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Sourcecode: saods9 version File versions

tkEntry.c

/* 
 * Entry.c --
 *
 *    This module implements entry and spinbox widgets for the Tk toolkit.
 *    An entry displays a string and allows the string to be edited.
 *    A spinbox expands on the entry by adding up/down buttons that control
 *    the value of the entry widget.
 *
 * Copyright (c) 1990-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 * Copyright (c) 2000 Ajuba Solutions.
 * Copyright (c) 2002 ActiveState Corporation.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tkEntry.c,v 1.1.1.1 2004/04/02 22:35:07 joye Exp $
 */

#include "tkInt.h"
#include "default.h"

enum EntryType {
    TK_ENTRY, TK_SPINBOX
};

/*
 * A data structure of the following type is kept for each Entry
 * widget managed by this file:
 */

typedef struct {
    Tk_Window tkwin;          /* Window that embodies the entry. NULL
                         * means that the window has been destroyed
                         * but the data structures haven't yet been
                         * cleaned up.*/
    Display *display;         /* Display containing widget.  Used, among
                         * other things, so that resources can be
                         * freed even after tkwin has gone away. */
    Tcl_Interp *interp;       /* Interpreter associated with entry. */
    Tcl_Command widgetCmd;    /* Token for entry's widget command. */
    Tk_OptionTable optionTable;     /* Table that defines configuration options
                         * available for this widget. */
    enum EntryType type;      /* Specialized type of Entry widget */

    /*
     * Fields that are set by widget commands other than "configure".
     */
     
    CONST char *string;       /* Pointer to storage for string;
                         * NULL-terminated;  malloc-ed. */
    int insertPos;            /* Character index before which next typed
                         * character will be inserted. */

    /*
     * Information about what's selected, if any.
     */

    int selectFirst;          /* Character index of first selected
                         * character (-1 means nothing selected. */
    int selectLast;           /* Character index just after last selected
                         * character (-1 means nothing selected. */
    int selectAnchor;         /* Fixed end of selection (i.e. "select to"
                         * operation will use this as one end of the
                         * selection). */

    /*
     * Information for scanning:
     */

    int scanMarkX;            /* X-position at which scan started (e.g.
                         * button was pressed here). */
    int scanMarkIndex;        /* Character index of character that was at
                         * left of window when scan started. */

    /*
     * Configuration settings that are updated by Tk_ConfigureWidget.
     */

    Tk_3DBorder normalBorder; /* Used for drawing border around whole
                         * window, plus used for background. */
    Tk_3DBorder disabledBorder;     /* Used for drawing  border around whole
                         * window in disabled state, plus used for
                         * background. */
    Tk_3DBorder readonlyBorder;     /* Used for drawing  border around whole
                         * window in readonly state, plus used for
                         * background. */
    int borderWidth;          /* Width of 3-D border around window. */
    Tk_Cursor cursor;         /* Current cursor for window, or None. */
    int exportSelection;      /* Non-zero means tie internal entry selection
                         * to X selection. */
    Tk_Font tkfont;           /* Information about text font, or NULL. */
    XColor *fgColorPtr;       /* Text color in normal mode. */
    XColor *dfgColorPtr;      /* Text color in disabled mode. */
    XColor *highlightBgColorPtr;/* Color for drawing traversal highlight
                         * area when highlight is off. */
    XColor *highlightColorPtr;      /* Color for drawing traversal highlight. */
    int highlightWidth;       /* Width in pixels of highlight to draw
                         * around widget when it has the focus.
                         * <= 0 means don't draw a highlight. */
    Tk_3DBorder insertBorder; /* Used to draw vertical bar for insertion
                         * cursor. */
    int insertBorderWidth;    /* Width of 3-D border around insert cursor. */
    int insertOffTime;        /* Number of milliseconds cursor should spend
                         * in "off" state for each blink. */
    int insertOnTime;         /* Number of milliseconds cursor should spend
                         * in "on" state for each blink. */
    int insertWidth;          /* Total width of insert cursor. */
    Tk_Justify justify;       /* Justification to use for text within
                         * window. */
    int relief;               /* 3-D effect: TK_RELIEF_RAISED, etc. */
    Tk_3DBorder selBorder;    /* Border and background for selected
                         * characters. */
    int selBorderWidth;       /* Width of border around selection. */
    XColor *selFgColorPtr;    /* Foreground color for selected text. */
    int state;                  /* Normal or disabled.  Entry is read-only
                         * when disabled. */
    char *textVarName;        /* Name of variable (malloc'ed) or NULL.
                         * If non-NULL, entry's string tracks the
                         * contents of this variable and vice versa. */
    char *takeFocus;          /* Value of -takefocus option;  not used in
                         * the C code, but used by keyboard traversal
                         * scripts.  Malloc'ed, but may be NULL. */
    int prefWidth;            /* Desired width of window, measured in
                         * average characters. */
    char *scrollCmd;          /* Command prefix for communicating with
                         * scrollbar(s).  Malloc'ed.  NULL means
                         * no command to issue. */
    char *showChar;           /* Value of -show option.  If non-NULL, first
                         * character is used for displaying all
                         * characters in entry.  Malloc'ed.
                         * This is only used by the Entry widget. */

    /*
     * Fields whose values are derived from the current values of the
     * configuration settings above.
     */

    CONST char *displayString;      /* String to use when displaying.  This may
                         * be a pointer to string, or a pointer to
                         * malloced memory with the same character
                         * length as string but whose characters
                         * are all equal to showChar. */
    int numBytes;       /* Length of string in bytes. */
    int numChars;       /* Length of string in characters.  Both
                         * string and displayString have the same
                         * character length, but may have different
                         * byte lengths due to being made from
                         * different UTF-8 characters. */
    int numDisplayBytes;      /* Length of displayString in bytes. */
    int inset;                /* Number of pixels on the left and right
                         * sides that are taken up by XPAD, borderWidth
                         * (if any), and highlightWidth (if any). */
    Tk_TextLayout textLayout; /* Cached text layout information. */
    int layoutX, layoutY;     /* Origin for layout. */
    int leftX;                /* X position at which character at leftIndex
                         * is drawn (varies depending on justify). */
    int leftIndex;            /* Character index of left-most character
                         * visible in window. */
    Tcl_TimerToken insertBlinkHandler;
                        /* Timer handler used to blink cursor on and
                         * off. */
    GC textGC;                /* For drawing normal text. */
    GC selTextGC;       /* For drawing selected text. */
    GC highlightGC;           /* For drawing traversal highlight. */
    int avgWidth;       /* Width of average character. */
    int xWidth;               /* Extra width to reserve for widget.
                         * Used by spinboxes for button space. */
    int flags;                /* Miscellaneous flags;  see below for
                         * definitions. */

    int validate;               /* Non-zero means try to validate */
    char *validateCmd;          /* Command prefix to use when invoking
                         * validate command.  NULL means don't
                         * invoke commands.  Malloc'ed. */
    char *invalidCmd;         /* Command called when a validation returns 0
                         * (successfully fails), defaults to {}. */

} Entry;

/*
 * A data structure of the following type is kept for each spinbox
 * widget managed by this file:
 */

typedef struct {
    Entry entry;        /* A pointer to the generic entry structure.
                         * This must be the first element of the
                         * Spinbox. */

    /*
     * Spinbox specific configuration settings.
     */

    Tk_3DBorder activeBorder; /* Used for drawing border around active
                         * buttons. */
    Tk_3DBorder buttonBorder; /* Used for drawing border around buttons. */
    Tk_Cursor bCursor;        /* cursor for buttons, or None. */
    int bdRelief;       /* 3-D effect: TK_RELIEF_RAISED, etc. */
    int buRelief;       /* 3-D effect: TK_RELIEF_RAISED, etc. */
    char *command;            /* Command to invoke for spin buttons.
                         * NULL means no command to issue. */

    /*
     * Spinbox specific fields for use with configuration settings above.
     */

    int wrap;                 /* whether to wrap around when spinning */

    int selElement;           /* currently selected control */
    int curElement;           /* currently mouseover control */

    int repeatDelay;          /* repeat delay */
    int repeatInterval;       /* repeat interval */

    double fromValue;         /* Value corresponding to left/top of dial */
    double toValue;           /* Value corresponding to right/bottom
                         * of dial */
    double increment;         /* If > 0, all values are rounded to an
                         * even multiple of this value. */
    char *formatBuf;          /* string into which to format value.
                         * Malloc'ed. */
    char *reqFormat;          /* Sprintf conversion specifier used for the
                         * value that the users requests. Malloc'ed. */
    char *valueFormat;        /* Sprintf conversion specifier used for
                         * the value. */
    char digitFormat[10];     /* Sprintf conversion specifier computed from
                         * digits and other information; used for
                         * the value. */

    char *valueStr;           /* Values List. Malloc'ed. */
    Tcl_Obj *listObj;         /* Pointer to the list object being used */
    int eIndex;               /* Holds the current index into elements */
    int nElements;            /* Holds the current count of elements */

} Spinbox;

/*
 * Assigned bits of "flags" fields of Entry structures, and what those
 * bits mean:
 *
 * REDRAW_PENDING:            Non-zero means a DoWhenIdle handler has
 *                      already been queued to redisplay the entry.
 * BORDER_NEEDED:       Non-zero means 3-D border must be redrawn
 *                      around window during redisplay.  Normally
 *                      only text portion needs to be redrawn.
 * CURSOR_ON:                 Non-zero means insert cursor is displayed at
 *                      present.  0 means it isn't displayed.
 * GOT_FOCUS:                 Non-zero means this window has the input
 *                      focus.
 * UPDATE_SCROLLBAR:          Non-zero means scrollbar should be updated
 *                      during next redisplay operation.
 * GOT_SELECTION:       Non-zero means we've claimed the selection.
 * ENTRY_DELETED:       This entry has been effectively destroyed.
 * VALIDATING:                Non-zero means we are in a validateCmd
 * VALIDATE_VAR:        Non-zero means we are attempting to validate
 *                      the entry's textvariable with validateCmd
 * VALIDATE_ABORT:            Non-zero if validatecommand signals an abort
 *                      for current procedure and make no changes
 * ENTRY_VAR_TRACED:          Non-zero if a var trace is set.
 */

#define REDRAW_PENDING        1
#define BORDER_NEEDED         2
#define CURSOR_ON       4
#define GOT_FOCUS       8
#define UPDATE_SCROLLBAR      0x10
#define GOT_SELECTION         0x20
#define ENTRY_DELETED           0x40
#define VALIDATING              0x80
#define VALIDATE_VAR            0x100
#define VALIDATE_ABORT          0x200
#define ENTRY_VAR_TRACED        0x400

/*
 * The following macro defines how many extra pixels to leave on each
 * side of the text in the entry.
 */

#define XPAD 1
#define YPAD 1

/*
 * A comparison function for double values.  For Spinboxes.
 */
#define MIN_DBL_VAL           1E-9
#define DOUBLES_EQ(d1, d2)    (fabs((d1) - (d2)) < MIN_DBL_VAL)

/*
 * The following enum is used to define a type for the -state option
 * of the Entry widget.  These values are used as indices into the 
 * string table below.
 */

enum state {
    STATE_DISABLED, STATE_NORMAL, STATE_READONLY
};

static char *stateStrings[] = {
    "disabled", "normal", "readonly", (char *) NULL
};

/*
 * Definitions for -validate option values:
 */

static char *validateStrings[] = {
    "all", "key", "focus", "focusin", "focusout", "none", (char *) NULL
};
enum validateType {
    VALIDATE_ALL, VALIDATE_KEY, VALIDATE_FOCUS,
    VALIDATE_FOCUSIN, VALIDATE_FOCUSOUT, VALIDATE_NONE,
    /*
     * These extra enums are for use with EntryValidateChange
     */
    VALIDATE_FORCED, VALIDATE_DELETE, VALIDATE_INSERT, VALIDATE_BUTTON
};
#define DEF_ENTRY_VALIDATE    "none"
#define DEF_ENTRY_INVALIDCMD  ""

/*
 * Information used for Entry objv parsing.
 */

static Tk_OptionSpec entryOptSpec[] = {
    {TK_OPTION_BORDER, "-background", "background", "Background",
      DEF_ENTRY_BG_COLOR, -1, Tk_Offset(Entry, normalBorder),
      0, (ClientData) DEF_ENTRY_BG_MONO, 0},
    {TK_OPTION_SYNONYM, "-bd", (char *) NULL, (char *) NULL,
      (char *) NULL, 0, -1, 0, (ClientData) "-borderwidth", 0},
    {TK_OPTION_SYNONYM, "-bg", (char *) NULL, (char *) NULL,
      (char *) NULL, 0, -1, 0, (ClientData) "-background", 0},
    {TK_OPTION_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
      DEF_ENTRY_BORDER_WIDTH, -1, Tk_Offset(Entry, borderWidth), 
        0, 0, 0},
    {TK_OPTION_CURSOR, "-cursor", "cursor", "Cursor",
      DEF_ENTRY_CURSOR, -1, Tk_Offset(Entry, cursor),
      TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_BORDER, "-disabledbackground", "disabledBackground",
       "DisabledBackground", DEF_ENTRY_DISABLED_BG_COLOR, -1,
       Tk_Offset(Entry, disabledBorder), TK_OPTION_NULL_OK,
       (ClientData) DEF_ENTRY_DISABLED_BG_MONO, 0},
    {TK_OPTION_COLOR, "-disabledforeground", "disabledForeground",
       "DisabledForeground", DEF_ENTRY_DISABLED_FG, -1,
       Tk_Offset(Entry, dfgColorPtr), TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_BOOLEAN, "-exportselection", "exportSelection",
        "ExportSelection", DEF_ENTRY_EXPORT_SELECTION, -1, 
        Tk_Offset(Entry, exportSelection), 0, 0, 0},
    {TK_OPTION_SYNONYM, "-fg", "foreground", (char *) NULL,
      (char *) NULL, 0, -1, 0, (ClientData) "-foreground", 0},
    {TK_OPTION_FONT, "-font", "font", "Font",
      DEF_ENTRY_FONT, -1, Tk_Offset(Entry, tkfont), 0, 0, 0},
    {TK_OPTION_COLOR, "-foreground", "foreground", "Foreground",
      DEF_ENTRY_FG, -1, Tk_Offset(Entry, fgColorPtr), 0, 
        0, 0},
    {TK_OPTION_COLOR, "-highlightbackground", "highlightBackground",
      "HighlightBackground", DEF_ENTRY_HIGHLIGHT_BG,
      -1, Tk_Offset(Entry, highlightBgColorPtr), 
        0, 0, 0},
    {TK_OPTION_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",
      DEF_ENTRY_HIGHLIGHT, -1, Tk_Offset(Entry, highlightColorPtr),
      0, 0, 0},
    {TK_OPTION_PIXELS, "-highlightthickness", "highlightThickness",
      "HighlightThickness", DEF_ENTRY_HIGHLIGHT_WIDTH, -1, 
      Tk_Offset(Entry, highlightWidth), 0, 0, 0},
    {TK_OPTION_BORDER, "-insertbackground", "insertBackground", "Foreground",
      DEF_ENTRY_INSERT_BG,
      -1, Tk_Offset(Entry, insertBorder), 
        0, 0, 0},
    {TK_OPTION_PIXELS, "-insertborderwidth", "insertBorderWidth", 
        "BorderWidth", DEF_ENTRY_INSERT_BD_COLOR, -1, 
        Tk_Offset(Entry, insertBorderWidth), 0, 
        (ClientData) DEF_ENTRY_INSERT_BD_MONO, 0},
    {TK_OPTION_INT, "-insertofftime", "insertOffTime", "OffTime",
        DEF_ENTRY_INSERT_OFF_TIME, -1, Tk_Offset(Entry, insertOffTime), 
        0, 0, 0},
    {TK_OPTION_INT, "-insertontime", "insertOnTime", "OnTime",
        DEF_ENTRY_INSERT_ON_TIME, -1, Tk_Offset(Entry, insertOnTime), 
        0, 0, 0},
    {TK_OPTION_PIXELS, "-insertwidth", "insertWidth", "InsertWidth",
      DEF_ENTRY_INSERT_WIDTH, -1, Tk_Offset(Entry, insertWidth), 
        0, 0, 0},
    {TK_OPTION_STRING, "-invalidcommand", "invalidCommand", "InvalidCommand",
      DEF_ENTRY_INVALIDCMD, -1, Tk_Offset(Entry, invalidCmd),
      TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_SYNONYM, "-invcmd", (char *) NULL, (char *) NULL,
      (char *) NULL, 0, -1, 0, (ClientData) "-invalidcommand", 0},
    {TK_OPTION_JUSTIFY, "-justify", "justify", "Justify",
      DEF_ENTRY_JUSTIFY, -1, Tk_Offset(Entry, justify), 0, 0, 0},
    {TK_OPTION_BORDER, "-readonlybackground", "readonlyBackground",
       "ReadonlyBackground", DEF_ENTRY_READONLY_BG_COLOR, -1,
       Tk_Offset(Entry, readonlyBorder), TK_OPTION_NULL_OK,
       (ClientData) DEF_ENTRY_READONLY_BG_MONO, 0},
    {TK_OPTION_RELIEF, "-relief", "relief", "Relief",
      DEF_ENTRY_RELIEF, -1, Tk_Offset(Entry, relief), 
        0, 0, 0},
    {TK_OPTION_BORDER, "-selectbackground", "selectBackground", "Foreground",
        DEF_ENTRY_SELECT_COLOR, -1, Tk_Offset(Entry, selBorder),
        0, (ClientData) DEF_ENTRY_SELECT_MONO, 0},
    {TK_OPTION_PIXELS, "-selectborderwidth", "selectBorderWidth", 
        "BorderWidth", DEF_ENTRY_SELECT_BD_COLOR, -1, 
        Tk_Offset(Entry, selBorderWidth), 
        0, (ClientData) DEF_ENTRY_SELECT_BD_MONO, 0},
    {TK_OPTION_COLOR, "-selectforeground", "selectForeground", "Background",
      DEF_ENTRY_SELECT_FG_COLOR, -1, Tk_Offset(Entry, selFgColorPtr),
      0, (ClientData) DEF_ENTRY_SELECT_FG_MONO, 0},
    {TK_OPTION_STRING, "-show", "show", "Show",
        DEF_ENTRY_SHOW, -1, Tk_Offset(Entry, showChar), 
        TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_STRING_TABLE, "-state", "state", "State",
      DEF_ENTRY_STATE, -1, Tk_Offset(Entry, state), 
        0, (ClientData) stateStrings, 0},
    {TK_OPTION_STRING, "-takefocus", "takeFocus", "TakeFocus",
      DEF_ENTRY_TAKE_FOCUS, -1, Tk_Offset(Entry, takeFocus), 
        TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_STRING, "-textvariable", "textVariable", "Variable",
      DEF_ENTRY_TEXT_VARIABLE, -1, Tk_Offset(Entry, textVarName),
      TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_STRING_TABLE, "-validate", "validate", "Validate",
       DEF_ENTRY_VALIDATE, -1, Tk_Offset(Entry, validate),
       0, (ClientData) validateStrings, 0},
    {TK_OPTION_STRING, "-validatecommand", "validateCommand", "ValidateCommand",
       (char *) NULL, -1, Tk_Offset(Entry, validateCmd),
       TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_SYNONYM, "-vcmd", (char *) NULL, (char *) NULL,
      (char *) NULL, 0, -1, 0, (ClientData) "-validatecommand", 0},
    {TK_OPTION_INT, "-width", "width", "Width",
      DEF_ENTRY_WIDTH, -1, Tk_Offset(Entry, prefWidth), 0, 0, 0},
    {TK_OPTION_STRING, "-xscrollcommand", "xScrollCommand", "ScrollCommand",
      DEF_ENTRY_SCROLL_COMMAND, -1, Tk_Offset(Entry, scrollCmd),
      TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_END, (char *) NULL, (char *) NULL, (char *) NULL,
      (char *) NULL, 0, -1, 0, 0, 0}
};

