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tkButton.c

/* 
 * tkButton.c --
 *
 *    This module implements a collection of button-like
 *    widgets for the Tk toolkit.  The widgets implemented
 *    include labels, buttons, check buttons, and radio
 *    buttons.
 *
 * Copyright (c) 1990-1994 The Regents of the University of California.
 * Copyright (c) 1994-1995 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tkButton.c,v 1.2 1998/09/14 18:23:04 stanton Exp $
 */

#include "tkButton.h"
#include "default.h"

/*
 * Class names for buttons, indexed by one of the type values above.
 */

static char *classNames[] = {"Label", "Button", "Checkbutton", "Radiobutton"};

/*
 * The class procedure table for the button widget.
 */

static int configFlags[] = {LABEL_MASK, BUTTON_MASK,
      CHECK_BUTTON_MASK, RADIO_BUTTON_MASK};

/*
 * Information used for parsing configuration specs:
 */

Tk_ConfigSpec tkpButtonConfigSpecs[] = {
    {TK_CONFIG_BORDER, "-activebackground", "activeBackground", "Foreground",
      DEF_BUTTON_ACTIVE_BG_COLOR, Tk_Offset(TkButton, activeBorder),
      BUTTON_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK
      |TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_BORDER, "-activebackground", "activeBackground", "Foreground",
      DEF_BUTTON_ACTIVE_BG_MONO, Tk_Offset(TkButton, activeBorder),
      BUTTON_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK
      |TK_CONFIG_MONO_ONLY},
    {TK_CONFIG_COLOR, "-activeforeground", "activeForeground", "Background",
      DEF_BUTTON_ACTIVE_FG_COLOR, Tk_Offset(TkButton, activeFg), 
      BUTTON_MASK|TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_COLOR, "-activeforeground", "activeForeground", "Background",
      DEF_CHKRAD_ACTIVE_FG_COLOR, Tk_Offset(TkButton, activeFg), 
      CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_COLOR, "-activeforeground", "activeForeground", "Background",
      DEF_BUTTON_ACTIVE_FG_MONO, Tk_Offset(TkButton, activeFg), 
      BUTTON_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK
      |TK_CONFIG_MONO_ONLY},
    {TK_CONFIG_ANCHOR, "-anchor", "anchor", "Anchor",
      DEF_BUTTON_ANCHOR, Tk_Offset(TkButton, anchor), ALL_MASK},
    {TK_CONFIG_BORDER, "-background", "background", "Background",
      DEF_BUTTON_BG_COLOR, Tk_Offset(TkButton, normalBorder),
      ALL_MASK | TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_BORDER, "-background", "background", "Background",
      DEF_BUTTON_BG_MONO, Tk_Offset(TkButton, normalBorder),
      ALL_MASK | TK_CONFIG_MONO_ONLY},
    {TK_CONFIG_SYNONYM, "-bd", "borderWidth", (char *) NULL,
      (char *) NULL, 0, ALL_MASK},
    {TK_CONFIG_SYNONYM, "-bg", "background", (char *) NULL,
      (char *) NULL, 0, ALL_MASK},
    {TK_CONFIG_BITMAP, "-bitmap", "bitmap", "Bitmap",
      DEF_BUTTON_BITMAP, Tk_Offset(TkButton, bitmap),
      ALL_MASK|TK_CONFIG_NULL_OK},
    {TK_CONFIG_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
      DEF_BUTTON_BORDER_WIDTH, Tk_Offset(TkButton, borderWidth), ALL_MASK},
    {TK_CONFIG_STRING, "-command", "command", "Command",
      DEF_BUTTON_COMMAND, Tk_Offset(TkButton, command),
      BUTTON_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|TK_CONFIG_NULL_OK},
    {TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
      DEF_BUTTON_CURSOR, Tk_Offset(TkButton, cursor),
      ALL_MASK|TK_CONFIG_NULL_OK},
    {TK_CONFIG_UID, "-default", "default", "Default",
        DEF_BUTTON_DEFAULT, Tk_Offset(TkButton, defaultState), BUTTON_MASK},
    {TK_CONFIG_COLOR, "-disabledforeground", "disabledForeground",
      "DisabledForeground", DEF_BUTTON_DISABLED_FG_COLOR,
      Tk_Offset(TkButton, disabledFg), BUTTON_MASK|CHECK_BUTTON_MASK
      |RADIO_BUTTON_MASK|TK_CONFIG_COLOR_ONLY|TK_CONFIG_NULL_OK},
    {TK_CONFIG_COLOR, "-disabledforeground", "disabledForeground",
      "DisabledForeground", DEF_BUTTON_DISABLED_FG_MONO,
      Tk_Offset(TkButton, disabledFg), BUTTON_MASK|CHECK_BUTTON_MASK
      |RADIO_BUTTON_MASK|TK_CONFIG_MONO_ONLY|TK_CONFIG_NULL_OK},
    {TK_CONFIG_SYNONYM, "-fg", "foreground", (char *) NULL,
      (char *) NULL, 0, ALL_MASK},
    {TK_CONFIG_FONT, "-font", "font", "Font",
      DEF_BUTTON_FONT, Tk_Offset(TkButton, tkfont),
      ALL_MASK},
    {TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
      DEF_BUTTON_FG, Tk_Offset(TkButton, normalFg), LABEL_MASK|BUTTON_MASK},
    {TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
      DEF_CHKRAD_FG, Tk_Offset(TkButton, normalFg), CHECK_BUTTON_MASK
      |RADIO_BUTTON_MASK},
    {TK_CONFIG_STRING, "-height", "height", "Height",
      DEF_BUTTON_HEIGHT, Tk_Offset(TkButton, heightString), ALL_MASK},
    {TK_CONFIG_BORDER, "-highlightbackground", "highlightBackground",
      "HighlightBackground", DEF_BUTTON_HIGHLIGHT_BG,
      Tk_Offset(TkButton, highlightBorder), ALL_MASK},
    {TK_CONFIG_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",
      DEF_BUTTON_HIGHLIGHT, Tk_Offset(TkButton, highlightColorPtr),
      ALL_MASK},
