shared_source/c_tk_base_7_5_w_mods/tkwindow.c

/* $Header$ */

/* 
 * tkWindow.c --
 *
 *      This file provides basic window-manipulation procedures,
 *      which are equivalent to procedures in Xlib (and even
 *      invoke them) but also maintain the local Tk_Window
 *      structure.
 *
 * Copyright (c) 1989-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tkwindow.c,v 1.1.1.1 2001/06/13 05:12:54 dtashley Exp $
 */

#include "tkPort.h"
#include "tkInt.h"

#if !defined(__WIN32__) && !defined(MAC_TCL)
#include "tkUnixInt.h"
#endif


typedef struct ThreadSpecificData {
    int numMainWindows;    /* Count of numver of main windows currently
                            * open in this thread. */
    TkMainInfo *mainWindowList;
                           /* First in list of all main windows managed
                            * by this thread. */
    TkDisplay *displayList;
                           /* List of all displays currently in use by 
                            * the current thread. */
    int initialized;       /* 0 means the structures above need 
                            * initializing. */
} ThreadSpecificData;
static Tcl_ThreadDataKey dataKey;

/* 
 * The Mutex below is used to lock access to the Tk_Uid structs above. 
 */

TCL_DECLARE_MUTEX(windowMutex)

/*
 * Default values for "changes" and "atts" fields of TkWindows.  Note
 * that Tk always requests all events for all windows, except StructureNotify
 * events on internal windows:  these events are generated internally.
 */

static XWindowChanges defChanges = {
    0, 0, 1, 1, 0, 0, Above
};
#define ALL_EVENTS_MASK \
    KeyPressMask|KeyReleaseMask|ButtonPressMask|ButtonReleaseMask| \
    EnterWindowMask|LeaveWindowMask|PointerMotionMask|ExposureMask| \
    VisibilityChangeMask|PropertyChangeMask|ColormapChangeMask
static XSetWindowAttributes defAtts= {
    None,                       /* background_pixmap */
    0,                          /* background_pixel */
    CopyFromParent,             /* border_pixmap */
    0,                          /* border_pixel */
    NorthWestGravity,           /* bit_gravity */
    NorthWestGravity,           /* win_gravity */
    NotUseful,                  /* backing_store */
    (unsigned) ~0,              /* backing_planes */
    0,                          /* backing_pixel */
    False,                      /* save_under */
    ALL_EVENTS_MASK,            /* event_mask */
    0,                          /* do_not_propagate_mask */
    False,                      /* override_redirect */
    CopyFromParent,             /* colormap */
    None                        /* cursor */
};

/*
 * The following structure defines all of the commands supported by
 * Tk, and the C procedures that execute them.
 */

typedef struct {
    char *name;                 /* Name of command. */
    Tcl_CmdProc *cmdProc;       /* Command's string-based procedure. */
    Tcl_ObjCmdProc *objProc;    /* Command's object-based procedure. */
    int isSafe;                 /* If !0, this command will be exposed in
                                 * a safe interpreter. Otherwise it will be
                                 * hidden in a safe interpreter. */
    int passMainWindow;         /* 0 means provide NULL clientData to
                                 * command procedure; 1 means pass main
                                 * window as clientData to command
                                 * procedure. */
} TkCmd;

static TkCmd commands[] = {
    /*
     * Commands that are part of the intrinsics:
     */

    {"bell",            NULL,                   Tk_BellObjCmd,          0, 1},
    {"bind",            Tk_BindCmd,             NULL,                   1, 1},
    {"bindtags",        Tk_BindtagsCmd,         NULL,                   1, 1},
    {"clipboard",       Tk_ClipboardCmd,        NULL,                   0, 1},
    {"destroy",         NULL,                   Tk_DestroyObjCmd,       1, 1},
    {"event",           NULL,                   Tk_EventObjCmd,         1, 1},
    {"focus",           NULL,                   Tk_FocusObjCmd,         1, 1},
    {"font",            NULL,                   Tk_FontObjCmd,          1, 1},
    {"grab",            Tk_GrabCmd,             NULL,                   0, 1},
    {"grid",            Tk_GridCmd,             NULL,                   1, 1},
    {"image",           NULL,                   Tk_ImageObjCmd,         1, 1},
    {"lower",           NULL,                   Tk_LowerObjCmd,         1, 1},
    {"option",          NULL,                   Tk_OptionObjCmd,        1, 1},
    {"pack",            Tk_PackCmd,             NULL,                   1, 1},
    {"place",           Tk_PlaceCmd,            NULL,                   1, 1},
    {"raise",           NULL,                   Tk_RaiseObjCmd,         1, 1},
    {"selection",       Tk_SelectionCmd,        NULL,                   0, 1},
    {"tk",              NULL,                   Tk_TkObjCmd,            0, 1},
    {"tkwait",          Tk_TkwaitCmd,           NULL,                   1, 1},
#if defined(__WIN32__) || defined(MAC_TCL)
    {"tk_chooseColor",  NULL,                   Tk_ChooseColorObjCmd,   0, 1},
    {"tk_chooseDirectory", NULL,                Tk_ChooseDirectoryObjCmd, 0, 1},
    {"tk_getOpenFile",  NULL,                   Tk_GetOpenFileObjCmd,   0, 1},
    {"tk_getSaveFile",  NULL,                   Tk_GetSaveFileObjCmd,   0, 1},
#endif
#ifdef __WIN32__
    {"tk_messageBox",   NULL,                   Tk_MessageBoxObjCmd,    0, 1},
#endif
    {"update",          NULL,                   Tk_UpdateObjCmd,        1, 1},
    {"winfo",           NULL,                   Tk_WinfoObjCmd,         1, 1},
    {"wm",              Tk_WmCmd,               NULL,                   0, 1},

    /*
     * Widget class commands.
     */

    {"button",          NULL,                   Tk_ButtonObjCmd,        1, 0},
    {"canvas",          NULL,                   Tk_CanvasObjCmd,        1, 1},
    {"checkbutton",     NULL,                   Tk_CheckbuttonObjCmd,   1, 0},
    {"entry",           NULL,                   Tk_EntryObjCmd,         1, 0},
    {"frame",           NULL,                   Tk_FrameObjCmd,         1, 1},
    {"label",           NULL,                   Tk_LabelObjCmd,         1, 0},
    {"listbox",         NULL,                   Tk_ListboxObjCmd,       1, 0},
    {"menubutton",      NULL,                   Tk_MenubuttonObjCmd,    1, 0},
    {"message",         Tk_MessageCmd,          NULL,                   1, 1},
    {"radiobutton",     NULL,                   Tk_RadiobuttonObjCmd,   1, 0},
    {"scale",           NULL,                   Tk_ScaleObjCmd,         1, 0},
    {"scrollbar",       Tk_ScrollbarCmd,        NULL,                   1, 1},
    {"text",            Tk_TextCmd,             NULL,                   1, 1},
    {"toplevel",        NULL,                   Tk_ToplevelObjCmd,      0, 1},