/*
 * Information used for Spinbox objv parsing.
 */

#define DEF_SPINBOX_REPEAT_DELAY    "400"
#define DEF_SPINBOX_REPEAT_INTERVAL "100"

#define DEF_SPINBOX_CMD             ""

#define DEF_SPINBOX_FROM            "0"
#define DEF_SPINBOX_TO              "0"
#define DEF_SPINBOX_INCREMENT       "1"
#define DEF_SPINBOX_FORMAT          ""

#define DEF_SPINBOX_VALUES          ""
#define DEF_SPINBOX_WRAP            "0"

static Tk_OptionSpec sbOptSpec[] = {
    {TK_OPTION_BORDER, "-activebackground", "activeBackground", "Background",
      DEF_BUTTON_ACTIVE_BG_COLOR, -1, Tk_Offset(Spinbox, activeBorder),
      0, (ClientData) DEF_BUTTON_ACTIVE_BG_MONO, 0},
    {TK_OPTION_BORDER, "-background", "background", "Background",
      DEF_ENTRY_BG_COLOR, -1, Tk_Offset(Entry, normalBorder),
      0, (ClientData) DEF_ENTRY_BG_MONO, 0},
    {TK_OPTION_SYNONYM, "-bd", (char *) NULL, (char *) NULL,
      (char *) NULL, 0, -1, 0, (ClientData) "-borderwidth", 0},
    {TK_OPTION_SYNONYM, "-bg", (char *) NULL, (char *) NULL,
      (char *) NULL, 0, -1, 0, (ClientData) "-background", 0},
    {TK_OPTION_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
      DEF_ENTRY_BORDER_WIDTH, -1, Tk_Offset(Entry, borderWidth), 
        0, 0, 0},
    {TK_OPTION_BORDER, "-buttonbackground", "Button.background", "Background",
      DEF_BUTTON_BG_COLOR, -1, Tk_Offset(Spinbox, buttonBorder),
      0, (ClientData) DEF_BUTTON_BG_MONO, 0},
    {TK_OPTION_CURSOR, "-buttoncursor", "Button.cursor", "Cursor",
      DEF_BUTTON_CURSOR, -1, Tk_Offset(Spinbox, bCursor),
      TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_RELIEF, "-buttondownrelief", "Button.relief", "Relief",
      DEF_BUTTON_RELIEF, -1, Tk_Offset(Spinbox, bdRelief),
        0, 0, 0},
    {TK_OPTION_RELIEF, "-buttonuprelief", "Button.relief", "Relief",
      DEF_BUTTON_RELIEF, -1, Tk_Offset(Spinbox, buRelief),
        0, 0, 0},
    {TK_OPTION_STRING, "-command", "command", "Command",
      DEF_SPINBOX_CMD, -1, Tk_Offset(Spinbox, command),
      TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_CURSOR, "-cursor", "cursor", "Cursor",
      DEF_ENTRY_CURSOR, -1, Tk_Offset(Entry, cursor),
      TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_BORDER, "-disabledbackground", "disabledBackground",
       "DisabledBackground", DEF_ENTRY_DISABLED_BG_COLOR, -1,
       Tk_Offset(Entry, disabledBorder), TK_OPTION_NULL_OK,
       (ClientData) DEF_ENTRY_DISABLED_BG_MONO, 0},
    {TK_OPTION_COLOR, "-disabledforeground", "disabledForeground",
       "DisabledForeground", DEF_ENTRY_DISABLED_FG, -1,
       Tk_Offset(Entry, dfgColorPtr), TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_BOOLEAN, "-exportselection", "exportSelection",
        "ExportSelection", DEF_ENTRY_EXPORT_SELECTION, -1, 
        Tk_Offset(Entry, exportSelection), 0, 0, 0},
    {TK_OPTION_SYNONYM, "-fg", "foreground", (char *) NULL,
      (char *) NULL, 0, -1, 0, (ClientData) "-foreground", 0},
    {TK_OPTION_FONT, "-font", "font", "Font",
      DEF_ENTRY_FONT, -1, Tk_Offset(Entry, tkfont), 0, 0, 0},
    {TK_OPTION_COLOR, "-foreground", "foreground", "Foreground",
      DEF_ENTRY_FG, -1, Tk_Offset(Entry, fgColorPtr), 0, 
        0, 0},
    {TK_OPTION_STRING, "-format", "format", "Format",
      DEF_SPINBOX_FORMAT, -1, Tk_Offset(Spinbox, reqFormat),
      TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_DOUBLE, "-from", "from", "From",
      DEF_SPINBOX_FROM, -1, Tk_Offset(Spinbox, fromValue), 0, 0, 0},
    {TK_OPTION_COLOR, "-highlightbackground", "highlightBackground",
      "HighlightBackground", DEF_ENTRY_HIGHLIGHT_BG,
      -1, Tk_Offset(Entry, highlightBgColorPtr), 
        0, 0, 0},
    {TK_OPTION_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",
      DEF_ENTRY_HIGHLIGHT, -1, Tk_Offset(Entry, highlightColorPtr),
      0, 0, 0},
    {TK_OPTION_PIXELS, "-highlightthickness", "highlightThickness",
      "HighlightThickness", DEF_ENTRY_HIGHLIGHT_WIDTH, -1, 
      Tk_Offset(Entry, highlightWidth), 0, 0, 0},
    {TK_OPTION_DOUBLE, "-increment", "increment", "Increment",
      DEF_SPINBOX_INCREMENT, -1, Tk_Offset(Spinbox, increment), 0, 0, 0},
    {TK_OPTION_BORDER, "-insertbackground", "insertBackground", "Foreground",
      DEF_ENTRY_INSERT_BG, -1, Tk_Offset(Entry, insertBorder), 
        0, 0, 0},
    {TK_OPTION_PIXELS, "-insertborderwidth", "insertBorderWidth", 
        "BorderWidth", DEF_ENTRY_INSERT_BD_COLOR, -1, 
        Tk_Offset(Entry, insertBorderWidth), 0, 
        (ClientData) DEF_ENTRY_INSERT_BD_MONO, 0},
    {TK_OPTION_INT, "-insertofftime", "insertOffTime", "OffTime",
        DEF_ENTRY_INSERT_OFF_TIME, -1, Tk_Offset(Entry, insertOffTime), 
        0, 0, 0},
    {TK_OPTION_INT, "-insertontime", "insertOnTime", "OnTime",
        DEF_ENTRY_INSERT_ON_TIME, -1, Tk_Offset(Entry, insertOnTime), 
        0, 0, 0},
    {TK_OPTION_PIXELS, "-insertwidth", "insertWidth", "InsertWidth",
      DEF_ENTRY_INSERT_WIDTH, -1, Tk_Offset(Entry, insertWidth), 
        0, 0, 0},
    {TK_OPTION_STRING, "-invalidcommand", "invalidCommand", "InvalidCommand",
      DEF_ENTRY_INVALIDCMD, -1, Tk_Offset(Entry, invalidCmd),
      TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_SYNONYM, "-invcmd", (char *) NULL, (char *) NULL,
      (char *) NULL, 0, -1, 0, (ClientData) "-invalidcommand", 0},
    {TK_OPTION_JUSTIFY, "-justify", "justify", "Justify",
      DEF_ENTRY_JUSTIFY, -1, Tk_Offset(Entry, justify), 0, 0, 0},
    {TK_OPTION_RELIEF, "-relief", "relief", "Relief",
      DEF_ENTRY_RELIEF, -1, Tk_Offset(Entry, relief), 
        0, 0, 0},
    {TK_OPTION_BORDER, "-readonlybackground", "readonlyBackground",
       "ReadonlyBackground", DEF_ENTRY_READONLY_BG_COLOR, -1,
       Tk_Offset(Entry, readonlyBorder), TK_OPTION_NULL_OK,
       (ClientData) DEF_ENTRY_READONLY_BG_MONO, 0},
    {TK_OPTION_INT, "-repeatdelay", "repeatDelay", "RepeatDelay",
        DEF_SPINBOX_REPEAT_DELAY, -1, Tk_Offset(Spinbox, repeatDelay), 
        0, 0, 0},
    {TK_OPTION_INT, "-repeatinterval", "repeatInterval", "RepeatInterval",
        DEF_SPINBOX_REPEAT_INTERVAL, -1, Tk_Offset(Spinbox, repeatInterval), 
        0, 0, 0},
    {TK_OPTION_BORDER, "-selectbackground", "selectBackground", "Foreground",
        DEF_ENTRY_SELECT_COLOR, -1, Tk_Offset(Entry, selBorder),
        0, (ClientData) DEF_ENTRY_SELECT_MONO, 0},
    {TK_OPTION_PIXELS, "-selectborderwidth", "selectBorderWidth", 
        "BorderWidth", DEF_ENTRY_SELECT_BD_COLOR, -1, 
        Tk_Offset(Entry, selBorderWidth), 
        0, (ClientData) DEF_ENTRY_SELECT_BD_MONO, 0},
    {TK_OPTION_COLOR, "-selectforeground", "selectForeground", "Background",
      DEF_ENTRY_SELECT_FG_COLOR, -1, Tk_Offset(Entry, selFgColorPtr),
      0, (ClientData) DEF_ENTRY_SELECT_FG_MONO, 0},
    {TK_OPTION_STRING_TABLE, "-state", "state", "State",
      DEF_ENTRY_STATE, -1, Tk_Offset(Entry, state), 
        0, (ClientData) stateStrings, 0},
    {TK_OPTION_STRING, "-takefocus", "takeFocus", "TakeFocus",
      DEF_ENTRY_TAKE_FOCUS, -1, Tk_Offset(Entry, takeFocus), 
        TK_CONFIG_NULL_OK, 0, 0},
    {TK_OPTION_STRING, "-textvariable", "textVariable", "Variable",
      DEF_ENTRY_TEXT_VARIABLE, -1, Tk_Offset(Entry, textVarName),
      TK_CONFIG_NULL_OK, 0, 0},
    {TK_OPTION_DOUBLE, "-to", "to", "To",
      DEF_SPINBOX_TO, -1, Tk_Offset(Spinbox, toValue), 0, 0, 0},
    {TK_OPTION_STRING_TABLE, "-validate", "validate", "Validate",
       DEF_ENTRY_VALIDATE, -1, Tk_Offset(Entry, validate),
       0, (ClientData) validateStrings, 0},
    {TK_OPTION_STRING, "-validatecommand", "validateCommand", "ValidateCommand",
       (char *) NULL, -1, Tk_Offset(Entry, validateCmd),
       TK_CONFIG_NULL_OK, 0, 0},
    {TK_OPTION_STRING, "-values", "values", "Values",
       DEF_SPINBOX_VALUES, -1, Tk_Offset(Spinbox, valueStr),
       TK_OPTION_NULL_OK, 0, 0},
    {TK_OPTION_SYNONYM, "-vcmd", (char *) NULL, (char *) NULL,
      (char *) NULL, 0, -1, 0, (ClientData) "-validatecommand", 0},
    {TK_OPTION_INT, "-width", "width", "Width",
      DEF_ENTRY_WIDTH, -1, Tk_Offset(Entry, prefWidth), 0, 0, 0},
    {TK_OPTION_BOOLEAN, "-wrap", "wrap", "Wrap",
      DEF_SPINBOX_WRAP, -1, Tk_Offset(Spinbox, wrap), 0, 0, 0},
    {TK_OPTION_STRING, "-xscrollcommand", "xScrollCommand", "ScrollCommand",
      DEF_ENTRY_SCROLL_COMMAND, -1, Tk_Offset(Entry, scrollCmd),
      TK_CONFIG_NULL_OK, 0, 0},
    {TK_OPTION_END, (char *) NULL, (char *) NULL, (char *) NULL,
      (char *) NULL, 0, -1, 0, 0, 0}
};

/*
 * The following tables define the entry widget commands (and sub-
 * commands) and map the indexes into the string tables into 
 * enumerated types used to dispatch the entry widget command.
 */

static CONST char *entryCmdNames[] = {
    "bbox", "cget", "configure", "delete", "get", "icursor", "index", 
    "insert", "scan", "selection", "validate", "xview", (char *) NULL
};

enum entryCmd {
    COMMAND_BBOX, COMMAND_CGET, COMMAND_CONFIGURE, COMMAND_DELETE, 
    COMMAND_GET, COMMAND_ICURSOR, COMMAND_INDEX, COMMAND_INSERT, 
    COMMAND_SCAN, COMMAND_SELECTION, COMMAND_VALIDATE, COMMAND_XVIEW
};

static CONST char *selCmdNames[] = {
    "adjust", "clear", "from", "present", "range", "to", (char *) NULL
};

enum selCmd {
    SELECTION_ADJUST, SELECTION_CLEAR, SELECTION_FROM,
    SELECTION_PRESENT, SELECTION_RANGE, SELECTION_TO
};

/*
 * The following tables define the spinbox widget commands (and sub-
 * commands) and map the indexes into the string tables into 
 * enumerated types used to dispatch the spinbox widget command.
 */

static CONST char *sbCmdNames[] = {
    "bbox", "cget", "configure", "delete", "get", "icursor", "identify",
    "index", "insert", "invoke", "scan", "selection", "set",
    "validate", "xview", (char *) NULL
};

enum sbCmd {
    SB_CMD_BBOX, SB_CMD_CGET, SB_CMD_CONFIGURE, SB_CMD_DELETE, 
    SB_CMD_GET, SB_CMD_ICURSOR, SB_CMD_IDENTIFY, SB_CMD_INDEX,
    SB_CMD_INSERT, SB_CMD_INVOKE, SB_CMD_SCAN, SB_CMD_SELECTION,
    SB_CMD_SET, SB_CMD_VALIDATE, SB_CMD_XVIEW
};

static CONST char *sbSelCmdNames[] = {
    "adjust", "clear", "element", "from", "present", "range", "to",
    (char *) NULL
};

enum sbselCmd {
    SB_SEL_ADJUST, SB_SEL_CLEAR, SB_SEL_ELEMENT, SB_SEL_FROM, 
    SB_SEL_PRESENT, SB_SEL_RANGE, SB_SEL_TO
};

/*
 * Extra for selection of elements
 */

static CONST char *selElementNames[] = {
    "none", "buttondown", "buttonup", (char *) NULL, "entry"
};
enum selelement {
    SEL_NONE, SEL_BUTTONDOWN, SEL_BUTTONUP, SEL_NULL, SEL_ENTRY
};

/*
 * Flags for GetEntryIndex procedure:
 */

#define ZERO_OK               1
#define LAST_PLUS_ONE_OK      2

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

static int        ConfigureEntry _ANSI_ARGS_((Tcl_Interp *interp,
                      Entry *entryPtr, int objc, 
                            Tcl_Obj *CONST objv[], int flags));
static void       DeleteChars _ANSI_ARGS_((Entry *entryPtr, int index,
                      int count));
static void       DestroyEntry _ANSI_ARGS_((char *memPtr));
static void       DisplayEntry _ANSI_ARGS_((ClientData clientData));
static void       EntryBlinkProc _ANSI_ARGS_((ClientData clientData));
static void       EntryCmdDeletedProc _ANSI_ARGS_((
                      ClientData clientData));
static void       EntryComputeGeometry _ANSI_ARGS_((Entry *entryPtr));
static void       EntryEventProc _ANSI_ARGS_((ClientData clientData,
                      XEvent *eventPtr));
static void       EntryFocusProc _ANSI_ARGS_ ((Entry *entryPtr,
                      int gotFocus));
static int        EntryFetchSelection _ANSI_ARGS_((ClientData clientData,
                      int offset, char *buffer, int maxBytes));
static void       EntryLostSelection _ANSI_ARGS_((
                      ClientData clientData));
static void       EventuallyRedraw _ANSI_ARGS_((Entry *entryPtr));
static void       EntryScanTo _ANSI_ARGS_((Entry *entryPtr, int y));
static void       EntrySetValue _ANSI_ARGS_((Entry *entryPtr,
                      CONST char *value));
static void       EntrySelectTo _ANSI_ARGS_((
                      Entry *entryPtr, int index));
static char *           EntryTextVarProc _ANSI_ARGS_((ClientData clientData,
                      Tcl_Interp *interp, CONST char *name1,
                      CONST char *name2, int flags));
static void       EntryUpdateScrollbar _ANSI_ARGS_((Entry *entryPtr));
static int        EntryValidate _ANSI_ARGS_((Entry *entryPtr,
                      char *cmd));
static int        EntryValidateChange _ANSI_ARGS_((Entry *entryPtr,
                      char *change, CONST char *new, int index,
                      int type));
static void       ExpandPercents _ANSI_ARGS_((Entry *entryPtr,
                      CONST char *before, char *change, CONST char *new,
                      int index, int type, Tcl_DString *dsPtr));
static void       EntryValueChanged _ANSI_ARGS_((Entry *entryPtr,
                      CONST char *newValue));
static void       EntryVisibleRange _ANSI_ARGS_((Entry *entryPtr,
                      double *firstPtr, double *lastPtr));
static int        EntryWidgetObjCmd _ANSI_ARGS_((ClientData clientData,
                      Tcl_Interp *interp, int objc, 
                      Tcl_Obj *CONST objv[]));
static void       EntryWorldChanged _ANSI_ARGS_((
                      ClientData instanceData));
static int        GetEntryIndex _ANSI_ARGS_((Tcl_Interp *interp,
                      Entry *entryPtr, char *string, int *indexPtr));
static void       InsertChars _ANSI_ARGS_((Entry *entryPtr, int index,
                      char *string));

/*
 * These forward declarations are the spinbox specific ones:
 */

static int        SpinboxWidgetObjCmd _ANSI_ARGS_((ClientData clientData,
                      Tcl_Interp *interp, int objc, 
                      Tcl_Obj *CONST objv[]));
static int        GetSpinboxElement _ANSI_ARGS_((Spinbox *sbPtr,
                      int x, int y));
static int        SpinboxInvoke _ANSI_ARGS_((Tcl_Interp *interp,
                      Spinbox *sbPtr, int element));
static int        ComputeFormat _ANSI_ARGS_((Spinbox *sbPtr));

/*
 * The structure below defines widget class behavior by means of procedures
 * that can be invoked from generic window code.
 */

static Tk_ClassProcs entryClass = {
    sizeof(Tk_ClassProcs),    /* size */
    EntryWorldChanged,        /* worldChangedProc */
};


/*
 *--------------------------------------------------------------
 *
 * Tk_EntryObjCmd --
 *
 *    This procedure is invoked to process the "entry" Tcl
 *    command.  See the user documentation for details on what
 *    it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *--------------------------------------------------------------
 */

int
Tk_EntryObjCmd(clientData, interp, objc, objv)
    ClientData clientData;    /* NULL. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];      /* Argument objects. */
{
    register Entry *entryPtr;
    Tk_OptionTable optionTable;
    Tk_Window tkwin;
    char *tmp;

    if (objc < 2) {
      Tcl_WrongNumArgs(interp, 1, objv, "pathName ?options?");
      return TCL_ERROR;
    }

    tkwin = Tk_CreateWindowFromPath(interp, Tk_MainWindow(interp),
            Tcl_GetString(objv[1]), (char *) NULL);
    if (tkwin == NULL) {
      return TCL_ERROR;
    }

    /*
     * Create the option table for this widget class.  If it has already
     * been created, Tk will return the cached value.
     */

    optionTable = Tk_CreateOptionTable(interp, entryOptSpec);