    {TK_CONFIG_PIXELS, "-highlightthickness", "highlightThickness",
      "HighlightThickness",
      DEF_LABEL_HIGHLIGHT_WIDTH, Tk_Offset(TkButton, highlightWidth),
      LABEL_MASK},
    {TK_CONFIG_PIXELS, "-highlightthickness", "highlightThickness",
      "HighlightThickness",
      DEF_BUTTON_HIGHLIGHT_WIDTH, Tk_Offset(TkButton, highlightWidth),
      BUTTON_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK},
    {TK_CONFIG_STRING, "-image", "image", "Image",
      DEF_BUTTON_IMAGE, Tk_Offset(TkButton, imageString),
      ALL_MASK|TK_CONFIG_NULL_OK},
    {TK_CONFIG_BOOLEAN, "-indicatoron", "indicatorOn", "IndicatorOn",
      DEF_BUTTON_INDICATOR, Tk_Offset(TkButton, indicatorOn),
      CHECK_BUTTON_MASK|RADIO_BUTTON_MASK},
    {TK_CONFIG_JUSTIFY, "-justify", "justify", "Justify",
      DEF_BUTTON_JUSTIFY, Tk_Offset(TkButton, justify), ALL_MASK},
    {TK_CONFIG_STRING, "-offvalue", "offValue", "Value",
      DEF_BUTTON_OFF_VALUE, Tk_Offset(TkButton, offValue),
      CHECK_BUTTON_MASK},
    {TK_CONFIG_STRING, "-onvalue", "onValue", "Value",
      DEF_BUTTON_ON_VALUE, Tk_Offset(TkButton, onValue),
      CHECK_BUTTON_MASK},
    {TK_CONFIG_PIXELS, "-padx", "padX", "Pad",
      DEF_BUTTON_PADX, Tk_Offset(TkButton, padX), BUTTON_MASK},
    {TK_CONFIG_PIXELS, "-padx", "padX", "Pad",
      DEF_LABCHKRAD_PADX, Tk_Offset(TkButton, padX),
      LABEL_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK},
    {TK_CONFIG_PIXELS, "-pady", "padY", "Pad",
      DEF_BUTTON_PADY, Tk_Offset(TkButton, padY), BUTTON_MASK},
    {TK_CONFIG_PIXELS, "-pady", "padY", "Pad",
      DEF_LABCHKRAD_PADY, Tk_Offset(TkButton, padY),
      LABEL_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK},
    {TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
      DEF_BUTTON_RELIEF, Tk_Offset(TkButton, relief), BUTTON_MASK},
    {TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
      DEF_LABCHKRAD_RELIEF, Tk_Offset(TkButton, relief),
      LABEL_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK},
    {TK_CONFIG_BORDER, "-selectcolor", "selectColor", "Background",
      DEF_BUTTON_SELECT_COLOR, Tk_Offset(TkButton, selectBorder),
      CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|TK_CONFIG_COLOR_ONLY
      |TK_CONFIG_NULL_OK},
    {TK_CONFIG_BORDER, "-selectcolor", "selectColor", "Background",
      DEF_BUTTON_SELECT_MONO, Tk_Offset(TkButton, selectBorder),
      CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|TK_CONFIG_MONO_ONLY
      |TK_CONFIG_NULL_OK},
    {TK_CONFIG_STRING, "-selectimage", "selectImage", "SelectImage",
      DEF_BUTTON_SELECT_IMAGE, Tk_Offset(TkButton, selectImageString),
      CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|TK_CONFIG_NULL_OK},
    {TK_CONFIG_UID, "-state", "state", "State",
      DEF_BUTTON_STATE, Tk_Offset(TkButton, state),
      BUTTON_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK},
    {TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus",
      DEF_LABEL_TAKE_FOCUS, Tk_Offset(TkButton, takeFocus),
      LABEL_MASK|TK_CONFIG_NULL_OK},
    {TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus",
      DEF_BUTTON_TAKE_FOCUS, Tk_Offset(TkButton, takeFocus),
      BUTTON_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|TK_CONFIG_NULL_OK},
#ifdef TK_KANJI_OK
    {TK_CONFIG_WSTRING, "-text", "text", "Text",
      DEF_BUTTON_TEXT, Tk_Offset(TkButton, text), ALL_MASK},
#else
    {TK_CONFIG_STRING, "-text", "text", "Text",
      DEF_BUTTON_TEXT, Tk_Offset(TkButton, text), ALL_MASK},
#endif /* TK_KANJI_OK */
    {TK_CONFIG_STRING, "-textvariable", "textVariable", "Variable",
      DEF_BUTTON_TEXT_VARIABLE, Tk_Offset(TkButton, textVarName),
      ALL_MASK|TK_CONFIG_NULL_OK},
    {TK_CONFIG_INT, "-underline", "underline", "Underline",
      DEF_BUTTON_UNDERLINE, Tk_Offset(TkButton, underline), ALL_MASK},
    {TK_CONFIG_STRING, "-value", "value", "Value",
      DEF_BUTTON_VALUE, Tk_Offset(TkButton, onValue),
      RADIO_BUTTON_MASK},
    {TK_CONFIG_STRING, "-variable", "variable", "Variable",
      DEF_RADIOBUTTON_VARIABLE, Tk_Offset(TkButton, selVarName),
      RADIO_BUTTON_MASK},
    {TK_CONFIG_STRING, "-variable", "variable", "Variable",
      DEF_CHECKBUTTON_VARIABLE, Tk_Offset(TkButton, selVarName),
      CHECK_BUTTON_MASK|TK_CONFIG_NULL_OK},
    {TK_CONFIG_STRING, "-width", "width", "Width",
      DEF_BUTTON_WIDTH, Tk_Offset(TkButton, widthString), ALL_MASK},
    {TK_CONFIG_PIXELS, "-wraplength", "wrapLength", "WrapLength",
      DEF_BUTTON_WRAP_LENGTH, Tk_Offset(TkButton, wrapLength), ALL_MASK},
    {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
      (char *) NULL, 0, 0}
};

/*
 * String to print out in error messages, identifying options for
 * widget commands for different types of labels or buttons:
 */

static char *optionStrings[] = {
    "cget or configure",
    "cget, configure, flash, or invoke",
    "cget, configure, deselect, flash, invoke, select, or toggle",
    "cget, configure, deselect, flash, invoke, or select"
};