    /*
     * Misc.
     */

#ifdef MAC_TCL
    {"unsupported1",    TkUnsupported1Cmd,      NULL,                   1, 1},
#endif
    {(char *) NULL,     (int (*) _ANSI_ARGS_((ClientData, Tcl_Interp *, int, char **))) NULL, NULL, 0}
};

/*
 * The variables and table below are used to parse arguments from
 * the "argv" variable in Tk_Init.
 */

static int synchronize = 0;
static char *name = NULL;
static char *display = NULL;
static char *geometry = NULL;
static char *colormap = NULL;
static char *use = NULL;
static char *visual = NULL;
static int rest = 0;

static Tk_ArgvInfo argTable[] = {
    {"-colormap", TK_ARGV_STRING, (char *) NULL, (char *) &colormap,
        "Colormap for main window"},
    {"-display", TK_ARGV_STRING, (char *) NULL, (char *) &display,
        "Display to use"},
    {"-geometry", TK_ARGV_STRING, (char *) NULL, (char *) &geometry,
        "Initial geometry for window"},
    {"-name", TK_ARGV_STRING, (char *) NULL, (char *) &name,
        "Name to use for application"},
    {"-sync", TK_ARGV_CONSTANT, (char *) 1, (char *) &synchronize,
        "Use synchronous mode for display server"},
    {"-visual", TK_ARGV_STRING, (char *) NULL, (char *) &visual,
        "Visual for main window"},
    {"-use", TK_ARGV_STRING, (char *) NULL, (char *) &use,
        "Id of window in which to embed application"},
    {"--", TK_ARGV_REST, (char *) 1, (char *) &rest,
        "Pass all remaining arguments through to script"},
    {(char *) NULL, TK_ARGV_END, (char *) NULL, (char *) NULL,
        (char *) NULL}
};

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

static Tk_Window        CreateTopLevelWindow _ANSI_ARGS_((Tcl_Interp *interp,
                            Tk_Window parent, char *name, char *screenName));
static void             DeleteWindowsExitProc _ANSI_ARGS_((
                            ClientData clientData));
static TkDisplay *      GetScreen _ANSI_ARGS_((Tcl_Interp *interp,
                            char *screenName, int *screenPtr));
static int              Initialize _ANSI_ARGS_((Tcl_Interp *interp));
static int              NameWindow _ANSI_ARGS_((Tcl_Interp *interp,
                            TkWindow *winPtr, TkWindow *parentPtr,
                            char *name));
static void             OpenIM _ANSI_ARGS_((TkDisplay *dispPtr));
static void             UnlinkWindow _ANSI_ARGS_((TkWindow *winPtr));

/*
 *----------------------------------------------------------------------
 *
 * CreateTopLevelWindow --
 *
 *      Make a new window that will be at top-level (its parent will
 *      be the root window of a screen).
 *
 * Results:
 *      The return value is a token for the new window, or NULL if
 *      an error prevented the new window from being created.  If
 *      NULL is returned, an error message will be left in
 *      the interp's result.
 *
 * Side effects:
 *      A new window structure is allocated locally.  An X
 *      window is NOT initially created, but will be created
 *      the first time the window is mapped.
 *
 *----------------------------------------------------------------------
 */

static Tk_Window
CreateTopLevelWindow(interp, parent, name, screenName)
    Tcl_Interp *interp;         /* Interpreter to use for error reporting. */
    Tk_Window parent;           /* Token for logical parent of new window
                                 * (used for naming, options, etc.).  May
                                 * be NULL. */
    char *name;                 /* Name for new window;  if parent is
                                 * non-NULL, must be unique among parent's
                                 * children. */
    char *screenName;           /* Name of screen on which to create
                                 * window.  NULL means use DISPLAY environment
                                 * variable to determine.  Empty string means
                                 * use parent's screen, or DISPLAY if no
                                 * parent. */
{
    register TkWindow *winPtr;
    register TkDisplay *dispPtr;
    int screenId;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    if (!tsdPtr->initialized) {
        tsdPtr->initialized = 1;

        /*
         * Create built-in image types.
         */
    
        Tk_CreateImageType(&tkBitmapImageType);
        Tk_CreateImageType(&tkPhotoImageType);
    
        /*
         * Create built-in photo image formats.
         */
    
        Tk_CreatePhotoImageFormat(&tkImgFmtGIF);
        Tk_CreateOldPhotoImageFormat(&tkImgFmtPPM);

        /*
         * Create exit handler to delete all windows when the application
         * exits.
         */

        Tcl_CreateExitHandler(DeleteWindowsExitProc, (ClientData) NULL);
    }

    if ((parent != NULL) && (screenName != NULL) && (screenName[0] == '\0')) {
        dispPtr = ((TkWindow *) parent)->dispPtr;
        screenId = Tk_ScreenNumber(parent);
    } else {
        dispPtr = GetScreen(interp, screenName, &screenId);
        if (dispPtr == NULL) {
            return (Tk_Window) NULL;
        }
    }

    winPtr = TkAllocWindow(dispPtr, screenId, (TkWindow *) parent);

    /*
     * Force the window to use a border pixel instead of border pixmap. 
     * This is needed for the case where the window doesn't use the
     * default visual.  In this case, the default border is a pixmap
     * inherited from the root window, which won't work because it will
     * have the wrong visual.
     */

    winPtr->dirtyAtts |= CWBorderPixel;

    /*
     * (Need to set the TK_TOP_LEVEL flag immediately here;  otherwise
     * Tk_DestroyWindow will core dump if it is called before the flag
     * has been set.)
     */

    winPtr->flags |= TK_TOP_LEVEL;

    if (parent != NULL) {
        if (NameWindow(interp, winPtr, (TkWindow *) parent, name) != TCL_OK) {
            Tk_DestroyWindow((Tk_Window) winPtr);
            return (Tk_Window) NULL;
        }
    }
    TkWmNewWindow(winPtr);

    return (Tk_Window) winPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * GetScreen --
 *
 *      Given a string name for a display-plus-screen, find the
 *      TkDisplay structure for the display and return the screen
 *      number too.
 *
 * Results:
 *      The return value is a pointer to information about the display,
 *      or NULL if the display couldn't be opened.  In this case, an
 *      error message is left in the interp's result.  The location at
 *      *screenPtr is overwritten with the screen number parsed from
 *      screenName.
 *
 * Side effects:
 *      A new connection is opened to the display if there is no
 *      connection already.  A new TkDisplay data structure is also
 *      setup, if necessary.
 *
 *----------------------------------------------------------------------
 */

static TkDisplay *
GetScreen(interp, screenName, screenPtr)
    Tcl_Interp *interp;         /* Place to leave error message. */
    char *screenName;           /* Name for screen.  NULL or empty means
                                 * use DISPLAY envariable. */
    int *screenPtr;             /* Where to store screen number. */
{
    register TkDisplay *dispPtr;
    char *p;
    int screenId;
    size_t length;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    /*
     * Separate the screen number from the rest of the display
     * name.  ScreenName is assumed to have the syntax
     * <display>.<screen> with the dot and the screen being
     * optional.
     */

    screenName = TkGetDefaultScreenName(interp, screenName);
    if (screenName == NULL) {
        Tcl_SetResult(interp,
                "no display name and no $DISPLAY environment variable",
                TCL_STATIC);
        return (TkDisplay *) NULL;
    }
    length = strlen(screenName);
    screenId = 0;
    p = screenName+length-1;
    while (isdigit(UCHAR(*p)) && (p != screenName)) {
        p--;
    }
    if ((*p == '.') && (p[1] != '\0')) {
        length = p - screenName;
        screenId = strtoul(p+1, (char **) NULL, 10);
    }

