leading "=" is optional.
     */

    if (*p == '=') {
      p++;
    }

    /*
     * Parse the width and height, if they are present.  Don't
     * actually update any of the fields of wmPtr until we've
     * successfully parsed the entire geometry string.
     */

    width = wmPtr->width;
    height = wmPtr->height;
    x = wmPtr->x;
    y = wmPtr->y;
    flags = wmPtr->flags;
    if (isdigit(UCHAR(*p))) {
      width = strtoul(p, &end, 10);
      p = end;
      if (*p != 'x') {
          goto error;
      }
      p++;
      if (!isdigit(UCHAR(*p))) {
          goto error;
      }
      height = strtoul(p, &end, 10);
      p = end;
    }

    /*
     * Parse the X and Y coordinates, if they are present.
     */

    if (*p != '\0') {
      flags &= ~(WM_NEGATIVE_X | WM_NEGATIVE_Y);
      if (*p == '-') {
          flags |= WM_NEGATIVE_X;
      } else if (*p != '+') {
          goto error;
      }
      p++;
      if (!isdigit(UCHAR(*p)) && (*p != '-')) {
          goto error;
      }
      x = strtol(p, &end, 10);
      p = end;
      if (*p == '-') {
          flags |= WM_NEGATIVE_Y;
      } else if (*p != '+') {
          goto error;
      }
      p++;
      if (!isdigit(UCHAR(*p)) && (*p != '-')) {
          goto error;
      }
      y = strtol(p, &end, 10);
      if (*end != '\0') {
          goto error;
      }

      /*
       * Assume that the geometry information came from the user,
       * unless an explicit source has been specified.  Otherwise
       * most window managers assume that the size hints were
       * program-specified and they ignore them.
       */

      if ((wmPtr->sizeHintsFlags & (USPosition|PPosition)) == 0) {
          wmPtr->sizeHintsFlags |= USPosition;
          flags |= WM_UPDATE_SIZE_HINTS;
      }
    }

    /*
     * Everything was parsed OK.  Update the fields of *wmPtr and
     * arrange for the appropriate information to be percolated out
     * to the window manager at the next idle moment.
     */

    wmPtr->width = width;
    wmPtr->height = height;
    wmPtr->x = x;
    wmPtr->y = y;
    flags |= WM_MOVE_PENDING;
    wmPtr->flags = flags;

    if (!(wmPtr->flags & (WM_UPDATE_PENDING|WM_NEVER_MAPPED))) {
      Tcl_DoWhenIdle(UpdateGeometryInfo, (ClientData) winPtr);
      wmPtr->flags |= WM_UPDATE_PENDING;
    }
    return TCL_OK;

    error:
    Tcl_AppendResult(interp, "bad geometry specifier \"",
          string, "\"", (char *) NULL);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_GetRootCoords --
 *
 *    Given a token for a window, this procedure traces through the
 *    window's lineage to find the (virtual) root-window coordinates
 *    corresponding to point (0,0) in the window.
 *
 * Results:
 *    The locations pointed to by xPtr and yPtr are filled in with
 *    the root coordinates of the (0,0) point in tkwin.  If a virtual
 *    root window is in effect for the window, then the coordinates
 *    in the virtual root are returned.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

void
Tk_GetRootCoords(tkwin, xPtr, yPtr)
    Tk_Window tkwin;          /* Token for window. */
    int *xPtr;                /* Where to store x-displacement of (0,0). */
    int *yPtr;                /* Where to store y-displacement of (0,0). */
{
    int x, y;
    register TkWindow *winPtr = (TkWindow *) tkwin;

    /*
     * Search back through this window's parents all the way to a
     * top-level window, combining the offsets of each window within
     * its parent.
     */

    x = y = 0;
    while (1) {
      x += winPtr->changes.x + winPtr->changes.border_width;
      y += winPtr->changes.y + winPtr->changes.border_width;
      if ((winPtr->wmInfoPtr != NULL)
            && (winPtr->wmInfoPtr->menubar == (Tk_Window) winPtr)) {
          /*
           * This window is a special menubar; switch over to its
           * associated toplevel, compensate for their differences in
           * y coordinates, then continue with the toplevel (in case
           * it's embedded).
           */

          y -= winPtr->wmInfoPtr->menuHeight;
          winPtr = winPtr->wmInfoPtr->winPtr;
          continue;
      }
      if (winPtr->flags & TK_TOP_LEVEL) {
          TkWindow *otherPtr;

          if (!(winPtr->flags & TK_EMBEDDED)) {
            break;
          }
          otherPtr = TkpGetOtherWindow(winPtr);
          if (otherPtr == NULL) {
            /*
             * The container window is not in the same application.
             * Query the X server.
             */

            Window root, dummyChild;
            int rootX, rootY;

            root = winPtr->wmInfoPtr->vRoot;
            if (root == None) {
                root = RootWindowOfScreen(Tk_Screen((Tk_Window)winPtr));
            }
            XTranslateCoordinates(winPtr->display, winPtr->window,
                root, 0, 0, &rootX, &rootY, &dummyChild);
            x += rootX;
            y += rootY;
            break;
          } else {
            /*
             * The container window is in the same application.
             * Let's query its coordinates.
             */

            winPtr = otherPtr;
            continue;
          }
      }
      winPtr = winPtr->parentPtr;
      if (winPtr == NULL) {
          break;
      }
    }
    *xPtr = x;
    *yPtr = y;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_CoordsToWindow --
 *
 *    Given the (virtual) root coordinates of a point, this procedure
 *    returns the token for the top-most window covering that point,
 *    if there exists such a window in this application.
 *
 * Results:
 *    The return result is either a token for the window corresponding
 *    to rootX and rootY, or else NULL to indicate that there is no such
 *    window.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

Tk_Window
Tk_CoordsToWindow(rootX, rootY, tkwin)
    int rootX, rootY;         /* Coordinates of point in root window.  If
                         * a virtual-root window manager is in use,
                         * these coordinates refer to the virtual
                         * root, not the real root. */
    Tk_Window tkwin;          /* Token for any window in application;
                         * used to identify the display. */
{
    Window window, parent, child;
    int x, y, childX, childY, tmpx, tmpy, bd;
    WmInfo *wmPtr;
    TkWindow *winPtr, *childPtr, *nextPtr;
    TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr;
    Tk_ErrorHandler handler = NULL;