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

static void       ButtonCmdDeletedProc _ANSI_ARGS_((
                      ClientData clientData));
static int        ButtonCreate _ANSI_ARGS_((ClientData clientData,
                      Tcl_Interp *interp, int argc, char **argv,
                      int type));
static void       ButtonEventProc _ANSI_ARGS_((ClientData clientData,
                      XEvent *eventPtr));
static void       ButtonImageProc _ANSI_ARGS_((ClientData clientData,
                      int x, int y, int width, int height,
                      int imgWidth, int imgHeight));
static void       ButtonSelectImageProc _ANSI_ARGS_((
                      ClientData clientData, int x, int y, int width,
                      int height, int imgWidth, int imgHeight));
static char *           ButtonTextVarProc _ANSI_ARGS_((ClientData clientData,
                      Tcl_Interp *interp, char *name1, char *name2,
                      int flags));
static char *           ButtonVarProc _ANSI_ARGS_((ClientData clientData,
                      Tcl_Interp *interp, char *name1, char *name2,
                      int flags));
static int        ButtonWidgetCmd _ANSI_ARGS_((ClientData clientData,
                      Tcl_Interp *interp, int argc, char **argv));
static int        ConfigureButton _ANSI_ARGS_((Tcl_Interp *interp,
                      TkButton *butPtr, int argc, char **argv,
                      int flags));
static void       DestroyButton _ANSI_ARGS_((TkButton *butPtr));


/*
 *--------------------------------------------------------------
 *
 * Tk_ButtonCmd, Tk_CheckbuttonCmd, Tk_LabelCmd, Tk_RadiobuttonCmd --
 *
 *    These procedures are invoked to process the "button", "label",
 *    "radiobutton", and "checkbutton" Tcl commands.  See the
 *    user documentation for details on what they do.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.  These procedures are just wrappers;
 *    they call ButtonCreate to do all of the real work.
 *
 *--------------------------------------------------------------
 */

int
Tk_ButtonCmd(clientData, interp, argc, argv)
    ClientData clientData;    /* Main window associated with
                         * interpreter. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int argc;                 /* Number of arguments. */
    char **argv;        /* Argument strings. */
{
    return ButtonCreate(clientData, interp, argc, argv, TYPE_BUTTON);
}

int
Tk_CheckbuttonCmd(clientData, interp, argc, argv)
    ClientData clientData;    /* Main window associated with
                         * interpreter. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int argc;                 /* Number of arguments. */
    char **argv;        /* Argument strings. */
{
    return ButtonCreate(clientData, interp, argc, argv, TYPE_CHECK_BUTTON);
}

int
Tk_LabelCmd(clientData, interp, argc, argv)
    ClientData clientData;    /* Main window associated with
                         * interpreter. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int argc;                 /* Number of arguments. */
    char **argv;        /* Argument strings. */
{
    return ButtonCreate(clientData, interp, argc, argv, TYPE_LABEL);
}

int
Tk_RadiobuttonCmd(clientData, interp, argc, argv)
    ClientData clientData;    /* Main window associated with
                         * interpreter. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int argc;                 /* Number of arguments. */
    char **argv;        /* Argument strings. */
{
    return ButtonCreate(clientData, interp, argc, argv, TYPE_RADIO_BUTTON);
}

/*
 *--------------------------------------------------------------
 *
 * ButtonCreate --
 *
 *    This procedure does all the real work of implementing the
 *    "button", "label", "radiobutton", and "checkbutton" Tcl
 *    commands.  See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *--------------------------------------------------------------
 */

static int
ButtonCreate(clientData, interp, argc, argv, type)
    ClientData clientData;    /* Main window associated with
                         * interpreter. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int argc;                 /* Number of arguments. */
    char **argv;        /* Argument strings. */
    int type;                 /* Type of button to create: TYPE_LABEL,
                         * TYPE_BUTTON, TYPE_CHECK_BUTTON, or
                         * TYPE_RADIO_BUTTON. */
{
    register TkButton *butPtr;
    Tk_Window tkwin = (Tk_Window) clientData;
    Tk_Window new;

    if (argc < 2) {
      Tcl_AppendResult(interp, "wrong # args: should be \"",
            argv[0], " pathName ?options?\"", (char *) NULL);
      return TCL_ERROR;
    }

    /*
     * Create the new window.
     */

    new = Tk_CreateWindowFromPath(interp, tkwin, argv[1], (char *) NULL);
    if (new == NULL) {
      return TCL_ERROR;
    }

    Tk_SetClass(new, classNames[type]);
    butPtr = TkpCreateButton(new);

    TkSetClassProcs(new, &tkpButtonProcs, (ClientData) butPtr);

    /*
     * Initialize the data structure for the button.
     */

    butPtr->tkwin = new;
    butPtr->display = Tk_Display(new);
    butPtr->widgetCmd = Tcl_CreateCommand(interp, Tk_PathName(butPtr->tkwin),
          ButtonWidgetCmd, (ClientData) butPtr, ButtonCmdDeletedProc);
    butPtr->interp = interp;
    butPtr->type = type;
    butPtr->text = NULL;
    butPtr->underline = -1;
    butPtr->textVarName = NULL;
    butPtr->bitmap = None;
    butPtr->imageString = NULL;
    butPtr->image = NULL;
    butPtr->selectImageString = NULL;
    butPtr->selectImage = NULL;
    butPtr->state = tkNormalUid;
    butPtr->normalBorder = NULL;
    butPtr->activeBorder = NULL;
    butPtr->borderWidth = 0;
    butPtr->relief = TK_RELIEF_FLAT;
    butPtr->highlightWidth = 0;
    butPtr->highlightBorder = NULL;
    butPtr->highlightColorPtr = NULL;
    butPtr->inset = 0;
    butPtr->tkfont = NULL;
    butPtr->normalFg = NULL;
    butPtr->activeFg = NULL;
    butPtr->disabledFg = NULL;
    butPtr->normalTextGC = None;
    butPtr->activeTextGC = None;
    butPtr->gray = None;
    butPtr->disabledGC = None;
    butPtr->copyGC = None;
    butPtr->widthString = NULL;
    butPtr->heightString = NULL;
    butPtr->width = 0;
    butPtr->height = 0;
    butPtr->wrapLength = 0;
    butPtr->padX = 0;
    butPtr->padY = 0;
    butPtr->anchor = TK_ANCHOR_CENTER;
    butPtr->justify = TK_JUSTIFY_CENTER;
    butPtr->textLayout = NULL;
    butPtr->indicatorOn = 0;
    butPtr->selectBorder = NULL;
    butPtr->indicatorSpace = 0;
    butPtr->indicatorDiameter = 0;
    butPtr->defaultState = tkDisabledUid;
    butPtr->selVarName = NULL;
    butPtr->onValue = NULL;
    butPtr->offValue = NULL;
    butPtr->cursor = None;
    butPtr->command = NULL;
    butPtr->takeFocus = NULL;
    butPtr->flags = 0;