    /*
     * See if we already have a connection to this display.  If not,
     * then open a new connection.
     */

    for (dispPtr = TkGetDisplayList(); ; dispPtr = dispPtr->nextPtr) {
        if (dispPtr == NULL) {
            dispPtr = TkpOpenDisplay(screenName);
            if (dispPtr == NULL) {
                Tcl_AppendResult(interp, "couldn't connect to display \"",
                        screenName, "\"", (char *) NULL);
                return (TkDisplay *) NULL;
            }
            dispPtr->nextPtr = TkGetDisplayList();
            dispPtr->name = (char *) ckalloc((unsigned) (length+1));
            dispPtr->lastEventTime = CurrentTime;
            dispPtr->borderInit = 0;
            dispPtr->atomInit = 0;
            dispPtr->bindInfoStale = 1;
            dispPtr->modeModMask = 0;
            dispPtr->metaModMask = 0;
            dispPtr->altModMask = 0;
            dispPtr->numModKeyCodes = 0;
            dispPtr->modKeyCodes = NULL;
            dispPtr->bitmapInit = 0;
            dispPtr->bitmapAutoNumber = 0;
            dispPtr->numIdSearches = 0;
            dispPtr->numSlowSearches = 0;
            dispPtr->colorInit = 0;
            dispPtr->stressPtr = NULL;
            dispPtr->cursorInit = 0;
            dispPtr->cursorString[0] = '\0';
            dispPtr->cursorFont = None;
            dispPtr->errorPtr = NULL;
            dispPtr->deleteCount = 0;
            dispPtr->delayedMotionPtr = NULL;
            dispPtr->focusDebug = 0;
            dispPtr->implicitWinPtr = NULL;
            dispPtr->focusPtr = NULL;
            dispPtr->gcInit = 0;
            dispPtr->geomInit = 0;
            dispPtr->uidInit = 0;
            dispPtr->grabWinPtr = NULL;
            dispPtr->eventualGrabWinPtr = NULL;
            dispPtr->buttonWinPtr = NULL;
            dispPtr->serverWinPtr = NULL;
            dispPtr->firstGrabEventPtr = NULL;
            dispPtr->lastGrabEventPtr = NULL;
            dispPtr->grabFlags = 0;
            dispPtr->mouseButtonState = 0;
            dispPtr->warpInProgress = 0;
            dispPtr->warpWindow = None;
            dispPtr->warpX = 0;
            dispPtr->warpY = 0;
            dispPtr->gridInit = 0;
            dispPtr->imageId = 0;
            dispPtr->packInit = 0;
            dispPtr->placeInit = 0;
            dispPtr->selectionInfoPtr = NULL;
            dispPtr->multipleAtom = None;
            dispPtr->clipWindow = NULL;
            dispPtr->clipboardActive = 0;
            dispPtr->clipboardAppPtr = NULL;
            dispPtr->clipTargetPtr = NULL;
            dispPtr->commTkwin = NULL;
            dispPtr->wmTracing = 0;
            dispPtr->firstWmPtr = NULL;
            dispPtr->foregroundWmPtr = NULL;
            dispPtr->destroyCount = 0;
            dispPtr->lastDestroyRequest = 0;
            dispPtr->cmapPtr = NULL;
            Tcl_InitHashTable(&dispPtr->winTable, TCL_ONE_WORD_KEYS);

            dispPtr->refCount = 0;
            strncpy(dispPtr->name, screenName, length);
            dispPtr->name[length] = '\0';
            dispPtr->useInputMethods = 0;
            OpenIM(dispPtr);
            TkInitXId(dispPtr);

            tsdPtr->displayList = dispPtr;
            break;
        }
        if ((strncmp(dispPtr->name, screenName, length) == 0)
                && (dispPtr->name[length] == '\0')) {
            break;
        }
    }
    if (screenId >= ScreenCount(dispPtr->display)) {
        char buf[32 + TCL_INTEGER_SPACE];
        
        sprintf(buf, "bad screen number \"%d\"", screenId);
        Tcl_SetResult(interp, buf, TCL_VOLATILE);
        return (TkDisplay *) NULL;
    }
    *screenPtr = screenId;
    return dispPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * TkGetDisplay --
 *
 *      Given an X display, TkGetDisplay returns the TkDisplay 
 *      structure for the display.
 *
 * Results:
 *      The return value is a pointer to information about the display,
 *      or NULL if the display did not have a TkDisplay structure.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */

TkDisplay *
TkGetDisplay(display)
     Display *display;          /* X's display pointer */
{
    TkDisplay *dispPtr;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    for (dispPtr = tsdPtr->displayList; dispPtr != NULL;
            dispPtr = dispPtr->nextPtr) {
        if (dispPtr->display == display) {
            break;
        }
    }
    return dispPtr;
}

/*
 *--------------------------------------------------------------
 *
 * TkGetDisplayList --
 *
 *      This procedure returns a pointer to the thread-local
 *      list of TkDisplays corresponding to the open displays.
 *
 * Results:
 *      The return value is a pointer to the first TkDisplay
 *      structure in thread-local-storage.
 *
 * Side effects:
 *      None.
 *
 *--------------------------------------------------------------
 */
TkDisplay *
TkGetDisplayList()
{
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
    
    return tsdPtr->displayList;
}

/*
 *--------------------------------------------------------------
 *
 * TkGetMainInfoList --
 *
 *      This procedure returns a pointer to the list of structures
 *      containing information about all main windows for the
 *      current thread.
 *
 * Results:
 *      The return value is a pointer to the first TkMainInfo
 *      structure in thread local storage.
 *
 * Side effects:
 *      None.
 *
 *--------------------------------------------------------------
 */
TkMainInfo *
TkGetMainInfoList()
{
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
    
    return tsdPtr->mainWindowList;
}
/*
 *--------------------------------------------------------------
 *
 * TkAllocWindow --
 *
 *      This procedure creates and initializes a TkWindow structure.
 *
 * Results:
 *      The return value is a pointer to the new window.
 *
 * Side effects:
 *      A new window structure is allocated and all its fields are
 *      initialized.
 *
 *--------------------------------------------------------------
 */