    /*
     * Step 1: scan the list of toplevel windows to see if there is a
     * virtual root for the screen we're interested in.  If so, we have
     * to translate the coordinates from virtual root to root
     * coordinates.
     */

    parent = window = RootWindowOfScreen(Tk_Screen(tkwin));
    x = rootX;
    y = rootY;
    for (wmPtr = (WmInfo *) dispPtr->firstWmPtr; wmPtr != NULL; wmPtr = wmPtr->nextPtr) {
      if (Tk_Screen(wmPtr->winPtr) != Tk_Screen(tkwin)) {
          continue;
      }
      if (wmPtr->vRoot == None) {
          continue;
      }
      UpdateVRootGeometry(wmPtr);
      parent = wmPtr->vRoot;
      break;
    }

    /*
     * Step 2: work down through the window hierarchy starting at the
     * root. For each window, find the child that contains the given
     * point and then see if this child is either a wrapper for one of
     * our toplevel windows or a window manager decoration window for
     * one of our toplevels.  This approach handles several tricky
     * cases:
     *
     * 1. There may be a virtual root window between the root and one of
     *    our toplevels.
     * 2. If a toplevel is embedded, we may have to search through the
     *    windows of the container application(s) before getting to
     *    the toplevel.
     */

    handler = Tk_CreateErrorHandler(Tk_Display(tkwin), -1, -1, -1,
          (Tk_ErrorProc *) NULL, (ClientData) NULL);
    while (1) {
      if (XTranslateCoordinates(Tk_Display(tkwin), parent, window,
            x, y, &childX, &childY, &child) == False) {
          /*
           * We can end up here when the window is in the middle of
           * being deleted
           */
          Tk_DeleteErrorHandler(handler);
          return NULL;
      }
      if (child == None) {
          Tk_DeleteErrorHandler(handler);
          return NULL;
      }
      for (wmPtr = (WmInfo *) dispPtr->firstWmPtr; wmPtr != NULL;
                wmPtr = wmPtr->nextPtr) {
          if (wmPtr->reparent == child) {
            goto gotToplevel;
          }
          if (wmPtr->wrapperPtr != NULL) {
            if (child == wmPtr->wrapperPtr->window) {
                goto gotToplevel;
            }
          } else if (child == wmPtr->winPtr->window) {
            goto gotToplevel;
          }
      }
      x = childX;
      y = childY;
      parent = window;
      window = child;
    }

    gotToplevel:
    if (handler) {
      /*
       * Check value of handler, because we can reach this label
       * from above or below
       */
      Tk_DeleteErrorHandler(handler);
      handler = NULL;
    }
    winPtr = wmPtr->winPtr;
    if (winPtr->mainPtr != ((TkWindow *) tkwin)->mainPtr) {
      return NULL;
    }

    /*
     * Step 3: at this point winPtr and wmPtr refer to the toplevel that
     * contains the given coordinates, and childX and childY give the
     * translated coordinates in the *parent* of the toplevel.  Now
     * decide whether the coordinates are in the menubar or the actual
     * toplevel, and translate the coordinates into the coordinate
     * system of that window.
     */

    x = childX - winPtr->changes.x;
    y = childY - winPtr->changes.y;
    if ((x < 0) || (x >= winPtr->changes.width)
          || (y >= winPtr->changes.height)) {
      return NULL;
    }
    if (y < 0) {
      winPtr = (TkWindow *) wmPtr->menubar;
      if (winPtr == NULL) {
          return NULL;
      }
      y += wmPtr->menuHeight;
      if (y < 0) {
          return NULL;
      }
    }

    /*
     * Step 4: work down through the hierarchy underneath the current
     * window. At each level, scan through all the children to find the
     * highest one in the stacking order that contains the point.  Then
     * repeat the whole process on that child.
     */

    while (1) {
      nextPtr = NULL;
      for (childPtr = winPtr->childList; childPtr != NULL;
            childPtr = childPtr->nextPtr) {
          if (!Tk_IsMapped(childPtr) || (childPtr->flags & TK_TOP_HIERARCHY)) {
            continue;
          }
          if (childPtr->flags & TK_REPARENTED) {
            continue;
          }
          tmpx = x - childPtr->changes.x;
          tmpy = y - childPtr->changes.y;
          bd = childPtr->changes.border_width;
          if ((tmpx >= -bd) && (tmpy >= -bd)
                && (tmpx < (childPtr->changes.width + bd))
                && (tmpy < (childPtr->changes.height + bd))) {
            nextPtr = childPtr;
          }
      }
      if (nextPtr == NULL) {
          break;
      }
      winPtr = nextPtr;
      x -= winPtr->changes.x;
      y -= winPtr->changes.y;
      if ((winPtr->flags & TK_CONTAINER)
            && (winPtr->flags & TK_BOTH_HALVES)) {
          /*
           * The window containing the point is a container, and the
           * embedded application is in this same process.  Switch
           * over to the toplevel for the embedded application and
           * start processing that toplevel from scratch.
           */

          winPtr = TkpGetOtherWindow(winPtr);
          wmPtr = winPtr->wmInfoPtr;
          childX = x;
          childY = y;
          goto gotToplevel;
      }
    }
    return (Tk_Window) winPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * UpdateVRootGeometry --
 *
 *    This procedure is called to update all the virtual root
 *    geometry information in wmPtr.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The vRootX, vRootY, vRootWidth, and vRootHeight fields in
 *    wmPtr are filled with the most up-to-date information.
 *
 *----------------------------------------------------------------------
 */

static void
UpdateVRootGeometry(wmPtr)
    WmInfo *wmPtr;            /* Window manager information to be
                         * updated.  The wmPtr->vRoot field must
                         * be valid. */
{
    TkWindow *winPtr = wmPtr->winPtr;
    int bd;
    unsigned int dummy;
    Window dummy2;
    Status status;
    Tk_ErrorHandler handler;

    /*
     * If this isn't a virtual-root window manager, just return information
     * about the screen.
     */

    wmPtr->flags &= ~WM_VROOT_OFFSET_STALE;
    if (wmPtr->vRoot == None) {
      noVRoot:
      wmPtr->vRootX = wmPtr->vRootY = 0;
      wmPtr->vRootWidth = DisplayWidth(winPtr->display, winPtr->screenNum);
      wmPtr->vRootHeight = DisplayHeight(winPtr->display, winPtr->screenNum);
      return;
    }

