Import Micropolis from http://www.donhopkins.com/home/micropolis/

[micropolis] / src / tk / tkmenu.c

/* 
 * tkMenu.c --
 *
 *      This module implements menus for the Tk toolkit.  The menus
 *      support normal button entries, plus check buttons, radio
 *      buttons, iconic forms of all of the above, and separator
 *      entries.
 *
 * Copyright 1990-1992 Regents of the University of California.
 * Permission to use, copy, modify, and distribute this
 * software and its documentation for any purpose and without
 * fee is hereby granted, provided that the above copyright
 * notice appear in all copies.  The University of California
 * makes no representations about the suitability of this
 * software for any purpose.  It is provided "as is" without
 * express or implied warranty.
 */

#ifndef lint
static char rcsid[] = "$Header: /user6/ouster/wish/RCS/tkMenu.c,v 1.37 92/08/24 09:24:04 ouster Exp $ SPRITE (Berkeley)";
#endif

#include "tkconfig.h"
#include "default.h"
#include "tkint.h"

/*
 * One of the following data structures is kept for each entry of each
 * menu managed by this file:
 */

typedef struct MenuEntry {
    int type;                   /* Type of menu entry;  see below for
                                 * valid types. */
    struct Menu *menuPtr;       /* Menu with which this entry is associated. */
    char *label;                /* Main text label displayed in entry (NULL
                                 * if no label).  Malloc'ed. */
    int labelLength;            /* Number of non-NULL characters in label. */
    int underline;              /* Index of character to underline. */
    Pixmap bitmap;              /* Bitmap to display in menu entry, or None.
                                 * If not None then label is ignored. */
    char *accel;                /* Accelerator string displayed at right
                                 * of menu entry.  NULL means no such
                                 * accelerator.  Malloc'ed. */
    int accelLength;            /* Number of non-NULL characters in
                                 * accelerator. */

    /*
     * Information related to displaying entry:
     */

    Tk_Uid state;               /* State of button for display purposes:
                                 * normal, active, or disabled. */
    int height;                 /* Number of pixels occupied by entry in
                                 * vertical dimension. */
    int y;                      /* Y-coordinate of topmost pixel in entry. */
    int selectorDiameter;       /* Size of selector display, in pixels. */
    Tk_3DBorder border;         /* Structure used to draw background for
                                 * entry.  NULL means use overall border
                                 * for menu. */
    Tk_3DBorder activeBorder;   /* Used to draw background and border when
                                 * element is active.  NULL means use
                                 * activeBorder from menu. */
    XFontStruct *fontPtr;       /* Text font for menu entries.  NULL means
                                 * use overall font for menu. */
    GC textGC;                  /* GC for drawing text in entry.  NULL means
                                 * use overall textGC for menu. */
    GC activeGC;                /* GC for drawing text in entry when active.
                                 * NULL means use overall activeGC for
                                 * menu. */
    GC disabledGC;              /* Used to produce disabled effect for entry.
                                 * NULL means use overall disabledGC from
                                 * menu structure.  See comments for
                                 * disabledFg in menu structure for more
                                 * information. */

    /*
     * Information used to implement this entry's action:
     */

    char *command;              /* Command to invoke when entry is invoked.
                                 * Malloc'ed. */
    char *name;                 /* Name of variable (for check buttons and
                                 * radio buttons) or menu (for cascade
                                 * entries).  Malloc'ed.*/
    char *onValue;              /* Value to store in variable when selected
                                 * (only for radio and check buttons).
                                 * Malloc'ed. */
    char *offValue;             /* Value to store in variable when not
                                 * selected (only for check buttons).
                                 * Malloc'ed. */

    /*
     * Miscellaneous information:
     */

    int flags;                  /* Various flags.  See below for definitions. */
} MenuEntry;

/*
 * Flag values defined for menu entries:
 *
 * ENTRY_SELECTED:              Non-zero means this is a radio or check
 *                              button and that it should be drawn in
 *                              the "selected" state.
 * ENTRY_NEEDS_REDISPLAY:       Non-zero means the entry should be redisplayed.
 */

#define ENTRY_SELECTED          1
#define ENTRY_NEEDS_REDISPLAY   4

/*
 * Types defined for MenuEntries:
 */

#define COMMAND_ENTRY           0
#define SEPARATOR_ENTRY         1
#define CHECK_BUTTON_ENTRY      2
#define RADIO_BUTTON_ENTRY      3
#define CASCADE_ENTRY           4

/*
 * Mask bits for above types:
 */

#define COMMAND_MASK            TK_CONFIG_USER_BIT
#define SEPARATOR_MASK          (TK_CONFIG_USER_BIT << 1)
#define CHECK_BUTTON_MASK       (TK_CONFIG_USER_BIT << 2)
#define RADIO_BUTTON_MASK       (TK_CONFIG_USER_BIT << 3)
#define CASCADE_MASK            (TK_CONFIG_USER_BIT << 4)
#define ALL_MASK                (COMMAND_MASK | SEPARATOR_MASK \
        | CHECK_BUTTON_MASK | RADIO_BUTTON_MASK | CASCADE_MASK)

/*
 * Configuration specs for individual menu entries:
 */

static Tk_ConfigSpec entryConfigSpecs[] = {
    {TK_CONFIG_BORDER, "-activebackground", (char *) NULL, (char *) NULL,
        DEF_MENU_ENTRY_ACTIVE_BG, Tk_Offset(MenuEntry, activeBorder),
        COMMAND_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|CASCADE_MASK
        |TK_CONFIG_NULL_OK},
    {TK_CONFIG_STRING, "-accelerator", (char *) NULL, (char *) NULL,
        DEF_MENU_ENTRY_ACCELERATOR, Tk_Offset(MenuEntry, accel),
        COMMAND_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|CASCADE_MASK},
    {TK_CONFIG_BORDER, "-background", (char *) NULL, (char *) NULL,
        DEF_MENU_ENTRY_BG, Tk_Offset(MenuEntry, border),
        COMMAND_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|CASCADE_MASK
        |TK_CONFIG_NULL_OK},
#if defined(USE_XPM3)
    {TK_CONFIG_PIXMAP, "-bitmap", (char *) NULL, (char *) NULL,
        DEF_MENU_ENTRY_BITMAP, Tk_Offset(MenuEntry, bitmap),
        COMMAND_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|CASCADE_MASK
        |TK_CONFIG_NULL_OK},
#else
    {TK_CONFIG_BITMAP, "-bitmap", (char *) NULL, (char *) NULL,
        DEF_MENU_ENTRY_BITMAP, Tk_Offset(MenuEntry, bitmap),
        COMMAND_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|CASCADE_MASK
        |TK_CONFIG_NULL_OK},
#endif
    {TK_CONFIG_STRING, "-command", (char *) NULL, (char *) NULL,
        DEF_MENU_ENTRY_COMMAND, Tk_Offset(MenuEntry, command),
        COMMAND_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|CASCADE_MASK},
    {TK_CONFIG_FONT, "-font", (char *) NULL, (char *) NULL,
        DEF_MENU_ENTRY_FONT, Tk_Offset(MenuEntry, fontPtr),
        COMMAND_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|CASCADE_MASK
        |TK_CONFIG_NULL_OK},
    {TK_CONFIG_STRING, "-label", (char *) NULL, (char *) NULL,
        DEF_MENU_ENTRY_LABEL, Tk_Offset(MenuEntry, label),
        COMMAND_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|CASCADE_MASK},
    {TK_CONFIG_STRING, "-menu", (char *) NULL, (char *) NULL,
        DEF_MENU_ENTRY_MENU, Tk_Offset(MenuEntry, name), CASCADE_MASK},
    {TK_CONFIG_STRING, "-offvalue", (char *) NULL, (char *) NULL,
        DEF_MENU_ENTRY_OFF_VALUE, Tk_Offset(MenuEntry, offValue),
        CHECK_BUTTON_MASK},
    {TK_CONFIG_UID, "-state", (char *) NULL, (char *) NULL,
        DEF_MENU_ENTRY_STATE, Tk_Offset(MenuEntry, state),
        COMMAND_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|CASCADE_MASK
        |TK_CONFIG_DONT_SET_DEFAULT},
    {TK_CONFIG_STRING, "-onvalue", (char *) NULL, (char *) NULL,
        DEF_MENU_ENTRY_ON_VALUE, Tk_Offset(MenuEntry, onValue),
        CHECK_BUTTON_MASK},
    {TK_CONFIG_STRING, "-value", (char *) NULL, (char *) NULL,
        DEF_MENU_ENTRY_VALUE, Tk_Offset(MenuEntry, onValue),
        RADIO_BUTTON_MASK},
    {TK_CONFIG_STRING, "-variable", (char *) NULL, (char *) NULL,
        DEF_MENU_ENTRY_CHECK_VARIABLE, Tk_Offset(MenuEntry, name),
        CHECK_BUTTON_MASK},
    {TK_CONFIG_STRING, "-variable", (char *) NULL, (char *) NULL,
        DEF_MENU_ENTRY_RADIO_VARIABLE, Tk_Offset(MenuEntry, name),
        RADIO_BUTTON_MASK},
    {TK_CONFIG_INT, "-underline", (char *) NULL, (char *) NULL,
        DEF_MENU_ENTRY_UNDERLINE, Tk_Offset(MenuEntry, underline),
        COMMAND_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|CASCADE_MASK
        |TK_CONFIG_DONT_SET_DEFAULT},
    {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
        (char *) NULL, 0, 0}
};