TkWindow *
TkAllocWindow(dispPtr, screenNum, parentPtr)
    TkDisplay *dispPtr;         /* Display associated with new window. */
    int screenNum;              /* Index of screen for new window. */
    TkWindow *parentPtr;        /* Parent from which this window should
                                 * inherit visual information.  NULL means
                                 * use screen defaults instead of
                                 * inheriting. */
{
    register TkWindow *winPtr;

    winPtr = (TkWindow *) ckalloc(sizeof(TkWindow));
    winPtr->display = dispPtr->display;
    winPtr->dispPtr = dispPtr;
    winPtr->screenNum = screenNum;
    if ((parentPtr != NULL) && (parentPtr->display == winPtr->display)
            && (parentPtr->screenNum == winPtr->screenNum)) {
        winPtr->visual = parentPtr->visual;
        winPtr->depth = parentPtr->depth;
    } else {
        winPtr->visual = DefaultVisual(dispPtr->display, screenNum);
        winPtr->depth = DefaultDepth(dispPtr->display, screenNum);
    }
    winPtr->window = None;
    winPtr->childList = NULL;
    winPtr->lastChildPtr = NULL;
    winPtr->parentPtr = NULL;
    winPtr->nextPtr = NULL;
    winPtr->mainPtr = NULL;
    winPtr->pathName = NULL;
    winPtr->nameUid = NULL;
    winPtr->classUid = NULL;
    winPtr->changes = defChanges;
    winPtr->dirtyChanges = CWX|CWY|CWWidth|CWHeight|CWBorderWidth;
    winPtr->atts = defAtts;
    if ((parentPtr != NULL) && (parentPtr->display == winPtr->display)
            && (parentPtr->screenNum == winPtr->screenNum)) {
        winPtr->atts.colormap = parentPtr->atts.colormap;
    } else {
        winPtr->atts.colormap = DefaultColormap(dispPtr->display, screenNum);
    }
    winPtr->dirtyAtts = CWEventMask|CWColormap|CWBitGravity;
    winPtr->flags = 0;
    winPtr->handlerList = NULL;
#ifdef TK_USE_INPUT_METHODS
    winPtr->inputContext = NULL;
#endif /* TK_USE_INPUT_METHODS */
    winPtr->tagPtr = NULL;
    winPtr->numTags = 0;
    winPtr->optionLevel = -1;
    winPtr->selHandlerList = NULL;
    winPtr->geomMgrPtr = NULL;
    winPtr->geomData = NULL;
    winPtr->reqWidth = winPtr->reqHeight = 1;
    winPtr->internalBorderWidth = 0;
    winPtr->wmInfoPtr = NULL;
    winPtr->classProcsPtr = NULL;
    winPtr->instanceData = NULL;
    winPtr->privatePtr = NULL;

    return winPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * NameWindow --
 *
 *      This procedure is invoked to give a window a name and insert
 *      the window into the hierarchy associated with a particular
 *      application.
 *
 * Results:
 *      A standard Tcl return value.
 *
 * Side effects:
 *      See above.
 *
 *----------------------------------------------------------------------
 */

static int
NameWindow(interp, winPtr, parentPtr, name)
    Tcl_Interp *interp;         /* Interpreter to use for error reporting. */
    register TkWindow *winPtr;  /* Window that is to be named and inserted. */
    TkWindow *parentPtr;        /* Pointer to logical parent for winPtr
                                 * (used for naming, options, etc.). */
    char *name;                 /* Name for winPtr;   must be unique among
                                 * parentPtr's children. */
{
#define FIXED_SIZE 200
    char staticSpace[FIXED_SIZE];
    char *pathName;
    int new;
    Tcl_HashEntry *hPtr;
    int length1, length2;

    /*
     * Setup all the stuff except name right away, then do the name stuff
     * last.  This is so that if the name stuff fails, everything else
     * will be properly initialized (needed to destroy the window cleanly
     * after the naming failure).
     */
    winPtr->parentPtr = parentPtr;
    winPtr->nextPtr = NULL;
    if (parentPtr->childList == NULL) {
        parentPtr->childList = winPtr;
    } else {
        parentPtr->lastChildPtr->nextPtr = winPtr;
    }
    parentPtr->lastChildPtr = winPtr;
    winPtr->mainPtr = parentPtr->mainPtr;
    winPtr->mainPtr->refCount++;
    winPtr->nameUid = Tk_GetUid(name);

    /*
     * Don't permit names that start with an upper-case letter:  this
     * will just cause confusion with class names in the option database.
     */

    if (isupper(UCHAR(name[0]))) {
        Tcl_AppendResult(interp,
                "window name starts with an upper-case letter: \"",
                name, "\"", (char *) NULL);
        return TCL_ERROR;
    }

    /*
     * To permit names of arbitrary length, must be prepared to malloc
     * a buffer to hold the new path name.  To run fast in the common
     * case where names are short, use a fixed-size buffer on the
     * stack.
     */

    length1 = strlen(parentPtr->pathName);
    length2 = strlen(name);
    if ((length1+length2+2) <= FIXED_SIZE) {
        pathName = staticSpace;
    } else {
        pathName = (char *) ckalloc((unsigned) (length1+length2+2));
    }
    if (length1 == 1) {
        pathName[0] = '.';
        strcpy(pathName+1, name);
    } else {
        strcpy(pathName, parentPtr->pathName);
        pathName[length1] = '.';
        strcpy(pathName+length1+1, name);
    }
    hPtr = Tcl_CreateHashEntry(&parentPtr->mainPtr->nameTable, pathName, &new);
    if (pathName != staticSpace) {
        ckfree(pathName);
    }
    if (!new) {
        Tcl_AppendResult(interp, "window name \"", name,
                "\" already exists in parent", (char *) NULL);
        return TCL_ERROR;
    }
    Tcl_SetHashValue(hPtr, winPtr);
    winPtr->pathName = Tcl_GetHashKey(&parentPtr->mainPtr->nameTable, hPtr);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TkCreateMainWindow --
 *
 *      Make a new main window.  A main window is a special kind of
 *      top-level window used as the outermost window in an
 *      application.
 *
 * Results:
 *      The return value is a token for the new window, or NULL if
 *      an error prevented the new window from being created.  If
 *      NULL is returned, an error message will be left in
 *      the interp's result.
 *
 * Side effects:
 *      A new window structure is allocated locally;  "interp" is
 *      associated with the window and registered for "send" commands
 *      under "baseName".  BaseName may be extended with an instance
 *      number in the form "#2" if necessary to make it globally
 *      unique.  Tk-related commands are bound into interp.
 *
 *----------------------------------------------------------------------
 */

Tk_Window
TkCreateMainWindow(interp, screenName, baseName)
    Tcl_Interp *interp;         /* Interpreter to use for error reporting. */
    char *screenName;           /* Name of screen on which to create
                                 * window.  Empty or NULL string means
                                 * use DISPLAY environment variable. */
    char *baseName;             /* Base name for application;  usually of the
                                 * form "prog instance". */
{
    Tk_Window tkwin;
    int dummy;
    int isSafe;
    Tcl_HashEntry *hPtr;
    register TkMainInfo *mainPtr;
    register TkWindow *winPtr;
    register TkCmd *cmdPtr;
    ClientData clientData;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
    