    /*
     * Refresh the virtual root information if it's out of date.
     */

    handler = Tk_CreateErrorHandler(winPtr->display, -1, -1, -1,
          (Tk_ErrorProc *) NULL, (ClientData) NULL);
    status = XGetGeometry(winPtr->display, wmPtr->vRoot,
          &dummy2, &wmPtr->vRootX, &wmPtr->vRootY,
          (unsigned int *) &wmPtr->vRootWidth,
          (unsigned int *) &wmPtr->vRootHeight, (unsigned int *) &bd,
          &dummy);
    if (winPtr->dispPtr->flags & TK_DISPLAY_WM_TRACING) {
      printf("UpdateVRootGeometry: x = %d, y = %d, width = %d, ",
            wmPtr->vRootX, wmPtr->vRootY, wmPtr->vRootWidth);
      printf("height = %d, status = %d\n", wmPtr->vRootHeight, status);
    }
    Tk_DeleteErrorHandler(handler);
    if (status == 0) {
      /*
       * The virtual root is gone!  Pretend that it never existed.
       */

      wmPtr->vRoot = None;
      goto noVRoot;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_GetVRootGeometry --
 *
 *    This procedure returns information about the virtual root
 *    window corresponding to a particular Tk window.
 *
 * Results:
 *    The values at xPtr, yPtr, widthPtr, and heightPtr are set
 *    with the offset and dimensions of the root window corresponding
 *    to tkwin.  If tkwin is being managed by a virtual root window
 *    manager these values correspond to the virtual root window being
 *    used for tkwin;  otherwise the offsets will be 0 and the
 *    dimensions will be those of the screen.
 *
 * Side effects:
 *    Vroot window information is refreshed if it is out of date.
 *
 *----------------------------------------------------------------------
 */

void
Tk_GetVRootGeometry(tkwin, xPtr, yPtr, widthPtr, heightPtr)
    Tk_Window tkwin;          /* Window whose virtual root is to be
                         * queried. */
    int *xPtr, *yPtr;         /* Store x and y offsets of virtual root
                         * here. */
    int *widthPtr, *heightPtr;      /* Store dimensions of virtual root here. */
{
    WmInfo *wmPtr;
    TkWindow *winPtr = (TkWindow *) tkwin;

    /*
     * Find the top-level window for tkwin, and locate the window manager
     * information for that window.
     */

    while (!(winPtr->flags & TK_TOP_HIERARCHY) && (winPtr->parentPtr != NULL)) {
      winPtr = winPtr->parentPtr;
    }
    wmPtr = winPtr->wmInfoPtr;
    if (wmPtr == NULL) {
      /* Punt. */
      *xPtr = 0;
      *yPtr = 0;
      *widthPtr = 0;
      *heightPtr = 0;
    }


    /*
     * Make sure that the geometry information is up-to-date, then copy
     * it out to the caller.
     */

    if (wmPtr->flags & WM_VROOT_OFFSET_STALE) {
      UpdateVRootGeometry(wmPtr);
    }
    *xPtr = wmPtr->vRootX;
    *yPtr = wmPtr->vRootY;
    *widthPtr = wmPtr->vRootWidth;
    *heightPtr = wmPtr->vRootHeight;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_MoveToplevelWindow --
 *
 *    This procedure is called instead of Tk_MoveWindow to adjust
 *    the x-y location of a top-level window.  It delays the actual
 *    move to a later time and keeps window-manager information
 *    up-to-date with the move
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The window is eventually moved so that its upper-left corner
 *    (actually, the upper-left corner of the window's decorative
 *    frame, if there is one) is at (x,y).
 *
 *----------------------------------------------------------------------
 */

void
Tk_MoveToplevelWindow(tkwin, x, y)
    Tk_Window tkwin;          /* Window to move. */
    int x, y;                 /* New location for window (within
                         * parent). */
{
    TkWindow *winPtr = (TkWindow *) tkwin;
    register WmInfo *wmPtr = winPtr->wmInfoPtr;

    if (!(winPtr->flags & TK_TOP_LEVEL)) {
      panic("Tk_MoveToplevelWindow called with non-toplevel window");
    }
    wmPtr->x = x;
    wmPtr->y = y;
    wmPtr->flags |= WM_MOVE_PENDING;
    wmPtr->flags &= ~(WM_NEGATIVE_X|WM_NEGATIVE_Y);
    if ((wmPtr->sizeHintsFlags & (USPosition|PPosition)) == 0) {
      wmPtr->sizeHintsFlags |= USPosition;
      wmPtr->flags |= WM_UPDATE_SIZE_HINTS;
    }

    /*
     * If the window has already been mapped, must bring its geometry
     * up-to-date immediately, otherwise an event might arrive from the
     * server that would overwrite wmPtr->x and wmPtr->y and lose the
     * new position.
     */

    if (!(wmPtr->flags & WM_NEVER_MAPPED)) {
      if (wmPtr->flags & WM_UPDATE_PENDING) {
          Tcl_CancelIdleCall(UpdateGeometryInfo, (ClientData) winPtr);
      }
      UpdateGeometryInfo((ClientData) winPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * UpdateWmProtocols --
 *
 *    This procedure transfers the most up-to-date information about
 *    window manager protocols from the WmInfo structure to the actual
 *    property on the top-level window.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The WM_PROTOCOLS property gets changed for wmPtr's window.
 *
 *----------------------------------------------------------------------
 */

static void
UpdateWmProtocols(wmPtr)
    register WmInfo *wmPtr;   /* Information about top-level window. */
{
    register ProtocolHandler *protPtr;
    Atom deleteWindowAtom;
    int count;
    Atom *arrayPtr, *atomPtr;

    /*
     * There are only two tricky parts here.  First, there could be any
     * number of atoms for the window, so count them and malloc an array
     * to hold all of their atoms.  Second, we *always* want to respond
     * to the WM_DELETE_WINDOW protocol, even if no-one's officially asked.
     */

    for (protPtr = wmPtr->protPtr, count = 1; protPtr != NULL;
          protPtr = protPtr->nextPtr, count++) {
      /* Empty loop body;  we're just counting the handlers. */
    }
    arrayPtr = (Atom *) ckalloc((unsigned) (count * sizeof(Atom)));
    deleteWindowAtom = Tk_InternAtom((Tk_Window) wmPtr->winPtr,
          "WM_DELETE_WINDOW");
    arrayPtr[0] = deleteWindowAtom;
    for (protPtr = wmPtr->protPtr, atomPtr = &arrayPtr[1];
          protPtr != NULL; protPtr = protPtr->nextPtr) {
      if (protPtr->protocol != deleteWindowAtom) {
          *atomPtr = protPtr->protocol;
          atomPtr++;
      }
    }
    XChangeProperty(wmPtr->winPtr->display, wmPtr->wrapperPtr->window,
          Tk_InternAtom((Tk_Window) wmPtr->winPtr, "WM_PROTOCOLS"),
          XA_ATOM, 32, PropModeReplace, (unsigned char *) arrayPtr,
          atomPtr-arrayPtr);
    ckfree((char *) arrayPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TkWmProtocolEventProc --
 *
 *    This procedure is called by the Tk_HandleEvent whenever a
 *    ClientMessage event arrives whose type is "WM_PROTOCOLS".
 *    This procedure handles the message from the window manager
 *    in an appropriate fashion.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Depends on what sort of handler, if any, was set up for the
 *    protocol.
 *
 *----------------------------------------------------------------------
 */

void
TkWmProtocolEventProc(winPtr, eventPtr)
    TkWindow *winPtr;         /* Window to which the event was sent. */
    XEvent *eventPtr;         /* X event. */
{
    WmInfo *wmPtr;
    register ProtocolHandler *protPtr;
    Atom protocol;
    int result;
    CONST char *protocolName;
    Tcl_Interp *interp;

    wmPtr = winPtr->wmInfoPtr;
    if (wmPtr == NULL) {
      return;
    }
    protocol = (Atom) eventPtr->xclient.data.l[0];