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

typedef struct Menu {
    Tk_Window tkwin;            /* Window that embodies the pane.  NULL
                                 * means that the window has been destroyed
                                 * but the data structures haven't yet been
                                 * cleaned up.*/
    Tcl_Interp *interp;         /* Interpreter associated with menu. */
    MenuEntry **entries;        /* Array of pointers to all the entries
                                 * in the menu.  NULL means no entries. */
    int numEntries;             /* Number of elements in entries. */
    int active;                 /* Index of active entry.  -1 means
                                 * nothing active. */
    Tk_Uid group;               /* Used to allow event sharing between
                                 * related menus and menu buttons. */

    /*
     * Information used when displaying widget:
     */

    Tk_3DBorder border;         /* Structure used to draw 3-D
                                 * border and background for menu. */
    int borderWidth;            /* Width of border around whole menu. */
    Tk_3DBorder activeBorder;   /* Used to draw background and border for
                                 * active element (if any). */
    int activeBorderWidth;      /* Width of border around active element. */
    XFontStruct *fontPtr;       /* Text font for menu entries. */
    XColor *fg;                 /* Foreground color for entries. */
    GC textGC;                  /* GC for drawing text and other features
                                 * of menu entries. */
    XColor *disabledFg;         /* Foreground color when disabled.  NULL
                                 * means use normalFg with a 50% stipple
                                 * instead. */
    Pixmap gray;                /* Bitmap for drawing disabled entries in
                                 * a stippled fashion.  None means not
                                 * allocated yet. */
    GC disabledGC;              /* Used to produce disabled effect.  If
                                 * disabledFg isn't NULL, this GC is used to
                                 * draw text and icons for disabled entries.
                                 * Otherwise text and icons are drawn with
                                 * normalGC and this GC is used to stipple
                                 * background across them. */
    XColor *activeFg;           /* Foreground color for active entry. */
    GC activeGC;                /* GC for drawing active entry. */
    XColor *selectorFg;         /* Color for selectors in radio and check
                                 * button entries. */
    GC selectorGC;              /* For drawing selectors. */
    int selectorSpace;          /* Number of pixels to allow for displaying
                                 * selectors in menu entries (includes extra
                                 * space around selector). */
    int labelWidth;             /* Number of pixels to allow for displaying
                                 * labels in menu entries. */

    /*
     * Miscellaneous information:
     */

    Cursor cursor;              /* Current cursor for window, or None. */
    MenuEntry *postedCascade;   /* Points to menu entry for cascaded
                                 * submenu that is currently posted, or
                                 * NULL if no submenu posted. */
    int flags;                  /* Various flags;  see below for
                                 * definitions. */
} Menu;

/*
 * Flag bits for menus:
 *
 * REDRAW_PENDING:              Non-zero means a DoWhenIdle handler
 *                              has already been queued to redraw
 *                              this window.
 * RESIZE_PENDING:              Non-zero means a call to ComputeMenuGeometry
 *                              has already been scheduled.
 */

#define REDRAW_PENDING          1
#define RESIZE_PENDING          2

/*
 * Configuration specs valid for the menu as a whole:
 */

static Tk_ConfigSpec configSpecs[] = {
    {TK_CONFIG_BORDER, "-activebackground", "activeBackground", "Foreground",
        DEF_MENU_ACTIVE_BG_COLOR, Tk_Offset(Menu, activeBorder),
        TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_BORDER, "-activebackground", "activeBackground", "Foreground",
        DEF_MENU_ACTIVE_BG_MONO, Tk_Offset(Menu, activeBorder),
        TK_CONFIG_MONO_ONLY},
    {TK_CONFIG_PIXELS, "-activeborderwidth", "activeBorderWidth", "BorderWidth",
        DEF_MENU_ACTIVE_BORDER_WIDTH, Tk_Offset(Menu, activeBorderWidth), 0},
    {TK_CONFIG_COLOR, "-activeforeground", "activeForeground", "Background",
        DEF_MENU_ACTIVE_FG_COLOR, Tk_Offset(Menu, activeFg),
        TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_COLOR, "-activeforeground", "activeForeground", "Background",
        DEF_MENU_ACTIVE_FG_MONO, Tk_Offset(Menu, activeFg),
        TK_CONFIG_MONO_ONLY},
    {TK_CONFIG_BORDER, "-background", "background", "Background",
        DEF_MENU_BG_COLOR, Tk_Offset(Menu, border), TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_BORDER, "-background", "background", "Background",
        DEF_MENU_BG_MONO, Tk_Offset(Menu, border), TK_CONFIG_MONO_ONLY},
    {TK_CONFIG_SYNONYM, "-bd", "borderWidth", (char *) NULL,
        (char *) NULL, 0, 0},
    {TK_CONFIG_SYNONYM, "-bg", "background", (char *) NULL,
        (char *) NULL, 0, 0},
    {TK_CONFIG_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
        DEF_MENU_BORDER_WIDTH, Tk_Offset(Menu, borderWidth), 0},
    {TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
        DEF_MENU_CURSOR, Tk_Offset(Menu, cursor), TK_CONFIG_NULL_OK},
    {TK_CONFIG_COLOR, "-disabledforeground", "disabledForeground",
        "DisabledForeground", DEF_MENU_DISABLED_FG_COLOR,
        Tk_Offset(Menu, disabledFg), TK_CONFIG_COLOR_ONLY|TK_CONFIG_NULL_OK},
    {TK_CONFIG_COLOR, "-disabledforeground", "disabledForeground",
        "DisabledForeground", DEF_MENU_DISABLED_FG_MONO,
        Tk_Offset(Menu, disabledFg), TK_CONFIG_MONO_ONLY|TK_CONFIG_NULL_OK},
    {TK_CONFIG_SYNONYM, "-fg", "foreground", (char *) NULL,
        (char *) NULL, 0, 0},
    {TK_CONFIG_FONT, "-font", "font", "Font",
        DEF_MENU_FONT, Tk_Offset(Menu, fontPtr), 0},
    {TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
        DEF_MENU_FG, Tk_Offset(Menu, fg), 0},
    {TK_CONFIG_COLOR, "-selector", "selector", "Foreground",
        DEF_MENU_SELECTOR_COLOR, Tk_Offset(Menu, selectorFg),
        TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_COLOR, "-selector", "selector", "Foreground",
        DEF_MENU_SELECTOR_MONO, Tk_Offset(Menu, selectorFg),
        TK_CONFIG_MONO_ONLY},
    {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
        (char *) NULL, 0, 0}
};

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

static int              ActivateMenuEntry _ANSI_ARGS_((Menu *menuPtr,
                            int index));
static void             ComputeMenuGeometry _ANSI_ARGS_((
                            ClientData clientData));
static int              ConfigureMenu _ANSI_ARGS_((Tcl_Interp *interp,
                            Menu *menuPtr, int argc, char **argv,
                            int flags));
static int              ConfigureMenuEntry _ANSI_ARGS_((Tcl_Interp *interp,
                            Menu *menuPtr, MenuEntry *mePtr, int index,
                            int argc, char **argv, int flags));
static void             DestroyMenu _ANSI_ARGS_((ClientData clientData));
static void             DestroyMenuEntry _ANSI_ARGS_((ClientData clientData));
static void             DisplayMenu _ANSI_ARGS_((ClientData clientData));
static void             EventuallyRedrawMenu _ANSI_ARGS_((Menu *menuPtr,
                            int index));
static int              GetMenuIndex _ANSI_ARGS_((Tcl_Interp *interp,
                            Menu *menuPtr, char *string, int *indexPtr));
static void             MenuEventProc _ANSI_ARGS_((ClientData clientData,
                            XEvent *eventPtr));
static char *           MenuVarProc _ANSI_ARGS_((ClientData clientData,
                            Tcl_Interp *interp, char *name1, char *name2,
                            int flags));
static int              MenuWidgetCmd _ANSI_ARGS_((ClientData clientData,
                            Tcl_Interp *interp, int argc, char **argv));
static int              PostSubmenu _ANSI_ARGS_((Tcl_Interp *interp,
                            Menu *menuPtr, MenuEntry *mePtr));
\f
/*
 *--------------------------------------------------------------
 *
 * Tk_MenuCmd --
 *
 *      This procedure is invoked to process the "menu" 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_MenuCmd(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. */
{
    Tk_Window tkwin = (Tk_Window) clientData;
    Tk_Window new;
    register Menu *menuPtr;
    XSetWindowAttributes atts;

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

    /*
     * Create the new window.  Set override-redirect so the window
     * manager won't add a border or argue about placement, and set
     * save-under so that the window can pop up and down without a
     * lot of re-drawing.
     */

    new = Tk_CreateWindowFromPath(interp, tkwin, argv[1], "");
    if (new == NULL) {
        return TCL_ERROR;
    }
    atts.override_redirect = True;
    atts.save_under = True;
    Tk_ChangeWindowAttributes(new, CWOverrideRedirect|CWSaveUnder, &atts);