    Tk_CreateEventHandler(butPtr->tkwin,
          ExposureMask|StructureNotifyMask|FocusChangeMask,
          ButtonEventProc, (ClientData) butPtr);

    if (ConfigureButton(interp, butPtr, argc - 2, argv + 2,
          configFlags[type]) != TCL_OK) {
      Tk_DestroyWindow(butPtr->tkwin);
      return TCL_ERROR;
    }

    interp->result = Tk_PathName(butPtr->tkwin);
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * ButtonWidgetCmd --
 *
 *    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
ButtonWidgetCmd(clientData, interp, argc, argv)
    ClientData clientData;    /* Information about button widget. */
    Tcl_Interp *interp;       /* Current interpreter. */
    int argc;                 /* Number of arguments. */
    char **argv;        /* Argument strings. */
{
    register TkButton *butPtr = (TkButton *) clientData;
    int result = TCL_OK;
    size_t length;
    int c;

    if (argc < 2) {
      sprintf(interp->result,
            "wrong # args: should be \"%.50s option ?arg arg ...?\"",
            argv[0]);
      return TCL_ERROR;
    }
    Tcl_Preserve((ClientData) butPtr);
    c = argv[1][0];
    length = strlen(argv[1]);

    if ((c == 'c') && (strncmp(argv[1], "cget", length) == 0)
          && (length >= 2)) {
      if (argc != 3) {
          Tcl_AppendResult(interp, "wrong # args: should be \"",
                argv[0], " cget option\"",
                (char *) NULL);
          goto error;
      }
      result = Tk_ConfigureValue(interp, butPtr->tkwin, tkpButtonConfigSpecs,
            (char *) butPtr, argv[2], configFlags[butPtr->type]);
    } else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)
          && (length >= 2)) {
      if (argc == 2) {
          result = Tk_ConfigureInfo(interp, butPtr->tkwin,
                tkpButtonConfigSpecs, (char *) butPtr, (char *) NULL,
                configFlags[butPtr->type]);
      } else if (argc == 3) {
          result = Tk_ConfigureInfo(interp, butPtr->tkwin,
                tkpButtonConfigSpecs, (char *) butPtr, argv[2],
                configFlags[butPtr->type]);
      } else {
          result = ConfigureButton(interp, butPtr, argc-2, argv+2,
                configFlags[butPtr->type] | TK_CONFIG_ARGV_ONLY);
      }
    } else if ((c == 'd') && (strncmp(argv[1], "deselect", length) == 0)
          && (butPtr->type >= TYPE_CHECK_BUTTON)) {
      if (argc > 2) {
          sprintf(interp->result,
                "wrong # args: should be \"%.50s deselect\"",
                argv[0]);
          goto error;
      }
      if (butPtr->type == TYPE_CHECK_BUTTON) {
          if (Tcl_SetVar(interp, butPtr->selVarName, butPtr->offValue,
                TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG) == NULL) {
            result = TCL_ERROR;
          }
      } else if (butPtr->flags & SELECTED) {
          if (Tcl_SetVar(interp, butPtr->selVarName, "",
                TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG) == NULL) {
            result = TCL_ERROR;
          };
      }
    } else if ((c == 'f') && (strncmp(argv[1], "flash", length) == 0)
          && (butPtr->type != TYPE_LABEL)) {
      int i;

      if (argc > 2) {
          sprintf(interp->result,
                "wrong # args: should be \"%.50s flash\"",
                argv[0]);
          goto error;
      }
      if (butPtr->state != tkDisabledUid) {
          for (i = 0; i < 4; i++) {
            butPtr->state = (butPtr->state == tkNormalUid)
                  ? tkActiveUid : tkNormalUid;
            Tk_SetBackgroundFromBorder(butPtr->tkwin,
                  (butPtr->state == tkActiveUid) ? butPtr->activeBorder
                  : butPtr->normalBorder);
            TkpDisplayButton((ClientData) butPtr);

            /*
             * Special note: must cancel any existing idle handler
             * for TkpDisplayButton;  it's no longer needed, and TkpDisplayButton
             * cleared the REDRAW_PENDING flag.
             */

            Tcl_CancelIdleCall(TkpDisplayButton, (ClientData) butPtr);
            XFlush(butPtr->display);
            Tcl_Sleep(50);
          }
      }
    } else if ((c == 'i') && (strncmp(argv[1], "invoke", length) == 0)
          && (butPtr->type > TYPE_LABEL)) {
      if (argc > 2) {
          sprintf(interp->result,
                "wrong # args: should be \"%.50s invoke\"",
                argv[0]);
          goto error;
      }
      if (butPtr->state != tkDisabledUid) {
          result = TkInvokeButton(butPtr);
      }
    } else if ((c == 's') && (strncmp(argv[1], "select", length) == 0)
          && (butPtr->type >= TYPE_CHECK_BUTTON)) {
      if (argc > 2) {
          sprintf(interp->result,
                "wrong # args: should be \"%.50s select\"",
                argv[0]);
          goto error;
      }
      if (Tcl_SetVar(interp, butPtr->selVarName, butPtr->onValue,
            TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG) == NULL) {
          result = TCL_ERROR;
      }
    } else if ((c == 't') && (strncmp(argv[1], "toggle", length) == 0)
          && (length >= 2) && (butPtr->type == TYPE_CHECK_BUTTON)) {
      if (argc > 2) {
          sprintf(interp->result,
                "wrong # args: should be \"%.50s toggle\"",
                argv[0]);
          goto error;
      }
      if (butPtr->flags & SELECTED) {
          if (Tcl_SetVar(interp, butPtr->selVarName, butPtr->offValue,
                TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG) == NULL) {
            result = TCL_ERROR;
          }
      } else {
          if (Tcl_SetVar(interp, butPtr->selVarName, butPtr->onValue,
                TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG) == NULL) {
            result = TCL_ERROR;
          }
      }
    } else {
      sprintf(interp->result,
            "bad option \"%.50s\": must be %s", argv[1],
            optionStrings[butPtr->type]);
      goto error;
    }
    Tcl_Release((ClientData) butPtr);
    return result;