    /*
     * Note: it's very important to retrieve the protocol name now,
     * before invoking the command, even though the name won't be used
     * until after the command returns.  This is because the command
     * could delete winPtr, making it impossible for us to use it
     * later in the call to Tk_GetAtomName.
     */

    protocolName = Tk_GetAtomName((Tk_Window) winPtr, protocol);
    for (protPtr = wmPtr->protPtr; protPtr != NULL;
          protPtr = protPtr->nextPtr) {
      if (protocol == protPtr->protocol) {
          Tcl_Preserve((ClientData) protPtr);
            interp = protPtr->interp;
            Tcl_Preserve((ClientData) interp);
          result = Tcl_GlobalEval(interp, protPtr->command);
          if (result != TCL_OK) {
            Tcl_AddErrorInfo(interp, "\n    (command for \"");
            Tcl_AddErrorInfo(interp, protocolName);
            Tcl_AddErrorInfo(interp,
                  "\" window manager protocol)");
            Tcl_BackgroundError(interp);
          }
            Tcl_Release((ClientData) interp);
          Tcl_Release((ClientData) protPtr);
          return;
      }
    }

    /*
     * No handler was present for this protocol.  If this is a
     * WM_DELETE_WINDOW message then just destroy the window.
     */

    if (protocol == Tk_InternAtom((Tk_Window) winPtr, "WM_DELETE_WINDOW")) {
      Tk_DestroyWindow((Tk_Window) wmPtr->winPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TkWmStackorderToplevelWrapperMap --
 *
 *    This procedure will create a table that maps the reparent wrapper
 *    X id for a toplevel to the TkWindow structure that is wraps.
 *    Tk keeps track of a mapping from the window X id to the TkWindow
 *    structure but that does us no good here since we only get the X
 *    id of the wrapper window. Only those toplevel windows that are
 *    mapped have a position in the stacking order.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Adds entries to the passed hashtable.
 *
 *----------------------------------------------------------------------
 */

static void
TkWmStackorderToplevelWrapperMap(winPtr, table)
    TkWindow *winPtr;                     /* TkWindow to recurse on */
    Tcl_HashTable *table;                 /* Maps X id to TkWindow */
{
    TkWindow *childPtr;
    Tcl_HashEntry *hPtr;
    Window wrapper;
    int newEntry;

    if (Tk_IsMapped(winPtr) && Tk_IsTopLevel(winPtr) &&
            !Tk_IsEmbedded(winPtr)) {
        wrapper = (winPtr->wmInfoPtr->reparent != None)
            ? winPtr->wmInfoPtr->reparent
            : winPtr->wmInfoPtr->wrapperPtr->window;

        hPtr = Tcl_CreateHashEntry(table,
            (char *) wrapper, &newEntry);
        Tcl_SetHashValue(hPtr, winPtr);
    }

    for (childPtr = winPtr->childList; childPtr != NULL;
            childPtr = childPtr->nextPtr) {
        TkWmStackorderToplevelWrapperMap(childPtr, table);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TkWmStackorderToplevel --
 *
 *    This procedure returns the stack order of toplevel windows.
 *
 * Results:
 *    An array of pointers to tk window objects in stacking order
 *    or else NULL if there was an error.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

TkWindow **
TkWmStackorderToplevel(parentPtr)
    TkWindow *parentPtr;            /* Parent toplevel window. */
{
    Window dummy1, dummy2, vRoot;
    Window *children;
    unsigned int numChildren, i;
    TkWindow *childWinPtr, **windows, **window_ptr;
    Tcl_HashTable table;
    Tcl_HashEntry *hPtr;
    Tcl_HashSearch search;

    /*
     * Map X Window ids to a TkWindow of the wrapped toplevel.
     */

    Tcl_InitHashTable(&table, TCL_ONE_WORD_KEYS);
    TkWmStackorderToplevelWrapperMap(parentPtr, &table);

    window_ptr = windows = (TkWindow **) ckalloc((table.numEntries+1)
        * sizeof(TkWindow *));

    /*
     * Special cases: If zero or one toplevels were mapped
     * there is no need to call XQueryTree.
     */

    switch (table.numEntries) {
    case 0:
        windows[0] = NULL;
        goto done;
    case 1:
        hPtr = Tcl_FirstHashEntry(&table, &search);
        windows[0] = (TkWindow *) Tcl_GetHashValue(hPtr);
        windows[1] = NULL;
        goto done;
    }

    vRoot = parentPtr->wmInfoPtr->vRoot;
    if (vRoot == None) {
        vRoot = RootWindowOfScreen(Tk_Screen((Tk_Window) parentPtr));
    }

    if (XQueryTree(parentPtr->display, vRoot, &dummy1, &dummy2,
            &children, &numChildren) == 0) {
        ckfree((char *) windows);
        windows = NULL;
    } else {
        for (i = 0; i < numChildren; i++) {
            hPtr = Tcl_FindHashEntry(&table, (char *) children[i]);
            if (hPtr != NULL) {
                childWinPtr = (TkWindow *) Tcl_GetHashValue(hPtr);
                *window_ptr++ = childWinPtr;
            }
        }
        if ((window_ptr - windows) != table.numEntries)
            panic("num matched toplevel windows does not equal num children");
        *window_ptr = NULL;
      if (numChildren) {
          XFree((char *) children);
      }
    }

    done:
    Tcl_DeleteHashTable(&table);
    return windows;
}

/*
 *----------------------------------------------------------------------
 *
 * TkWmRestackToplevel --
 *
 *    This procedure restacks a top-level window.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    WinPtr gets restacked  as specified by aboveBelow and otherPtr.
 *
 *----------------------------------------------------------------------
 */

void
TkWmRestackToplevel(winPtr, aboveBelow, otherPtr)
    TkWindow *winPtr;         /* Window to restack. */
    int aboveBelow;           /* Gives relative position for restacking;
                         * must be Above or Below. */
    TkWindow *otherPtr;       /* Window relative to which to restack;
                         * if NULL, then winPtr gets restacked
                         * above or below *all* siblings. */
{
    XWindowChanges changes;
    unsigned int mask;
    TkWindow *wrapperPtr;

    memset(&changes, 0, sizeof(XWindowChanges));
    changes.stack_mode = aboveBelow;
    mask = CWStackMode;