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

    menuPtr = (Menu *) ckalloc(sizeof(Menu));
    menuPtr->tkwin = new;
    menuPtr->interp = interp;
    menuPtr->entries = NULL;
    menuPtr->numEntries = 0;
    menuPtr->active = -1;
    menuPtr->group = NULL; 
    menuPtr->border = NULL;
    menuPtr->activeBorder = NULL;
    menuPtr->fontPtr = NULL;
    menuPtr->fg = NULL;
    menuPtr->textGC = None;
    menuPtr->disabledFg = NULL;
    menuPtr->gray = None;
    menuPtr->disabledGC = None;
    menuPtr->activeFg = NULL;
    menuPtr->activeGC = None;
    menuPtr->selectorFg = NULL;
    menuPtr->selectorGC = None;
    menuPtr->cursor = None;
    menuPtr->postedCascade = NULL;
    menuPtr->flags = 0;

    Tk_SetClass(new, "Menu");
    Tk_CreateEventHandler(menuPtr->tkwin, ExposureMask|StructureNotifyMask,
            MenuEventProc, (ClientData) menuPtr);
    Tcl_CreateCommand(interp, Tk_PathName(menuPtr->tkwin), MenuWidgetCmd,
            (ClientData) menuPtr, (void (*)()) NULL);
    if (ConfigureMenu(interp, menuPtr, argc-2, argv+2, 0) != TCL_OK) {
        goto error;
    }

    interp->result = Tk_PathName(menuPtr->tkwin);
    return TCL_OK;

    error:
    Tk_DestroyWindow(menuPtr->tkwin);
    return TCL_ERROR;
}
\f
/*
 *--------------------------------------------------------------
 *
 * MenuWidgetCmd --
 *
 *      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
MenuWidgetCmd(clientData, interp, argc, argv)
    ClientData clientData;      /* Information about menu widget. */
    Tcl_Interp *interp;         /* Current interpreter. */
    int argc;                   /* Number of arguments. */
    char **argv;                /* Argument strings. */
{
    register Menu *menuPtr = (Menu *) clientData;
    register MenuEntry *mePtr;
    int result = TCL_OK;
    int length, type;
    char c;

    if (argc < 2) {
        Tcl_AppendResult(interp, "wrong # args: should be \"",
                argv[0], " option ?arg arg ...?\"", (char *) NULL);
        return TCL_ERROR;
    }
    Tk_Preserve((ClientData) menuPtr);
    c = argv[1][0];
    length = strlen(argv[1]);
    if ((c == 'a') && (strncmp(argv[1], "activate", length) == 0)
            && (length >= 2)) {
        int index;

        if (argc != 3) {
            Tcl_AppendResult(interp, "wrong # args: should be \"",
                    argv[0], " activate index\"", (char *) NULL);
            goto error;
        }
        if (GetMenuIndex(interp, menuPtr, argv[2], &index) != TCL_OK) {
            goto error;
        }
        if (menuPtr->active == index) {
            goto done;
        }
        if (index >= 0) {
            if ((menuPtr->entries[index]->type == SEPARATOR_ENTRY)
                    || (menuPtr->entries[index]->state == tkDisabledUid)) {
                index = -1;
            }
        }
        result = ActivateMenuEntry(menuPtr, index);
    } else if ((c == 'a') && (strncmp(argv[1], "add", length) == 0)
            && (length >= 2)) {
        MenuEntry **newEntries;

        if (argc < 3) {
            Tcl_AppendResult(interp, "wrong # args: should be \"",
                    argv[0], " add type ?options?\"", (char *) NULL);
            goto error;
        }

        /*
         * Figure out the type of the new entry.
         */

        c = argv[2][0];
        length = strlen(argv[2]);
        if ((c == 'c') && (strncmp(argv[2], "cascade", length) == 0)
                && (length >= 2)) {
            type = CASCADE_ENTRY;
        } else if ((c == 'c') && (strncmp(argv[2], "checkbutton", length) == 0)
                && (length >= 2)) {
            type = CHECK_BUTTON_ENTRY;
        } else if ((c == 'c') && (strncmp(argv[2], "command", length) == 0)
                && (length >= 2)) {
            type = COMMAND_ENTRY;
        } else if ((c == 'r')
                && (strncmp(argv[2], "radiobutton", length) == 0)) {
            type = RADIO_BUTTON_ENTRY;
        } else if ((c == 's')
                && (strncmp(argv[2], "separator", length) == 0)) {
            type = SEPARATOR_ENTRY;
        } else {
            Tcl_AppendResult(interp, "bad menu entry type \"",
                    argv[2], "\":  must be cascade, checkbutton, ",
                    "command, radiobutton, or separator", (char *) NULL);
            goto error;
        }

        /*
         * Add a new entry to the end of the menu's array of entries,
         * and process options for it.
         */

        mePtr = (MenuEntry *) ckalloc(sizeof(MenuEntry));
        newEntries = (MenuEntry **) ckalloc((unsigned)
                ((menuPtr->numEntries+1)*sizeof(MenuEntry *)));
        if (menuPtr->numEntries != 0) {
            memcpy((VOID *) newEntries, (VOID *) menuPtr->entries,
                    menuPtr->numEntries*sizeof(MenuEntry *));
            ckfree((char *) menuPtr->entries);
        }
        menuPtr->entries = newEntries;
        menuPtr->entries[menuPtr->numEntries] = mePtr;
        menuPtr->numEntries++;
        mePtr->type = type;
        mePtr->menuPtr = menuPtr;
        mePtr->label = NULL;
        mePtr->underline = -1;
        mePtr->bitmap = None;
        mePtr->accel = NULL;
        mePtr->state = tkNormalUid;
        mePtr->border = NULL;
        mePtr->activeBorder = NULL;
        mePtr->fontPtr = NULL;
        mePtr->textGC = None;
        mePtr->activeGC = None;
        mePtr->disabledGC = None;
        mePtr->command = NULL;
        mePtr->name = NULL;
        mePtr->onValue = NULL;
        mePtr->offValue = NULL;
        mePtr->flags = 0;
        if (ConfigureMenuEntry(interp, menuPtr, mePtr, menuPtr->numEntries-1,
                argc-3, argv+3, 0) != TCL_OK) {
            DestroyMenuEntry((ClientData) mePtr);
            menuPtr->numEntries--;
            goto error;
        }
    } else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)) {
        if (argc == 2) {
            result = Tk_ConfigureInfo(interp, menuPtr->tkwin, configSpecs,
                    (char *) menuPtr, (char *) NULL, 0);
        } else if (argc == 3) {
            result = Tk_ConfigureInfo(interp, menuPtr->tkwin, configSpecs,
                    (char *) menuPtr, argv[2], 0);
        } else {
            result = ConfigureMenu(interp, menuPtr, argc-2, argv+2,
                    TK_CONFIG_ARGV_ONLY);
        }
    } else if ((c == 'd') && (strncmp(argv[1], "delete", length) == 0)
            && (length >= 2)) {
        int index, i;

        if (argc != 3) {
            Tcl_AppendResult(interp, "wrong # args: should be \"",
                    argv[0], " delete index\"", (char *) NULL);
            goto error;
        }
        if (GetMenuIndex(interp, menuPtr, argv[2], &index) != TCL_OK) {
            goto error;
        }
        if (index < 0) {
            goto done;
        }
        Tk_EventuallyFree((ClientData) menuPtr->entries[index],
                DestroyMenuEntry);
        for (i = index; i < menuPtr->numEntries-1; i++) {
            menuPtr->entries[i] = menuPtr->entries[i+1];
        }
        menuPtr->numEntries -= 1;
        if (menuPtr->active == index) {
            menuPtr->active = -1;
        } else if (menuPtr->active > index) {
            menuPtr->active -= 1;
        }
        if (!(menuPtr->flags & RESIZE_PENDING)) {
            menuPtr->flags |= RESIZE_PENDING;
            Tk_DoWhenIdle(ComputeMenuGeometry, (ClientData) menuPtr);
        }
    } else if ((c == 'd') && (strncmp(argv[1], "disable", length) == 0)
            && (length >= 2)) {
        int index;

        if (argc != 3) {
            Tcl_AppendResult(interp, "wrong # args: should be \"",
                    argv[0], " disable index\"", (char *) NULL);
            goto error;
        }
        if (GetMenuIndex(interp, menuPtr, argv[2], &index) != TCL_OK) {
            goto error;
        }
        if (index < 0) {
            goto done;
        }
        menuPtr->entries[index]->state = tkDisabledUid;
        if (menuPtr->active == index) {
            menuPtr->active = -1;
        }
        EventuallyRedrawMenu(menuPtr, index);
    } else if ((c == 'e') && (length >= 3)
            && (strncmp(argv[1], "enable", length) == 0)) {
        int index;

        if (argc != 3) {
            Tcl_AppendResult(interp, "wrong # args: should be \"",
                    argv[0], " enable index\"", (char *) NULL);
            goto error;
        }
        if (GetMenuIndex(interp, menuPtr, argv[2], &index) != TCL_OK) {
            goto error;
        }
        if (index < 0) {
            goto done;
        }
        menuPtr->entries[index]->state = tkNormalUid;
        EventuallyRedrawMenu(menuPtr, index);
    } else if ((c == 'e') && (length >= 3)
            && (strncmp(argv[1], "entryconfigure", length) == 0)) {
        int index;