    /*
     * Panic if someone updated the TkWindow structure without
     * also updating the Tk_FakeWin structure (or vice versa).
     */

    if (sizeof(TkWindow) != sizeof(Tk_FakeWin)) {
        panic("TkWindow and Tk_FakeWin are not the same size");
    }

    /*
     * Create the basic TkWindow structure.
     */

    tkwin = CreateTopLevelWindow(interp, (Tk_Window) NULL, baseName,
            screenName);
    if (tkwin == NULL) {
        return NULL;
    }
    
    /*
     * Create the TkMainInfo structure for this application, and set
     * up name-related information for the new window.
     */

    winPtr = (TkWindow *) tkwin;
    mainPtr = (TkMainInfo *) ckalloc(sizeof(TkMainInfo));
    mainPtr->winPtr = winPtr;
    mainPtr->refCount = 1;
    mainPtr->interp = interp;
    Tcl_InitHashTable(&mainPtr->nameTable, TCL_STRING_KEYS);
    TkEventInit();
    TkBindInit(mainPtr);
    TkFontPkgInit(mainPtr);
    mainPtr->tlFocusPtr = NULL;
    mainPtr->displayFocusPtr = NULL;
    mainPtr->optionRootPtr = NULL;
    Tcl_InitHashTable(&mainPtr->imageTable, TCL_STRING_KEYS);
    mainPtr->strictMotif = 0;
    if (Tcl_LinkVar(interp, "tk_strictMotif", (char *) &mainPtr->strictMotif,
            TCL_LINK_BOOLEAN) != TCL_OK) {
        Tcl_ResetResult(interp);
    }
    mainPtr->nextPtr = tsdPtr->mainWindowList;
    tsdPtr->mainWindowList = mainPtr;
    winPtr->mainPtr = mainPtr;
    hPtr = Tcl_CreateHashEntry(&mainPtr->nameTable, ".", &dummy);
    Tcl_SetHashValue(hPtr, winPtr);
    winPtr->pathName = Tcl_GetHashKey(&mainPtr->nameTable, hPtr);

    /*
     * We have just created another Tk application; increment the refcount
     * on the display pointer.
     */

    winPtr->dispPtr->refCount++;

    /*
     * Register the interpreter for "send" purposes.
     */

    winPtr->nameUid = Tk_GetUid(Tk_SetAppName(tkwin, baseName));

    /*
     * Bind in Tk's commands.
     */

    isSafe = Tcl_IsSafe(interp);
    for (cmdPtr = commands; cmdPtr->name != NULL; cmdPtr++) {
        if ((cmdPtr->cmdProc == NULL) && (cmdPtr->objProc == NULL)) {
            panic("TkCreateMainWindow: builtin command with NULL string and object procs");
        }
        if (cmdPtr->passMainWindow) {
            clientData = (ClientData) tkwin;
        } else {
            clientData = (ClientData) NULL;
        }
        if (cmdPtr->cmdProc != NULL) {
            Tcl_CreateCommand(interp, cmdPtr->name, cmdPtr->cmdProc,
                    clientData, (void (*) _ANSI_ARGS_((ClientData))) NULL);
        } else {
            Tcl_CreateObjCommand(interp, cmdPtr->name, cmdPtr->objProc,
                    clientData, NULL);
        }
        if (isSafe) {
            if (!(cmdPtr->isSafe)) {
                Tcl_HideCommand(interp, cmdPtr->name, cmdPtr->name);
            }
        }
    }

    TkCreateMenuCmd(interp);

    /*
     * Set variables for the intepreter.
     */

    Tcl_SetVar(interp, "tk_patchLevel", TK_PATCH_LEVEL, TCL_GLOBAL_ONLY);
    Tcl_SetVar(interp, "tk_version", TK_VERSION, TCL_GLOBAL_ONLY);

    tsdPtr->numMainWindows++;
    return tkwin;
}

/*
 *--------------------------------------------------------------
 *
 * Tk_CreateWindow --
 *
 *      Create a new internal or top-level window as a child of an
 *      existing window.
 *
 * Results:
 *      The return value is a token for the new window.  This
 *      is not the same as X's token for the window.  If an error
 *      occurred in creating the window (e.g. no such display or
 *      screen), then an error message is left in the interp's result and
 *      NULL is returned.
 *
 * Side effects:
 *      A new window structure is allocated locally.  An X
 *      window is not initially created, but will be created
 *      the first time the window is mapped.
 *
 *--------------------------------------------------------------
 */

Tk_Window
Tk_CreateWindow(interp, parent, name, screenName)
    Tcl_Interp *interp;         /* Interpreter to use for error reporting.
                                 * the interp's result is assumed to be
                                 * initialized by the caller. */
    Tk_Window parent;           /* Token for parent of new window. */
    char *name;                 /* Name for new window.  Must be unique
                                 * among parent's children. */
    char *screenName;           /* If NULL, new window will be internal on
                                 * same screen as its parent.  If non-NULL,
                                 * gives name of screen on which to create
                                 * new window;  window will be a top-level
                                 * window. */
{
    TkWindow *parentPtr = (TkWindow *) parent;
    TkWindow *winPtr;

    if ((parentPtr != NULL) && (parentPtr->flags & TK_ALREADY_DEAD)) {
        Tcl_AppendResult(interp,
                "can't create window: parent has been destroyed",
                (char *) NULL);
        return NULL;
    } else if ((parentPtr != NULL) &&
            (parentPtr->flags & TK_CONTAINER)) {
        Tcl_AppendResult(interp,
                "can't create window: its parent has -container = yes",
                (char *) NULL);
        return NULL;
    }
    if (screenName == NULL) {
        winPtr = TkAllocWindow(parentPtr->dispPtr, parentPtr->screenNum,
                parentPtr);
        if (NameWindow(interp, winPtr, parentPtr, name) != TCL_OK) {
            Tk_DestroyWindow((Tk_Window) winPtr);
            return NULL;
        } else {
            return (Tk_Window) winPtr;
        }
    } else {
        return CreateTopLevelWindow(interp, parent, name, screenName);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_CreateWindowFromPath --
 *
 *      This procedure is similar to Tk_CreateWindow except that
 *      it uses a path name to create the window, rather than a
 *      parent and a child name.
 *
 * Results:
 *      The return value is a token for the new window.  This
 *      is not the same as X's token for the window.  If an error
 *      occurred in creating the window (e.g. no such display or
 *      screen), then an error message is left in the interp's result and
 *      NULL is returned.
 *
 * Side effects:
 *      A new window structure is allocated locally.  An X
 *      window is not initially created, but will be created
 *      the first time the window is mapped.
 *
 *----------------------------------------------------------------------
 */