    /*
     * Initialize the fields of the structure that won't be initialized
     * by ConfigureEntry, or that ConfigureEntry requires to be
     * initialized already (e.g. resource pointers).  Only the non-NULL/0
     * data must be initialized as memset covers the rest.
     */

    entryPtr                  = (Entry *) ckalloc(sizeof(Entry));
    memset((VOID *) entryPtr, 0, sizeof(Entry));

    entryPtr->tkwin           = tkwin;
    entryPtr->display         = Tk_Display(tkwin);
    entryPtr->interp          = interp;
    entryPtr->widgetCmd       = Tcl_CreateObjCommand(interp,
          Tk_PathName(entryPtr->tkwin), EntryWidgetObjCmd,
          (ClientData) entryPtr, EntryCmdDeletedProc);
    entryPtr->optionTable     = optionTable;
    entryPtr->type            = TK_ENTRY;
    tmp                       = (char *) ckalloc(1);
    tmp[0]              = '\0';
    entryPtr->string          = tmp;
    entryPtr->selectFirst     = -1;
    entryPtr->selectLast      = -1;

    entryPtr->cursor          = None;
    entryPtr->exportSelection = 1;
    entryPtr->justify         = TK_JUSTIFY_LEFT;
    entryPtr->relief          = TK_RELIEF_FLAT;
    entryPtr->state           = STATE_NORMAL;
    entryPtr->displayString   = entryPtr->string;
    entryPtr->inset           = XPAD;
    entryPtr->textGC          = None;
    entryPtr->selTextGC       = None;
    entryPtr->highlightGC     = None;
    entryPtr->avgWidth        = 1;
    entryPtr->validate        = VALIDATE_NONE;

    /*
     * Keep a hold of the associated tkwin until we destroy the listbox,
     * otherwise Tk might free it while we still need it.
     */

    Tcl_Preserve((ClientData) entryPtr->tkwin);

    Tk_SetClass(entryPtr->tkwin, "Entry");
    Tk_SetClassProcs(entryPtr->tkwin, &entryClass, (ClientData) entryPtr);
    Tk_CreateEventHandler(entryPtr->tkwin,
          ExposureMask|StructureNotifyMask|FocusChangeMask,
          EntryEventProc, (ClientData) entryPtr);
    Tk_CreateSelHandler(entryPtr->tkwin, XA_PRIMARY, XA_STRING,
          EntryFetchSelection, (ClientData) entryPtr, XA_STRING);

    if ((Tk_InitOptions(interp, (char *) entryPtr, optionTable, tkwin)
          != TCL_OK) ||
          (ConfigureEntry(interp, entryPtr, objc-2, objv+2, 0) != TCL_OK)) {
      Tk_DestroyWindow(entryPtr->tkwin);
      return TCL_ERROR;
    }

    Tcl_SetResult(interp, Tk_PathName(entryPtr->tkwin), TCL_STATIC);
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * EntryWidgetObjCmd --
 *
 *    This procedure is invoked to process the Tcl command
 *    that corresponds to a widget managed by this module.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *--------------------------------------------------------------
 */

static int
EntryWidgetObjCmd(clientData, interp, objc, objv)
    ClientData clientData;    /* Information about entry widget. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    Entry *entryPtr = (Entry *) clientData;
    int cmdIndex, selIndex, result;
    Tcl_Obj *objPtr;

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

    /* 
     * Parse the widget command by looking up the second token in
     * the list of valid command names. 
     */

    result = Tcl_GetIndexFromObj(interp, objv[1], entryCmdNames,
          "option", 0, &cmdIndex);
    if (result != TCL_OK) {
      return result;
    }

    Tcl_Preserve((ClientData) entryPtr);
    switch ((enum entryCmd) cmdIndex) {
        case COMMAND_BBOX: {
          int index, x, y, width, height;
          char buf[TCL_INTEGER_SPACE * 4];

          if (objc != 3) {
              Tcl_WrongNumArgs(interp, 2, objv, "index");
            goto error;
          }
          if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), 
                    &index) != TCL_OK) {
              goto error;
          }
          if ((index == entryPtr->numChars) && (index > 0)) {
              index--;
          }
          Tk_CharBbox(entryPtr->textLayout, index, &x, &y, 
                    &width, &height);
          sprintf(buf, "%d %d %d %d", x + entryPtr->layoutX,
                y + entryPtr->layoutY, width, height);
          Tcl_SetResult(interp, buf, TCL_VOLATILE);
          break;
      } 
      
        case COMMAND_CGET: {
          if (objc != 3) {
              Tcl_WrongNumArgs(interp, 2, objv, "option");
            goto error;
          }
          
          objPtr = Tk_GetOptionValue(interp, (char *) entryPtr,
                entryPtr->optionTable, objv[2], entryPtr->tkwin);
          if (objPtr == NULL) {
             goto error;
          } else {
            Tcl_SetObjResult(interp, objPtr);
          }
          break;
      }

        case COMMAND_CONFIGURE: {
          if (objc <= 3) {
            objPtr = Tk_GetOptionInfo(interp, (char *) entryPtr,
                  entryPtr->optionTable,
                  (objc == 3) ? objv[2] : (Tcl_Obj *) NULL,
                  entryPtr->tkwin);
            if (objPtr == NULL) {
                goto error;
            } else {
                Tcl_SetObjResult(interp, objPtr);
            }
          } else {
            result = ConfigureEntry(interp, entryPtr, objc-2, objv+2, 0);
          }
          break;
      }

        case COMMAND_DELETE: {
          int first, last;

          if ((objc < 3) || (objc > 4)) {
              Tcl_WrongNumArgs(interp, 2, objv, "firstIndex ?lastIndex?");
            goto error;
          }
          if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), 
                    &first) != TCL_OK) {
              goto error;
          }
          if (objc == 3) {
              last = first + 1;
          } else {
              if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[3]), 
                        &last) != TCL_OK) {
                goto error;
            }
          }
          if ((last >= first) && (entryPtr->state == STATE_NORMAL)) {
              DeleteChars(entryPtr, first, last - first);
          }
          break;
      }

        case COMMAND_GET: {
          if (objc != 2) {
              Tcl_WrongNumArgs(interp, 2, objv, (char *) NULL);
            goto error;
          }
          Tcl_SetStringObj(Tcl_GetObjResult(interp), entryPtr->string, -1);
          break;
      }

        case COMMAND_ICURSOR: {
          if (objc != 3) {
              Tcl_WrongNumArgs(interp, 2, objv, "pos");
            goto error;
          }
          if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]),
                    &entryPtr->insertPos) != TCL_OK) {
              goto error;
          }
          EventuallyRedraw(entryPtr);
          break;
      }
      
        case COMMAND_INDEX: {
          int index;

          if (objc != 3) {
              Tcl_WrongNumArgs(interp, 2, objv, "string");
            goto error;
          }
          if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), 
                    &index) != TCL_OK) {
              goto error;
          }
          Tcl_SetObjResult(interp, Tcl_NewIntObj(index));
          break;
      }

        case COMMAND_INSERT: {
          int index;

          if (objc != 4) {
              Tcl_WrongNumArgs(interp, 2, objv, "index text");
            goto error;
          }
          if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), 
                    &index) != TCL_OK) {
              goto error;
          }
          if (entryPtr->state == STATE_NORMAL) {
              InsertChars(entryPtr, index, Tcl_GetString(objv[3]));
          }
          break;
      }

        case COMMAND_SCAN: {
          int x;
          char *minorCmd;

          if (objc != 4) {
              Tcl_WrongNumArgs(interp, 2, objv, "mark|dragto x");
            goto error;
          }
          if (Tcl_GetIntFromObj(interp, objv[3], &x) != TCL_OK) {
              goto error;
          }

          minorCmd = Tcl_GetString(objv[2]);
          if (minorCmd[0] == 'm' 
                    && (strncmp(minorCmd, "mark", strlen(minorCmd)) == 0)) {
              entryPtr->scanMarkX = x;
            entryPtr->scanMarkIndex = entryPtr->leftIndex;
          } else if ((minorCmd[0] == 'd')
            && (strncmp(minorCmd, "dragto", strlen(minorCmd)) == 0)) {
              EntryScanTo(entryPtr, x);
          } else {
              Tcl_AppendResult(interp, "bad scan option \"", 
                        Tcl_GetString(objv[2]), "\": must be mark or dragto", 
                        (char *) NULL);
            goto error;
          }
          break;
      }
          
      case COMMAND_SELECTION: {
          int index, index2;

          if (objc < 3) {
            Tcl_WrongNumArgs(interp, 2, objv, "option ?index?");
            goto error;
          }
          
          /* 
           * Parse the selection sub-command, using the command
           * table "selCmdNames" defined above.
           */
          
          result = Tcl_GetIndexFromObj(interp, objv[2], selCmdNames,
                "selection option", 0, &selIndex);
          if (result != TCL_OK) {
            goto error;
          }

          /*
           * Disabled entries don't allow the selection to be modified,
           * but 'selection present' must return a boolean.
           */

          if ((entryPtr->state == STATE_DISABLED)
                && (selIndex != SELECTION_PRESENT)) {
            goto done;
          }

          switch (selIndex) {
              case SELECTION_ADJUST: {
                if (objc != 4) {
                    Tcl_WrongNumArgs(interp, 3, objv, "index");
                  goto error;
                }
                if (GetEntryIndex(interp, entryPtr, 
                            Tcl_GetString(objv[3]), &index) != TCL_OK) {
                    goto error;
                }
                if (entryPtr->selectFirst >= 0) {
                    int half1, half2;
            
                  half1 = (entryPtr->selectFirst 
                          + entryPtr->selectLast)/2;
                  half2 = (entryPtr->selectFirst 
                        + entryPtr->selectLast + 1)/2;
                  if (index < half1) {
                      entryPtr->selectAnchor = entryPtr->selectLast;
                  } else if (index > half2) {
                      entryPtr->selectAnchor = entryPtr->selectFirst;
                  } else {
                    /*
                     * We're at about the halfway point in the 
                     * selection; just keep the existing anchor.
                     */
                  }
                }
                EntrySelectTo(entryPtr, index);
                break;
            }

              case SELECTION_CLEAR: {
                if (objc != 3) {
                    Tcl_WrongNumArgs(interp, 3, objv, (char *) NULL);
                  goto error;
                }
                if (entryPtr->selectFirst >= 0) {
                    entryPtr->selectFirst = -1;
                  entryPtr->selectLast = -1;
                  EventuallyRedraw(entryPtr);
                }
                goto done;
            }

              case SELECTION_FROM: {
                if (objc != 4) {
                    Tcl_WrongNumArgs(interp, 3, objv, "index");
                  goto error;
                }
                if (GetEntryIndex(interp, entryPtr, 
                            Tcl_GetString(objv[3]), &index) != TCL_OK) {
                    goto error;
                }
                entryPtr->selectAnchor = index;
                break;
            }

              case SELECTION_PRESENT: {
                if (objc != 3) {
                    Tcl_WrongNumArgs(interp, 3, objv, (char *) NULL);
                  goto error;
                }
                Tcl_SetObjResult(interp,
                      Tcl_NewBooleanObj((entryPtr->selectFirst >= 0)));
                goto done;
            }

              case SELECTION_RANGE: {
                if (objc != 5) {
                    Tcl_WrongNumArgs(interp, 3, objv, "start end");
                  goto error;
                }
                if (GetEntryIndex(interp, entryPtr, 
                            Tcl_GetString(objv[3]), &index) != TCL_OK) {
                    goto error;
                }
                if (GetEntryIndex(interp, entryPtr, 
                            Tcl_GetString(objv[4]),& index2) != TCL_OK) {
                    goto error;
                }
                if (index >= index2) {
                    entryPtr->selectFirst = -1;
                  entryPtr->selectLast = -1;
                } else {
                    entryPtr->selectFirst = index;
                  entryPtr->selectLast = index2;
                }
                if (!(entryPtr->flags & GOT_SELECTION)
                      && (entryPtr->exportSelection)) {
                    Tk_OwnSelection(entryPtr->tkwin, XA_PRIMARY, 
                          EntryLostSelection, (ClientData) entryPtr);
                  entryPtr->flags |= GOT_SELECTION;
                }
                EventuallyRedraw(entryPtr);
                break;
            }
            
              case SELECTION_TO: {
                if (objc != 4) {
                    Tcl_WrongNumArgs(interp, 3, objv, "index");
                  goto error;
                }
                if (GetEntryIndex(interp, entryPtr, 
                            Tcl_GetString(objv[3]), &index) != TCL_OK) {
                    goto error;
                }
                EntrySelectTo(entryPtr, index);
                break;
            }
          }
          break;
      }

        case COMMAND_VALIDATE: {
          int code;

          if (objc != 2) {
            Tcl_WrongNumArgs(interp, 2, objv, (char *) NULL);
            goto error;
          }
          selIndex = entryPtr->validate;
          entryPtr->validate = VALIDATE_ALL;
          code = EntryValidateChange(entryPtr, (char *) NULL,
                               entryPtr->string, -1, VALIDATE_FORCED);
          if (entryPtr->validate != VALIDATE_NONE) {
            entryPtr->validate = selIndex;
          }
          Tcl_SetObjResult(interp, Tcl_NewBooleanObj((code == TCL_OK)));
          break;
      }

        case COMMAND_XVIEW: {
          int index;

          if (objc == 2) {
              double first, last;
            char buf[TCL_DOUBLE_SPACE * 2];
          
            EntryVisibleRange(entryPtr, &first, &last);
            sprintf(buf, "%g %g", first, last);
            Tcl_SetResult(interp, buf, TCL_VOLATILE);
            goto done;
          } else if (objc == 3) {
              if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), 
                        &index) != TCL_OK) {
                goto error;
            }
          } else {
              double fraction;
            int count;

            index = entryPtr->leftIndex;
            switch (Tk_GetScrollInfoObj(interp, objc, objv, &fraction, 
                        &count)) {
                case TK_SCROLL_ERROR: {
                    goto error;
                }
                case TK_SCROLL_MOVETO: {
                    index = (int) ((fraction * entryPtr->numChars) + 0.5);
                  break;
                }
                case TK_SCROLL_PAGES: {
                    int charsPerPage;
                
                  charsPerPage = ((Tk_Width(entryPtr->tkwin)
                          - 2 * entryPtr->inset) 
                                / entryPtr->avgWidth) - 2;
                  if (charsPerPage < 1) {
                      charsPerPage = 1;
                  }
                  index += count * charsPerPage;
                  break;
                }
                case TK_SCROLL_UNITS: {
                    index += count;
                  break;
                }
            }
          }
          if (index >= entryPtr->numChars) {
              index = entryPtr->numChars - 1;
          }
          if (index < 0) {
              index = 0;
          }
          entryPtr->leftIndex = index;
          entryPtr->flags |= UPDATE_SCROLLBAR;
          EntryComputeGeometry(entryPtr);
          EventuallyRedraw(entryPtr);
          break;
      }
    }

    done:
    Tcl_Release((ClientData) entryPtr);
    return result;

    error:
    Tcl_Release((ClientData) entryPtr);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * DestroyEntry --
 *
 *    This procedure is invoked by Tcl_EventuallyFree or Tcl_Release
 *    to clean up the internal structure of an entry at a safe time
 *    (when no-one is using it anymore).
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Everything associated with the entry is freed up.
 *
 *----------------------------------------------------------------------
 */

static void
DestroyEntry(memPtr)
    char *memPtr;       /* Info about entry widget. */
{
    Entry *entryPtr = (Entry *) memPtr;

    /*
     * Free up all the stuff that requires special handling, then
     * let Tk_FreeOptions handle all the standard option-related
     * stuff.
     */

    ckfree((char *)entryPtr->string);
    if (entryPtr->textVarName != NULL) {
      Tcl_UntraceVar(entryPtr->interp, entryPtr->textVarName,
            TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
            EntryTextVarProc, (ClientData) entryPtr);
      entryPtr->flags &= ~ENTRY_VAR_TRACED;
    }
    if (entryPtr->textGC != None) {
      Tk_FreeGC(entryPtr->display, entryPtr->textGC);
    }
    if (entryPtr->selTextGC != None) {
      Tk_FreeGC(entryPtr->display, entryPtr->selTextGC);
    }
    Tcl_DeleteTimerHandler(entryPtr->insertBlinkHandler);
    if (entryPtr->displayString != entryPtr->string) {
      ckfree((char *)entryPtr->displayString);
    }
    if (entryPtr->type == TK_SPINBOX) {
      Spinbox *sbPtr = (Spinbox *) entryPtr;

      if (sbPtr->listObj != NULL) {
          Tcl_DecrRefCount(sbPtr->listObj);
          sbPtr->listObj = NULL;
      }
      if (sbPtr->formatBuf) {
          ckfree(sbPtr->formatBuf);
      }
    }
    Tk_FreeTextLayout(entryPtr->textLayout);
    Tk_FreeConfigOptions((char *) entryPtr, entryPtr->optionTable,
          entryPtr->tkwin);
    Tcl_Release((ClientData) entryPtr->tkwin);
    entryPtr->tkwin = NULL;

    ckfree((char *) entryPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * ConfigureEntry --
 *
 *    This procedure is called to process an argv/argc list, plus
 *    the Tk option database, in order to configure (or reconfigure)
 *    an entry widget.
 *
 * Results:
 *    The return value is a standard Tcl result.  If TCL_ERROR is
 *    returned, then the interp's result contains an error message.
 *
 * Side effects:
 *    Configuration information, such as colors, border width,
 *    etc. get set for entryPtr;  old resources get freed,
 *    if there were any.
 *
 *----------------------------------------------------------------------
 */

static int
ConfigureEntry(interp, entryPtr, objc, objv, flags)
    Tcl_Interp *interp;       /* Used for error reporting. */
    Entry *entryPtr;          /* Information about widget; may or may not
                         * already have values for some fields. */
    int objc;                 /* Number of valid entries in argv. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
    int flags;                /* Flags to pass to Tk_ConfigureWidget. */
{
    Tk_SavedOptions savedOptions;
    Tk_3DBorder border;
    Tcl_Obj *errorResult = NULL;
    Spinbox *sbPtr = (Spinbox *) entryPtr;      /* Only used when this widget
                                     * is of type TK_SPINBOX */
    char *oldValues = NULL;         /* lint initialization */
    char *oldFormat = NULL;         /* lint initialization */
    int error;
    int oldExport = 0;              /* lint initialization */
    int valuesChanged = 0;          /* lint initialization */
    double oldFrom = 0.0;           /* lint initialization */
    double oldTo = 0.0;             /* lint initialization */

    /*
     * Eliminate any existing trace on a variable monitored by the entry.
     */

    if ((entryPtr->textVarName != NULL)
          && (entryPtr->flags & ENTRY_VAR_TRACED)) {
      Tcl_UntraceVar(interp, entryPtr->textVarName, 
            TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
            EntryTextVarProc, (ClientData) entryPtr);
      entryPtr->flags &= ~ENTRY_VAR_TRACED;
    }

    /*
     * Store old values that we need to effect certain behavior if
     * they change value
     */
    oldExport           = entryPtr->exportSelection;
    if (entryPtr->type == TK_SPINBOX) {
      oldValues   = sbPtr->valueStr;
      oldFormat   = sbPtr->reqFormat;
      oldFrom           = sbPtr->fromValue;
      oldTo       = sbPtr->toValue;
    }

    for (error = 0; error <= 1; error++) {
      if (!error) {
          /*
           * First pass: set options to new values.
           */

          if (Tk_SetOptions(interp, (char *) entryPtr,
                entryPtr->optionTable, objc, objv,
                entryPtr->tkwin, &savedOptions, (int *) NULL) != TCL_OK) {
            continue;
          }
      } else {
          /*
           * Second pass: restore options to old values.
           */

          errorResult = Tcl_GetObjResult(interp);
          Tcl_IncrRefCount(errorResult);
          Tk_RestoreSavedOptions(&savedOptions);
      }