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

static void
DestroyButton(butPtr)
    TkButton *butPtr;         /* Info about button widget. */
{
    /*
     * Free up all the stuff that requires special handling, then
     * let Tk_FreeOptions handle all the standard option-related
     * stuff.
     */

    if (butPtr->textVarName != NULL) {
      Tcl_UntraceVar(butPtr->interp, butPtr->textVarName,
            TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
            ButtonTextVarProc, (ClientData) butPtr);
    }
    if (butPtr->image != NULL) {
      Tk_FreeImage(butPtr->image);
    }
    if (butPtr->selectImage != NULL) {
      Tk_FreeImage(butPtr->selectImage);
    }
    if (butPtr->normalTextGC != None) {
      Tk_FreeGC(butPtr->display, butPtr->normalTextGC);
    }
    if (butPtr->activeTextGC != None) {
      Tk_FreeGC(butPtr->display, butPtr->activeTextGC);
    }
    if (butPtr->gray != None) {
      Tk_FreeBitmap(butPtr->display, butPtr->gray);
    }
    if (butPtr->disabledGC != None) {
      Tk_FreeGC(butPtr->display, butPtr->disabledGC);
    }
    if (butPtr->copyGC != None) {
      Tk_FreeGC(butPtr->display, butPtr->copyGC);
    }
    if (butPtr->selVarName != NULL) {
      Tcl_UntraceVar(butPtr->interp, butPtr->selVarName,
            TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
            ButtonVarProc, (ClientData) butPtr);
    }
    Tk_FreeTextLayout(butPtr->textLayout);
    Tk_FreeOptions(tkpButtonConfigSpecs, (char *) butPtr, butPtr->display,
          configFlags[butPtr->type]);
    Tcl_EventuallyFree((ClientData)butPtr, TCL_DYNAMIC);
}

/*
 *----------------------------------------------------------------------
 *
 * ConfigureButton --
 *
 *    This procedure is called to process an argv/argc list, plus
 *    the Tk option database, in order to configure (or
 *    reconfigure) a button widget.
 *
 * Results:
 *    The return value is a standard Tcl result.  If TCL_ERROR is
 *    returned, then interp->result contains an error message.
 *
 * Side effects:
 *    Configuration information, such as text string, colors, font,
 *    etc. get set for butPtr;  old resources get freed, if there
 *    were any.  The button is redisplayed.
 *
 *----------------------------------------------------------------------
 */

static int
ConfigureButton(interp, butPtr, argc, argv, flags)
    Tcl_Interp *interp;       /* Used for error reporting. */
    register TkButton *butPtr;      /* Information about widget;  may or may
                         * not already have values for some fields. */
    int argc;                 /* Number of valid entries in argv. */
    char **argv;        /* Arguments. */
    int flags;                /* Flags to pass to Tk_ConfigureWidget. */
{
    Tk_Image image;

    /*
     * Eliminate any existing trace on variables monitored by the button.
     */

    if (butPtr->textVarName != NULL) {
      Tcl_UntraceVar(interp, butPtr->textVarName, 
            TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
            ButtonTextVarProc, (ClientData) butPtr);
    }
    if (butPtr->selVarName != NULL) {
      Tcl_UntraceVar(interp, butPtr->selVarName, 
            TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
            ButtonVarProc, (ClientData) butPtr);
    }

    

    if (Tk_ConfigureWidget(interp, butPtr->tkwin, tkpButtonConfigSpecs,
          argc, argv, (char *) butPtr, flags) != TCL_OK) {
      return TCL_ERROR;
    }

    /*
     * A few options need special processing, such as setting the
     * background from a 3-D border, or filling in complicated
     * defaults that couldn't be specified to Tk_ConfigureWidget.
     */

    if ((butPtr->state == tkActiveUid) && !Tk_StrictMotif(butPtr->tkwin)) {
      Tk_SetBackgroundFromBorder(butPtr->tkwin, butPtr->activeBorder);
    } else {
      Tk_SetBackgroundFromBorder(butPtr->tkwin, butPtr->normalBorder);
      if ((butPtr->state != tkNormalUid) && (butPtr->state != tkActiveUid)
            && (butPtr->state != tkDisabledUid)) {
          Tcl_AppendResult(interp, "bad state value \"", butPtr->state,
                "\": must be normal, active, or disabled", (char *) NULL);
          butPtr->state = tkNormalUid;
          return TCL_ERROR;
      }
    }

    if ((butPtr->defaultState != tkActiveUid)
          && (butPtr->defaultState != tkDisabledUid)
          && (butPtr->defaultState != tkNormalUid)) {
      Tcl_AppendResult(interp, "bad -default value \"", butPtr->defaultState,
            "\": must be normal, active, or disabled", (char *) NULL);
      butPtr->defaultState = tkDisabledUid;
      return TCL_ERROR;
    }

    if (butPtr->highlightWidth < 0) {
      butPtr->highlightWidth = 0;
    }

    if (butPtr->padX < 0) {
      butPtr->padX = 0;
    }
    if (butPtr->padY < 0) {
      butPtr->padY = 0;
    }

    if (butPtr->type >= TYPE_CHECK_BUTTON) {
      char *value;

      if (butPtr->selVarName == NULL) {
          butPtr->selVarName = (char *) ckalloc((unsigned)
                (strlen(Tk_Name(butPtr->tkwin)) + 1));
          strcpy(butPtr->selVarName, Tk_Name(butPtr->tkwin));
      }