        if (argc < 3) {
            Tcl_AppendResult(interp, "wrong # args: should be \"",
                    argv[0], " entryconfigure index ?option value ...?\"",
                    (char *) NULL);
            goto error;
        }
        if (GetMenuIndex(interp, menuPtr, argv[2], &index) != TCL_OK) {
            goto error;
        }
        if (index < 0) {
            goto done;
        }
        mePtr = menuPtr->entries[index];
        Tk_Preserve((ClientData) mePtr);
        if (argc == 3) {
            result = Tk_ConfigureInfo(interp, menuPtr->tkwin, entryConfigSpecs,
                    (char *) mePtr, (char *) NULL,
                    COMMAND_MASK << mePtr->type);
        } else if (argc == 4) {
            result = Tk_ConfigureInfo(interp, menuPtr->tkwin, entryConfigSpecs,
                    (char *) mePtr, argv[3], COMMAND_MASK << mePtr->type);
        } else {
            result = ConfigureMenuEntry(interp, menuPtr, mePtr, index, argc-3,
                    argv+3, TK_CONFIG_ARGV_ONLY | COMMAND_MASK << mePtr->type);
        }
        Tk_Release((ClientData) mePtr);
    } else if ((c == 'i') && (strncmp(argv[1], "index", length) == 0)
            && (length >= 3)) {
        int index;

        if (argc != 3) {
            Tcl_AppendResult(interp, "wrong # args: should be \"",
                    argv[0], " index string\"", (char *) NULL);
            goto error;
        }
        if (GetMenuIndex(interp, menuPtr, argv[2], &index) != TCL_OK) {
            goto error;
        }
        if (index < 0) {
            interp->result = "none";
        } else {
            sprintf(interp->result, "%d", index);
        }
    } else if ((c == 'i') && (strncmp(argv[1], "invoke", length) == 0)
            && (length >= 3)) {
        int index;

        if (argc != 3) {
            Tcl_AppendResult(interp, "wrong # args: should be \"",
                    argv[0], " invoke index\"", (char *) NULL);
            goto error;
        }
        if (GetMenuIndex(interp, menuPtr, argv[2], &index) != TCL_OK) {
            goto error;
        }
        if (index < 0) {
            goto done;
        }
        mePtr = menuPtr->entries[index];
        if (mePtr->state == tkDisabledUid) {
            goto done;
        }
        Tk_Preserve((ClientData) mePtr);
        if (mePtr->type == CHECK_BUTTON_ENTRY) {
            if (mePtr->flags & ENTRY_SELECTED) {
                Tcl_SetVar(interp, mePtr->name, mePtr->offValue,
                        TCL_GLOBAL_ONLY);
            } else {
                Tcl_SetVar(interp, mePtr->name, mePtr->onValue,
                        TCL_GLOBAL_ONLY);
            }
        } else if (mePtr->type == RADIO_BUTTON_ENTRY) {
            Tcl_SetVar(interp, mePtr->name, mePtr->onValue, TCL_GLOBAL_ONLY);
        }
        if (mePtr->command != NULL) {
            result = Tcl_GlobalEval(interp, mePtr->command);
        }
        Tk_Release((ClientData) mePtr);
    } else if ((c == 'p') && (strncmp(argv[1], "post", length) == 0)) {
        int x, y, tmp;
        Tk_Uid group;

        if ((argc != 4) && (argc != 5)) {
            Tcl_AppendResult(interp, "wrong # args: should be \"",
                    argv[0], " post x y ?group?\"", (char *) NULL);
            goto error;
        }
        if ((Tcl_GetInt(interp, argv[2], &x) != TCL_OK)
                || (Tcl_GetInt(interp, argv[3], &y) != TCL_OK)) {
            goto error;
        }
        if (argc == 5) {
            group = Tk_GetUid(argv[4]);
        } else {
            group = Tk_GetUid("default");
        }

        /*
         * Adjust the position of the menu if necessary to keep it
         * on-screen.
         */

        tmp = WidthOfScreen(Tk_Screen(menuPtr->tkwin))
                - Tk_Width(menuPtr->tkwin);
        if (x > tmp) {
            x = tmp;
        }
        if (x < 0) {
            x = 0;
        }
        tmp = HeightOfScreen(Tk_Screen(menuPtr->tkwin))
                - Tk_Height(menuPtr->tkwin);
        if (y > tmp) {
            y = tmp;
        }
        if (y < 0) {
            y = 0;
        }
        if ((x != Tk_X(menuPtr->tkwin)) || (y != Tk_Y(menuPtr->tkwin))) {
            Tk_MoveWindow(menuPtr->tkwin, x, y);
        }
        if (Tk_IsMapped(menuPtr->tkwin)) {
            if (group != menuPtr->group) {
                Tk_UnshareEvents(menuPtr->tkwin, menuPtr->group);
                Tk_ShareEvents(menuPtr->tkwin, group);
            }
        } else {
            Tk_ShareEvents(menuPtr->tkwin, group);
            Tk_MapWindow(menuPtr->tkwin);
            result = ActivateMenuEntry(menuPtr, -1);
        }
        XRaiseWindow(Tk_Display(menuPtr->tkwin), Tk_WindowId(menuPtr->tkwin));
        menuPtr->group = group;
    } else if ((c == 'u') && (strncmp(argv[1], "unpost", length) == 0)) {
        if (argc != 2) {
            Tcl_AppendResult(interp, "wrong # args: should be \"",
                    argv[0], " unpost\"", (char *) NULL);
            goto error;
        }
        Tk_UnshareEvents(menuPtr->tkwin, menuPtr->group);
        Tk_UnmapWindow(menuPtr->tkwin);
        result = ActivateMenuEntry(menuPtr, -1);
        if (result == TCL_OK) {
            result = PostSubmenu(interp, menuPtr, (MenuEntry *) NULL);
        }
    } else {
        Tcl_AppendResult(interp, "bad option \"", argv[1],
                "\": must be activate, add, configure, delete, disable, ",
                "enable, entryconfigure, index, invoke, post, ",
                "or unpost", (char *) NULL);
        goto error;
    }
    done:
    Tk_Release((ClientData) menuPtr);
    return result;

    error:
    Tk_Release((ClientData) menuPtr);
    return TCL_ERROR;
}
\f
/*
 *----------------------------------------------------------------------
 *
 * DestroyMenu --
 *
 *      This procedure is invoked by Tk_EventuallyFree or Tk_Release
 *      to clean up the internal structure of a menu at a safe time
 *      (when no-one is using it anymore).
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Everything associated with the menu is freed up.
 *
 *----------------------------------------------------------------------
 */

static void
DestroyMenu(clientData)
    ClientData clientData;      /* Info about menu widget. */
{
    register Menu *menuPtr = (Menu *) clientData;
    int i;

    for (i = 0; i < menuPtr->numEntries; i++) {
        DestroyMenuEntry((ClientData) menuPtr->entries[i]);
    }
    if (menuPtr->entries != NULL) {
        ckfree((char *) menuPtr->entries);
    }
    if (menuPtr->border != NULL) {
        Tk_Free3DBorder(menuPtr->border);
    }
    if (menuPtr->activeBorder != NULL) {
        Tk_Free3DBorder(menuPtr->activeBorder);
    }
    if (menuPtr->fontPtr != NULL) {
        Tk_FreeFontStruct(menuPtr->fontPtr);
    }
    if (menuPtr->fg != NULL) {
        Tk_FreeColor(menuPtr->fg);
    }
    if (menuPtr->textGC != None) {
        Tk_FreeGC(menuPtr->textGC);
    }
    if (menuPtr->disabledFg != NULL) {
        Tk_FreeColor(menuPtr->disabledFg);
    }
    if (menuPtr->gray != None) {
        Tk_FreeBitmap(menuPtr->gray);
    }
    if (menuPtr->disabledGC != None) {
        Tk_FreeGC(menuPtr->disabledGC);
    }
    if (menuPtr->activeFg != NULL) {
        Tk_FreeColor(menuPtr->activeFg);
    }
    if (menuPtr->activeGC != None) {
        Tk_FreeGC(menuPtr->activeGC);
    }
    if (menuPtr->selectorFg != NULL) {
        Tk_FreeColor(menuPtr->selectorFg);
    }
    if (menuPtr->selectorGC != None) {
        Tk_FreeGC(menuPtr->selectorGC);
    }
    if (menuPtr->cursor != None) {
        Tk_FreeCursor(menuPtr->cursor);
    }
    ckfree((char *) menuPtr);
}
\f
/*
 *----------------------------------------------------------------------
 *
 * DestroyMenuEntry --
 *
 *      This procedure is invoked by Tk_EventuallyFree or Tk_Release
 *      to clean up the internal structure of a menu entry at a safe time
 *      (when no-one is using it anymore).
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Everything associated with the menu entry is freed up.
 *
 *----------------------------------------------------------------------
 */

static void
DestroyMenuEntry(clientData)
    ClientData clientData;              /* Pointer to entry to be freed. */
{
    register MenuEntry *mePtr = (MenuEntry *) clientData;
    Menu *menuPtr = mePtr->menuPtr;