      /*
       * A few other options also need special processing, such as parsing
       * the geometry and setting the background from a 3-D border.
       */

      if ((entryPtr->state == STATE_DISABLED) &&
            (entryPtr->disabledBorder != NULL)) {
          border = entryPtr->disabledBorder;
      } else if ((entryPtr->state == STATE_READONLY) &&
            (entryPtr->readonlyBorder != NULL)) {
          border = entryPtr->readonlyBorder;
      } else {
          border = entryPtr->normalBorder;
      }
      Tk_SetBackgroundFromBorder(entryPtr->tkwin, border);

      if (entryPtr->insertWidth <= 0) {
          entryPtr->insertWidth = 2;
      }
      if (entryPtr->insertBorderWidth > entryPtr->insertWidth/2) {
          entryPtr->insertBorderWidth = entryPtr->insertWidth/2;
      }

      if (entryPtr->type == TK_SPINBOX) {
          if (sbPtr->fromValue > sbPtr->toValue) {
            Tcl_SetResult(interp,
                  "-to value must be greater than -from value",
                  TCL_VOLATILE);
            continue;
          }

          if (sbPtr->reqFormat && (oldFormat != sbPtr->reqFormat)) {
            /*
             * Make sure that the given format is somewhat correct, and
             * calculate the minimum space we'll need for the values as
             * strings.
             */
            int min, max;
            size_t formatLen, formatSpace = TCL_DOUBLE_SPACE;
            char fbuf[4], *fmt = sbPtr->reqFormat;

            formatLen = strlen(fmt);
            if ((fmt[0] != '%') || (fmt[formatLen-1] != 'f')) {
                badFormatOpt:
                Tcl_AppendResult(interp, "bad spinbox format specifier \"",
                      sbPtr->reqFormat, "\"", (char *) NULL);
                continue;
            }
            if ((sscanf(fmt, "%%%d.%d%[f]", &min, &max, fbuf) == 3)
                  && (max >= 0)) {
                formatSpace = min + max + 1;
            } else if (((sscanf(fmt, "%%.%d%[f]", &min, fbuf) == 2)
                  || (sscanf(fmt, "%%%d%[f]", &min, fbuf) == 2)
                  || (sscanf(fmt, "%%%d.%[f]", &min, fbuf) == 2))
                  && (min >= 0)) {
                formatSpace = min + 1;
            } else {
                goto badFormatOpt;
            }
            if (formatSpace < TCL_DOUBLE_SPACE) {
                formatSpace = TCL_DOUBLE_SPACE;
            }
            sbPtr->formatBuf = ckrealloc(sbPtr->formatBuf, formatSpace);
            /*
             * We perturb the value of oldFrom to allow us to go into
             * the branch below that will reformat the displayed value.
             */
            oldFrom = sbPtr->fromValue - 1;
          }

          /*
           * See if we have to rearrange our listObj data
           */
          if (oldValues != sbPtr->valueStr) {
            if (sbPtr->listObj != NULL) {
                Tcl_DecrRefCount(sbPtr->listObj);
            }
            sbPtr->listObj = NULL;
            if (sbPtr->valueStr != NULL) {
                Tcl_Obj *newObjPtr;
                int nelems;

                newObjPtr = Tcl_NewStringObj(sbPtr->valueStr, -1);
                if (Tcl_ListObjLength(interp, newObjPtr, &nelems)
                      != TCL_OK) {
                  valuesChanged = -1;
                  continue;
                }
                sbPtr->listObj = newObjPtr;
                Tcl_IncrRefCount(sbPtr->listObj);
                sbPtr->nElements = nelems;
                sbPtr->eIndex = 0;
                valuesChanged++;
            }
          }
      }

      /*
       * Restart the cursor timing sequence in case the on-time or 
       * off-time just changed.  Set validate temporarily to none,
       * so the configure doesn't cause it to be triggered.
       */

      if (entryPtr->flags & GOT_FOCUS) {
          int validate = entryPtr->validate;
          entryPtr->validate = VALIDATE_NONE;
          EntryFocusProc(entryPtr, 1);
          entryPtr->validate = validate;
      }

      /*
       * Claim the selection if we've suddenly started exporting it.
       */

      if (entryPtr->exportSelection && (!oldExport)
              && (entryPtr->selectFirst != -1)
              && !(entryPtr->flags & GOT_SELECTION)) {
          Tk_OwnSelection(entryPtr->tkwin, XA_PRIMARY, EntryLostSelection,
                (ClientData) entryPtr);
          entryPtr->flags |= GOT_SELECTION;
      }

      /*
       * Recompute the window's geometry and arrange for it to be
       * redisplayed.
       */

      Tk_SetInternalBorder(entryPtr->tkwin,
              entryPtr->borderWidth + entryPtr->highlightWidth);
      if (entryPtr->highlightWidth <= 0) {
          entryPtr->highlightWidth = 0;
      }
      entryPtr->inset = entryPtr->highlightWidth 
              + entryPtr->borderWidth + XPAD;
      break;
    }
    if (!error) {
      Tk_FreeSavedOptions(&savedOptions);
    }

    /*
     * If the entry is tied to the value of a variable, create the variable if
     * it doesn't exist, and set the entry's value from the variable's value.
     */

    if (entryPtr->textVarName != NULL) {
      CONST char *value;

      value = Tcl_GetVar(interp, entryPtr->textVarName, TCL_GLOBAL_ONLY);
      if (value == NULL) {
          EntryValueChanged(entryPtr, NULL);
      } else {
          EntrySetValue(entryPtr, value);
      }
    }

    if (entryPtr->type == TK_SPINBOX) {
      ComputeFormat(sbPtr);

      if (valuesChanged > 0) {
          Tcl_Obj *objPtr;

          /*
           * No check for error return, because there shouldn't be one
           * given the check for valid list above
           */
          Tcl_ListObjIndex(interp, sbPtr->listObj, 0, &objPtr);
          EntryValueChanged(entryPtr, Tcl_GetString(objPtr));
      } else if ((sbPtr->valueStr == NULL)
            && !DOUBLES_EQ(sbPtr->fromValue, sbPtr->toValue)
            && (!DOUBLES_EQ(sbPtr->fromValue, oldFrom)
                  || !DOUBLES_EQ(sbPtr->toValue, oldTo))) {
          /*
           * If the valueStr is empty and -from && -to are specified, check
           * to see if the current string is within the range.  If not,
           * it will be constrained to the nearest edge.  If the current
           * string isn't a double value, we set it to -from.
           */
          int code;
          double dvalue;

          code = Tcl_GetDouble(NULL, entryPtr->string, &dvalue);
          if (code != TCL_OK) {
            dvalue = sbPtr->fromValue;
          } else {
            if (dvalue > sbPtr->toValue) {
                dvalue = sbPtr->toValue;
            } else if (dvalue < sbPtr->fromValue) {
                dvalue = sbPtr->fromValue;
            }
          }
          sprintf(sbPtr->formatBuf, sbPtr->valueFormat, dvalue);
          EntryValueChanged(entryPtr, sbPtr->formatBuf);
      }
    }

    /*
     * Set up a trace on the variable's value after we've possibly
     * constrained the value according to new -from/-to values.
     */

    if ((entryPtr->textVarName != NULL)
          && !(entryPtr->flags & ENTRY_VAR_TRACED)) {
      Tcl_TraceVar(interp, entryPtr->textVarName,
            TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
            EntryTextVarProc, (ClientData) entryPtr);
      entryPtr->flags |= ENTRY_VAR_TRACED;
    }

    EntryWorldChanged((ClientData) entryPtr);
    if (error) {
        Tcl_SetObjResult(interp, errorResult);
      Tcl_DecrRefCount(errorResult);
      return TCL_ERROR;
    } else {
        return TCL_OK;
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * EntryWorldChanged --
 *
 *      This procedure is called when the world has changed in some
 *      way and the widget needs to recompute all its graphics contexts
 *    and determine its new geometry.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Entry will be relayed out and redisplayed.
 *
 *---------------------------------------------------------------------------
 */
 
static void
EntryWorldChanged(instanceData)
    ClientData instanceData;  /* Information about widget. */
{
    XGCValues gcValues;
    GC gc = None;
    unsigned long mask;
    Tk_3DBorder border;
    XColor *colorPtr;
    Entry *entryPtr = (Entry *) instanceData;

    entryPtr->avgWidth = Tk_TextWidth(entryPtr->tkfont, "0", 1);
    if (entryPtr->avgWidth == 0) {
      entryPtr->avgWidth = 1;
    }

    if (entryPtr->type == TK_SPINBOX) {
      /*
       * Compute the button width for a spinbox
       */

      entryPtr->xWidth = entryPtr->avgWidth + 2 * (1+XPAD);
      if (entryPtr->xWidth < 11) {
          entryPtr->xWidth = 11; /* we want a min visible size */
      }
    }

    /*
     * Default background and foreground are from the normal state.
     * In a disabled state, both of those may be overridden; in the readonly
     * state, the background may be overridden.
     */

    border  = entryPtr->normalBorder;
    colorPtr      = entryPtr->fgColorPtr;
    switch (entryPtr->state) {
      case STATE_DISABLED:
          if (entryPtr->disabledBorder != NULL) {
            border = entryPtr->disabledBorder;
          }
          if (entryPtr->dfgColorPtr != NULL) {
            colorPtr = entryPtr->dfgColorPtr;
          }
          break;
      case STATE_READONLY:
          if (entryPtr->readonlyBorder != NULL) {
            border = entryPtr->readonlyBorder;
          }
          break;
    }

    Tk_SetBackgroundFromBorder(entryPtr->tkwin, border);
    gcValues.foreground = colorPtr->pixel;
    gcValues.font = Tk_FontId(entryPtr->tkfont);
    gcValues.graphics_exposures = False;
    mask = GCForeground | GCFont | GCGraphicsExposures;
    gc = Tk_GetGC(entryPtr->tkwin, mask, &gcValues);
    if (entryPtr->textGC != None) {
      Tk_FreeGC(entryPtr->display, entryPtr->textGC);
    }
    entryPtr->textGC = gc;

    gcValues.foreground = entryPtr->selFgColorPtr->pixel;
    gcValues.font = Tk_FontId(entryPtr->tkfont);
    mask = GCForeground | GCFont;
    gc = Tk_GetGC(entryPtr->tkwin, mask, &gcValues);
    if (entryPtr->selTextGC != None) {
      Tk_FreeGC(entryPtr->display, entryPtr->selTextGC);
    }
    entryPtr->selTextGC = gc;

    /*
     * Recompute the window's geometry and arrange for it to be
     * redisplayed.
     */

    EntryComputeGeometry(entryPtr);
    entryPtr->flags |= UPDATE_SCROLLBAR;
    EventuallyRedraw(entryPtr);
}

/*
 *--------------------------------------------------------------
 *
 * DisplayEntry --
 *
 *    This procedure redraws the contents of an entry window.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Information appears on the screen.
 *
 *--------------------------------------------------------------
 */

static void
DisplayEntry(clientData)
    ClientData clientData;    /* Information about window. */
{
    Entry *entryPtr = (Entry *) clientData;
    Tk_Window tkwin = entryPtr->tkwin;
    int baseY, selStartX, selEndX, cursorX;
    int showSelection, xBound;
    Tk_FontMetrics fm;
    Pixmap pixmap;
    Tk_3DBorder border;

    entryPtr->flags &= ~REDRAW_PENDING;
    if ((entryPtr->flags & ENTRY_DELETED) || !Tk_IsMapped(tkwin)) {
      return;
    }

    Tk_GetFontMetrics(entryPtr->tkfont, &fm);

    /*
     * Update the scrollbar if that's needed.
     */

    if (entryPtr->flags & UPDATE_SCROLLBAR) {
      entryPtr->flags &= ~UPDATE_SCROLLBAR;

        /*
       * Preserve/Release because updating the scrollbar can have
       * the side-effect of destroying or unmapping the entry widget.
       */

      Tcl_Preserve((ClientData) entryPtr);
      EntryUpdateScrollbar(entryPtr);

      if ((entryPtr->flags & ENTRY_DELETED) || !Tk_IsMapped(tkwin)) {
          Tcl_Release((ClientData) entryPtr);
          return;
      }
      Tcl_Release((ClientData) entryPtr);
    }

    /*
     * In order to avoid screen flashes, this procedure redraws the
     * textual area of the entry into off-screen memory, then copies
     * it back on-screen in a single operation.  This means there's
     * no point in time where the on-screen image has been cleared.
     */

    pixmap = Tk_GetPixmap(entryPtr->display, Tk_WindowId(tkwin),
          Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin));

    /*
     * Compute x-coordinate of the pixel just after last visible
     * one, plus vertical position of baseline of text.
     */

    xBound = Tk_Width(tkwin) - entryPtr->inset - entryPtr->xWidth;
    baseY = (Tk_Height(tkwin) + fm.ascent - fm.descent) / 2;

    /*
     * On Windows and Mac, we need to hide the selection whenever we
     * don't have the focus.
     */

#ifdef ALWAYS_SHOW_SELECTION
    showSelection = 1;
#else
    showSelection = (entryPtr->flags & GOT_FOCUS);
#endif

    /*
     * Draw the background in three layers.  From bottom to top the
     * layers are:  normal background, selection background, and
     * insertion cursor background.
     */

    if ((entryPtr->state == STATE_DISABLED) &&
          (entryPtr->disabledBorder != NULL)) {
      border = entryPtr->disabledBorder;
    } else if ((entryPtr->state == STATE_READONLY) &&
          (entryPtr->readonlyBorder != NULL)) {
      border = entryPtr->readonlyBorder;
    } else {
      border = entryPtr->normalBorder;
    }
    Tk_Fill3DRectangle(tkwin, pixmap, border,
          0, 0, Tk_Width(tkwin), Tk_Height(tkwin), 0, TK_RELIEF_FLAT);

    if (showSelection && (entryPtr->state != STATE_DISABLED)
          && (entryPtr->selectLast > entryPtr->leftIndex)) {
      if (entryPtr->selectFirst <= entryPtr->leftIndex) {
          selStartX = entryPtr->leftX;
      } else {
          Tk_CharBbox(entryPtr->textLayout, entryPtr->selectFirst,
                &selStartX, NULL, NULL, NULL);
          selStartX += entryPtr->layoutX;
      }
      if ((selStartX - entryPtr->selBorderWidth) < xBound) {
          Tk_CharBbox(entryPtr->textLayout, entryPtr->selectLast,
                &selEndX, NULL, NULL, NULL);
          selEndX += entryPtr->layoutX;
          Tk_Fill3DRectangle(tkwin, pixmap, entryPtr->selBorder,
                selStartX - entryPtr->selBorderWidth,
                baseY - fm.ascent - entryPtr->selBorderWidth,
                (selEndX - selStartX) + 2*entryPtr->selBorderWidth,
                (fm.ascent + fm.descent) + 2*entryPtr->selBorderWidth,
                entryPtr->selBorderWidth, TK_RELIEF_RAISED);
      } 
    }

    /*
     * Draw a special background for the insertion cursor, overriding
     * even the selection background.  As a special hack to keep the
     * cursor visible when the insertion cursor color is the same as
     * the color for selected text (e.g., on mono displays), write
     * background in the cursor area (instead of nothing) when the
     * cursor isn't on.  Otherwise the selection would hide the cursor.
     */

    if ((entryPtr->state == STATE_NORMAL) && (entryPtr->flags & GOT_FOCUS)) {
      Tk_CharBbox(entryPtr->textLayout, entryPtr->insertPos, &cursorX, NULL,
            NULL, NULL);
      cursorX += entryPtr->layoutX;
      cursorX -= (entryPtr->insertWidth)/2;
      Tk_SetCaretPos(entryPtr->tkwin, cursorX, baseY - fm.ascent,
            fm.ascent + fm.descent);
      if (entryPtr->insertPos >= entryPtr->leftIndex) {
          if (cursorX < xBound) {
            if (entryPtr->flags & CURSOR_ON) {
                Tk_Fill3DRectangle(tkwin, pixmap, entryPtr->insertBorder,
                      cursorX, baseY - fm.ascent, entryPtr->insertWidth,
                      fm.ascent + fm.descent,
                      entryPtr->insertBorderWidth,
                      TK_RELIEF_RAISED);
            } else if (entryPtr->insertBorder == entryPtr->selBorder) {
                Tk_Fill3DRectangle(tkwin, pixmap, border,
                      cursorX, baseY - fm.ascent, entryPtr->insertWidth,
                      fm.ascent + fm.descent, 0, TK_RELIEF_FLAT);
            }
          }
      }
    }

    /*
     * Draw the text in two pieces:  first the unselected portion, then the
     * selected portion on top of it.
     */

    Tk_DrawTextLayout(entryPtr->display, pixmap, entryPtr->textGC,
          entryPtr->textLayout, entryPtr->layoutX, entryPtr->layoutY,
          entryPtr->leftIndex, entryPtr->numChars);

    if (showSelection && (entryPtr->state != STATE_DISABLED)
          && (entryPtr->selTextGC != entryPtr->textGC)
          && (entryPtr->selectFirst < entryPtr->selectLast)) {
      int selFirst;

      if (entryPtr->selectFirst < entryPtr->leftIndex) {
          selFirst = entryPtr->leftIndex;
      } else {
          selFirst = entryPtr->selectFirst;
      }
      Tk_DrawTextLayout(entryPtr->display, pixmap, entryPtr->selTextGC,
            entryPtr->textLayout, entryPtr->layoutX, entryPtr->layoutY,
            selFirst, entryPtr->selectLast);
    }

    if (entryPtr->type == TK_SPINBOX) {
      int startx, height, inset, pad, tHeight, xWidth;
      Spinbox *sbPtr = (Spinbox *) entryPtr;

      /*
       * Draw the spin button controls.
       */
      xWidth = entryPtr->xWidth;
      pad    = XPAD + 1;
      inset  = entryPtr->inset - XPAD;
      startx = Tk_Width(tkwin) - (xWidth + inset);
      height = (Tk_Height(tkwin) - 2*inset)/2;
#if 0
      Tk_Fill3DRectangle(tkwin, pixmap, sbPtr->buttonBorder,
            startx, inset, xWidth, height, 1, sbPtr->buRelief);
      Tk_Fill3DRectangle(tkwin, pixmap, sbPtr->buttonBorder,
            startx, inset+height, xWidth, height, 1, sbPtr->bdRelief);
#else
      Tk_Fill3DRectangle(tkwin, pixmap, sbPtr->buttonBorder,
            startx, inset, xWidth, height, 1,
            (sbPtr->selElement == SEL_BUTTONUP) ?
            TK_RELIEF_SUNKEN : TK_RELIEF_RAISED);
      Tk_Fill3DRectangle(tkwin, pixmap, sbPtr->buttonBorder,
            startx, inset+height, xWidth, height, 1,
            (sbPtr->selElement == SEL_BUTTONDOWN) ?
            TK_RELIEF_SUNKEN : TK_RELIEF_RAISED);
#endif
    
      xWidth -= 2*pad;
      /*
       * Only draw the triangles if we have enough display space
       */
      if ((xWidth > 1)) {
          XPoint points[3];
          int starty, space, offset;

          space = height - 2*pad;
          /*
           * Ensure width of triangle is odd to guarantee a sharp tip
           */
          if (!(xWidth % 2)) {
            xWidth++;
          }
          tHeight = (xWidth + 1) / 2;
          if (tHeight > space) {
            tHeight = space;
          }
          space   = (space - tHeight) / 2;
          startx += pad;
          starty  = inset + height - pad - space;
          offset  = (sbPtr->selElement == SEL_BUTTONUP);
          /*
           * The points are slightly different for the up and down arrows
           * because (for *.x), we need to account for a bug in the way
           * XFillPolygon draws triangles, and we want to shift
           * the arrows differently when allowing for depressed behavior.
           */
          points[0].x = startx + offset;
          points[0].y = starty + (offset ? 0 : -1);
          points[1].x = startx + xWidth/2 + offset;
          points[1].y = starty - tHeight + (offset ? 0 : -1);
          points[2].x = startx + xWidth + offset;
          points[2].y = points[0].y;
          XFillPolygon(entryPtr->display, pixmap, entryPtr->textGC,
                points, 3, Convex, CoordModeOrigin);

          starty = inset + height + pad + space;
          offset = (sbPtr->selElement == SEL_BUTTONDOWN);
          points[0].x = startx + 1 + offset;
          points[0].y = starty + (offset ? 1 : 0);
          points[1].x = startx + xWidth/2 + offset;
          points[1].y = starty + tHeight + (offset ? 0 : -1);
          points[2].x = startx - 1 + xWidth + offset;
          points[2].y = points[0].y;
          XFillPolygon(entryPtr->display, pixmap, entryPtr->textGC,
                points, 3, Convex, CoordModeOrigin);
      }
    }