    /*
     * Make sure that winPtr and its wrapper window have been created.
     */
    if (winPtr->wmInfoPtr->flags & WM_NEVER_MAPPED) {
      TkWmMapWindow(winPtr);
    }
    wrapperPtr = winPtr->wmInfoPtr->wrapperPtr;

    if (otherPtr != NULL) {
      /*
       * The window is to be restacked with respect to another toplevel.
       * Make sure it has been created as well.
       */
      if (otherPtr->wmInfoPtr->flags & WM_NEVER_MAPPED) {
          TkWmMapWindow(otherPtr);
      }
      changes.sibling = otherPtr->wmInfoPtr->wrapperPtr->window;
      mask |= CWSibling;
    }

    /*
     * Reconfigure the window.  Note that we use XReconfigureWMWindow
     * instead of XConfigureWindow, in order to handle the case
     * where the window is to be restacked with respect to another toplevel.  
     * See [ICCCM] 4.1.5 "Configuring the Window" and XReconfigureWMWindow(3)
     * for details.
     */

    XReconfigureWMWindow(winPtr->display, wrapperPtr->window,
          Tk_ScreenNumber((Tk_Window) winPtr), mask,  &changes);
}


/*
 *----------------------------------------------------------------------
 *
 * TkWmAddToColormapWindows --
 *
 *    This procedure is called to add a given window to the
 *    WM_COLORMAP_WINDOWS property for its top-level, if it
 *    isn't already there.  It is invoked by the Tk code that
 *    creates a new colormap, in order to make sure that colormap
 *    information is propagated to the window manager by default.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    WinPtr's window gets added to the WM_COLORMAP_WINDOWS
 *    property of its nearest top-level ancestor, unless the
 *    colormaps have been set explicitly with the
 *    "wm colormapwindows" command.
 *
 *----------------------------------------------------------------------
 */

void
TkWmAddToColormapWindows(winPtr)
    TkWindow *winPtr;         /* Window with a non-default colormap.
                         * Should not be a top-level window. */
{
    TkWindow *wrapperPtr;
    TkWindow *topPtr;
    Window *oldPtr, *newPtr;
    int count, i;

    if (winPtr->window == None) {
      return;
    }

    for (topPtr = winPtr->parentPtr; ; topPtr = topPtr->parentPtr) {
      if (topPtr == NULL) {
          /*
           * Window is being deleted.  Skip the whole operation.
           */

          return;
      }
      if (topPtr->flags & TK_TOP_HIERARCHY) {
          break;
      }
    }
    if (topPtr->wmInfoPtr == NULL) {
      return;
    }

    if (topPtr->wmInfoPtr->flags & WM_COLORMAPS_EXPLICIT) {
      return;
    }
    if (topPtr->wmInfoPtr->wrapperPtr == NULL) {
      CreateWrapper(topPtr->wmInfoPtr);
    }
    wrapperPtr = topPtr->wmInfoPtr->wrapperPtr;

    /*
     * Fetch the old value of the property.
     */

    if (XGetWMColormapWindows(topPtr->display, wrapperPtr->window,
          &oldPtr, &count) == 0) {
      oldPtr = NULL;
      count = 0;
    }

    /*
     * Make sure that the window isn't already in the list.
     */

    for (i = 0; i < count; i++) {
      if (oldPtr[i] == winPtr->window) {
          return;
      }
    }

    /*
     * Make a new bigger array and use it to reset the property.
     * Automatically add the toplevel itself as the last element
     * of the list.
     */

    newPtr = (Window *) ckalloc((unsigned) ((count+2)*sizeof(Window)));
    for (i = 0; i < count; i++) {
      newPtr[i] = oldPtr[i];
    }
    if (count == 0) {
      count++;
    }
    newPtr[count-1] = winPtr->window;
    newPtr[count] = topPtr->window;
    XSetWMColormapWindows(topPtr->display, wrapperPtr->window, newPtr,
          count+1);
    ckfree((char *) newPtr);
    if (oldPtr != NULL) {
      XFree((char *) oldPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TkWmRemoveFromColormapWindows --
 *
 *    This procedure is called to remove a given window from the
 *    WM_COLORMAP_WINDOWS property for its top-level.  It is invoked
 *    when windows are deleted.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    WinPtr's window gets removed from the WM_COLORMAP_WINDOWS
 *    property of its nearest top-level ancestor, unless the
 *    top-level itself is being deleted too.
 *
 *----------------------------------------------------------------------
 */

void
TkWmRemoveFromColormapWindows(winPtr)
    TkWindow *winPtr;         /* Window that may be present in
                         * WM_COLORMAP_WINDOWS property for its
                         * top-level.  Should not be a top-level
                         * window. */
{
    TkWindow *wrapperPtr;
    TkWindow *topPtr;
    Window *oldPtr;
    int count, i, j;

    if (winPtr->window == None) {
      return;
    }

    for (topPtr = winPtr->parentPtr; ; topPtr = topPtr->parentPtr) {
      if (topPtr == NULL) {
          /*
           * Ancestors have been deleted, so skip the whole operation.
           * Seems like this can't ever happen?
           */

          return;
      }
      if (topPtr->flags & TK_TOP_HIERARCHY) {
          break;
      }
    }
    if (topPtr->flags & TK_ALREADY_DEAD) {
      /*
       * Top-level is being deleted, so there's no need to cleanup
       * the WM_COLORMAP_WINDOWS property.
       */

      return;
    }
    if (topPtr->wmInfoPtr == NULL) {
      return;
    }

    if (topPtr->wmInfoPtr->wrapperPtr == NULL) {
      CreateWrapper(topPtr->wmInfoPtr);
    }
    wrapperPtr = topPtr->wmInfoPtr->wrapperPtr;
    if (wrapperPtr == NULL) {
      return;
    }

    /*
     * Fetch the old value of the property.
     */

    if (XGetWMColormapWindows(topPtr->display, wrapperPtr->window,
          &oldPtr, &count) == 0) {
      return;
    }