Tk_Window
Tk_CreateWindowFromPath(interp, tkwin, pathName, screenName)
    Tcl_Interp *interp;         /* Interpreter to use for error reporting.
                                 * the interp's result is assumed to be
                                 * initialized by the caller. */
    Tk_Window tkwin;            /* Token for any window in application
                                 * that is to contain new window. */
    char *pathName;             /* Path name for new window within the
                                 * application of tkwin.  The parent of
                                 * this window must already exist, but
                                 * the window itself must not exist. */
    char *screenName;           /* If NULL, new window will be on same
                                 * screen as its parent.  If non-NULL,
                                 * gives name of screen on which to create
                                 * new window;  window will be a top-level
                                 * window. */
{
#define FIXED_SPACE 5
    char fixedSpace[FIXED_SPACE+1];
    char *p;
    Tk_Window parent;
    int numChars;

    /*
     * Strip the parent's name out of pathName (it's everything up
     * to the last dot).  There are two tricky parts: (a) must
     * copy the parent's name somewhere else to avoid modifying
     * the pathName string (for large names, space for the copy
     * will have to be malloc'ed);  (b) must special-case the
     * situation where the parent is ".".
     */

    p = strrchr(pathName, '.');
    if (p == NULL) {
        Tcl_AppendResult(interp, "bad window path name \"", pathName,
                "\"", (char *) NULL);
        return NULL;
    }
    numChars = p-pathName;
    if (numChars > FIXED_SPACE) {
        p = (char *) ckalloc((unsigned) (numChars+1));
    } else {
        p = fixedSpace;
    }
    if (numChars == 0) {
        *p = '.';
        p[1] = '\0';
    } else {
        strncpy(p, pathName, (size_t) numChars);
        p[numChars] = '\0';
    }

    /*
     * Find the parent window.
     */

    parent = Tk_NameToWindow(interp, p, tkwin);
    if (p != fixedSpace) {
        ckfree(p);
    }
    if (parent == NULL) {
        return NULL;
    }
    if (((TkWindow *) parent)->flags & TK_ALREADY_DEAD) {
        Tcl_AppendResult(interp, 
            "can't create window: parent has been destroyed", (char *) NULL);
        return NULL;
    } else if (((TkWindow *) parent)->flags & TK_CONTAINER) {
        Tcl_AppendResult(interp, 
            "can't create window: its parent has -container = yes",
                (char *) NULL);
        return NULL;
    }

    /*
     * Create the window.
     */

    if (screenName == NULL) {
        TkWindow *parentPtr = (TkWindow *) parent;
        TkWindow *winPtr;

        winPtr = TkAllocWindow(parentPtr->dispPtr, parentPtr->screenNum,
                parentPtr);
        if (NameWindow(interp, winPtr, parentPtr, pathName+numChars+1)
                != TCL_OK) {
            Tk_DestroyWindow((Tk_Window) winPtr);
            return NULL;
        } else {
            return (Tk_Window) winPtr;
        }
    } else {
        return CreateTopLevelWindow(interp, parent, pathName+numChars+1,
                screenName);
    }
}

/*
 *--------------------------------------------------------------
 *
 * Tk_DestroyWindow --
 *
 *      Destroy an existing window.  After this call, the caller
 *      should never again use the token.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The window is deleted, along with all of its children.
 *      Relevant callback procedures are invoked.
 *
 *--------------------------------------------------------------
 */

void
Tk_DestroyWindow(tkwin)
    Tk_Window tkwin;            /* Window to destroy. */
{
    TkWindow *winPtr = (TkWindow *) tkwin;
    TkDisplay *dispPtr = winPtr->dispPtr;
    XEvent event;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    if (winPtr->flags & TK_ALREADY_DEAD) {
        /*
         * A destroy event binding caused the window to be destroyed
         * again.  Ignore the request.
         */

        return;
    }
    winPtr->flags |= TK_ALREADY_DEAD;

    /*
     * Some cleanup needs to be done immediately, rather than later,
     * because it needs information that will be destoyed before we
     * get to the main cleanup point.  For example, TkFocusDeadWindow
     * needs to access the parentPtr field from a window, but if
     * a Destroy event handler deletes the window's parent this
     * field will be NULL before the main cleanup point is reached.
     */

    TkFocusDeadWindow(winPtr);

    /*
     * If this is a main window, remove it from the list of main
     * windows.  This needs to be done now (rather than later with
     * all the other main window cleanup) to handle situations where
     * a destroy binding for a window calls "exit".  In this case
     * the child window cleanup isn't complete when exit is called,
     * so the reference count of its application doesn't go to zero
     * when exit calls Tk_DestroyWindow on ".", so the main window
     * doesn't get removed from the list and exit loops infinitely.
     * Even worse, if "destroy ." is called by the destroy binding
     * before calling "exit", "exit" will attempt to destroy
     * mainPtr->winPtr, which no longer exists, and there may be a
     * core dump.
     *
     * Also decrement the display refcount so that if this is the
     * last Tk application in this process on this display, the display
     * can be closed and its data structures deleted.
     */

    if (winPtr->mainPtr->winPtr == winPtr) {
        dispPtr->refCount--;
        if (tsdPtr->mainWindowList == winPtr->mainPtr) {
            tsdPtr->mainWindowList = winPtr->mainPtr->nextPtr;
        } else {
            TkMainInfo *prevPtr;

            for (prevPtr = tsdPtr->mainWindowList;
                    prevPtr->nextPtr != winPtr->mainPtr;
                    prevPtr = prevPtr->nextPtr) {
                /* Empty loop body. */
            }
            prevPtr->nextPtr = winPtr->mainPtr->nextPtr;
        }
        tsdPtr->numMainWindows--;
    }

    /*
     * Recursively destroy children.
     */

    dispPtr->destroyCount++;
    while (winPtr->childList != NULL) {
        TkWindow *childPtr;
        childPtr = winPtr->childList;
        childPtr->flags |= TK_DONT_DESTROY_WINDOW;
        Tk_DestroyWindow((Tk_Window) childPtr);
        if (winPtr->childList == childPtr) {
            /*
             * The child didn't remove itself from the child list, so
             * let's remove it here.  This can happen in some strange
             * conditions, such as when a Delete event handler for a
             * window deletes the window's parent.
             */

            winPtr->childList = childPtr->nextPtr;
            childPtr->parentPtr = NULL;
        }
    }
    if ((winPtr->flags & (TK_CONTAINER|TK_BOTH_HALVES))
            == (TK_CONTAINER|TK_BOTH_HALVES)) {
        /*
         * This is the container for an embedded application, and
         * the embedded application is also in this process.  Delete
         * the embedded window in-line here, for the same reasons we
         * delete children in-line (otherwise, for example, the Tk
         * window may appear to exist even though its X window is
         * gone; this could cause errors).  Special note: it's possible
         * that the embedded window has already been deleted, in which
         * case TkpGetOtherWindow will return NULL.
         */

        TkWindow *childPtr;
        childPtr = TkpGetOtherWindow(winPtr);
        if (childPtr != NULL) {
            childPtr->flags |= TK_DONT_DESTROY_WINDOW;
            Tk_DestroyWindow((Tk_Window) childPtr);
        }
    }