    /*
     * Draw the border and focus highlight last, so they will overwrite
     * any text that extends past the viewable part of the window.
     */

    xBound = entryPtr->highlightWidth;
    if (entryPtr->relief != TK_RELIEF_FLAT) {
      Tk_Draw3DRectangle(tkwin, pixmap, border, xBound, xBound,
            Tk_Width(tkwin) - 2 * xBound,
            Tk_Height(tkwin) - 2 * xBound,
            entryPtr->borderWidth, entryPtr->relief);
    }
    if (xBound > 0) {
      GC fgGC, bgGC;

      bgGC = Tk_GCForColor(entryPtr->highlightBgColorPtr, pixmap);
      if (entryPtr->flags & GOT_FOCUS) {
          fgGC = Tk_GCForColor(entryPtr->highlightColorPtr, pixmap);
          TkpDrawHighlightBorder(tkwin, fgGC, bgGC, xBound, pixmap);
      } else {
          TkpDrawHighlightBorder(tkwin, bgGC, bgGC, xBound, pixmap);
      }
    }

    /*
     * Everything's been redisplayed;  now copy the pixmap onto the screen
     * and free up the pixmap.
     */

    XCopyArea(entryPtr->display, pixmap, Tk_WindowId(tkwin), entryPtr->textGC,
          0, 0, (unsigned) Tk_Width(tkwin), (unsigned) Tk_Height(tkwin),
          0, 0);
    Tk_FreePixmap(entryPtr->display, pixmap);
    entryPtr->flags &= ~BORDER_NEEDED;
}

/*
 *----------------------------------------------------------------------
 *
 * EntryComputeGeometry --
 *
 *    This procedure is invoked to recompute information about where
 *    in its window an entry's string will be displayed.  It also
 *    computes the requested size for the window.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The leftX and tabOrigin fields are recomputed for entryPtr,
 *    and leftIndex may be adjusted.  Tk_GeometryRequest is called
 *    to register the desired dimensions for the window.
 *
 *----------------------------------------------------------------------
 */

static void
EntryComputeGeometry(entryPtr)
    Entry *entryPtr;          /* Widget record for entry. */
{
    int totalLength, overflow, maxOffScreen, rightX;
    int height, width, i;
    Tk_FontMetrics fm;
    char *p;

    if (entryPtr->displayString != entryPtr->string) {
      ckfree((char *)entryPtr->displayString);
      entryPtr->displayString = entryPtr->string;
      entryPtr->numDisplayBytes = entryPtr->numBytes;
    }

    /*
     * If we're displaying a special character instead of the value of
     * the entry, recompute the displayString.
     */

    if (entryPtr->showChar != NULL) {
      Tcl_UniChar ch;
      char buf[TCL_UTF_MAX];
      int size;

      /*
       * Normalize the special character so we can safely duplicate it
       * in the display string.  If we didn't do this, then two malformed
       * characters might end up looking like one valid UTF character in
       * the resulting string.
       */

      Tcl_UtfToUniChar(entryPtr->showChar, &ch);
      size = Tcl_UniCharToUtf(ch, buf);

      entryPtr->numDisplayBytes = entryPtr->numChars * size;
      p = (char *) ckalloc((unsigned) (entryPtr->numDisplayBytes + 1));
      entryPtr->displayString = p;

      for (i = entryPtr->numChars; --i >= 0; ) {
          p += Tcl_UniCharToUtf(ch, p);
      }
      *p = '\0';
    }

    Tk_FreeTextLayout(entryPtr->textLayout);
    entryPtr->textLayout = Tk_ComputeTextLayout(entryPtr->tkfont,
          entryPtr->displayString, entryPtr->numChars, 0,
          entryPtr->justify, TK_IGNORE_NEWLINES, &totalLength, &height);

    entryPtr->layoutY = (Tk_Height(entryPtr->tkwin) - height) / 2;

    /*
     * Recompute where the leftmost character on the display will
     * be drawn (entryPtr->leftX) and adjust leftIndex if necessary
     * so that we don't let characters hang off the edge of the
     * window unless the entire window is full.
     */

    overflow = totalLength -
      (Tk_Width(entryPtr->tkwin) - 2*entryPtr->inset - entryPtr->xWidth);
    if (overflow <= 0) {
      entryPtr->leftIndex = 0;
      if (entryPtr->justify == TK_JUSTIFY_LEFT) {
          entryPtr->leftX = entryPtr->inset;
      } else if (entryPtr->justify == TK_JUSTIFY_RIGHT) {
          entryPtr->leftX = Tk_Width(entryPtr->tkwin) - entryPtr->inset
            - entryPtr->xWidth - totalLength;
      } else {
          entryPtr->leftX = (Tk_Width(entryPtr->tkwin)
                - entryPtr->xWidth - totalLength)/2;
      }
      entryPtr->layoutX = entryPtr->leftX;
    } else {
      /*
       * The whole string can't fit in the window.  Compute the
       * maximum number of characters that may be off-screen to
       * the left without leaving empty space on the right of the
       * window, then don't let leftIndex be any greater than that.
       */

      maxOffScreen = Tk_PointToChar(entryPtr->textLayout, overflow, 0);
      Tk_CharBbox(entryPtr->textLayout, maxOffScreen,
            &rightX, NULL, NULL, NULL);
      if (rightX < overflow) {
          maxOffScreen++;
      }
      if (entryPtr->leftIndex > maxOffScreen) {
          entryPtr->leftIndex = maxOffScreen;
      }
      Tk_CharBbox(entryPtr->textLayout, entryPtr->leftIndex, &rightX,
            NULL, NULL, NULL);
      entryPtr->leftX = entryPtr->inset;
      entryPtr->layoutX = entryPtr->leftX - rightX;
    }

    Tk_GetFontMetrics(entryPtr->tkfont, &fm);
    height = fm.linespace + 2*entryPtr->inset + 2*(YPAD-XPAD);
    if (entryPtr->prefWidth > 0) {
      width = entryPtr->prefWidth*entryPtr->avgWidth + 2*entryPtr->inset;
    } else {
      if (totalLength == 0) {
          width = entryPtr->avgWidth + 2*entryPtr->inset;
      } else {
          width = totalLength + 2*entryPtr->inset;
      }
    }

    /*
     * Add one extra length for the spin buttons
     */
    width += entryPtr->xWidth;

    Tk_GeometryRequest(entryPtr->tkwin, width, height);
}

/*
 *----------------------------------------------------------------------
 *
 * InsertChars --
 *
 *    Add new characters to an entry widget.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    New information gets added to entryPtr;  it will be redisplayed
 *    soon, but not necessarily immediately.
 *
 *----------------------------------------------------------------------
 */

static void
InsertChars(entryPtr, index, value)
    Entry *entryPtr;          /* Entry that is to get the new elements. */
    int index;                /* Add the new elements before this
                         * character index. */
    char *value;        /* New characters to add (NULL-terminated
                         * string). */
{
    int byteIndex, byteCount, oldChars, charsAdded, newByteCount;
    CONST char *string;
    char *new;

    string = entryPtr->string;
    byteIndex = Tcl_UtfAtIndex(string, index) - string;
    byteCount = strlen(value);
    if (byteCount == 0) {
      return;
    }

    newByteCount = entryPtr->numBytes + byteCount + 1;
    new = (char *) ckalloc((unsigned) newByteCount);
    memcpy(new, string, (size_t) byteIndex);
    strcpy(new + byteIndex, value);
    strcpy(new + byteIndex + byteCount, string + byteIndex);

    if ((entryPtr->validate == VALIDATE_KEY ||
       entryPtr->validate == VALIDATE_ALL) &&
      EntryValidateChange(entryPtr, value, new, index,
                      VALIDATE_INSERT) != TCL_OK) {
      ckfree(new);
      return;
    }

    ckfree((char *)string);
    entryPtr->string = new;

    /*
     * The following construction is used because inserting improperly
     * formed UTF-8 sequences between other improperly formed UTF-8
     * sequences could result in actually forming valid UTF-8 sequences;
     * the number of characters added may not be Tcl_NumUtfChars(string, -1),
     * because of context.  The actual number of characters added is how
     * many characters are in the string now minus the number that
     * used to be there.
     */

    oldChars = entryPtr->numChars;
    entryPtr->numChars = Tcl_NumUtfChars(new, -1);
    charsAdded = entryPtr->numChars - oldChars;
    entryPtr->numBytes += byteCount;

    if (entryPtr->displayString == string) {
      entryPtr->displayString = new;
      entryPtr->numDisplayBytes = entryPtr->numBytes;
    }

    /*
     * Inserting characters invalidates all indexes into the string.
     * Touch up the indexes so that they still refer to the same
     * characters (at new positions).  When updating the selection
     * end-points, don't include the new text in the selection unless
     * it was completely surrounded by the selection.
     */

    if (entryPtr->selectFirst >= index) {
      entryPtr->selectFirst += charsAdded;
    }
    if (entryPtr->selectLast > index) {
      entryPtr->selectLast += charsAdded;
    }
    if ((entryPtr->selectAnchor > index)
          || (entryPtr->selectFirst >= index)) {
      entryPtr->selectAnchor += charsAdded;
    }
    if (entryPtr->leftIndex > index) {
      entryPtr->leftIndex += charsAdded;
    }
    if (entryPtr->insertPos >= index) {
      entryPtr->insertPos += charsAdded;
    }
    EntryValueChanged(entryPtr, NULL);
}

/*
 *----------------------------------------------------------------------
 *
 * DeleteChars --
 *
 *    Remove one or more characters from an entry widget.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Memory gets freed, the entry gets modified and (eventually)
 *    redisplayed.
 *
 *----------------------------------------------------------------------
 */

static void
DeleteChars(entryPtr, index, count)
    Entry *entryPtr;          /* Entry widget to modify. */
    int index;                /* Index of first character to delete. */
    int count;                /* How many characters to delete. */
{
    int byteIndex, byteCount, newByteCount;
    CONST char *string;
    char *new, *todelete;

    if ((index + count) > entryPtr->numChars) {
      count = entryPtr->numChars - index;
    }
    if (count <= 0) {
      return;
    }

    string = entryPtr->string;
    byteIndex = Tcl_UtfAtIndex(string, index) - string;
    byteCount = Tcl_UtfAtIndex(string + byteIndex, count) - (string + byteIndex);

    newByteCount = entryPtr->numBytes + 1 - byteCount;
    new = (char *) ckalloc((unsigned) newByteCount);
    memcpy(new, string, (size_t) byteIndex);
    strcpy(new + byteIndex, string + byteIndex + byteCount);

    todelete = (char *) ckalloc((unsigned) (byteCount + 1));
    memcpy(todelete, string + byteIndex, (size_t) byteCount);
    todelete[byteCount] = '\0';

    if ((entryPtr->validate == VALIDATE_KEY ||
       entryPtr->validate == VALIDATE_ALL) &&
      EntryValidateChange(entryPtr, todelete, new, index,
                      VALIDATE_DELETE) != TCL_OK) {
      ckfree(new);
      ckfree(todelete);
      return;
    }

    ckfree(todelete);
    ckfree((char *)entryPtr->string);
    entryPtr->string = new;
    entryPtr->numChars -= count;
    entryPtr->numBytes -= byteCount;

    if (entryPtr->displayString == string) {
      entryPtr->displayString = new;
      entryPtr->numDisplayBytes = entryPtr->numBytes;
    }

    /*
     * Deleting characters results in the remaining characters being
     * renumbered.  Update the various indexes into the string to reflect
     * this change.
     */

    if (entryPtr->selectFirst >= index) {
      if (entryPtr->selectFirst >= (index + count)) {
          entryPtr->selectFirst -= count;
      } else {
          entryPtr->selectFirst = index;
      }
    }
    if (entryPtr->selectLast >= index) {
      if (entryPtr->selectLast >= (index + count)) {
          entryPtr->selectLast -= count;
      } else {
          entryPtr->selectLast = index;
      }
    }
    if (entryPtr->selectLast <= entryPtr->selectFirst) {
      entryPtr->selectFirst = -1;
      entryPtr->selectLast = -1;
    }
    if (entryPtr->selectAnchor >= index) {
      if (entryPtr->selectAnchor >= (index+count)) {
          entryPtr->selectAnchor -= count;
      } else {
          entryPtr->selectAnchor = index;
      }
    }
    if (entryPtr->leftIndex > index) {
      if (entryPtr->leftIndex >= (index + count)) {
          entryPtr->leftIndex -= count;
      } else {
          entryPtr->leftIndex = index;
      }
    }
    if (entryPtr->insertPos >= index) {
      if (entryPtr->insertPos >= (index + count)) {
          entryPtr->insertPos -= count;
      } else {
          entryPtr->insertPos = index;
      }
    }
    EntryValueChanged(entryPtr, NULL);
}

/*
 *----------------------------------------------------------------------
 *
 * EntryValueChanged --
 *
 *    This procedure is invoked when characters are inserted into
 *    an entry or deleted from it.  It updates the entry's associated
 *    variable, if there is one, and does other bookkeeping such
 *    as arranging for redisplay.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

static void
EntryValueChanged(entryPtr, newValue)
    Entry *entryPtr;          /* Entry whose value just changed. */
    CONST char *newValue;     /* If this value is not NULL, we first
                         * force the value of the entry to this */
{
    if (newValue != NULL) {
      EntrySetValue(entryPtr, newValue);
    }

    if (entryPtr->textVarName == NULL) {
      newValue = NULL;
    } else {
      newValue = Tcl_SetVar(entryPtr->interp, entryPtr->textVarName,
            entryPtr->string, TCL_GLOBAL_ONLY);
    }

    if ((newValue != NULL) && (strcmp(newValue, entryPtr->string) != 0)) {
      /*
       * The value of the variable is different than what we asked for.
       * This means that a trace on the variable modified it.  In this
       * case our trace procedure wasn't invoked since the modification
       * came while a trace was already active on the variable.  So,
       * update our value to reflect the variable's latest value.
       */

      EntrySetValue(entryPtr, newValue);
    } else {
      /*
       * Arrange for redisplay.
       */

      entryPtr->flags |= UPDATE_SCROLLBAR;
      EntryComputeGeometry(entryPtr);
      EventuallyRedraw(entryPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * EntrySetValue --
 *
 *    Replace the contents of a text entry with a given value.  This
 *    procedure is invoked when updating the entry from the entry's
 *    associated variable.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The string displayed in the entry will change.  The selection,
 *    insertion point, and view may have to be adjusted to keep them
 *    within the bounds of the new string.  Note: this procedure does
 *    *not* update the entry's associated variable, since that could
 *    result in an infinite loop.
 *
 *----------------------------------------------------------------------
 */

static void
EntrySetValue(entryPtr, value)
    Entry *entryPtr;          /* Entry whose value is to be changed. */
    CONST char *value;        /* New text to display in entry. */
{
    CONST char *oldSource;
    int valueLen, malloced = 0;

    if (strcmp(value, entryPtr->string) == 0) {
      return;
    }
    valueLen = strlen(value);

    if (entryPtr->flags & VALIDATE_VAR) {
      entryPtr->flags |= VALIDATE_ABORT;
    } else {
      /*
       * If we validate, we create a copy of the value, as it may
       * point to volatile memory, like the value of the -textvar
       * which may get freed during validation
       */
      char *tmp = (char *) ckalloc((unsigned) (valueLen + 1));
      strcpy(tmp, value);
      value = tmp;
      malloced = 1;

      entryPtr->flags |= VALIDATE_VAR;
      (void) EntryValidateChange(entryPtr, (char *) NULL, value, -1,
            VALIDATE_FORCED);
      entryPtr->flags &= ~VALIDATE_VAR;
      /*
       * If VALIDATE_ABORT has been set, then this operation should be
       * aborted because the validatecommand did something else instead
       */
      if (entryPtr->flags & VALIDATE_ABORT) {
          entryPtr->flags &= ~VALIDATE_ABORT;
          ckfree((char *)value);
          return;
      }
    }

    oldSource = entryPtr->string;
    ckfree((char *)entryPtr->string);

    if (malloced) {
      entryPtr->string = value;
    } else {
      char *tmp = (char *) ckalloc((unsigned) (valueLen + 1));
      strcpy(tmp, value);
      entryPtr->string = tmp;
    }
    entryPtr->numBytes = valueLen;
    entryPtr->numChars = Tcl_NumUtfChars(value, valueLen);

    if (entryPtr->displayString == oldSource) {
      entryPtr->displayString = entryPtr->string;
      entryPtr->numDisplayBytes = entryPtr->numBytes;
    }

    if (entryPtr->selectFirst >= 0) {
      if (entryPtr->selectFirst >= entryPtr->numChars) {
          entryPtr->selectFirst = -1;
          entryPtr->selectLast = -1;
      } else if (entryPtr->selectLast > entryPtr->numChars) {
          entryPtr->selectLast = entryPtr->numChars;
      }
    }
    if (entryPtr->leftIndex >= entryPtr->numChars) {
      if (entryPtr->numChars > 0) {
          entryPtr->leftIndex = entryPtr->numChars - 1;
      } else {
          entryPtr->leftIndex = 0;
      }
    }
    if (entryPtr->insertPos > entryPtr->numChars) {
      entryPtr->insertPos = entryPtr->numChars;
    }

    entryPtr->flags |= UPDATE_SCROLLBAR;
    EntryComputeGeometry(entryPtr);
    EventuallyRedraw(entryPtr);
}