      /*
       * Select the button if the associated variable has the
       * appropriate value, initialize the variable if it doesn't
       * exist, then set a trace on the variable to monitor future
       * changes to its value.
       */

      value = Tcl_GetVar(interp, butPtr->selVarName, TCL_GLOBAL_ONLY);
      butPtr->flags &= ~SELECTED;
      if (value != NULL) {
          if (strcmp(value, butPtr->onValue) == 0) {
            butPtr->flags |= SELECTED;
          }
      } else {
          if (Tcl_SetVar(interp, butPtr->selVarName,
                (butPtr->type == TYPE_CHECK_BUTTON) ? butPtr->offValue : "",
                TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG) == NULL) {
            return TCL_ERROR;
          }
      }
      Tcl_TraceVar(interp, butPtr->selVarName,
            TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
            ButtonVarProc, (ClientData) butPtr);
    }

    /*
     * Get the images for the widget, if there are any.  Allocate the
     * new images before freeing the old ones, so that the reference
     * counts don't go to zero and cause image data to be discarded.
     */

    if (butPtr->imageString != NULL) {
      image = Tk_GetImage(butPtr->interp, butPtr->tkwin,
            butPtr->imageString, ButtonImageProc, (ClientData) butPtr);
      if (image == NULL) {
          return TCL_ERROR;
      }
    } else {
      image = NULL;
    }
    if (butPtr->image != NULL) {
      Tk_FreeImage(butPtr->image);
    }
    butPtr->image = image;
    if (butPtr->selectImageString != NULL) {
      image = Tk_GetImage(butPtr->interp, butPtr->tkwin,
            butPtr->selectImageString, ButtonSelectImageProc,
            (ClientData) butPtr);
      if (image == NULL) {
          return TCL_ERROR;
      }
    } else {
      image = NULL;
    }
    if (butPtr->selectImage != NULL) {
      Tk_FreeImage(butPtr->selectImage);
    }
    butPtr->selectImage = image;

    if ((butPtr->image == NULL) && (butPtr->bitmap == None)
          && (butPtr->textVarName != NULL)) {
      /*
       * The button must display the value of a variable: set up a trace
       * on the variable's value, create the variable if it doesn't
       * exist, and fetch its current value.
       */

      char *value;

      value = Tcl_GetVar(interp, butPtr->textVarName, TCL_GLOBAL_ONLY);
#ifdef TK_KANJI_OK
      if (value == NULL) {
          if (Tcl_SetVar(interp, butPtr->textVarName,
                     Tcl_DecodeWStr(interp, butPtr->text, NULL),
                     TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG) == NULL) {
            return TCL_ERROR;
          }
      } else {
          wchar *old = butPtr->text;
          butPtr->text = Tcl_GetWStr(NULL, value, NULL);
          if (old != NULL) {
              Tcl_FreeWStr(old);
          }
      }
#else
      if (value == NULL) {
          if (Tcl_SetVar(interp, butPtr->textVarName, butPtr->text,
                TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG) == NULL) {
            return TCL_ERROR;
          }
      } else {
          if (butPtr->text != NULL) {
            ckfree(butPtr->text);
          }
          butPtr->text = (char *) ckalloc((unsigned) (strlen(value) + 1));
          strcpy(butPtr->text, value);
      }
#endif /* TK_KANJI_OK */
      Tcl_TraceVar(interp, butPtr->textVarName,
            TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
            ButtonTextVarProc, (ClientData) butPtr);
    }

    if ((butPtr->bitmap != None) || (butPtr->image != NULL)) {
      if (Tk_GetPixels(interp, butPtr->tkwin, butPtr->widthString,
            &butPtr->width) != TCL_OK) {
          widthError:
          Tcl_AddErrorInfo(interp, "\n    (processing -width option)");
          return TCL_ERROR;
      }
      if (Tk_GetPixels(interp, butPtr->tkwin, butPtr->heightString,
            &butPtr->height) != TCL_OK) {
          heightError:
          Tcl_AddErrorInfo(interp, "\n    (processing -height option)");
          return TCL_ERROR;
      }
    } else {
      if (Tcl_GetInt(interp, butPtr->widthString, &butPtr->width)
            != TCL_OK) {
          goto widthError;
      }
      if (Tcl_GetInt(interp, butPtr->heightString, &butPtr->height)
            != TCL_OK) {
          goto heightError;
      }
    }
    
    TkButtonWorldChanged((ClientData) butPtr);
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * TkButtonWorldChanged --
 *
 *      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:
 *      Button will be relayed out and redisplayed.
 *
 *---------------------------------------------------------------------------
 */
 
void
TkButtonWorldChanged(instanceData)
    ClientData instanceData;  /* Information about widget. */
{
    XGCValues gcValues;
    GC newGC;
    unsigned long mask;
    TkButton *butPtr;

    butPtr = (TkButton *) instanceData;

    /*
     * Recompute GCs.
     */

    gcValues.font = Tk_FontId(butPtr->tkfont);
    gcValues.foreground = butPtr->normalFg->pixel;
    gcValues.background = Tk_3DBorderColor(butPtr->normalBorder)->pixel;
    
    /*
     * Note: GraphicsExpose events are disabled in normalTextGC because it's
     * used to copy stuff from an off-screen pixmap onto the screen (we know
     * that there's no problem with obscured areas).
     */

    gcValues.graphics_exposures = False;
    mask = GCForeground | GCBackground | GCFont | GCGraphicsExposures;
    newGC = Tk_GetGC(butPtr->tkwin, mask, &gcValues);
    if (butPtr->normalTextGC != None) {
      Tk_FreeGC(butPtr->display, butPtr->normalTextGC);
    }
    butPtr->normalTextGC = newGC;

    if (butPtr->activeFg != NULL) {
      gcValues.font = Tk_FontId(butPtr->tkfont);
      gcValues.foreground = butPtr->activeFg->pixel;
      gcValues.background = Tk_3DBorderColor(butPtr->activeBorder)->pixel;
      mask = GCForeground | GCBackground | GCFont;
      newGC = Tk_GetGC(butPtr->tkwin, mask, &gcValues);
      if (butPtr->activeTextGC != None) {
          Tk_FreeGC(butPtr->display, butPtr->activeTextGC);
      }
      butPtr->activeTextGC = newGC;
    }

    if (butPtr->type != TYPE_LABEL) {
      gcValues.font = Tk_FontId(butPtr->tkfont);
      gcValues.background = Tk_3DBorderColor(butPtr->normalBorder)->pixel;
      if ((butPtr->disabledFg != NULL) && (butPtr->imageString == NULL)) {
          gcValues.foreground = butPtr->disabledFg->pixel;
          mask = GCForeground | GCBackground | GCFont;
      } else {
          gcValues.foreground = gcValues.background;
          mask = GCForeground;
          if (butPtr->gray == None) {
            butPtr->gray = Tk_GetBitmap(NULL, butPtr->tkwin, 
                  Tk_GetUid("gray50"));
          }
          if (butPtr->gray != None) {
            gcValues.fill_style = FillStippled;
            gcValues.stipple = butPtr->gray;
            mask |= GCFillStyle | GCStipple;
          }
      }
      newGC = Tk_GetGC(butPtr->tkwin, mask, &gcValues);
      if (butPtr->disabledGC != None) {
          Tk_FreeGC(butPtr->display, butPtr->disabledGC);
      }
      butPtr->disabledGC = newGC;
    }

    if (butPtr->copyGC == None) {
      butPtr->copyGC = Tk_GetGC(butPtr->tkwin, 0, &gcValues);
    }