    /*
     * Generate a DestroyNotify event.  In order for the DestroyNotify
     * event to be processed correctly, need to make sure the window
     * exists.  This is a bit of a kludge, and may be unnecessarily
     * expensive, but without it no event handlers will get called for
     * windows that don't exist yet.
     *
     * Note: if the window's pathName is NULL it means that the window
     * was not successfully initialized in the first place, so we should
     * not make the window exist or generate the event.
     */

    if (winPtr->pathName != NULL) {
        if (winPtr->window == None) {
            Tk_MakeWindowExist(tkwin);
        }
        event.type = DestroyNotify;
        event.xdestroywindow.serial =
                LastKnownRequestProcessed(winPtr->display);
        event.xdestroywindow.send_event = False;
        event.xdestroywindow.display = winPtr->display;
        event.xdestroywindow.event = winPtr->window;
        event.xdestroywindow.window = winPtr->window;
        Tk_HandleEvent(&event);
    }

    /*
     * Cleanup the data structures associated with this window.
     */

    if (winPtr->flags & TK_TOP_LEVEL) {
        TkWmDeadWindow(winPtr);
    } else if (winPtr->flags & TK_WM_COLORMAP_WINDOW) {
        TkWmRemoveFromColormapWindows(winPtr);
    }
    if (winPtr->window != None) {
#if defined(MAC_TCL) || defined(__WIN32__)
        XDestroyWindow(winPtr->display, winPtr->window);
#else
        if ((winPtr->flags & TK_TOP_LEVEL)
                || !(winPtr->flags & TK_DONT_DESTROY_WINDOW)) {
            /*
             * The parent has already been destroyed and this isn't
             * a top-level window, so this window will be destroyed
             * implicitly when the parent's X window is destroyed;
             * it's much faster not to do an explicit destroy of this
             * X window.
             */

            dispPtr->lastDestroyRequest = NextRequest(winPtr->display);
            XDestroyWindow(winPtr->display, winPtr->window);
        }
#endif
        TkFreeWindowId(dispPtr, winPtr->window);
        Tcl_DeleteHashEntry(Tcl_FindHashEntry(&dispPtr->winTable,
                (char *) winPtr->window));
        winPtr->window = None;
    }
    dispPtr->destroyCount--;
    UnlinkWindow(winPtr);
    TkEventDeadWindow(winPtr);
    TkBindDeadWindow(winPtr);
#ifdef TK_USE_INPUT_METHODS
    if (winPtr->inputContext != NULL) {
        XDestroyIC(winPtr->inputContext);
    }
#endif /* TK_USE_INPUT_METHODS */
    if (winPtr->tagPtr != NULL) {
        TkFreeBindingTags(winPtr);
    }
    TkOptionDeadWindow(winPtr);
    TkSelDeadWindow(winPtr);
    TkGrabDeadWindow(winPtr);
    if (winPtr->mainPtr != NULL) {
        if (winPtr->pathName != NULL) {
            Tk_DeleteAllBindings(winPtr->mainPtr->bindingTable,
                    (ClientData) winPtr->pathName);
            Tcl_DeleteHashEntry(Tcl_FindHashEntry(&winPtr->mainPtr->nameTable,
                    winPtr->pathName));
        }
        winPtr->mainPtr->refCount--;
        if (winPtr->mainPtr->refCount == 0) {
            register TkCmd *cmdPtr;

            /*
             * We just deleted the last window in the application.  Delete
             * the TkMainInfo structure too and replace all of Tk's commands
             * with dummy commands that return errors.  Also delete the
             * "send" command to unregister the interpreter.
             *
             * NOTE: Only replace the commands it if the interpreter is
             * not being deleted. If it *is*, the interpreter cleanup will
             * do all the needed work.
             */

            if ((winPtr->mainPtr->interp != NULL) &&
                    (!Tcl_InterpDeleted(winPtr->mainPtr->interp))) {
                for (cmdPtr = commands; cmdPtr->name != NULL; cmdPtr++) {
                    Tcl_CreateCommand(winPtr->mainPtr->interp, cmdPtr->name,
                            TkDeadAppCmd, (ClientData) NULL,
                            (void (*) _ANSI_ARGS_((ClientData))) NULL);
                }
                Tcl_CreateCommand(winPtr->mainPtr->interp, "send",
                        TkDeadAppCmd, (ClientData) NULL, 
                        (void (*) _ANSI_ARGS_((ClientData))) NULL);
                Tcl_UnlinkVar(winPtr->mainPtr->interp, "tk_strictMotif");
            }
                
            Tcl_DeleteHashTable(&winPtr->mainPtr->nameTable);
            TkBindFree(winPtr->mainPtr);
            TkDeleteAllImages(winPtr->mainPtr);
            TkFontPkgFree(winPtr->mainPtr);

            /*
             * When embedding Tk into other applications, make sure 
             * that all destroy events reach the server. Otherwise
             * the embedding application may also attempt to destroy
             * the windows, resulting in an X error
             */

            if (winPtr->flags & TK_EMBEDDED) {
                XSync(winPtr->display,False) ; 
            }
            ckfree((char *) winPtr->mainPtr);

            /*
             * If no other applications are using the display, close the
             * display now and relinquish its data structures.
             */
            
            if (dispPtr->refCount <= 0) {
#ifdef  NOT_YET
                /*
                 * I have disabled this code because on Windows there are
                 * still order dependencies in close-down. All displays
                 * and resources will get closed down properly anyway at
                 * exit, through the exit handler.
                 */
                
                TkDisplay *theDispPtr, *backDispPtr;
                
                /*
                 * Splice this display out of the list of displays.
                 */
                
                for (theDispPtr = displayList, backDispPtr = NULL;
                         (theDispPtr != winPtr->dispPtr) &&
                             (theDispPtr != NULL);
                         theDispPtr = theDispPtr->nextPtr) {
                    backDispPtr = theDispPtr;
                }
                if (theDispPtr == NULL) {
                    panic("could not find display to close!");
                }
                if (backDispPtr == NULL) {
                    displayList = theDispPtr->nextPtr;
                } else {
                    backDispPtr->nextPtr = theDispPtr->nextPtr;
                }
                
                /*
                 * Found and spliced it out, now actually do the cleanup.
                 */
                
                if (dispPtr->name != NULL) {
                    ckfree(dispPtr->name);
                }
                
                Tcl_DeleteHashTable(&(dispPtr->winTable));

                /*
                 * Cannot yet close the display because we still have
                 * order of deletion problems. Defer until exit handling
                 * instead. At that time, the display will cleanly shut
                 * down (hopefully..). (JYL)
                 */

                TkpCloseDisplay(dispPtr);

                /*
                 * There is lots more to clean up, we leave it at this for
                 * the time being.
                 */
#endif
            }
        }
    }
    ckfree((char *) winPtr);
}