/*
 *--------------------------------------------------------------
 *
 * EntryEventProc --
 *
 *    This procedure is invoked by the Tk dispatcher for various
 *    events on entries.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    When the window gets deleted, internal structures get
 *    cleaned up.  When it gets exposed, it is redisplayed.
 *
 *--------------------------------------------------------------
 */

static void
EntryEventProc(clientData, eventPtr)
    ClientData clientData;    /* Information about window. */
    XEvent *eventPtr;         /* Information about event. */
{
    Entry *entryPtr = (Entry *) clientData;

    if ((entryPtr->type == TK_SPINBOX) && (eventPtr->type == MotionNotify)) {
      Spinbox *sbPtr = (Spinbox *) clientData;
      int elem;

      elem = GetSpinboxElement(sbPtr, eventPtr->xmotion.x,
            eventPtr->xmotion.y);
      if (elem != sbPtr->curElement) {
          Tk_Cursor cursor;

          sbPtr->curElement = elem;
          if (elem == SEL_ENTRY) {
            cursor = entryPtr->cursor;
          } else if ((elem == SEL_BUTTONDOWN) || (elem == SEL_BUTTONUP)) {
            cursor = sbPtr->bCursor;
          } else {
            cursor = None;
          }
          if (cursor != None) {
            Tk_DefineCursor(entryPtr->tkwin, cursor);
          } else {
            Tk_UndefineCursor(entryPtr->tkwin);
          }
      }
      return;
    }

    switch (eventPtr->type) {
      case Expose:
          EventuallyRedraw(entryPtr);
          entryPtr->flags |= BORDER_NEEDED;
          break;
      case DestroyNotify:
          if (!(entryPtr->flags & ENTRY_DELETED)) {
            entryPtr->flags |= (ENTRY_DELETED | VALIDATE_ABORT);
            Tcl_DeleteCommandFromToken(entryPtr->interp,
                  entryPtr->widgetCmd);
            if (entryPtr->flags & REDRAW_PENDING) {
                Tcl_CancelIdleCall(DisplayEntry, clientData);
            }
            Tcl_EventuallyFree(clientData, DestroyEntry);
          }
          break;
      case ConfigureNotify:
          Tcl_Preserve((ClientData) entryPtr);
          entryPtr->flags |= UPDATE_SCROLLBAR;
          EntryComputeGeometry(entryPtr);
          EventuallyRedraw(entryPtr);
          Tcl_Release((ClientData) entryPtr);
          break;
      case FocusIn:
      case FocusOut:
          if (eventPtr->xfocus.detail != NotifyInferior) {
            EntryFocusProc(entryPtr, (eventPtr->type == FocusIn));
          }
          break;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * EntryCmdDeletedProc --
 *
 *    This procedure is invoked when a widget command is deleted.  If
 *    the widget isn't already in the process of being destroyed,
 *    this command destroys it.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The widget is destroyed.
 *
 *----------------------------------------------------------------------
 */

static void
EntryCmdDeletedProc(clientData)
    ClientData clientData;    /* Pointer to widget record for widget. */
{
    Entry *entryPtr = (Entry *) clientData;

    /*
     * This procedure could be invoked either because the window was
     * destroyed and the command was then deleted (in which case tkwin
     * is NULL) or because the command was deleted, and then this procedure
     * destroys the widget.
     */

    if (!(entryPtr->flags & ENTRY_DELETED)) {
        Tk_DestroyWindow(entryPtr->tkwin);
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * GetEntryIndex --
 *
 *    Parse an index into an entry and return either its value
 *    or an error.
 *
 * Results:
 *    A standard Tcl result.  If all went well, then *indexPtr is
 *    filled in with the character index (into entryPtr) corresponding to
 *    string.  The index value is guaranteed to lie between 0 and
 *    the number of characters in the string, inclusive.  If an
 *    error occurs then an error message is left in the interp's result.
 *
 * Side effects:
 *    None.
 *
 *---------------------------------------------------------------------------
 */

static int
GetEntryIndex(interp, entryPtr, string, indexPtr)
    Tcl_Interp *interp;       /* For error messages. */
    Entry *entryPtr;          /* Entry for which the index is being
                         * specified. */
    char *string;       /* Specifies character in entryPtr. */
    int *indexPtr;            /* Where to store converted character
                         * index. */
{
    size_t length;

    length = strlen(string);

    if (string[0] == 'a') {
      if (strncmp(string, "anchor", length) == 0) {
          *indexPtr = entryPtr->selectAnchor;
      } else {
          badIndex:

          /*
           * Some of the paths here leave messages in the interp's result,
           * so we have to clear it out before storing our own message.
           */

          Tcl_SetResult(interp, (char *) NULL, TCL_STATIC);
          Tcl_AppendResult(interp, "bad ",
                (entryPtr->type == TK_ENTRY) ? "entry" : "spinbox",
                " index \"", string, "\"", (char *) NULL);
          return TCL_ERROR;
      }
    } else if (string[0] == 'e') {
      if (strncmp(string, "end", length) == 0) {
          *indexPtr = entryPtr->numChars;
      } else {
          goto badIndex;
      }
    } else if (string[0] == 'i') {
      if (strncmp(string, "insert", length) == 0) {
          *indexPtr = entryPtr->insertPos;
      } else {
          goto badIndex;
      }
    } else if (string[0] == 's') {
      if (entryPtr->selectFirst < 0) {
          Tcl_SetResult(interp, (char *) NULL, TCL_STATIC);
          Tcl_AppendResult(interp, "selection isn't in widget ",
                Tk_PathName(entryPtr->tkwin), (char *) NULL);
          return TCL_ERROR;
      }
      if (length < 5) {
          goto badIndex;
      }
      if (strncmp(string, "sel.first", length) == 0) {
          *indexPtr = entryPtr->selectFirst;
      } else if (strncmp(string, "sel.last", length) == 0) {
          *indexPtr = entryPtr->selectLast;
      } else {
          goto badIndex;
      }
    } else if (string[0] == '@') {
      int x, roundUp, maxWidth;

      if (Tcl_GetInt(interp, string + 1, &x) != TCL_OK) {
          goto badIndex;
      }
      if (x < entryPtr->inset) {
          x = entryPtr->inset;
      }
      roundUp = 0;
      maxWidth = Tk_Width(entryPtr->tkwin) - entryPtr->inset
          - entryPtr->xWidth - 1;
      if (x > maxWidth) {
          x = maxWidth;
          roundUp = 1;
      }
      *indexPtr = Tk_PointToChar(entryPtr->textLayout,
            x - entryPtr->layoutX, 0);

      /*
       * Special trick:  if the x-position was off-screen to the right,
       * round the index up to refer to the character just after the
       * last visible one on the screen.  This is needed to enable the
       * last character to be selected, for example.
       */

      if (roundUp && (*indexPtr < entryPtr->numChars)) {
          *indexPtr += 1;
      }
    } else {
      if (Tcl_GetInt(interp, string, indexPtr) != TCL_OK) {
          goto badIndex;
      }
      if (*indexPtr < 0){
          *indexPtr = 0;
      } else if (*indexPtr > entryPtr->numChars) {
          *indexPtr = entryPtr->numChars;
      } 
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * EntryScanTo --
 *
 *    Given a y-coordinate (presumably of the curent mouse location)
 *    drag the view in the window to implement the scan operation.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The view in the window may change.
 *
 *----------------------------------------------------------------------
 */

static void
EntryScanTo(entryPtr, x)
    Entry *entryPtr;          /* Information about widget. */
    int x;              /* X-coordinate to use for scan operation. */
{
    int newLeftIndex;

    /*
     * Compute new leftIndex for entry by amplifying the difference
     * between the current position and the place where the scan
     * started (the "mark" position).  If we run off the left or right
     * side of the entry, then reset the mark point so that the current
     * position continues to correspond to the edge of the window.
     * This means that the picture will start dragging as soon as the
     * mouse reverses direction (without this reset, might have to slide
     * mouse a long ways back before the picture starts moving again).
     */

    newLeftIndex = entryPtr->scanMarkIndex
          - (10 * (x - entryPtr->scanMarkX)) / entryPtr->avgWidth;
    if (newLeftIndex >= entryPtr->numChars) {
      newLeftIndex = entryPtr->scanMarkIndex = entryPtr->numChars - 1;
      entryPtr->scanMarkX = x;
    }
    if (newLeftIndex < 0) {
      newLeftIndex = entryPtr->scanMarkIndex = 0;
      entryPtr->scanMarkX = x;
    } 

    if (newLeftIndex != entryPtr->leftIndex) {
      entryPtr->leftIndex = newLeftIndex;
      entryPtr->flags |= UPDATE_SCROLLBAR;
      EntryComputeGeometry(entryPtr);
      if (newLeftIndex != entryPtr->leftIndex) {
          entryPtr->scanMarkIndex = entryPtr->leftIndex;
          entryPtr->scanMarkX = x;
      }
      EventuallyRedraw(entryPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * EntrySelectTo --
 *
 *    Modify the selection by moving its un-anchored end.  This could
 *    make the selection either larger or smaller.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The selection changes.
 *
 *----------------------------------------------------------------------
 */

static void
EntrySelectTo(entryPtr, index)
    Entry *entryPtr;          /* Information about widget. */
    int index;                /* Character index of element that is to
                         * become the "other" end of the selection. */
{
    int newFirst, newLast;

    /*
     * Grab the selection if we don't own it already.
     */

    if (!(entryPtr->flags & GOT_SELECTION) && (entryPtr->exportSelection)) {
      Tk_OwnSelection(entryPtr->tkwin, XA_PRIMARY, EntryLostSelection,
            (ClientData) entryPtr);
      entryPtr->flags |= GOT_SELECTION;
    }

    /*
     * Pick new starting and ending points for the selection.
     */

    if (entryPtr->selectAnchor > entryPtr->numChars) {
      entryPtr->selectAnchor = entryPtr->numChars;
    }
    if (entryPtr->selectAnchor <= index) {
      newFirst = entryPtr->selectAnchor;
      newLast = index;
    } else {
      newFirst = index;
      newLast = entryPtr->selectAnchor;
      if (newLast < 0) {
          newFirst = newLast = -1;
      }
    }
    if ((entryPtr->selectFirst == newFirst)
          && (entryPtr->selectLast == newLast)) {
      return;
    }
    entryPtr->selectFirst = newFirst;
    entryPtr->selectLast = newLast;
    EventuallyRedraw(entryPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * EntryFetchSelection --
 *
 *    This procedure is called back by Tk when the selection is
 *    requested by someone.  It returns part or all of the selection
 *    in a buffer provided by the caller.
 *
 * Results:
 *    The return value is the number of non-NULL bytes stored
 *    at buffer.  Buffer is filled (or partially filled) with a
 *    NULL-terminated string containing part or all of the selection,
 *    as given by offset and maxBytes.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

static int
EntryFetchSelection(clientData, offset, buffer, maxBytes)
    ClientData clientData;    /* Information about entry widget. */
    int offset;               /* Byte offset within selection of first
                         * character to be returned. */
    char *buffer;       /* Location in which to place selection. */
    int maxBytes;       /* Maximum number of bytes to place at
                         * buffer, not including terminating NULL
                         * character. */
{
    Entry *entryPtr = (Entry *) clientData;
    int byteCount;
    CONST char *string;
    CONST char *selStart, *selEnd;

    if ((entryPtr->selectFirst < 0) || !(entryPtr->exportSelection)) {
      return -1;
    }
    string = entryPtr->displayString;
    selStart = Tcl_UtfAtIndex(string, entryPtr->selectFirst);
    selEnd = Tcl_UtfAtIndex(selStart,
          entryPtr->selectLast - entryPtr->selectFirst);
    byteCount = selEnd - selStart - offset;
    if (byteCount > maxBytes) {
      byteCount = maxBytes;
    }
    if (byteCount <= 0) {
      return 0;
    }
    memcpy(buffer, selStart + offset, (size_t) byteCount);
    buffer[byteCount] = '\0';
    return byteCount;
}

/*
 *----------------------------------------------------------------------
 *
 * EntryLostSelection --
 *
 *    This procedure is called back by Tk when the selection is
 *    grabbed away from an entry widget.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The existing selection is unhighlighted, and the window is
 *    marked as not containing a selection.
 *
 *----------------------------------------------------------------------
 */

static void
EntryLostSelection(clientData)
    ClientData clientData;    /* Information about entry widget. */
{
    Entry *entryPtr = (Entry *) clientData;

    entryPtr->flags &= ~GOT_SELECTION;

    /*
     * On Windows and Mac systems, we want to remember the selection
     * for the next time the focus enters the window.  On Unix, we need
     * to clear the selection since it is always visible.
     */

#ifdef ALWAYS_SHOW_SELECTION
    if ((entryPtr->selectFirst >= 0) && entryPtr->exportSelection) {
      entryPtr->selectFirst = -1;
      entryPtr->selectLast = -1;
      EventuallyRedraw(entryPtr);
    }
#endif
}

/*
 *----------------------------------------------------------------------
 *
 * EventuallyRedraw --
 *
 *    Ensure that an entry is eventually redrawn on the display.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Information gets redisplayed.  Right now we don't do selective
 *    redisplays:  the whole window will be redrawn.  This doesn't
 *    seem to hurt performance noticeably, but if it does then this
 *    could be changed.
 *
 *----------------------------------------------------------------------
 */

static void
EventuallyRedraw(entryPtr)
    Entry *entryPtr;          /* Information about widget. */
{
    if ((entryPtr->flags & ENTRY_DELETED) || !Tk_IsMapped(entryPtr->tkwin)) {
      return;
    }

    /*
     * Right now we don't do selective redisplays:  the whole window
     * will be redrawn.  This doesn't seem to hurt performance noticeably,
     * but if it does then this could be changed.
     */

    if (!(entryPtr->flags & REDRAW_PENDING)) {
      entryPtr->flags |= REDRAW_PENDING;
      Tcl_DoWhenIdle(DisplayEntry, (ClientData) entryPtr);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * EntryVisibleRange --
 *
 *    Return information about the range of the entry that is
 *    currently visible.
 *
 * Results:
 *    *firstPtr and *lastPtr are modified to hold fractions between
 *    0 and 1 identifying the range of characters visible in the
 *    entry.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

static void
EntryVisibleRange(entryPtr, firstPtr, lastPtr)
    Entry *entryPtr;          /* Information about widget. */
    double *firstPtr;         /* Return position of first visible
                         * character in widget. */
    double *lastPtr;          /* Return position of char just after last
                         * visible one. */
{
    int charsInWindow;

    if (entryPtr->numChars == 0) {
      *firstPtr = 0.0;
      *lastPtr = 1.0;
    } else {
      charsInWindow = Tk_PointToChar(entryPtr->textLayout,
            Tk_Width(entryPtr->tkwin) - entryPtr->inset
            - entryPtr->xWidth - entryPtr->layoutX - 1, 0);
      if (charsInWindow < entryPtr->numChars) {
          charsInWindow++;
      }
      charsInWindow -= entryPtr->leftIndex;
      if (charsInWindow == 0) {
          charsInWindow = 1;
      }

      *firstPtr = (double) entryPtr->leftIndex / entryPtr->numChars;
      *lastPtr = (double) (entryPtr->leftIndex + charsInWindow)
            / entryPtr->numChars;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * EntryUpdateScrollbar --
 *
 *    This procedure is invoked whenever information has changed in
 *    an entry in a way that would invalidate a scrollbar display.
 *    If there is an associated scrollbar, then this procedure updates
 *    it by invoking a Tcl command.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    A Tcl command is invoked, and an additional command may be
 *    invoked to process errors in the command.
 *
 *----------------------------------------------------------------------
 */

static void
EntryUpdateScrollbar(entryPtr)
    Entry *entryPtr;                /* Information about widget. */
{
    char args[TCL_DOUBLE_SPACE * 2];
    int code;
    double first, last;
    Tcl_Interp *interp;

    if (entryPtr->scrollCmd == NULL) {
      return;
    }

    interp = entryPtr->interp;
    Tcl_Preserve((ClientData) interp);
    EntryVisibleRange(entryPtr, &first, &last);
    sprintf(args, " %g %g", first, last);
    code = Tcl_VarEval(interp, entryPtr->scrollCmd, args, (char *) NULL);
    if (code != TCL_OK) {
      Tcl_AddErrorInfo(interp,
            "\n    (horizontal scrolling command executed by ");
      Tcl_AddErrorInfo(interp, Tk_PathName(entryPtr->tkwin));
      Tcl_AddErrorInfo(interp, ")");
      Tcl_BackgroundError(interp);
    }
    Tcl_SetResult(interp, (char *) NULL, TCL_STATIC);
    Tcl_Release((ClientData) interp);
}

/*
 *----------------------------------------------------------------------
 *
 * EntryBlinkProc --
 *
 *    This procedure is called as a timer handler to blink the
 *    insertion cursor off and on.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The cursor gets turned on or off, redisplay gets invoked,
 *    and this procedure reschedules itself.
 *
 *----------------------------------------------------------------------
 */

static void
EntryBlinkProc(clientData)
    ClientData clientData;    /* Pointer to record describing entry. */
{
    Entry *entryPtr = (Entry *) clientData;

    if ((entryPtr->state == STATE_DISABLED) ||
          (entryPtr->state == STATE_READONLY) ||
          !(entryPtr->flags & GOT_FOCUS) || (entryPtr->insertOffTime == 0)) {
      return;
    }
    if (entryPtr->flags & CURSOR_ON) {
      entryPtr->flags &= ~CURSOR_ON;
      entryPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
          entryPtr->insertOffTime, EntryBlinkProc, (ClientData) entryPtr);
    } else {
      entryPtr->flags |= CURSOR_ON;
      entryPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
          entryPtr->insertOnTime, EntryBlinkProc, (ClientData) entryPtr);
    }
    EventuallyRedraw(entryPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * EntryFocusProc --
 *
 *    This procedure is called whenever the entry gets or loses the
 *    input focus.  It's also called whenever the window is reconfigured
 *    while it has the focus.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The cursor gets turned on or off.
 *
 *----------------------------------------------------------------------
 */

static void
EntryFocusProc(entryPtr, gotFocus)
    Entry *entryPtr;          /* Entry that got or lost focus. */
    int gotFocus;       /* 1 means window is getting focus, 0 means
                         * it's losing it. */
{
    Tcl_DeleteTimerHandler(entryPtr->insertBlinkHandler);
    if (gotFocus) {
      entryPtr->flags |= GOT_FOCUS | CURSOR_ON;
      if (entryPtr->insertOffTime != 0) {
          entryPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
                entryPtr->insertOnTime, EntryBlinkProc,
                (ClientData) entryPtr);
      }
      if (entryPtr->validate == VALIDATE_ALL ||
          entryPtr->validate == VALIDATE_FOCUS ||
          entryPtr->validate == VALIDATE_FOCUSIN) {
          EntryValidateChange(entryPtr, (char *) NULL,
                        entryPtr->string, -1, VALIDATE_FOCUSIN);
      }
    } else {
      entryPtr->flags &= ~(GOT_FOCUS | CURSOR_ON);
      entryPtr->insertBlinkHandler = (Tcl_TimerToken) NULL;
      if (entryPtr->validate == VALIDATE_ALL ||
          entryPtr->validate == VALIDATE_FOCUS ||
          entryPtr->validate == VALIDATE_FOCUSOUT) {
          EntryValidateChange(entryPtr, (char *) NULL,
                        entryPtr->string, -1, VALIDATE_FOCUSOUT);
      }
    }
    EventuallyRedraw(entryPtr);
}

/*
 *--------------------------------------------------------------
 *
 * EntryTextVarProc --
 *
 *    This procedure is invoked when someone changes the variable
 *    whose contents are to be displayed in an entry.
 *
 * Results:
 *    NULL is always returned.
 *
 * Side effects:
 *    The text displayed in the entry will change to match the
 *    variable.
 *
 *--------------------------------------------------------------
 */

      /* ARGSUSED */
static char *
EntryTextVarProc(clientData, interp, name1, name2, flags)
    ClientData clientData;    /* Information about button. */
    Tcl_Interp *interp;       /* Interpreter containing variable. */
    CONST char *name1;        /* Not used. */
    CONST char *name2;        /* Not used. */
    int flags;                /* Information about what happened. */
{
    Entry *entryPtr = (Entry *) clientData;
    CONST char *value;

    if (entryPtr->flags & ENTRY_DELETED) {
      /*
       * Just abort early if we entered here while being deleted.
       */
      return (char *) NULL;
    }

    /*
     * If the variable is unset, then immediately recreate it unless
     * the whole interpreter is going away.
     */

    if (flags & TCL_TRACE_UNSETS) {
      if ((flags & TCL_TRACE_DESTROYED) && !(flags & TCL_INTERP_DESTROYED)) {
          Tcl_SetVar(interp, entryPtr->textVarName, entryPtr->string,
                TCL_GLOBAL_ONLY);
          Tcl_TraceVar(interp, entryPtr->textVarName,
                TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                EntryTextVarProc, clientData);
          entryPtr->flags |= ENTRY_VAR_TRACED;
      }
      return (char *) NULL;
    }