    TkpComputeButtonGeometry(butPtr);

    /*
     * Lastly, arrange for the button to be redisplayed.
     */

    if (Tk_IsMapped(butPtr->tkwin) && !(butPtr->flags & REDRAW_PENDING)) {
      Tcl_DoWhenIdle(TkpDisplayButton, (ClientData) butPtr);
      butPtr->flags |= REDRAW_PENDING;
    }
}

/*
 *--------------------------------------------------------------
 *
 * ButtonEventProc --
 *
 *    This procedure is invoked by the Tk dispatcher for various
 *    events on buttons.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    When the window gets deleted, internal structures get
 *    cleaned up.  When it gets exposed, it is redisplayed.
 *
 *--------------------------------------------------------------
 */

static void
ButtonEventProc(clientData, eventPtr)
    ClientData clientData;    /* Information about window. */
    XEvent *eventPtr;         /* Information about event. */
{
    TkButton *butPtr = (TkButton *) clientData;
    if ((eventPtr->type == Expose) && (eventPtr->xexpose.count == 0)) {
      goto redraw;
    } else if (eventPtr->type == ConfigureNotify) {
      /*
       * Must redraw after size changes, since layout could have changed
       * and borders will need to be redrawn.
       */

      goto redraw;
    } else if (eventPtr->type == DestroyNotify) {
      TkpDestroyButton(butPtr);
      if (butPtr->tkwin != NULL) {
          butPtr->tkwin = NULL;
            Tcl_DeleteCommandFromToken(butPtr->interp, butPtr->widgetCmd);
      }
      if (butPtr->flags & REDRAW_PENDING) {
          Tcl_CancelIdleCall(TkpDisplayButton, (ClientData) butPtr);
      }
      DestroyButton(butPtr);
    } else if (eventPtr->type == FocusIn) {
      if (eventPtr->xfocus.detail != NotifyInferior) {
          butPtr->flags |= GOT_FOCUS;
          if (butPtr->highlightWidth > 0) {
            goto redraw;
          }
      }
    } else if (eventPtr->type == FocusOut) {
      if (eventPtr->xfocus.detail != NotifyInferior) {
          butPtr->flags &= ~GOT_FOCUS;
          if (butPtr->highlightWidth > 0) {
            goto redraw;
          }
      }
    }
    return;

    redraw:
    if ((butPtr->tkwin != NULL) && !(butPtr->flags & REDRAW_PENDING)) {
      Tcl_DoWhenIdle(TkpDisplayButton, (ClientData) butPtr);
      butPtr->flags |= REDRAW_PENDING;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * ButtonCmdDeletedProc --
 *
 *    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
ButtonCmdDeletedProc(clientData)
    ClientData clientData;    /* Pointer to widget record for widget. */
{
    TkButton *butPtr = (TkButton *) clientData;
    Tk_Window tkwin = butPtr->tkwin;

    /*
     * 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 (tkwin != NULL) {
      butPtr->tkwin = NULL;
      Tk_DestroyWindow(tkwin);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TkInvokeButton --
 *
 *    This procedure is called to carry out the actions associated
 *    with a button, such as invoking a Tcl command or setting a
 *    variable.  This procedure is invoked, for example, when the
 *    button is invoked via the mouse.
 *
 * Results:
 *    A standard Tcl return value.  Information is also left in
 *    interp->result.
 *
 * Side effects:
 *    Depends on the button and its associated command.
 *
 *----------------------------------------------------------------------
 */

int
TkInvokeButton(butPtr)
    register TkButton *butPtr;            /* Information about button. */
{
    if (butPtr->type == TYPE_CHECK_BUTTON) {
      if (butPtr->flags & SELECTED) {
          if (Tcl_SetVar(butPtr->interp, butPtr->selVarName, butPtr->offValue,
                TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG) == NULL) {
            return TCL_ERROR;
          }
      } else {
          if (Tcl_SetVar(butPtr->interp, butPtr->selVarName, butPtr->onValue,
                TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG) == NULL) {
            return TCL_ERROR;
          }
      }
    } else if (butPtr->type == TYPE_RADIO_BUTTON) {
      if (Tcl_SetVar(butPtr->interp, butPtr->selVarName, butPtr->onValue,
            TCL_GLOBAL_ONLY|TCL_LEAVE_ERR_MSG) == NULL) {
          return TCL_ERROR;
      }
    }
    if ((butPtr->type != TYPE_LABEL) && (butPtr->command != NULL)) {
      return TkCopyAndGlobalEval(butPtr->interp, butPtr->command);
    }
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * ButtonVarProc --
 *
 *    This procedure is invoked when someone changes the
 *    state variable associated with a radio button.  Depending
 *    on the new value of the button's variable, the button
 *    may be selected or deselected.
 *
 * Results:
 *    NULL is always returned.
 *
 * Side effects:
 *    The button may become selected or deselected.
 *
 *--------------------------------------------------------------
 */

      /* ARGSUSED */
static char *
ButtonVarProc(clientData, interp, name1, name2, flags)
    ClientData clientData;    /* Information about button. */
    Tcl_Interp *interp;       /* Interpreter containing variable. */
    char *name1;        /* Name of variable. */
    char *name2;        /* Second part of variable name. */
    int flags;                /* Information about what happened. */
{
    register TkButton *butPtr = (TkButton *) clientData;
    char *value;