    if (mePtr->name != NULL) {
        Tcl_UntraceVar(menuPtr->interp, mePtr->name,
                TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                MenuVarProc, (ClientData) mePtr);
    }
    if (menuPtr->postedCascade == mePtr) {
        if (PostSubmenu(menuPtr->interp, menuPtr, (MenuEntry *) NULL)
                != TCL_OK) {
            TkBindError(menuPtr->interp);
        }
    }
    if (mePtr->label != NULL) {
        ckfree(mePtr->label);
    }
    if (mePtr->bitmap != None) {
#if defined(USE_XPM3)
        Tk_FreePixmap(mePtr->bitmap);
#else
        Tk_FreeBitmap(mePtr->bitmap);
#endif
    }
    if (mePtr->accel != NULL) {
        ckfree(mePtr->accel);
    }
    if (mePtr->border != NULL) {
        Tk_Free3DBorder(mePtr->border);
    }
    if (mePtr->activeBorder != NULL) {
        Tk_Free3DBorder(mePtr->activeBorder);
    }
    if (mePtr->fontPtr != NULL) {
        Tk_FreeFontStruct(mePtr->fontPtr);
    }
    if (mePtr->textGC != NULL) {
        Tk_FreeGC(mePtr->textGC);
    }
    if (mePtr->activeGC != NULL) {
        Tk_FreeGC(mePtr->activeGC);
    }
    if (mePtr->disabledGC != NULL) {
        Tk_FreeGC(mePtr->disabledGC);
    }
    if (mePtr->command != NULL) {
        ckfree(mePtr->command);
    }
    if (mePtr->name != NULL) {
        ckfree(mePtr->name);
    }
    if (mePtr->onValue != NULL) {
        ckfree(mePtr->onValue);
    }
    if (mePtr->offValue != NULL) {
        ckfree(mePtr->offValue);
    }
    ckfree((char *) mePtr);
}
\f
/*
 *----------------------------------------------------------------------
 *
 * ConfigureMenu --
 *
 *      This procedure is called to process an argv/argc list, plus
 *      the Tk option database, in order to configure (or
 *      reconfigure) a menu 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 colors, font, etc. get set
 *      for menuPtr;  old resources get freed, if there were any.
 *
 *----------------------------------------------------------------------
 */

static int
ConfigureMenu(interp, menuPtr, argc, argv, flags)
    Tcl_Interp *interp;         /* Used for error reporting. */
    register Menu *menuPtr;     /* 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. */
{
    XGCValues gcValues;
    GC newGC;
    unsigned long mask;
    int i;

    if (Tk_ConfigureWidget(interp, menuPtr->tkwin, configSpecs,
            argc, argv, (char *) menuPtr, 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.
     */

    Tk_SetBackgroundFromBorder(menuPtr->tkwin, menuPtr->border);

    gcValues.font = menuPtr->fontPtr->fid;
    gcValues.foreground = menuPtr->fg->pixel;
    gcValues.background = Tk_3DBorderColor(menuPtr->border)->pixel;
    newGC = Tk_GetGC(menuPtr->tkwin, GCForeground|GCBackground|GCFont,
            &gcValues);
    if (menuPtr->textGC != None) {
        Tk_FreeGC(menuPtr->textGC);
    }
    menuPtr->textGC = newGC;

    if (menuPtr->disabledFg != NULL) {
        gcValues.foreground = menuPtr->disabledFg->pixel;
        mask = GCForeground|GCBackground|GCFont;
    } else {
        gcValues.foreground = gcValues.background;
        if (menuPtr->gray == None) {
            menuPtr->gray = Tk_GetBitmap(interp, menuPtr->tkwin,
                    Tk_GetUid("gray50"));
            if (menuPtr->gray == None) {
                return TCL_ERROR;
            }
        }
        gcValues.fill_style = FillStippled;
        gcValues.stipple = menuPtr->gray;
        mask = GCForeground|GCFillStyle|GCStipple;
    }
    newGC = Tk_GetGC(menuPtr->tkwin, mask, &gcValues);
    if (menuPtr->disabledGC != None) {
        Tk_FreeGC(menuPtr->disabledGC);
    }
    menuPtr->disabledGC = newGC;

    gcValues.font = menuPtr->fontPtr->fid;
    gcValues.foreground = menuPtr->activeFg->pixel;
    gcValues.background = Tk_3DBorderColor(menuPtr->activeBorder)->pixel;
    newGC = Tk_GetGC(menuPtr->tkwin, GCForeground|GCBackground|GCFont,
            &gcValues);
    if (menuPtr->activeGC != None) {
        Tk_FreeGC(menuPtr->activeGC);
    }
    menuPtr->activeGC = newGC;

    gcValues.foreground = menuPtr->selectorFg->pixel;
    newGC = Tk_GetGC(menuPtr->tkwin, GCForeground|GCFont, &gcValues);
    if (menuPtr->selectorGC != None) {
        Tk_FreeGC(menuPtr->selectorGC);
    }
    menuPtr->selectorGC = newGC;

    /*
     * After reconfiguring a menu, we need to reconfigure all of the
     * entries in the menu, since some of the things in the children
     * (such as graphics contexts) may have to change to reflect changes
     * in the parent.
     */

    for (i = 0; i < menuPtr->numEntries; i++) {
        MenuEntry *mePtr;

        mePtr = menuPtr->entries[i];
        ConfigureMenuEntry(interp, menuPtr, mePtr, i, 0, (char **) NULL,
                TK_CONFIG_ARGV_ONLY | COMMAND_MASK << mePtr->type);
    }

    if (!(menuPtr->flags & RESIZE_PENDING)) {
        menuPtr->flags |= RESIZE_PENDING;
        Tk_DoWhenIdle(ComputeMenuGeometry, (ClientData) menuPtr);
    }

    return TCL_OK;
}
\f
/*
 *----------------------------------------------------------------------
 *
 * ConfigureMenuEntry --
 *
 *      This procedure is called to process an argv/argc list, plus
 *      the Tk option database, in order to configure (or
 *      reconfigure) one entry in a menu.
 *
 * 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 label and accelerator get
 *      set for mePtr;  old resources get freed, if there were any.
 *
 *----------------------------------------------------------------------
 */

static int
ConfigureMenuEntry(interp, menuPtr, mePtr, index, argc, argv, flags)
    Tcl_Interp *interp;                 /* Used for error reporting. */
    Menu *menuPtr;                      /* Information about whole menu. */
    register MenuEntry *mePtr;          /* Information about menu entry;  may
                                         * or may not already have values for
                                         * some fields. */
    int index;                          /* Index of mePtr within menuPtr's
                                         * entries. */
    int argc;                           /* Number of valid entries in argv. */
    char **argv;                        /* Arguments. */
    int flags;                          /* Additional flags to pass to
                                         * Tk_ConfigureWidget. */
{
    XGCValues gcValues;
    GC newGC, newActiveGC, newDisabledGC;
    unsigned long mask;

    /*
     * If this entry is a cascade and the cascade is posted, then unpost
     * it before reconfiguring the entry (otherwise the reconfigure might
     * change the name of the cascaded entry, leaving a posted menu
     * high and dry).
     */

    if (menuPtr->postedCascade == mePtr) {
        if (PostSubmenu(menuPtr->interp, menuPtr, (MenuEntry *) NULL)
                != TCL_OK) {
            TkBindError(menuPtr->interp);
        }
    }

    /*
     * If this entry is a check button or radio button, then remove
     * its old trace procedure.
     */

    if ((mePtr->name != NULL) &&
            ((mePtr->type == CHECK_BUTTON_ENTRY)
            || (mePtr->type == RADIO_BUTTON_ENTRY))) {
        Tcl_UntraceVar(menuPtr->interp, mePtr->name,
                TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                MenuVarProc, (ClientData) mePtr);
    }

    if (Tk_ConfigureWidget(interp, menuPtr->tkwin, entryConfigSpecs,
            argc, argv, (char *) mePtr,
            flags | (COMMAND_MASK << mePtr->type)) != TCL_OK) {
        return TCL_ERROR;
    }

    /*
     * The code below handles special configuration stuff not taken
     * care of by Tk_ConfigureWidget, such as special processing for
     * defaults, sizing strings, graphics contexts, etc.
     */

    if (mePtr->label == NULL) {
        mePtr->labelLength = 0;
    } else {
        mePtr->labelLength = strlen(mePtr->label);
    }
    if (mePtr->accel == NULL) {
        mePtr->accelLength = 0;
    } else {
        mePtr->accelLength = strlen(mePtr->accel);
    }

    if (mePtr->state == tkActiveUid) {
        if (index != menuPtr->active) {
            ActivateMenuEntry(menuPtr, index);
        }
    } else {
        if (index == menuPtr->active) {
            ActivateMenuEntry(menuPtr, -1);
        }
        if ((mePtr->state != tkNormalUid) && (mePtr->state != tkDisabledUid)) {
            Tcl_AppendResult(interp, "bad state value \"", mePtr->state,
                    "\":  must be normal, active, or disabled", (char *) NULL);
            mePtr->state = tkNormalUid;
            return TCL_ERROR;
        }
    }

    if (mePtr->fontPtr != NULL) {
        gcValues.foreground = menuPtr->fg->pixel;
        gcValues.background = Tk_3DBorderColor(
                (mePtr->border != NULL) ? mePtr->border : menuPtr->border)
                ->pixel;
        gcValues.font = mePtr->fontPtr->fid;