    /*
     * Find the window and slide the following ones down to cover
     * it up.
     */

    for (i = 0; i < count; i++) {
      if (oldPtr[i] == winPtr->window) {
          for (j = i ; j < count-1; j++) {
            oldPtr[j] = oldPtr[j+1];
          }
          XSetWMColormapWindows(topPtr->display, wrapperPtr->window,
                oldPtr, count-1);
          break;
      }
    }
    XFree((char *) oldPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TkGetPointerCoords --
 *
 *    Fetch the position of the mouse pointer.
 *
 * Results:
 *    *xPtr and *yPtr are filled in with the (virtual) root coordinates
 *    of the mouse pointer for tkwin's display.  If the pointer isn't
 *    on tkwin's screen, then -1 values are returned for both
 *    coordinates.  The argument tkwin must be a toplevel window.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

void
TkGetPointerCoords(tkwin, xPtr, yPtr)
    Tk_Window tkwin;          /* Toplevel window that identifies screen
                         * on which lookup is to be done. */
    int *xPtr, *yPtr;         /* Store pointer coordinates here. */
{
    TkWindow *winPtr = (TkWindow *) tkwin;
    WmInfo *wmPtr;
    Window w, root, child;
    int rootX, rootY;
    unsigned int mask;

    wmPtr = winPtr->wmInfoPtr;

    w = wmPtr->vRoot;
    if (w == None) {
      w = RootWindow(winPtr->display, winPtr->screenNum);
    }
    if (XQueryPointer(winPtr->display, w, &root, &child, &rootX, &rootY,
          xPtr, yPtr, &mask) != True) {
      *xPtr = -1;
      *yPtr = -1;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * GetMaxSize --
 *
 *    This procedure computes the current maxWidth and maxHeight
 *    values for a window, taking into account the possibility
 *    that they may be defaulted.
 *
 * Results:
 *    The values at *maxWidthPtr and *maxHeightPtr are filled
 *    in with the maximum allowable dimensions of wmPtr's window,
 *    in grid units.  If no maximum has been specified for the
 *    window, then this procedure computes the largest sizes that
 *    will fit on the screen.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

static void
GetMaxSize(wmPtr, maxWidthPtr, maxHeightPtr)
    WmInfo *wmPtr;            /* Window manager information for the
                         * window. */
    int *maxWidthPtr;         /* Where to store the current maximum
                         * width of the window. */
    int *maxHeightPtr;        /* Where to store the current maximum
                         * height of the window. */
{
    int tmp;

    if (wmPtr->maxWidth > 0) {
      *maxWidthPtr = wmPtr->maxWidth;
    } else {
      /*
       * Must compute a default width.  Fill up the display, leaving a
       * bit of extra space for the window manager's borders.
       */

      tmp = DisplayWidth(wmPtr->winPtr->display, wmPtr->winPtr->screenNum)
          - 15;
      if (wmPtr->gridWin != NULL) {
          /*
           * Gridding is turned on;  convert from pixels to grid units.
           */

          tmp = wmPtr->reqGridWidth
                + (tmp - wmPtr->winPtr->reqWidth)/wmPtr->widthInc;
      }
      *maxWidthPtr = tmp;
    }
    if (wmPtr->maxHeight > 0) {
      *maxHeightPtr = wmPtr->maxHeight;
    } else {
      tmp = DisplayHeight(wmPtr->winPtr->display, wmPtr->winPtr->screenNum)
          - 30;
      if (wmPtr->gridWin != NULL) {
          tmp = wmPtr->reqGridHeight
                + (tmp - wmPtr->winPtr->reqHeight)/wmPtr->heightInc;
      }
      *maxHeightPtr = tmp;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TkpMakeMenuWindow --
 *
 *    Configure the window to be either a pull-down (or pop-up)
 *    menu, or as a toplevel (torn-off) menu or palette.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Changes the style bit used to create a new Mac toplevel.
 *
 *----------------------------------------------------------------------
 */

void
TkpMakeMenuWindow(tkwin, transient)
    Tk_Window tkwin;          /* New window. */
    int transient;            /* 1 means menu is only posted briefly as
                         * a popup or pulldown or cascade.  0 means
                         * menu is always visible, e.g. as a torn-off
                         * menu.  Determines whether save_under and
                         * override_redirect should be set. */
{
    WmInfo *wmPtr;
    XSetWindowAttributes atts;
    TkWindow *wrapperPtr;

    if (!Tk_HasWrapper(tkwin)) {
      return;
    }
    wmPtr = ((TkWindow *) tkwin)->wmInfoPtr;
    if (wmPtr->wrapperPtr == NULL) {
      CreateWrapper(wmPtr);
    }
    wrapperPtr = wmPtr->wrapperPtr;
    if (transient) {
      atts.override_redirect = True;
      atts.save_under = True;
    } else {
      atts.override_redirect = False;
      atts.save_under = False;
    }

    /*
     * The override-redirect and save-under bits must be set on the
     * wrapper window in order to have the desired effect.  However,
     * also set the override-redirect bit on the window itself, so
     * that the "wm overrideredirect" command will see it.
     */

    if ((atts.override_redirect != Tk_Attributes(wrapperPtr)->override_redirect)
          || (atts.save_under != Tk_Attributes(wrapperPtr)->save_under)) {
      Tk_ChangeWindowAttributes((Tk_Window) wrapperPtr,
            CWOverrideRedirect|CWSaveUnder, &atts);
    }
    if (atts.override_redirect != Tk_Attributes(tkwin)->override_redirect) {
      Tk_ChangeWindowAttributes(tkwin, CWOverrideRedirect, &atts);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * CreateWrapper --
 *
 *    This procedure is invoked to create the wrapper window for a
 *    toplevel window.  It is called just before a toplevel is mapped
 *    for the first time.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The wrapper is created and the toplevel is reparented inside it.
 *
 *----------------------------------------------------------------------
 */

static void
CreateWrapper(wmPtr)
    WmInfo *wmPtr;            /* Window manager information for the
                         * window. */
{
    TkWindow *winPtr, *wrapperPtr;
    Window parent;
    Tcl_HashEntry *hPtr;
    int new;

    winPtr = wmPtr->winPtr;
    if (winPtr->window == None) {
      Tk_MakeWindowExist((Tk_Window) winPtr);
    }

    /*
     * The code below is copied from CreateTopLevelWindow,
     * Tk_MakeWindowExist, and TkpMakeWindow; The idea is to create an
     * "official" Tk window (so that we can get events on it), but to
     * hide the window outside the official Tk hierarchy so that it
     * isn't visible to the application.  See the comments for the other
     * procedures if you have questions about this code.
     */

    wmPtr->wrapperPtr = wrapperPtr = TkAllocWindow(winPtr->dispPtr,
          Tk_ScreenNumber((Tk_Window) winPtr), winPtr);
    wrapperPtr->dirtyAtts |= CWBorderPixel;