    /*
     * If the variable is being unset, then just re-establish the
     * trace unless the whole interpreter is going away.
     */

    if (flags & TCL_TRACE_UNSETS) {
      butPtr->flags &= ~SELECTED;
      if ((flags & TCL_TRACE_DESTROYED) && !(flags & TCL_INTERP_DESTROYED)) {
          Tcl_TraceVar(interp, butPtr->selVarName,
                TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                ButtonVarProc, clientData);
      }
      goto redisplay;
    }

    /*
     * Use the value of the variable to update the selected status of
     * the button.
     */

    value = Tcl_GetVar(interp, butPtr->selVarName, TCL_GLOBAL_ONLY);
    if (value == NULL) {
      value = "";
    }
    if (strcmp(value, butPtr->onValue) == 0) {
      if (butPtr->flags & SELECTED) {
          return (char *) NULL;
      }
      butPtr->flags |= SELECTED;
    } else if (butPtr->flags & SELECTED) {
      butPtr->flags &= ~SELECTED;
    } else {
      return (char *) NULL;
    }

    redisplay:
    if ((butPtr->tkwin != NULL) && Tk_IsMapped(butPtr->tkwin)
          && !(butPtr->flags & REDRAW_PENDING)) {
      Tcl_DoWhenIdle(TkpDisplayButton, (ClientData) butPtr);
      butPtr->flags |= REDRAW_PENDING;
    }
    return (char *) NULL;
}

/*
 *--------------------------------------------------------------
 *
 * ButtonTextVarProc --
 *
 *    This procedure is invoked when someone changes the variable
 *    whose contents are to be displayed in a button.
 *
 * Results:
 *    NULL is always returned.
 *
 * Side effects:
 *    The text displayed in the button will change to match the
 *    variable.
 *
 *--------------------------------------------------------------
 */

      /* ARGSUSED */
static char *
ButtonTextVarProc(clientData, interp, name1, name2, flags)
    ClientData clientData;    /* Information about button. */
    Tcl_Interp *interp;       /* Interpreter containing variable. */
    char *name1;        /* Not used. */
    char *name2;        /* Not used. */
    int flags;                /* Information about what happened. */
{
    register TkButton *butPtr = (TkButton *) clientData;
    char *value;
#ifdef TK_KANJI_OK
    wchar *old = butPtr->text;
#endif /* TK_KANJI_OK */

    /*
     * 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)) {

#ifdef TK_KANJI_OK
          Tcl_SetVar(interp, butPtr->textVarName,
                   Tcl_DecodeWStr(interp, butPtr->text, NULL),
                   TCL_GLOBAL_ONLY);
#else     Tcl_SetVar(interp, butPtr->textVarName, butPtr->text,
                TCL_GLOBAL_ONLY);
#endif /* TK_KANJI_OK */
          Tcl_TraceVar(interp, butPtr->textVarName,
                TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                ButtonTextVarProc, clientData);
      }
      return (char *) NULL;
    }

    value = Tcl_GetVar(interp, butPtr->textVarName, TCL_GLOBAL_ONLY);
    if (value == NULL) {
      value = "";
    }
#ifdef TK_KANJI_OK
    butPtr->text = Tcl_GetWStr(NULL, value, NULL);
    if (old != NULL) {
      Tcl_FreeWStr(old);
    }
#else
    if (butPtr->text != NULL) {
      ckfree(butPtr->text);
    }
    butPtr->text = (char *) ckalloc((unsigned) (strlen(value) + 1));
    strcpy(butPtr->text, value);
#endif /* TK_KANJI_OK */
    TkpComputeButtonGeometry(butPtr);

    if ((butPtr->tkwin != NULL) && Tk_IsMapped(butPtr->tkwin)
          && !(butPtr->flags & REDRAW_PENDING)) {
      Tcl_DoWhenIdle(TkpDisplayButton, (ClientData) butPtr);
      butPtr->flags |= REDRAW_PENDING;
    }
    return (char *) NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * ButtonImageProc --
 *
 *    This procedure is invoked by the image code whenever the manager
 *    for an image does something that affects the size of contents
 *    of an image displayed in a button.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Arranges for the button to get redisplayed.
 *
 *----------------------------------------------------------------------
 */

static void
ButtonImageProc(clientData, x, y, width, height, imgWidth, imgHeight)
    ClientData clientData;          /* Pointer to widget record. */
    int x, y;                       /* Upper left pixel (within image)
                               * that must be redisplayed. */
    int width, height;              /* Dimensions of area to redisplay
                               * (may be <= 0). */
    int imgWidth, imgHeight;        /* New dimensions of image. */
{
    register TkButton *butPtr = (TkButton *) clientData;

    if (butPtr->tkwin != NULL) {
      TkpComputeButtonGeometry(butPtr);
      if (Tk_IsMapped(butPtr->tkwin) && !(butPtr->flags & REDRAW_PENDING)) {
          Tcl_DoWhenIdle(TkpDisplayButton, (ClientData) butPtr);
          butPtr->flags |= REDRAW_PENDING;
      }
    }
}

/*
 *----------------------------------------------------------------------
 *
 * ButtonSelectImageProc --
 *
 *    This procedure is invoked by the image code whenever the manager
 *    for an image does something that affects the size of contents
 *    of the image displayed in a button when it is selected.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    May arrange for the button to get redisplayed.
 *
 *----------------------------------------------------------------------
 */

static void
ButtonSelectImageProc(clientData, x, y, width, height, imgWidth, imgHeight)
    ClientData clientData;          /* Pointer to widget record. */
    int x, y;                       /* Upper left pixel (within image)
                               * that must be redisplayed. */
    int width, height;              /* Dimensions of area to redisplay
                               * (may be <= 0). */
    int imgWidth, imgHeight;        /* New dimensions of image. */
{
    register TkButton *butPtr = (TkButton *) clientData;

    /*
     * Don't recompute geometry:  it's controlled by the primary image.
     */

    if ((butPtr->flags & SELECTED) && (butPtr->tkwin != NULL)
          && Tk_IsMapped(butPtr->tkwin)
          && !(butPtr->flags & REDRAW_PENDING)) {
      Tcl_DoWhenIdle(TkpDisplayButton, (ClientData) butPtr);
      butPtr->flags |= REDRAW_PENDING;
    }
}

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