    /*
     * Update the entry's text with the value of the variable, unless
     * the entry already has that value (this happens when the variable
     * changes value because we changed it because someone typed in
     * the entry).
     */

    value = Tcl_GetVar(interp, entryPtr->textVarName, TCL_GLOBAL_ONLY);
    if (value == NULL) {
      value = "";
    }
    EntrySetValue(entryPtr, value);
    return (char *) NULL;
}

/*
 *--------------------------------------------------------------
 *
 * EntryValidate --
 *
 *    This procedure is invoked when any character is added or
 *    removed from the entry widget, or a focus has trigerred validation.
 *
 * Results:
 *    TCL_OK if the validatecommand passes the new string.
 *      TCL_BREAK if the vcmd executed OK, but rejects the string.
 *      TCL_ERROR if an error occurred while executing the vcmd
 *      or a valid Tcl_Bool is not returned.
 *
 * Side effects:
 *      An error condition may arise
 *
 *--------------------------------------------------------------
 */

static int
EntryValidate(entryPtr, cmd)
     register Entry *entryPtr;      /* Entry that needs validation. */
     register char *cmd;      /* Validation command (NULL-terminated
                         * string). */
{
    register Tcl_Interp *interp = entryPtr->interp;
    int code, bool;

    code = Tcl_EvalEx(interp, cmd, -1, TCL_EVAL_GLOBAL | TCL_EVAL_DIRECT);

    /*
     * We accept TCL_OK and TCL_RETURN as valid return codes from the
     * command callback.
     */
    if (code != TCL_OK && code != TCL_RETURN) {
      Tcl_AddErrorInfo(interp, "\n\t(in validation command executed by ");
      Tcl_AddErrorInfo(interp, Tk_PathName(entryPtr->tkwin));
      Tcl_AddErrorInfo(interp, ")");
      Tcl_BackgroundError(interp);
      return TCL_ERROR;
    }

    /*
     * The command callback should return an acceptable Tcl boolean.
     */
    if (Tcl_GetBooleanFromObj(interp, Tcl_GetObjResult(interp),
                        &bool) != TCL_OK) {
      Tcl_AddErrorInfo(interp,
             "\nvalid boolean not returned by validation command");
      Tcl_BackgroundError(interp);
      Tcl_SetResult(interp, NULL, 0);
      return TCL_ERROR;
    }

    Tcl_SetResult(interp, NULL, 0);
    return (bool ? TCL_OK : TCL_BREAK);
}

/*
 *--------------------------------------------------------------
 *
 * EntryValidateChange --
 *
 *    This procedure is invoked when any character is added or
 *    removed from the entry widget, or a focus has trigerred validation.
 *
 * Results:
 *    TCL_OK if the validatecommand accepts the new string,
 *      TCL_ERROR if any problems occured with validatecommand.
 *
 * Side effects:
 *      The insertion/deletion may be aborted, and the
 *      validatecommand might turn itself off (if an error
 *      or loop condition arises).
 *
 *--------------------------------------------------------------
 */

static int
EntryValidateChange(entryPtr, change, new, index, type)
     register Entry *entryPtr;      /* Entry that needs validation. */
     char *change;            /* Characters to be added/deleted
                         * (NULL-terminated string). */
     CONST char *new;           /* Potential new value of entry string */
     int index;                 /* index of insert/delete, -1 otherwise */
     int type;                  /* forced, delete, insert,
                         * focusin or focusout */
{
    int code, varValidate = (entryPtr->flags & VALIDATE_VAR);
    char *p;
    Tcl_DString script;
    
    if (entryPtr->validateCmd == NULL ||
      entryPtr->validate == VALIDATE_NONE) {
      return (varValidate ? TCL_ERROR : TCL_OK);
    }

    /*
     * If we're already validating, then we're hitting a loop condition
     * Return and set validate to 0 to disallow further validations
     * and prevent current validation from finishing
     */
    if (entryPtr->flags & VALIDATING) {
      entryPtr->validate = VALIDATE_NONE;
      return (varValidate ? TCL_ERROR : TCL_OK);
    }

    entryPtr->flags |= VALIDATING;

    /*
     * Now form command string and run through the -validatecommand
     */

    Tcl_DStringInit(&script);
    ExpandPercents(entryPtr, entryPtr->validateCmd,
          change, new, index, type, &script);
    Tcl_DStringAppend(&script, "", 1);

    p = Tcl_DStringValue(&script);
    code = EntryValidate(entryPtr, p);
    Tcl_DStringFree(&script);

    /*
     * If e->validate has become VALIDATE_NONE during the validation, or
     * we now have VALIDATE_VAR set (from EntrySetValue) and didn't before,
     * it means that a loop condition almost occured.  Do not allow
     * this validation result to finish.
     */

    if (entryPtr->validate == VALIDATE_NONE
          || (!varValidate && (entryPtr->flags & VALIDATE_VAR))) {
      code = TCL_ERROR;
    }

    /*
     * It's possible that the user deleted the entry during validation.
     * In that case, abort future validation and return an error.
     */

    if (entryPtr->flags & ENTRY_DELETED) {
      return TCL_ERROR;
    }

    /*
     * If validate will return ERROR, then disallow further validations
     * Otherwise, if it didn't accept the new string (returned TCL_BREAK)
     * then eval the invalidCmd (if it's set)
     */

    if (code == TCL_ERROR) {
      entryPtr->validate = VALIDATE_NONE;
    } else if (code == TCL_BREAK) {
      /*
       * If we were doing forced validation (like via a variable
       * trace) and the command returned 0, the we turn off validation
       * because we assume that textvariables have precedence in
       * managing the value.  We also don't call the invcmd, as it
       * may want to do entry manipulation which the setting of the
       * var will later wipe anyway.
       */

      if (varValidate) {
          entryPtr->validate = VALIDATE_NONE;
      } else if (entryPtr->invalidCmd != NULL) {
          Tcl_DStringInit(&script);
          ExpandPercents(entryPtr, entryPtr->invalidCmd,
                     change, new, index, type, &script);
          Tcl_DStringAppend(&script, "", 1);
          p = Tcl_DStringValue(&script);
          if (Tcl_EvalEx(entryPtr->interp, p, -1,
                TCL_EVAL_GLOBAL | TCL_EVAL_DIRECT) != TCL_OK) {
            Tcl_AddErrorInfo(entryPtr->interp,
                         "\n\t(in invalidcommand executed by entry)");
            Tcl_BackgroundError(entryPtr->interp);
            code = TCL_ERROR;
            entryPtr->validate = VALIDATE_NONE;
          }
          Tcl_DStringFree(&script);

          /*
           * It's possible that the user deleted the entry during validation.
           * In that case, abort future validation and return an error.
           */

          if (entryPtr->flags & ENTRY_DELETED) {
            return TCL_ERROR;
          }
      }
    }

    entryPtr->flags &= ~VALIDATING;

    return code;
}

/*
 *--------------------------------------------------------------
 *
 * ExpandPercents --
 *
 *    Given a command and an event, produce a new command
 *    by replacing % constructs in the original command
 *    with information from the X event.
 *
 * Results:
 *    The new expanded command is appended to the dynamic string
 *    given by dsPtr.
 *
 * Side effects:
 *    None.
 *
 *--------------------------------------------------------------
 */

static void
ExpandPercents(entryPtr, before, change, new, index, type, dsPtr)
     register Entry *entryPtr;      /* Entry that needs validation. */
     register CONST char *before;
                        /* Command containing percent
                         * expressions to be replaced. */
     char *change;            /* Characters to added/deleted
                         * (NULL-terminated string). */
     CONST char *new;         /* Potential new value of entry string */
     int index;               /* index of insert/delete */
     int type;                /* INSERT or DELETE */
     Tcl_DString *dsPtr;      /* Dynamic string in which to append
                         * new command. */
{
    int spaceNeeded, cvtFlags;      /* Used to substitute string as proper Tcl
                         * list element. */
    int number, length;
    register CONST char *string;
    Tcl_UniChar ch;
    char numStorage[2*TCL_INTEGER_SPACE];

    while (1) {
      if (*before == '\0') {
          break;
      }
      /*
       * Find everything up to the next % character and append it
       * to the result string.
       */

      string = before;
      /* No need to convert '%', as it is in ascii range */
      string = Tcl_UtfFindFirst(before, '%');
      if (string == (char *) NULL) {
          Tcl_DStringAppend(dsPtr, before, -1);
          break;
      } else if (string != before) {
          Tcl_DStringAppend(dsPtr, before, string-before);
          before = string;
      }

      /*
       * There's a percent sequence here.  Process it.
       */

      before++; /* skip over % */
      if (*before != '\0') {
          before += Tcl_UtfToUniChar(before, &ch);
      } else {
          ch = '%';
      }
      if (type == VALIDATE_BUTTON) {
          /*
           * -command %-substitution
           */
          switch (ch) {
            case 's': /* Current string value of spinbox */
                string = entryPtr->string;
                break;
            case 'd': /* direction, up or down */
                string = change;
                break;
            case 'W': /* widget name */
                string = Tk_PathName(entryPtr->tkwin);
                break;
            default:
                length = Tcl_UniCharToUtf(ch, numStorage);
                numStorage[length] = '\0';
                string = numStorage;
                break;
          }
      } else {
          /*
           * -validatecommand / -invalidcommand %-substitution
           */
          switch (ch) {
            case 'd': /* Type of call that caused validation */
                switch (type) {
                  case VALIDATE_INSERT:
                      number = 1;
                      break;
                  case VALIDATE_DELETE:
                      number = 0;
                      break;
                  default:
                      number = -1;
                      break;
                }
                sprintf(numStorage, "%d", number);
                string = numStorage;
                break;
            case 'i': /* index of insert/delete */
                sprintf(numStorage, "%d", index);
                string = numStorage;
                break;
            case 'P': /* 'Peeked' new value of the string */
                string = new;
                break;
            case 's': /* Current string value of spinbox */
                string = entryPtr->string;
                break;
            case 'S': /* string to be inserted/deleted, if any */
                string = change;
                break;
            case 'v': /* type of validation currently set */
                string = validateStrings[entryPtr->validate];
                break;
            case 'V': /* type of validation in effect */
                switch (type) {
                  case VALIDATE_INSERT:
                  case VALIDATE_DELETE:
                      string = validateStrings[VALIDATE_KEY];
                      break;
                  case VALIDATE_FORCED:
                      string = "forced";
                      break;
                  default:
                      string = validateStrings[type];
                      break;
                }
                break;
            case 'W': /* widget name */
                string = Tk_PathName(entryPtr->tkwin);
                break;
            default:
                length = Tcl_UniCharToUtf(ch, numStorage);
                numStorage[length] = '\0';
                string = numStorage;
                break;
          }
      }

      spaceNeeded = Tcl_ScanCountedElement(string, -1, &cvtFlags);
      length = Tcl_DStringLength(dsPtr);
      Tcl_DStringSetLength(dsPtr, length + spaceNeeded);
      spaceNeeded = Tcl_ConvertCountedElement(string, -1,
            Tcl_DStringValue(dsPtr) + length,
            cvtFlags | TCL_DONT_USE_BRACES);
      Tcl_DStringSetLength(dsPtr, length + spaceNeeded);
    }
}

/*
 *--------------------------------------------------------------
 *
 * Tk_SpinboxObjCmd --
 *
 *    This procedure is invoked to process the "spinbox" Tcl
 *    command.  See the user documentation for details on what
 *    it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *--------------------------------------------------------------
 */

int
Tk_SpinboxObjCmd(clientData, interp, objc, objv)
    ClientData clientData;    /* NULL. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];      /* Argument objects. */
{
    register Entry *entryPtr;
    register Spinbox *sbPtr;
    Tk_OptionTable optionTable;
    Tk_Window tkwin;
    char *tmp;

    if (objc < 2) {
      Tcl_WrongNumArgs(interp, 1, objv, "pathName ?options?");
      return TCL_ERROR;
    }

    tkwin = Tk_CreateWindowFromPath(interp, Tk_MainWindow(interp),
            Tcl_GetString(objv[1]), (char *) NULL);
    if (tkwin == NULL) {
      return TCL_ERROR;
    }

    /*
     * Create the option table for this widget class.  If it has already
     * been created, Tk will return the cached value.
     */

    optionTable = Tk_CreateOptionTable(interp, sbOptSpec);

    /*
     * Initialize the fields of the structure that won't be initialized
     * by ConfigureEntry, or that ConfigureEntry requires to be
     * initialized already (e.g. resource pointers).  Only the non-NULL/0
     * data must be initialized as memset covers the rest.
     */

    sbPtr               = (Spinbox *) ckalloc(sizeof(Spinbox));
    entryPtr                  = (Entry *) sbPtr;
    memset((VOID *) sbPtr, 0, sizeof(Spinbox));

    entryPtr->tkwin           = tkwin;
    entryPtr->display         = Tk_Display(tkwin);
    entryPtr->interp          = interp;
    entryPtr->widgetCmd       = Tcl_CreateObjCommand(interp,
          Tk_PathName(entryPtr->tkwin), SpinboxWidgetObjCmd,
          (ClientData) sbPtr, EntryCmdDeletedProc);
    entryPtr->optionTable     = optionTable;
    entryPtr->type            = TK_SPINBOX;
    tmp                       = (char *) ckalloc(1);
    tmp[0]              = '\0';
    entryPtr->string          = tmp;
    entryPtr->selectFirst     = -1;
    entryPtr->selectLast      = -1;

    entryPtr->cursor          = None;
    entryPtr->exportSelection = 1;
    entryPtr->justify         = TK_JUSTIFY_LEFT;
    entryPtr->relief          = TK_RELIEF_FLAT;
    entryPtr->state           = STATE_NORMAL;
    entryPtr->displayString   = entryPtr->string;
    entryPtr->inset           = XPAD;
    entryPtr->textGC          = None;
    entryPtr->selTextGC       = None;
    entryPtr->highlightGC     = None;
    entryPtr->avgWidth        = 1;
    entryPtr->validate        = VALIDATE_NONE;

    sbPtr->selElement         = SEL_NONE;
    sbPtr->curElement         = SEL_NONE;
    sbPtr->bCursor            = None;
    sbPtr->repeatDelay        = 400;
    sbPtr->repeatInterval     = 100;
    sbPtr->fromValue          = 0.0;
    sbPtr->toValue            = 100.0;
    sbPtr->increment          = 1.0;
    sbPtr->formatBuf          = (char *) ckalloc(TCL_DOUBLE_SPACE);
    sbPtr->bdRelief           = TK_RELIEF_FLAT;
    sbPtr->buRelief           = TK_RELIEF_FLAT;

    /*
     * Keep a hold of the associated tkwin until we destroy the listbox,
     * otherwise Tk might free it while we still need it.
     */

    Tcl_Preserve((ClientData) entryPtr->tkwin);

    Tk_SetClass(entryPtr->tkwin, "Spinbox");
    Tk_SetClassProcs(entryPtr->tkwin, &entryClass, (ClientData) entryPtr);
    Tk_CreateEventHandler(entryPtr->tkwin,
          PointerMotionMask|ExposureMask|StructureNotifyMask|FocusChangeMask,
          EntryEventProc, (ClientData) entryPtr);
    Tk_CreateSelHandler(entryPtr->tkwin, XA_PRIMARY, XA_STRING,
          EntryFetchSelection, (ClientData) entryPtr, XA_STRING);

    if (Tk_InitOptions(interp, (char *) sbPtr, optionTable, tkwin)
          != TCL_OK) {
      Tk_DestroyWindow(entryPtr->tkwin);
      return TCL_ERROR;
    }
    if (ConfigureEntry(interp, entryPtr, objc-2, objv+2, 0) != TCL_OK) {
      goto error;
    }
    
    Tcl_SetResult(interp, Tk_PathName(entryPtr->tkwin), TCL_STATIC);
    return TCL_OK;

    error:
    Tk_DestroyWindow(entryPtr->tkwin);
    return TCL_ERROR;
}

/*
 *--------------------------------------------------------------
 *
 * SpinboxWidgetObjCmd --
 *
 *    This procedure is invoked to process the Tcl command
 *    that corresponds to a widget managed by this module.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *--------------------------------------------------------------
 */

static int
SpinboxWidgetObjCmd(clientData, interp, objc, objv)
    ClientData clientData;    /* Information about spinbox widget. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int objc;                 /* Number of arguments. */
    Tcl_Obj *CONST objv[];    /* Argument objects. */
{
    Entry *entryPtr = (Entry *) clientData;
    Spinbox *sbPtr = (Spinbox *) clientData;
    int cmdIndex, selIndex, result;
    Tcl_Obj *objPtr;

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

    /*
     * Parse the widget command by looking up the second token in
     * the list of valid command names. 
     */

    result = Tcl_GetIndexFromObj(interp, objv[1], sbCmdNames,
          "option", 0, &cmdIndex);
    if (result != TCL_OK) {
      return result;
    }