        /*
         * Note: disable GraphicsExpose events;  we know there won't be
         * obscured areas when copying from an off-screen pixmap to the
         * screen and this gets rid of unnecessary events.
         */

        gcValues.graphics_exposures = False;
        newGC = Tk_GetGC(menuPtr->tkwin,
                GCForeground|GCBackground|GCFont|GCGraphicsExposures,
                &gcValues);

        if (menuPtr->disabledFg != NULL) {
            gcValues.foreground = menuPtr->disabledFg->pixel;
            mask = GCForeground|GCBackground|GCFont|GCGraphicsExposures;
        } else {
            gcValues.foreground = gcValues.background;
            gcValues.fill_style = FillStippled;
            gcValues.stipple = menuPtr->gray;
            mask = GCForeground|GCFillStyle|GCStipple;
        }
        newDisabledGC = Tk_GetGC(menuPtr->tkwin, mask, &gcValues);

        gcValues.foreground = menuPtr->activeFg->pixel;
        gcValues.background = Tk_3DBorderColor(
                (mePtr->activeBorder != NULL) ? mePtr->activeBorder
                : menuPtr->activeBorder)->pixel;
        newActiveGC = Tk_GetGC(menuPtr->tkwin,
                GCForeground|GCBackground|GCFont|GCGraphicsExposures,
                &gcValues);
    } else {
        newGC = NULL;
        newActiveGC = NULL;
        newDisabledGC = NULL;
    }
    if (mePtr->textGC != NULL) {
            Tk_FreeGC(mePtr->textGC);
    }
    mePtr->textGC = newGC;
    if (mePtr->activeGC != NULL) {
            Tk_FreeGC(mePtr->activeGC);
    }
    mePtr->activeGC = newActiveGC;
    if (mePtr->disabledGC != NULL) {
            Tk_FreeGC(mePtr->disabledGC);
    }
    mePtr->disabledGC = newDisabledGC;

    if ((mePtr->type == CHECK_BUTTON_ENTRY)
            || (mePtr->type == RADIO_BUTTON_ENTRY)) {
        char *value;

        if (mePtr->name == NULL) {
            mePtr->name = ckalloc((unsigned) (strlen(mePtr->label) + 1));
            strcpy(mePtr->name, mePtr->label);
        }
        if (mePtr->onValue == NULL) {
            mePtr->onValue = ckalloc((unsigned) (strlen(mePtr->label) + 1));
            strcpy(mePtr->onValue, mePtr->label);
        }

        /*
         * Select the entry 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, mePtr->name, TCL_GLOBAL_ONLY);
        mePtr->flags &= ENTRY_SELECTED;
        if (value != NULL) {
            if (strcmp(value, mePtr->onValue) == 0) {
                mePtr->flags |= ENTRY_SELECTED;
            }
        } else {
            Tcl_SetVar(interp, mePtr->name,
                    (mePtr->type == CHECK_BUTTON_ENTRY) ? mePtr->offValue : "",
                    TCL_GLOBAL_ONLY);
        }
        Tcl_TraceVar(interp, mePtr->name,
                TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                MenuVarProc, (ClientData) mePtr);
    }

    if (!(menuPtr->flags & RESIZE_PENDING)) {
        menuPtr->flags |= RESIZE_PENDING;
        Tk_DoWhenIdle(ComputeMenuGeometry, (ClientData) menuPtr);
    }
    return TCL_OK;
}
\f
/*
 *--------------------------------------------------------------
 *
 * ComputeMenuGeometry --
 *
 *      This procedure is invoked to recompute the size and
 *      layout of a menu.  It is called as a when-idle handler so
 *      that it only gets done once, even if a group of changes is
 *      made to the menu.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Fields of menu entries are changed to reflect their
 *      current positions, and the size of the menu window
 *      itself may be changed.
 *
 *--------------------------------------------------------------
 */

static void
ComputeMenuGeometry(clientData)
    ClientData clientData;              /* Structure describing menu. */
{
    Menu *menuPtr = (Menu *) clientData;
    register MenuEntry *mePtr;
    XFontStruct *fontPtr;
    int maxLabelWidth, maxSelectorWidth, maxAccelWidth;
    int width, height, selectorSpace, horizMargin;
    int i, y;

    if (menuPtr->tkwin == NULL) {
        return;
    }

    maxLabelWidth = maxSelectorWidth = maxAccelWidth = 0;
    y = menuPtr->borderWidth;

    for (i = 0; i < menuPtr->numEntries; i++) {
        mePtr = menuPtr->entries[i];
        selectorSpace = 0;
        fontPtr = mePtr->fontPtr;
        if (fontPtr == NULL) {
            fontPtr = menuPtr->fontPtr;
        }

        /*
         * For each entry, compute the height required by that
         * particular entry, plus three widths:  the width of the
         * label, the width to allow for a selector to be displayed
         * to the left of the label (if any), and the width of the
         * accelerator to be displayed to the right of the label
         * (if any).  These sizes depend, of course, on the type
         * of the entry.
         */

        if (mePtr->bitmap != None) {
            unsigned int bitmapWidth, bitmapHeight;

#if defined(USE_XPM3)
            Tk_SizeOfPixmap(mePtr->bitmap, &bitmapWidth, &bitmapHeight);
#else
            Tk_SizeOfBitmap(mePtr->bitmap, &bitmapWidth, &bitmapHeight);
#endif
            mePtr->height = bitmapHeight;
            width = bitmapWidth;
            if (mePtr->type == CHECK_BUTTON_ENTRY) {
                selectorSpace = (14*mePtr->height)/10;
                mePtr->selectorDiameter = (65*mePtr->height)/100;
            } else if (mePtr->type == RADIO_BUTTON_ENTRY) {
                selectorSpace = (14*mePtr->height)/10;
                mePtr->selectorDiameter = (75*mePtr->height)/100;
            }
        } else {
            mePtr->height = fontPtr->ascent + fontPtr->descent;
            if (mePtr->label != NULL) {
                (void) TkMeasureChars(fontPtr, mePtr->label,
                        mePtr->labelLength, 0, (int) 100000,
                        TK_NEWLINES_NOT_SPECIAL, &width);
            } else {
                width = 0;
            }
            if (mePtr->type == CHECK_BUTTON_ENTRY) {
                selectorSpace = mePtr->height;
                mePtr->selectorDiameter = (80*mePtr->height)/100;
            } else if (mePtr->type == RADIO_BUTTON_ENTRY) {
                selectorSpace = mePtr->height;
                mePtr->selectorDiameter = mePtr->height;
            }
        }
        mePtr->height += 2*menuPtr->activeBorderWidth + 2;
        if (width > maxLabelWidth) {
            maxLabelWidth = width;
        }
        if (mePtr->accel != NULL) {
            (void) TkMeasureChars(fontPtr, mePtr->accel, mePtr->accelLength,
                    0, (int) 100000, TK_NEWLINES_NOT_SPECIAL, &width);
            if (width > maxAccelWidth) {
                maxAccelWidth = width;
            }
        }
        if (mePtr->type == SEPARATOR_ENTRY) {
            mePtr->height = 4*menuPtr->borderWidth;
        }
        if (selectorSpace > maxSelectorWidth) {
            maxSelectorWidth = selectorSpace;
        }
        mePtr->y = y;
        y += mePtr->height;
    }

    /*
     * Got all the sizes.  Update fields in the menu structure, then
     * resize the window if necessary.  Leave margins on either side
     * of the selector (or just one margin if there is no selector).
     * Leave another margin on the right side of the label, plus yet
     * another margin to the right of the accelerator (if there is one).
     */

    horizMargin = 2;
    menuPtr->selectorSpace = maxSelectorWidth + horizMargin;
    if (maxSelectorWidth != 0) {
        menuPtr->selectorSpace += horizMargin;
    }
    menuPtr->labelWidth = maxLabelWidth + horizMargin;
    width = menuPtr->selectorSpace + menuPtr->labelWidth + maxAccelWidth
            + 2*menuPtr->borderWidth + 2*menuPtr->activeBorderWidth + 2;
    if (maxAccelWidth != 0) {
        width += horizMargin;
    }
    height = y + menuPtr->borderWidth;

    /*
     * The X server doesn't like zero dimensions, so round up to at least
     * 1 (a zero-sized menu should never really occur, anyway).
     */

    if (width <= 0) {
        width = 1;
    }
    if (height <= 0) {
        height = 1;
    }
    if ((width != Tk_ReqWidth(menuPtr->tkwin)) ||
            (height != Tk_ReqHeight(menuPtr->tkwin))) {
        Tk_GeometryRequest(menuPtr->tkwin, width, height);
    } else {
        /*
         * Must always force a redisplay here if the window is mapped
         * (even if the size didn't change, something else might have
         * changed in the menu, such as a label or accelerator).  The
         * resize will force a redisplay above.
         */

        EventuallyRedrawMenu(menuPtr, -1);
    }

    menuPtr->flags &= ~RESIZE_PENDING;
}
\f
/*
 *----------------------------------------------------------------------
 *
 * DisplayMenu --
 *
 *      This procedure is invoked to display a menu widget.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Commands are output to X to display the menu in its
 *      current mode.
 *
 *----------------------------------------------------------------------
 */

static void
DisplayMenu(clientData)
    ClientData clientData;      /* Information about widget. */
{
    register Menu *menuPtr = (Menu *) clientData;
    register MenuEntry *mePtr;
    register Tk_Window tkwin = menuPtr->tkwin;
    XFontStruct *fontPtr;
    int index, baseline;
    GC gc;

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

    /*
     * Loop through all of the entries, drawing them one at a time.
     */

    for (index = 0; index < menuPtr->numEntries; index++) {
        mePtr = menuPtr->entries[index];
        if (!(mePtr->flags & ENTRY_NEEDS_REDISPLAY)) {
            continue;
        }
        mePtr->flags &= ~ENTRY_NEEDS_REDISPLAY;