    /*
     * Tk doesn't normally select for StructureNotifyMask events because
     * the events are synthesized internally.  However, for wrapper
     * windows we need to know when the window manager modifies the
     * window configuration.  We also need to select on focus change
     * events; these are the only windows for which we care about focus
     * changes.
     */

    wrapperPtr->flags |= TK_WRAPPER;
    wrapperPtr->atts.event_mask |= StructureNotifyMask|FocusChangeMask;
    wrapperPtr->atts.override_redirect = winPtr->atts.override_redirect;
    if (winPtr->flags & TK_EMBEDDED) {
      parent = TkUnixContainerId(winPtr);
    } else {
      parent = XRootWindow(wrapperPtr->display, wrapperPtr->screenNum);
    }
    wrapperPtr->window = XCreateWindow(wrapperPtr->display,
          parent, wrapperPtr->changes.x, wrapperPtr->changes.y,
          (unsigned) wrapperPtr->changes.width,
          (unsigned) wrapperPtr->changes.height,
          (unsigned) wrapperPtr->changes.border_width, wrapperPtr->depth,
          InputOutput, wrapperPtr->visual,
          wrapperPtr->dirtyAtts|CWOverrideRedirect, &wrapperPtr->atts);
    hPtr = Tcl_CreateHashEntry(&wrapperPtr->dispPtr->winTable,
          (char *) wrapperPtr->window, &new);
    Tcl_SetHashValue(hPtr, wrapperPtr);
    wrapperPtr->mainPtr = winPtr->mainPtr;
    wrapperPtr->mainPtr->refCount++;
    wrapperPtr->dirtyAtts = 0;
    wrapperPtr->dirtyChanges = 0;
    wrapperPtr->wmInfoPtr = wmPtr;

    /*
     * Reparent the toplevel window inside the wrapper.
     */

    XReparentWindow(wrapperPtr->display, winPtr->window, wrapperPtr->window,
          0, 0);

    /*
     * Tk must monitor structure events for wrapper windows in order
     * to detect changes made by window managers such as resizing,
     * mapping, unmapping, etc..
     */

    Tk_CreateEventHandler((Tk_Window) wmPtr->wrapperPtr, StructureNotifyMask,
          WrapperEventProc, (ClientData) wmPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TkWmFocusToplevel --
 *
 *    This is a utility procedure invoked by focus-management code.
 *    The focus code responds to externally generated focus-related
 *    events on wrapper windows but ignores those events for any other
 *    windows.  This procedure determines whether a given window is a
 *    wrapper window and, if so, returns the toplevel window
 *    corresponding to the wrapper.
 *
 * Results:
 *    If winPtr is a wrapper window, returns a pointer to the
 *    corresponding toplevel window; otherwise returns NULL.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

TkWindow *
TkWmFocusToplevel(winPtr)
    TkWindow *winPtr;         /* Window that received a focus-related
                         * event. */
{
    if (!(winPtr->flags & TK_WRAPPER)) {
      return NULL;
    }
    return winPtr->wmInfoPtr->winPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * TkUnixSetMenubar --
 *
 *    This procedure is invoked by menu management code to specify the
 *    window to use as a menubar for a given toplevel window.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The window given by menubar will be mapped and positioned inside
 *    the wrapper for tkwin and above tkwin.  Menubar will
 *    automatically be resized to maintain the height specified by
 *    TkUnixSetMenuHeight the same width as tkwin.  Any previous
 *    menubar specified for tkwin will be unmapped and ignored from
 *    now on.
 *
 *----------------------------------------------------------------------
 */

void
TkUnixSetMenubar(tkwin, menubar)
    Tk_Window tkwin;          /* Token for toplevel window. */
    Tk_Window menubar;        /* Token for window that is to serve as
                         * menubar for tkwin.  Must not be a
                         * toplevel window.  If NULL, any
                         * existing menubar is canceled and the
                         * menu height is reset to 0. */
{
    WmInfo *wmPtr = ((TkWindow *) tkwin)->wmInfoPtr;
    Tk_Window parent;
    TkWindow *menubarPtr = (TkWindow *) menubar;

    if (wmPtr->menubar != NULL) {
      /*
       * There's already a menubar for this toplevel.  If it isn't the
       * same as the new menubar, unmap it so that it is out of the
       * way, and reparent it back to its original parent.
       */

      if (wmPtr->menubar == menubar) {
          return;
      }
      ((TkWindow *) wmPtr->menubar)->wmInfoPtr = NULL;
      ((TkWindow *) wmPtr->menubar)->flags &= ~TK_REPARENTED;
      Tk_UnmapWindow(wmPtr->menubar);
      parent = Tk_Parent(wmPtr->menubar);
      if (parent != NULL) {
          Tk_MakeWindowExist(parent);
          XReparentWindow(Tk_Display(wmPtr->menubar),
                Tk_WindowId(wmPtr->menubar), Tk_WindowId(parent), 0, 0);
      }
      Tk_DeleteEventHandler(wmPtr->menubar, StructureNotifyMask,
            MenubarDestroyProc, (ClientData) wmPtr->menubar);
      Tk_ManageGeometry(wmPtr->menubar, NULL, (ClientData) NULL);
    }

    wmPtr->menubar = menubar;
    if (menubar == NULL) {
      wmPtr->menuHeight = 0;
    } else {
      if ((menubarPtr->flags & TK_TOP_LEVEL)
           || (Tk_Screen(menubar) != Tk_Screen(tkwin))) {
          panic("TkUnixSetMenubar got bad menubar");
      }
      wmPtr->menuHeight = Tk_ReqHeight(menubar);
      if (wmPtr->menuHeight == 0) {
          wmPtr->menuHeight = 1;
      }
      Tk_MakeWindowExist(tkwin);
      Tk_MakeWindowExist(menubar);
      if (wmPtr->wrapperPtr == NULL) {
          CreateWrapper(wmPtr);
      }
      XReparentWindow(Tk_Display(menubar), Tk_WindowId(menubar),
            wmPtr->wrapperPtr->window, 0, 0);
      menubarPtr->wmInfoPtr = wmPtr;
      Tk_MoveResizeWindow(menubar, 0, 0, Tk_Width(tkwin), wmPtr->menuHeight);
      Tk_MapWindow(menubar);
      Tk_CreateEventHandler(menubar, StructureNotifyMask, MenubarDestroyProc,
            (ClientData) menubar);
      Tk_ManageGeometry(menubar, &menubarMgrType, (ClientData) wmPtr);
      menubarPtr->flags |= TK_REPARENTED;
    }
    wmPtr->flags |= WM_UPDATE_SIZE_HINTS;
    if (!(wmPtr->flags & (WM_UPDATE_PENDING|WM_NEVER_MAPPED))) {
      Tcl_DoWhenIdle(UpdateGeometryInfo, (ClientData) tkwin);
      wmPtr->flags |= WM_UPDATE_PENDING;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * MenubarDestroyProc --
 *
 *    This procedure is invoked by the event dispatcher whenever a
 *    menubar window is destroyed (it's also invoked for a few other
 *    kinds of events, but we ignore those).
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The association between the window and its toplevel is broken,
 *    so that the window is no longer considered to be a menubar.
 *
 *----------------------------------------------------------------------
 */