    Tcl_Preserve((ClientData) entryPtr);
    switch ((enum sbCmd) cmdIndex) {
        case SB_CMD_BBOX: {
          int index, x, y, width, height;
          char buf[TCL_INTEGER_SPACE * 4];

          if (objc != 3) {
              Tcl_WrongNumArgs(interp, 2, objv, "index");
            goto error;
          }
          if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), 
                    &index) != TCL_OK) {
              goto error;
          }
          if ((index == entryPtr->numChars) && (index > 0)) {
              index--;
          }
          Tk_CharBbox(entryPtr->textLayout, index, &x, &y, 
                    &width, &height);
          sprintf(buf, "%d %d %d %d", x + entryPtr->layoutX,
                y + entryPtr->layoutY, width, height);
          Tcl_SetResult(interp, buf, TCL_VOLATILE);
          break;
      } 
      
        case SB_CMD_CGET: {
          if (objc != 3) {
              Tcl_WrongNumArgs(interp, 2, objv, "option");
            goto error;
          }
          
          objPtr = Tk_GetOptionValue(interp, (char *) entryPtr,
                entryPtr->optionTable, objv[2], entryPtr->tkwin);
          if (objPtr == NULL) {
             goto error;
          } else {
            Tcl_SetObjResult(interp, objPtr);
          }
          break;
      }

        case SB_CMD_CONFIGURE: {
          if (objc <= 3) {
            objPtr = Tk_GetOptionInfo(interp, (char *) entryPtr,
                  entryPtr->optionTable,
                  (objc == 3) ? objv[2] : (Tcl_Obj *) NULL,
                  entryPtr->tkwin);
            if (objPtr == NULL) {
                goto error;
            } else {
                Tcl_SetObjResult(interp, objPtr);
            }
          } else {
            result = ConfigureEntry(interp, entryPtr, objc-2, objv+2, 0);
          }
          break;
      }

        case SB_CMD_DELETE: {
          int first, last;

          if ((objc < 3) || (objc > 4)) {
              Tcl_WrongNumArgs(interp, 2, objv, "firstIndex ?lastIndex?");
            goto error;
          }
          if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), 
                    &first) != TCL_OK) {
              goto error;
          }
          if (objc == 3) {
              last = first + 1;
          } else {
              if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[3]), 
                        &last) != TCL_OK) {
                goto error;
            }
          }
          if ((last >= first) && (entryPtr->state == STATE_NORMAL)) {
              DeleteChars(entryPtr, first, last - first);
          }
          break;
      }

        case SB_CMD_GET: {
          if (objc != 2) {
              Tcl_WrongNumArgs(interp, 2, objv, (char *) NULL);
            goto error;
          }
          Tcl_SetStringObj(Tcl_GetObjResult(interp), entryPtr->string, -1);
          break;
      }

        case SB_CMD_ICURSOR: {
          if (objc != 3) {
              Tcl_WrongNumArgs(interp, 2, objv, "pos");
            goto error;
          }
          if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]),
                    &entryPtr->insertPos) != TCL_OK) {
              goto error;
          }
          EventuallyRedraw(entryPtr);
          break;
      }
      
        case SB_CMD_IDENTIFY: {
          int x, y, elem;

          if (objc != 4) {
              Tcl_WrongNumArgs(interp, 2, objv, "x y");
            goto error;
          }
          if ((Tcl_GetIntFromObj(interp, objv[2], &x) != TCL_OK) ||
                (Tcl_GetIntFromObj(interp, objv[3], &y) != TCL_OK)) {
            goto error;
          }
          elem = GetSpinboxElement(sbPtr, x, y);
          if (elem != SEL_NONE) {
            Tcl_SetStringObj(Tcl_GetObjResult(interp),
                  selElementNames[elem], -1);
          }
          break;
      }
      
        case SB_CMD_INDEX: {
          int index;

          if (objc != 3) {
              Tcl_WrongNumArgs(interp, 2, objv, "string");
            goto error;
          }
          if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), 
                    &index) != TCL_OK) {
              goto error;
          }
          Tcl_SetObjResult(interp, Tcl_NewIntObj(index));
          break;
      }

        case SB_CMD_INSERT: {
          int index;

          if (objc != 4) {
              Tcl_WrongNumArgs(interp, 2, objv, "index text");
            goto error;
          }
          if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), 
                    &index) != TCL_OK) {
              goto error;
          }
          if (entryPtr->state == STATE_NORMAL) {
              InsertChars(entryPtr, index, Tcl_GetString(objv[3]));
          }
          break;
      }

        case SB_CMD_INVOKE: {
          if (objc != 3) {
              Tcl_WrongNumArgs(interp, 2, objv, "elemName");
            goto error;
          }
          result = Tcl_GetIndexFromObj(interp, objv[2],
                selElementNames, "element", 0, &cmdIndex);
          if (result != TCL_OK) {
            goto error;
          }
          if (entryPtr->state != STATE_DISABLED) {
            if (SpinboxInvoke(interp, sbPtr, cmdIndex) != TCL_OK) {
                goto error;
            }
          }
          break;
      }

        case SB_CMD_SCAN: {
          int x;
          char *minorCmd;

          if (objc != 4) {
              Tcl_WrongNumArgs(interp, 2, objv, "mark|dragto x");
            goto error;
          }
          if (Tcl_GetIntFromObj(interp, objv[3], &x) != TCL_OK) {
              goto error;
          }

          minorCmd = Tcl_GetString(objv[2]);
          if (minorCmd[0] == 'm' 
                    && (strncmp(minorCmd, "mark", strlen(minorCmd)) == 0)) {
              entryPtr->scanMarkX = x;
            entryPtr->scanMarkIndex = entryPtr->leftIndex;
          } else if ((minorCmd[0] == 'd')
            && (strncmp(minorCmd, "dragto", strlen(minorCmd)) == 0)) {
              EntryScanTo(entryPtr, x);
          } else {
              Tcl_AppendResult(interp, "bad scan option \"", 
                        Tcl_GetString(objv[2]), "\": must be mark or dragto", 
                        (char *) NULL);
            goto error;
          }
          break;
      }

      case SB_CMD_SELECTION: {
          int index, index2;

          if (objc < 3) {
              Tcl_WrongNumArgs(interp, 2, objv, "option ?index?");
            goto error;
          }

          /* 
           * Parse the selection sub-command, using the command
           * table "sbSelCmdNames" defined above.
           */
          
          result = Tcl_GetIndexFromObj(interp, objv[2], sbSelCmdNames,
                    "selection option", 0, &selIndex);
          if (result != TCL_OK) {
              goto error;
          }

          /*
           * Disabled entries don't allow the selection to be modified,
           * but 'selection present' must return a boolean.
           */

          if ((entryPtr->state == STATE_DISABLED)
                && (selIndex != SB_SEL_PRESENT)) {
            goto done;
          }

          switch (selIndex) {
              case SB_SEL_ADJUST: {
                if (objc != 4) {
                    Tcl_WrongNumArgs(interp, 3, objv, "index");
                  goto error;
                }
                if (GetEntryIndex(interp, entryPtr, 
                            Tcl_GetString(objv[3]), &index) != TCL_OK) {
                    goto error;
                }
                if (entryPtr->selectFirst >= 0) {
                    int half1, half2;
            
                  half1 = (entryPtr->selectFirst 
                          + entryPtr->selectLast)/2;
                  half2 = (entryPtr->selectFirst 
                        + entryPtr->selectLast + 1)/2;
                  if (index < half1) {
                      entryPtr->selectAnchor = entryPtr->selectLast;
                  } else if (index > half2) {
                      entryPtr->selectAnchor = entryPtr->selectFirst;
                  } else {
                    /*
                     * We're at about the halfway point in the 
                     * selection; just keep the existing anchor.
                     */
                  }
                }
                EntrySelectTo(entryPtr, index);
                break;
            }

              case SB_SEL_CLEAR: {
                if (objc != 3) {
                    Tcl_WrongNumArgs(interp, 3, objv, (char *) NULL);
                  goto error;
                }
                if (entryPtr->selectFirst >= 0) {
                    entryPtr->selectFirst = -1;
                  entryPtr->selectLast = -1;
                  EventuallyRedraw(entryPtr);
                }
                goto done;
            }

              case SB_SEL_FROM: {
                if (objc != 4) {
                    Tcl_WrongNumArgs(interp, 3, objv, "index");
                  goto error;
                }
                if (GetEntryIndex(interp, entryPtr, 
                            Tcl_GetString(objv[3]), &index) != TCL_OK) {
                    goto error;
                }
                entryPtr->selectAnchor = index;
                break;
            }

              case SB_SEL_PRESENT: {
                if (objc != 3) {
                    Tcl_WrongNumArgs(interp, 3, objv, (char *) NULL);
                  goto error;
                }
                Tcl_SetObjResult(interp,
                      Tcl_NewBooleanObj((entryPtr->selectFirst >= 0)));
                goto done;
            }

              case SB_SEL_RANGE: {
                if (objc != 5) {
                    Tcl_WrongNumArgs(interp, 3, objv, "start end");
                  goto error;
                }
                if (GetEntryIndex(interp, entryPtr, 
                            Tcl_GetString(objv[3]), &index) != TCL_OK) {
                    goto error;
                }
                if (GetEntryIndex(interp, entryPtr, 
                            Tcl_GetString(objv[4]),& index2) != TCL_OK) {
                    goto error;
                }
                if (index >= index2) {
                    entryPtr->selectFirst = -1;
                  entryPtr->selectLast = -1;
                } else {
                    entryPtr->selectFirst = index;
                  entryPtr->selectLast = index2;
                }
                if (!(entryPtr->flags & GOT_SELECTION)
                      && (entryPtr->exportSelection)) {
                    Tk_OwnSelection(entryPtr->tkwin, XA_PRIMARY, 
                          EntryLostSelection, (ClientData) entryPtr);
                  entryPtr->flags |= GOT_SELECTION;
                }
                EventuallyRedraw(entryPtr);
                break;
            }
            
              case SB_SEL_TO: {
                if (objc != 4) {
                    Tcl_WrongNumArgs(interp, 3, objv, "index");
                  goto error;
                }
                if (GetEntryIndex(interp, entryPtr, 
                            Tcl_GetString(objv[3]), &index) != TCL_OK) {
                    goto error;
                }
                EntrySelectTo(entryPtr, index);
                break;
            }

              case SB_SEL_ELEMENT: {
                if ((objc < 3) || (objc > 4)) {
                    Tcl_WrongNumArgs(interp, 3, objv, "?elemName?");
                  goto error;
                }
                if (objc == 3) {
                  Tcl_SetStringObj(Tcl_GetObjResult(interp),
                        selElementNames[sbPtr->selElement], -1);
                } else {
                  int lastElement = sbPtr->selElement;

                  result = Tcl_GetIndexFromObj(interp, objv[3],
                        selElementNames, "selection element", 0,
                        &(sbPtr->selElement));
                  if (result != TCL_OK) {
                      goto error;
                  }
                  if (lastElement != sbPtr->selElement) {
                      EventuallyRedraw(entryPtr);
                  }
                }
                break;
            }
          }
          break;
      }

        case SB_CMD_SET: {
          if (objc > 3) {
              Tcl_WrongNumArgs(interp, 2, objv, "?string?");
            goto error;
          }
          if (objc == 3) {
            EntryValueChanged(entryPtr, Tcl_GetString(objv[2]));
          }
          Tcl_SetStringObj(Tcl_GetObjResult(interp), entryPtr->string, -1);
          break;
      }

        case SB_CMD_VALIDATE: {
          int code;

          if (objc != 2) {
            Tcl_WrongNumArgs(interp, 2, objv, (char *) NULL);
            goto error;
          }
          selIndex = entryPtr->validate;
          entryPtr->validate = VALIDATE_ALL;
          code = EntryValidateChange(entryPtr, (char *) NULL,
                entryPtr->string, -1, VALIDATE_FORCED);
          if (entryPtr->validate != VALIDATE_NONE) {
            entryPtr->validate = selIndex;
          }
          Tcl_SetObjResult(interp, Tcl_NewBooleanObj((code == TCL_OK)));
          break;
      }

        case SB_CMD_XVIEW: {
          int index;

          if (objc == 2) {
              double first, last;
            char buf[TCL_DOUBLE_SPACE * 2];
          
            EntryVisibleRange(entryPtr, &first, &last);
            sprintf(buf, "%g %g", first, last);
            Tcl_SetResult(interp, buf, TCL_VOLATILE);
            goto done;
          } else if (objc == 3) {
              if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), 
                        &index) != TCL_OK) {
                goto error;
            }
          } else {
              double fraction;
            int count;

            index = entryPtr->leftIndex;
            switch (Tk_GetScrollInfoObj(interp, objc, objv, &fraction, 
                        &count)) {
                case TK_SCROLL_ERROR: {
                    goto error;
                }
                case TK_SCROLL_MOVETO: {
                    index = (int) ((fraction * entryPtr->numChars) + 0.5);
                  break;
                }
                case TK_SCROLL_PAGES: {
                    int charsPerPage;
                
                  charsPerPage = ((Tk_Width(entryPtr->tkwin)
                          - 2 * entryPtr->inset - entryPtr->xWidth) 
                                / entryPtr->avgWidth) - 2;
                  if (charsPerPage < 1) {
                      charsPerPage = 1;
                  }
                  index += count * charsPerPage;
                  break;
                }
                case TK_SCROLL_UNITS: {
                    index += count;
                  break;
                }
            }
          }
          if (index >= entryPtr->numChars) {
              index = entryPtr->numChars - 1;
          }
          if (index < 0) {
              index = 0;
          }
          entryPtr->leftIndex = index;
          entryPtr->flags |= UPDATE_SCROLLBAR;
          EntryComputeGeometry(entryPtr);
          EventuallyRedraw(entryPtr);
          break;
      }
    }

    done:
    Tcl_Release((ClientData) entryPtr);
    return result;

    error:
    Tcl_Release((ClientData) entryPtr);
    return TCL_ERROR;
}

/*
 *---------------------------------------------------------------------------
 *
 * GetSpinboxElement --
 *
 *    Return the element associated with an x,y coord.
 *
 * Results:
 *    Element type as enum selelement.
 *
 * Side effects:
 *    None.
 *
 *---------------------------------------------------------------------------
 */

static int
GetSpinboxElement(sbPtr, x, y)
    Spinbox *sbPtr;           /* Spinbox for which the index is being
                         * specified. */
    int x;              /* x coord */
    int y;              /* y coord */
{
    Entry *entryPtr = (Entry *) sbPtr;

    if ((x < 0) || (y < 0) || (y > Tk_Height(entryPtr->tkwin))
          || (x > Tk_Width(entryPtr->tkwin))) {
      return SEL_NONE;
    }

    if (x > (Tk_Width(entryPtr->tkwin) - entryPtr->inset - entryPtr->xWidth)) {
      if (y > (Tk_Height(entryPtr->tkwin) / 2)) {
          return SEL_BUTTONDOWN;
      } else {
          return SEL_BUTTONUP;
      }
    }
    return SEL_ENTRY;
}

/*
 *--------------------------------------------------------------
 *
 * SpinboxInvoke --
 *
 *    This procedure is invoked when the invoke method for the
 *    widget is called.
 *
 * Results:
 *    TCL_OK.
 *
 * Side effects:
 *      An background error condition may arise when invoking the
 *    callback.  The widget value may change.
 *
 *--------------------------------------------------------------
 */

static int
SpinboxInvoke(interp, sbPtr, element)
    register Tcl_Interp *interp;    /* Current interpreter. */
    register Spinbox *sbPtr;        /* Spinbox to invoke. */
    int element;              /* element to invoke, either the "up"
                               * or "down" button. */
{
    Entry *entryPtr = (Entry *) sbPtr;
    char *type;
    int code, up;
    Tcl_DString script;

    switch (element) {
      case SEL_BUTTONUP:
          type = "up";
          up = 1;
          break;
      case SEL_BUTTONDOWN:
          type = "down";
          up = 0;
          break;
      default:
          return TCL_OK;
    }

    if (fabs(sbPtr->increment) > MIN_DBL_VAL) {
      if (sbPtr->listObj != NULL) {
          Tcl_Obj *objPtr;

          Tcl_ListObjIndex(interp, sbPtr->listObj, sbPtr->eIndex, &objPtr);
          if (strcmp(Tcl_GetString(objPtr), entryPtr->string)) {
            /*
             * Somehow the string changed from what we expected,
             * so let's do a search on the list to see if the current
             * value is there.  If not, move to the first element of
             * the list.
             */
            int i, listc, elemLen, length = entryPtr->numChars;
            char *bytes;
            Tcl_Obj **listv;

            Tcl_ListObjGetElements(interp, sbPtr->listObj, &listc, &listv);
            for (i = 0; i < listc; i++) {
                bytes = Tcl_GetStringFromObj(listv[i], &elemLen);
                if ((length == elemLen) &&
                      (memcmp(bytes, entryPtr->string,
                            (size_t) length) == 0)) {
                  sbPtr->eIndex = i;
                  break;
                }
            }
          }
          if (up) {
            if (++sbPtr->eIndex >= sbPtr->nElements) {
                if (sbPtr->wrap) {
                  sbPtr->eIndex = 0;
                } else {
                  sbPtr->eIndex = sbPtr->nElements-1;
                }
            }
          } else {
            if (--sbPtr->eIndex < 0) {
                if (sbPtr->wrap) {
                  sbPtr->eIndex = sbPtr->nElements-1;
                } else {
                  sbPtr->eIndex = 0;
                }
            }
          }
          Tcl_ListObjIndex(interp, sbPtr->listObj, sbPtr->eIndex, &objPtr);
          EntryValueChanged(entryPtr, Tcl_GetString(objPtr));
      } else if (!DOUBLES_EQ(sbPtr->fromValue, sbPtr->toValue)) {
          double dvalue;

          if (Tcl_GetDouble(NULL, entryPtr->string, &dvalue) != TCL_OK) {
            /*
             * If the string is empty, or isn't a valid double value,
             * just use the -from value
             */
            dvalue = sbPtr->fromValue;
          } else {
            if (up) {
                dvalue += sbPtr->increment;
                if (dvalue > sbPtr->toValue) {
                  if (sbPtr->wrap) {
                      dvalue = sbPtr->fromValue;
                  } else {
                      dvalue = sbPtr->toValue;
                  }
                } else if (dvalue < sbPtr->fromValue) {
                  /*
                   * It's possible that when pressing up, we are
                   * still less than the fromValue, because the
                   * user may have manipulated the value by hand.
                   */
                  dvalue = sbPtr->fromValue;
                }
            } else {
                dvalue -= sbPtr->increment;
                if (dvalue < sbPtr->fromValue) {
                  if (sbPtr->wrap) {
                      dvalue = sbPtr->toValue;
                  } else {
                      dvalue = sbPtr->fromValue;
                  }
                } else if (dvalue > sbPtr->toValue) {
                  /*
                   * It's possible that when pressing down, we are
                   * still greater than the toValue, because the
                   * user may have manipulated the value by hand.
                   */
                  dvalue = sbPtr->toValue;
                }
            }
          }
          sprintf(sbPtr->formatBuf, sbPtr->valueFormat, dvalue);
          EntryValueChanged(entryPtr, sbPtr->formatBuf);
      }
    }

    if (sbPtr->command != NULL) {
      Tcl_DStringInit(&script);
      ExpandPercents(entryPtr, sbPtr->command, type, "", 0,
            VALIDATE_BUTTON, &script);
      Tcl_DStringAppend(&script, "", 1);

      code = Tcl_EvalEx(interp, Tcl_DStringValue(&script), -1,
            TCL_EVAL_GLOBAL | TCL_EVAL_DIRECT);
      Tcl_DStringFree(&script);

      if (code != TCL_OK) {
          Tcl_AddErrorInfo(interp, "\n\t(in command executed by spinbox)");
          Tcl_BackgroundError(interp);
          /*
           * Yes, it's an error, but a bg one, so we return OK
           */
          return TCL_OK;
      }

      Tcl_SetResult(interp, NULL, 0);
    }

    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * ComputeFormat --
 *
 *    This procedure is invoked to recompute the "format" fields
 *    of a spinbox's widget record, which determines how the value
 *    of the dial is converted to a string.
 *
 * Results:
 *    Tcl result code.
 *
 * Side effects:
 *    The format fields of the spinbox are modified.
 *
 *----------------------------------------------------------------------
 */
static int
ComputeFormat(sbPtr)
     Spinbox *sbPtr;                /* Information about dial widget. */
{
    double maxValue, x;
    int mostSigDigit, numDigits, leastSigDigit, afterDecimal;
    int eDigits, fDigits;

    /*
     * Compute the displacement from the decimal of the most significant
     * digit required for any number in the dial's range.
     */

    if (sbPtr->reqFormat) {
      sbPtr->valueFormat = sbPtr->reqFormat;
      return TCL_OK;
    }

    maxValue = fabs(sbPtr->fromValue);
    x = fabs(sbPtr->toValue);
    if (x > maxValue) {
      maxValue = x;
    }
    if (maxValue == 0) {
      maxValue = 1;
    }
    mostSigDigit = (int) floor(log10(maxValue));

    if (fabs(sbPtr->increment) > MIN_DBL_VAL) {
      /*
       * A increment was specified, so use it.
       */
      leastSigDigit = (int) floor(log10(sbPtr->increment));
    } else {
      leastSigDigit = 0;
    }
    numDigits = mostSigDigit - leastSigDigit + 1;
    if (numDigits < 1) {
      numDigits = 1;
    }

    /*
     * Compute the number of characters required using "e" format and
     * "f" format, and then choose whichever one takes fewer characters.
     */

    eDigits = numDigits + 4;
    if (numDigits > 1) {
      eDigits++;              /* Decimal point. */
    }
    afterDecimal = numDigits - mostSigDigit - 1;
    if (afterDecimal < 0) {
      afterDecimal = 0;
    }
    fDigits = (mostSigDigit >= 0) ? mostSigDigit + afterDecimal : afterDecimal;
    if (afterDecimal > 0) {
      fDigits++;              /* Decimal point. */
    }
    if (mostSigDigit < 0) {
      fDigits++;              /* Zero to left of decimal point. */
    }
    if (fDigits <= eDigits) {
      sprintf(sbPtr->digitFormat, "%%.%df", afterDecimal);
    } else {
      sprintf(sbPtr->digitFormat, "%%.%de", numDigits-1);
    }
    sbPtr->valueFormat = sbPtr->digitFormat;
    return TCL_OK;
}

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