        /*
         * Background.
         */

        if (mePtr->state == tkActiveUid) {
            Tk_Fill3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin),
                    (mePtr->activeBorder != NULL) ? mePtr->activeBorder
                    : menuPtr->activeBorder, menuPtr->borderWidth, mePtr->y,
                    Tk_Width(tkwin) - 2*menuPtr->borderWidth, mePtr->height,
                    menuPtr->activeBorderWidth, TK_RELIEF_RAISED);
            gc = mePtr->activeGC;
            if (gc == NULL) {
                gc = menuPtr->activeGC;
            }
        } else {
            Tk_Fill3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin),
                    (mePtr->border != NULL) ? mePtr->border
                    : menuPtr->border, menuPtr->borderWidth, mePtr->y,
                    Tk_Width(tkwin) - 2*menuPtr->borderWidth, mePtr->height,
                    0, TK_RELIEF_FLAT);
            if ((mePtr->state == tkDisabledUid)
                    && (menuPtr->disabledFg != NULL)) {
                gc = mePtr->disabledGC;
                if (gc == NULL) {
                    gc = menuPtr->disabledGC;
                }
            } else {
                gc = mePtr->textGC;
                if (gc == NULL) {
                    gc = menuPtr->textGC;
                }
            }
        }

        /*
         * Draw label or bitmap for entry.
         */

        fontPtr = mePtr->fontPtr;
        if (fontPtr == NULL) {
            fontPtr = menuPtr->fontPtr;
        }
        baseline = mePtr->y + (mePtr->height + fontPtr->ascent
                - fontPtr->descent)/2;
        if (mePtr->bitmap != None) {
            unsigned int width, height;

#if defined(USE_XPM3)        
            Tk_SizeOfPixmap(mePtr->bitmap, &width, &height);
            XCopyArea(Tk_Display(tkwin), mePtr->bitmap, Tk_WindowId(tkwin),
                   gc, 0, 0, width, height,
                   menuPtr->borderWidth + menuPtr->selectorSpace,
                   (int) (mePtr->y + (mePtr->height - height)/2));
#else
            Tk_SizeOfBitmap(mePtr->bitmap, &width, &height);
            XCopyPlane(Tk_Display(tkwin), mePtr->bitmap, Tk_WindowId(tkwin),
                    gc, 0, 0, width, height,
                    menuPtr->borderWidth + menuPtr->selectorSpace,
                    (int) (mePtr->y + (mePtr->height - height)/2), 1);
#endif
        } else {
            baseline = mePtr->y + (mePtr->height + fontPtr->ascent
                    - fontPtr->descent)/2;
            if (mePtr->label != NULL) {
                TkDisplayChars(Tk_Display(tkwin), Tk_WindowId(tkwin), gc,
                        fontPtr, mePtr->label, mePtr->labelLength,
                        menuPtr->borderWidth + menuPtr->selectorSpace,
                        baseline, TK_NEWLINES_NOT_SPECIAL);
                if (mePtr->underline >= 0) {
                    TkUnderlineChars(Tk_Display(tkwin), Tk_WindowId(tkwin), gc,
                            fontPtr, mePtr->label,
                            menuPtr->borderWidth + menuPtr->selectorSpace,
                            baseline, TK_NEWLINES_NOT_SPECIAL,
                            mePtr->underline, mePtr->underline);
                }
            }
        }

        /*
         * Draw accelerator.
         */

        if (mePtr->accel != NULL) {
            TkDisplayChars(Tk_Display(tkwin), Tk_WindowId(tkwin), gc,
                    fontPtr, mePtr->accel, mePtr->accelLength,
                    menuPtr->borderWidth + menuPtr->selectorSpace
                    + menuPtr->labelWidth, baseline, TK_NEWLINES_NOT_SPECIAL);
        }

        /*
         * Draw check-button selector.
         */

        if (mePtr->type == CHECK_BUTTON_ENTRY) {
            int dim, x, y;

            dim = mePtr->selectorDiameter;
            x = menuPtr->borderWidth + (menuPtr->selectorSpace - dim)/2;
            y = mePtr->y + (mePtr->height - dim)/2;
            Tk_Fill3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin),
                    menuPtr->border, x, y, dim, dim,
                    menuPtr->activeBorderWidth, TK_RELIEF_SUNKEN);
            x += menuPtr->activeBorderWidth;
            y += menuPtr->activeBorderWidth;
            dim -= 2*menuPtr->activeBorderWidth;
            if ((dim > 0) && (mePtr->flags & ENTRY_SELECTED)) {
                XFillRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin),
                        menuPtr->selectorGC, x, y, (unsigned int) dim,
                        (unsigned int) dim);
            }
        }

        /*
         * Draw radio-button selector.
         */

        if (mePtr->type == RADIO_BUTTON_ENTRY) {
            XPoint points[4];
            int radius;

            radius = mePtr->selectorDiameter/2;
            points[0].x = menuPtr->borderWidth
                    + (menuPtr->selectorSpace - mePtr->selectorDiameter)/2;
            points[0].y = mePtr->y + (mePtr->height)/2;
            points[1].x = points[0].x + radius;
            points[1].y = points[0].y + radius;
            points[2].x = points[1].x + radius;
            points[2].y = points[0].y;
            points[3].x = points[1].x;
            points[3].y = points[0].y - radius;
            if (mePtr->flags & ENTRY_SELECTED) {
                XFillPolygon(Tk_Display(tkwin), Tk_WindowId(tkwin),
                        menuPtr->selectorGC, points, 4, Convex,
                        CoordModeOrigin);
            } else {
                Tk_Fill3DPolygon(Tk_Display(tkwin), Tk_WindowId(tkwin),
                        menuPtr->border, points, 4, menuPtr->activeBorderWidth,
                        TK_RELIEF_FLAT);
            }
            Tk_Draw3DPolygon(Tk_Display(tkwin), Tk_WindowId(tkwin),
                    menuPtr->border, points, 4, menuPtr->activeBorderWidth,
                    TK_RELIEF_SUNKEN);
        }

        /*
         * Draw separator.
         */

        if (mePtr->type == SEPARATOR_ENTRY) {
            XPoint points[2];
            int margin;

            margin = (fontPtr->ascent + fontPtr->descent)/2;
            points[0].x = 2*menuPtr->borderWidth + margin;
            points[0].y = mePtr->y + mePtr->height/2;
            points[1].x = Tk_Width(tkwin) - 2*menuPtr->borderWidth - margin;
            points[1].y = points[0].y;
            Tk_Draw3DPolygon(Tk_Display(tkwin), Tk_WindowId(tkwin),
                    menuPtr->border, points, 2, 1, TK_RELIEF_RAISED);
        }

        /*
         * If the entry is disabled with a stipple rather than a special
         * foreground color, generate the stippled effect.
         */

        if ((mePtr->state == tkDisabledUid) && (menuPtr->disabledFg == NULL)) {
            XFillRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin),
                    menuPtr->disabledGC, menuPtr->borderWidth,
                    mePtr->y,
                    (unsigned) (Tk_Width(tkwin) - 2*menuPtr->borderWidth),
                    (unsigned) mePtr->height);
        }
    }

    Tk_Draw3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin),
            menuPtr->border, 0, 0, Tk_Width(tkwin), Tk_Height(tkwin),
            menuPtr->borderWidth, TK_RELIEF_RAISED);
}
\f
/*
 *--------------------------------------------------------------
 *
 * GetMenuIndex --
 *
 *      Parse a textual index into a menu and return the numerical
 *      index of the indicated entry.
 *
 * Results:
 *      A standard Tcl result.  If all went well, then *indexPtr is
 *      filled in with the entry index corresponding to string
 *      (ranges from -1 to the number of entries in the menu minus
 *      one).  Otherwise an error message is left in interp->result.
 *
 * Side effects:
 *      None.
 *
 *--------------------------------------------------------------
 */

static int
GetMenuIndex(interp, menuPtr, string, indexPtr)
    Tcl_Interp *interp;         /* For error messages. */
    Menu *menuPtr;              /* Menu for which the index is being
                                 * specified. */
    char *string;               /* Specification of an entry in menu.  See
                                 * manual entry for valid .*/
    int *indexPtr;              /* Where to store converted relief. */
{
    int i, y;

    if ((string[0] == 'a') && (strcmp(string, "active") == 0)) {
        *indexPtr = menuPtr->active;
        return TCL_OK;
    }

    if ((string[0] == 'l') && (strcmp(string, "last") == 0)) {
        *indexPtr = menuPtr->numEntries-1;
        return TCL_OK;
    }

    if ((string[0] == 'n') && (strcmp(string, "none") == 0)) {
        *indexPtr = -1;
        return TCL_OK;
    }

    if (string[0] == '@') {
        if (Tcl_GetInt(interp, string+1,  &y) == TCL_OK) {
            if (y < 0) {
                *indexPtr = -1;
                return TCL_OK;
            }
            for (i = 0; i < menuPtr->numEntries; i++) {
                y -= menuPtr->entries[i]->height;
                if (y < 0) {
                    break;
                }
            }
            if (i >= menuPtr->numEntries) {
                i = -1;
            }
            *indexPtr = i;
            return TCL_OK;
        } else {
            Tcl_SetResult(interp, (char *) NULL, TCL_STATIC);
        }
    }

    if (isdigit(string[0])) {
        if (Tcl_GetInt(interp, string,  &i) == TCL_OK) {
            if ((i < menuPtr->numEntries) && (i >= 0)) {
                *indexPtr = i;
                return TCL_OK;
            }
        } else {
            Tcl_SetResult(interp, (char *) NULL, TCL_STATIC);
        }
    }

    for (i = 0; i < menuPtr->numEntries; i++) {
        char *label;

        label = menuPtr->entries[i]->label;
        if ((label != NULL)
                && (Tcl_StringMatch(menuPtr->entries[i]->label, string))) {
            *indexPtr = i;
            return TCL_OK;
        }
    }