static void
MenubarDestroyProc(clientData, eventPtr)
    ClientData clientData;          /* TkWindow pointer for menubar. */
    XEvent *eventPtr;               /* Describes what just happened. */
{
    WmInfo *wmPtr;

    if (eventPtr->type != DestroyNotify) {
      return;
    }
    wmPtr = ((TkWindow *) clientData)->wmInfoPtr;
    wmPtr->menubar = NULL;
    wmPtr->menuHeight = 0;
    wmPtr->flags |= WM_UPDATE_SIZE_HINTS;
    if (!(wmPtr->flags & (WM_UPDATE_PENDING|WM_NEVER_MAPPED))) {
      Tcl_DoWhenIdle(UpdateGeometryInfo, (ClientData) wmPtr->winPtr);
      wmPtr->flags |= WM_UPDATE_PENDING;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * MenubarReqProc --
 *
 *    This procedure is invoked by the Tk geometry management code
 *    whenever a menubar calls Tk_GeometryRequest to request a new
 *    size.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

static void
MenubarReqProc(clientData, tkwin)
    ClientData clientData;    /* Pointer to the window manager
                         * information for tkwin's toplevel. */
    Tk_Window tkwin;          /* Handle for menubar window. */
{
    WmInfo *wmPtr = (WmInfo *) clientData;

    wmPtr->menuHeight = Tk_ReqHeight(tkwin);
    if (wmPtr->menuHeight <= 0) {
      wmPtr->menuHeight = 1;
    }
    wmPtr->flags |= WM_UPDATE_SIZE_HINTS;
    if (!(wmPtr->flags & (WM_UPDATE_PENDING|WM_NEVER_MAPPED))) {
      Tcl_DoWhenIdle(UpdateGeometryInfo, (ClientData) wmPtr->winPtr);
      wmPtr->flags |= WM_UPDATE_PENDING;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TkpGetWrapperWindow --
 *
 *    Given a toplevel window return the hidden wrapper window for
 *    the toplevel window if available.
 *
 * Results:
 *    The wrapper window.  NULL is we were not passed a toplevel
 *    window or the wrapper has yet to be created.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

TkWindow *
TkpGetWrapperWindow(winPtr)
    TkWindow *winPtr;         /* A toplevel window pointer. */
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;

    if ((winPtr == NULL) || (wmPtr == NULL)) {
      return NULL;
    }

    return wmPtr->wrapperPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * UpdateCommand --
 *
 *    Update the WM_COMMAND property, taking care to translate
 *    the command strings into the external encoding.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

static void
UpdateCommand(winPtr)
    TkWindow  *winPtr;
{
    register WmInfo *wmPtr = winPtr->wmInfoPtr;
    Tcl_DString cmds, ds;
    int i, *offsets;
    char **cmdArgv;

    /*
     * Translate the argv strings into the external encoding.  To avoid
     * allocating lots of memory, the strings are appended to a buffer
     * with nulls between each string.
     *
     * This code is tricky because we need to pass and array of pointers
     * to XSetCommand.  However, we can't compute the pointers as we go
     * because the DString buffer space could get reallocated.  So, store
     * offsets for each element as we go, then compute pointers from the
     * offsets once the entire DString is done.
     */

    cmdArgv = (char **) ckalloc(sizeof(char *) * wmPtr->cmdArgc);
    offsets = (int *) ckalloc( sizeof(int) * wmPtr->cmdArgc);
    Tcl_DStringInit(&cmds);
    for (i = 0; i < wmPtr->cmdArgc; i++) {
      Tcl_UtfToExternalDString(NULL, wmPtr->cmdArgv[i], -1, &ds);
      offsets[i] = Tcl_DStringLength(&cmds);
      Tcl_DStringAppend(&cmds, Tcl_DStringValue(&ds),
            Tcl_DStringLength(&ds)+1);
      Tcl_DStringFree(&ds);
    }
    cmdArgv[0] = Tcl_DStringValue(&cmds);
    for (i = 1; i < wmPtr->cmdArgc; i++) {
      cmdArgv[i] = cmdArgv[0] + offsets[i];
    }

    XSetCommand(winPtr->display, wmPtr->wrapperPtr->window,
          cmdArgv, wmPtr->cmdArgc);
    Tcl_DStringFree(&cmds);
    ckfree((char *) cmdArgv);
    ckfree((char *) offsets);
}

/*
 *----------------------------------------------------------------------
 *
 * TkpWmSetState --
 *
 *    Sets the window manager state for the wrapper window of a
 *    given toplevel window.
 *
 * Results:
 *    0 on error, 1 otherwise
 *
 * Side effects:
 *    May minimize, restore, or withdraw a window.
 *
 *----------------------------------------------------------------------
 */

int
TkpWmSetState(winPtr, state)
     TkWindow *winPtr;        /* Toplevel window to operate on. */
     int state;               /* One of IconicState, NormalState,
                         * or WithdrawnState. */
{
    WmInfo *wmPtr = winPtr->wmInfoPtr;

    if (state == WithdrawnState) {
        wmPtr->hints.initial_state = WithdrawnState;
        wmPtr->withdrawn = 1;
        if (wmPtr->flags & WM_NEVER_MAPPED) {
            return 1;
        }
        if (XWithdrawWindow(winPtr->display, wmPtr->wrapperPtr->window,
                winPtr->screenNum) == 0) {
            return 0;
        }
        WaitForMapNotify(winPtr, 0);
    } else if (state == NormalState) {
        wmPtr->hints.initial_state = NormalState;
        wmPtr->withdrawn = 0;
        if (wmPtr->flags & WM_NEVER_MAPPED) {
            return 1;
        }
        UpdateHints(winPtr);
        Tk_MapWindow((Tk_Window) winPtr);
    } else if (state == IconicState) {
        wmPtr->hints.initial_state = IconicState;
        if (wmPtr->flags & WM_NEVER_MAPPED) {
            return 1;
        }
        if (wmPtr->withdrawn) {
            UpdateHints(winPtr);
            Tk_MapWindow((Tk_Window) winPtr);
            wmPtr->withdrawn = 0;
        } else {
            if (XIconifyWindow(winPtr->display, wmPtr->wrapperPtr->window,
                    winPtr->screenNum) == 0) {
                return 0;
            }
            WaitForMapNotify(winPtr, 0);
        }
    }

    return 1;
}

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