    Tcl_AppendResult(interp, "bad menu entry index \"",
            string, "\"", (char *) NULL);
    return TCL_ERROR;
}
\f
/*
 *--------------------------------------------------------------
 *
 * MenuEventProc --
 *
 *      This procedure is invoked by the Tk dispatcher for various
 *      events on menus.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      When the window gets deleted, internal structures get
 *      cleaned up.  When it gets exposed, it is redisplayed.
 *
 *--------------------------------------------------------------
 */

static void
MenuEventProc(clientData, eventPtr)
    ClientData clientData;      /* Information about window. */
    XEvent *eventPtr;           /* Information about event. */
{
    Menu *menuPtr = (Menu *) clientData;
    if ((eventPtr->type == Expose) && (eventPtr->xexpose.count == 0)) {
        EventuallyRedrawMenu(menuPtr, -1);
    } else if (eventPtr->type == DestroyNotify) {
        Tcl_DeleteCommand(menuPtr->interp, Tk_PathName(menuPtr->tkwin));

        /*
         * Careful!  Must delete the event-sharing information here
         * rather than in DestroyMenu.  By the time that procedure
         * is called the tkwin may have been reused, resulting in some
         * other window accidentally being cut off from shared events.
         */

        Tk_UnshareEvents(menuPtr->tkwin, menuPtr->group);
        menuPtr->tkwin = NULL;
        if (menuPtr->flags & REDRAW_PENDING) {
            Tk_CancelIdleCall(DisplayMenu, (ClientData) menuPtr);
        }
        if (menuPtr->flags & RESIZE_PENDING) {
            Tk_CancelIdleCall(ComputeMenuGeometry, (ClientData) menuPtr);
        }
        Tk_EventuallyFree((ClientData) menuPtr, DestroyMenu);
    }
}
\f
/*
 *--------------------------------------------------------------
 *
 * MenuVarProc --
 *
 *      This procedure is invoked when someone changes the
 *      state variable associated with a radiobutton or checkbutton
 *      menu entry.  The entry's selected state is set to match
 *      the value of the variable.
 *
 * Results:
 *      NULL is always returned.
 *
 * Side effects:
 *      The menu entry may become selected or deselected.
 *
 *--------------------------------------------------------------
 */

        /* ARGSUSED */
static char *
MenuVarProc(clientData, interp, name1, name2, flags)
    ClientData clientData;      /* Information about menu entry. */
    Tcl_Interp *interp;         /* Interpreter containing variable. */
    char *name1;                /* First part of variable's name. */
    char *name2;                /* Second part of variable's name. */
    int flags;                  /* Describes what just happened. */
{
    MenuEntry *mePtr = (MenuEntry *) clientData;
    Menu *menuPtr;
    char *value;

    menuPtr = mePtr->menuPtr;

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

    if (flags & TCL_TRACE_UNSETS) {
        mePtr->flags &= ~ENTRY_SELECTED;
        if ((flags & TCL_TRACE_DESTROYED) && !(flags & TCL_INTERP_DESTROYED)) {
            Tcl_TraceVar2(interp, name1, name2,
                    TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                    MenuVarProc, clientData);
        }
        EventuallyRedrawMenu(menuPtr, -1);
        return (char *) NULL;
    }

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

    value = Tcl_GetVar2(interp, name1, name2, flags & TCL_GLOBAL_ONLY);
    if (strcmp(value, mePtr->onValue) == 0) {
        if (mePtr->flags & ENTRY_SELECTED) {
            return (char *) NULL;
        }
        mePtr->flags |= ENTRY_SELECTED;
    } else if (mePtr->flags & ENTRY_SELECTED) {
        mePtr->flags &= ~ENTRY_SELECTED;
    } else {
        return (char *) NULL;
    }
    EventuallyRedrawMenu(menuPtr, -1);
    return (char *) NULL;
}
\f
/*
 *----------------------------------------------------------------------
 *
 * EventuallyRedrawMenu --
 *
 *      Arrange for an entry of a menu, or the whole menu, to be
 *      redisplayed at some point in the future.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      A when-idle hander is scheduled to do the redisplay, if there
 *      isn't one already scheduled.
 *
 *----------------------------------------------------------------------
 */

static void
EventuallyRedrawMenu(menuPtr, index)
    register Menu *menuPtr;     /* Information about menu to redraw. */
    int index;                  /* Which entry to redraw.  If -1, then
                                 * all the entries in the menu are redrawn. */
{
    if (menuPtr->tkwin == NULL) {
        return;
    }
    if (index != -1) {
        menuPtr->entries[index]->flags |= ENTRY_NEEDS_REDISPLAY;
    } else {
        for (index = 0; index < menuPtr->numEntries; index++) {
            menuPtr->entries[index]->flags |= ENTRY_NEEDS_REDISPLAY;
        }
    }
    if ((menuPtr->tkwin == NULL) || !Tk_IsMapped(menuPtr->tkwin)
            || (menuPtr->flags & REDRAW_PENDING)) {
        return;
    }
    Tk_DoWhenIdle(DisplayMenu, (ClientData) menuPtr);
    menuPtr->flags |= REDRAW_PENDING;
}
\f
/*
 *--------------------------------------------------------------
 *
 * PostSubmenu --
 *
 *      This procedure arranges for a particular submenu (i.e. the
 *      menu corresponding to a given cascade entry) to be
 *      posted.
 *
 * Results:
 *      A standard Tcl return result.  Errors may occur in the
 *      Tcl commands generated to post and unpost submenus.
 *
 * Side effects:
 *      If there is already a submenu posted, it is unposted.
 *      The new submenu is then posted.
 *
 *--------------------------------------------------------------
 */

static int
PostSubmenu(interp, menuPtr, mePtr)
    Tcl_Interp *interp;         /* Used for invoking sub-commands and
                                 * reporting errors. */
    register Menu *menuPtr;     /* Information about menu as a whole. */
    register MenuEntry *mePtr;  /* Info about submenu that is to be
                                 * posted.  NULL means make sure that
                                 * no submenu is posted. */
{
    char string[30];
    int result, x, y;

    if (mePtr == menuPtr->postedCascade) {
        return TCL_OK;
    }

    if (menuPtr->postedCascade != NULL) {
        result = Tcl_VarEval(interp, menuPtr->postedCascade->name,
                " unpost", (char *) NULL);
        menuPtr->postedCascade = NULL;
        if (result != TCL_OK) {
            return result;
        }
    }

    if ((mePtr != NULL) && (mePtr->name != NULL)) {
        Tk_GetRootCoords(menuPtr->tkwin, &x, &y);
        x += Tk_Width(menuPtr->tkwin);
        y += mePtr->y;
        sprintf(string, "%d %d ", x, y);
        result = Tcl_VarEval(interp, mePtr->name, " post ", string,
                menuPtr->group, (char *) NULL);
        if (result != TCL_OK) {
            return result;
        }
        menuPtr->postedCascade = mePtr;
    }
    return TCL_OK;
}
\f
/*
 *----------------------------------------------------------------------
 *
 * ActivateMenuEntry --
 *
 *      This procedure is invoked to make a particular menu entry
 *      the active one, deactivating any other entry that might
 *      currently be active.
 *
 * Results:
 *      The return value is a standard Tcl result (errors can occur
 *      while posting and unposting submenus).
 *
 * Side effects:
 *      Menu entries get redisplayed, and the active entry changes.
 *      Submenus may get posted and unposted.
 *
 *----------------------------------------------------------------------
 */

static int
ActivateMenuEntry(menuPtr, index)
    register Menu *menuPtr;             /* Menu in which to activate. */
    int index;                          /* Index of entry to activate, or
                                         * -1 to deactivate all entries. */
{
    register MenuEntry *mePtr;
    int result = TCL_OK;

    if (menuPtr->active >= 0) {
        mePtr = menuPtr->entries[menuPtr->active];

        /*
         * Don't change the state unless it's currently active (state
         * might already have been changed to disabled).
         */

        if (mePtr->state == tkActiveUid) {
            mePtr->state = tkNormalUid;
        }
        EventuallyRedrawMenu(menuPtr, menuPtr->active);
    }
    menuPtr->active = index;
    if (index >= 0) {
        mePtr = menuPtr->entries[index];
        mePtr->state = tkActiveUid;
        EventuallyRedrawMenu(menuPtr, index);
        Tk_Preserve((ClientData) mePtr);
        if (mePtr->type == CASCADE_ENTRY) {
            result = PostSubmenu(menuPtr->interp, menuPtr, mePtr);
        } else {
            result = PostSubmenu(menuPtr->interp, menuPtr, (MenuEntry *) NULL);
        }
        Tk_Release((ClientData) mePtr);
    }
    return result;
}