/*
 *--------------------------------------------------------------
 *
 * Tk_MapWindow --
 *
 *      Map a window within its parent.  This may require the
 *      window and/or its parents to actually be created.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The given window will be mapped.  Windows may also
 *      be created.
 *
 *--------------------------------------------------------------
 */

void
Tk_MapWindow(tkwin)
    Tk_Window tkwin;            /* Token for window to map. */
{
    register TkWindow *winPtr = (TkWindow *) tkwin;
    XEvent event;

    if (winPtr->flags & TK_MAPPED) {
        return;
    }
    if (winPtr->window == None) {
        Tk_MakeWindowExist(tkwin);
    }
    if (winPtr->flags & TK_TOP_LEVEL) {
        /*
         * Lots of special processing has to be done for top-level
         * windows.  Let tkWm.c handle everything itself.
         */

        TkWmMapWindow(winPtr);
        return;
    }
    winPtr->flags |= TK_MAPPED;
    XMapWindow(winPtr->display, winPtr->window);
    event.type = MapNotify;
    event.xmap.serial = LastKnownRequestProcessed(winPtr->display);
    event.xmap.send_event = False;
    event.xmap.display = winPtr->display;
    event.xmap.event = winPtr->window;
    event.xmap.window = winPtr->window;
    event.xmap.override_redirect = winPtr->atts.override_redirect;
    Tk_HandleEvent(&event);
}

/*
 *--------------------------------------------------------------
 *
 * Tk_MakeWindowExist --
 *
 *      Ensure that a particular window actually exists.  This
 *      procedure shouldn't normally need to be invoked from
 *      outside the Tk package, but may be needed if someone
 *      wants to manipulate a window before mapping it.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      When the procedure returns, the X window associated with
 *      tkwin is guaranteed to exist.  This may require the
 *      window's ancestors to be created also.
 *
 *--------------------------------------------------------------
 */

void
Tk_MakeWindowExist(tkwin)
    Tk_Window tkwin;            /* Token for window. */
{
    register TkWindow *winPtr = (TkWindow *) tkwin;
    TkWindow *winPtr2;
    Window parent;
    Tcl_HashEntry *hPtr;
    int new;

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

    if ((winPtr->parentPtr == NULL) || (winPtr->flags & TK_TOP_LEVEL)) {
        parent = XRootWindow(winPtr->display, winPtr->screenNum);
    } else {
        if (winPtr->parentPtr->window == None) {
            Tk_MakeWindowExist((Tk_Window) winPtr->parentPtr);
        }
        parent = winPtr->parentPtr->window;
    }

    if (winPtr->classProcsPtr != NULL
            && winPtr->classProcsPtr->createProc != NULL) {
        winPtr->window = (*winPtr->classProcsPtr->createProc)(tkwin, parent,
                winPtr->instanceData);
    } else {
        winPtr->window = TkpMakeWindow(winPtr, parent);
    }

    hPtr = Tcl_CreateHashEntry(&winPtr->dispPtr->winTable,
            (char *) winPtr->window, &new);
    Tcl_SetHashValue(hPtr, winPtr);
    winPtr->dirtyAtts = 0;
    winPtr->dirtyChanges = 0;
#ifdef TK_USE_INPUT_METHODS
    winPtr->inputContext = NULL;
#endif /* TK_USE_INPUT_METHODS */

    if (!(winPtr->flags & TK_TOP_LEVEL)) {
        /*
         * If any siblings higher up in the stacking order have already
         * been created then move this window to its rightful position
         * in the stacking order.
         *
         * NOTE: this code ignores any changes anyone might have made
         * to the sibling and stack_mode field of the window's attributes,
         * so it really isn't safe for these to be manipulated except
         * by calling Tk_RestackWindow.
         */

        for (winPtr2 = winPtr->nextPtr; winPtr2 != NULL;
                winPtr2 = winPtr2->nextPtr) {
            if ((winPtr2->window != None)
                    && !(winPtr2->flags & (TK_TOP_LEVEL|TK_REPARENTED))) {
                XWindowChanges changes;
                changes.sibling = winPtr2->window;
                changes.stack_mode = Below;
                XConfigureWindow(winPtr->display, winPtr->window,
                        CWSibling|CWStackMode, &changes);
                break;
            }
        }

        /*
         * If this window has a different colormap than its parent, add
         * the window to the WM_COLORMAP_WINDOWS property for its top-level.
         */

        if ((winPtr->parentPtr != NULL) &&
                (winPtr->atts.colormap != winPtr->parentPtr->atts.colormap)) {
            TkWmAddToColormapWindows(winPtr);
            winPtr->flags |= TK_WM_COLORMAP_WINDOW;
        }
    }

    /*
     * Issue a ConfigureNotify event if there were deferred configuration
     * changes (but skip it if the window is being deleted;  the
     * ConfigureNotify event could cause problems if we're being called
     * from Tk_DestroyWindow under some conditions).
     */

    if ((winPtr->flags & TK_NEED_CONFIG_NOTIFY)
            && !(winPtr->flags & TK_ALREADY_DEAD)){
        winPtr->flags &= ~TK_NEED_CONFIG_NOTIFY;
        TkDoConfigureNotify(winPtr);
    }
}

/*
 *--------------------------------------------------------------
 *
 * Tk_UnmapWindow, etc. --
 *
 *      There are several procedures under here, each of which
 *      mirrors an existing X procedure.  In addition to performing
 *      the functions of the corresponding procedure, each
 *      procedure also updates the local window structure and
 *      synthesizes an X event (if the window's structure is being
 *      managed internally).
 *
 * Results:
 *      See the manual entries.
 *
 * Side effects:
 *      See the manual entries.
 *
 *--------------------------------------------------------------
 */

void
Tk_UnmapWindow(tkwin)
    Tk_Window tkwin;            /* Token for window to unmap. */
{
    register TkWindow *winPtr = (TkWindow *) tkwin;

    if (!(winPtr->flags & TK_MAPPED) || (winPtr->flags & TK_ALREADY_DEAD)) {
        return;
    }
    if (winPtr->flags & TK_TOP_LEVEL) {
        /*
         * Special processing has to be done for top-level windows.  Let
         * tkWm.c handle everything itself.
         */

        TkWmUnmapWindow(winPtr);
        return;
    }
    winPtr->flags &= ~TK_MAPPED;
    XUnmapWindow(winPtr->display, winPtr->window);
    if (!(winPtr->flags & TK_TOP_LEVEL)) {
        XEvent event;

        event.type = UnmapNotify;
        event.xunmap.serial = LastKnownRequestProcessed(winPtr->display);
        event.xunmap.send_event = False;
        event.xunmap.display = winPtr->display;
        event.xunmap.event = winPtr->window;
        event.xunmap.window = winPtr->window;
        event.xunmap.from_configure = False;
        Tk_HandleEvent(&event);
    }
}

void
Tk_ConfigureWindow(tkwin, valueMask, valuePtr)
    Tk_Window tkwin;            /* Window to re-configure. */
    unsigned int valueMask;     /* Mask indicating which parts of
                                 * *valuePtr are to be used. */
    XWindowChanges *valuePtr;   /* New values. */
{
    register TkWindow *winPtr = (TkWindow *) tkwin;

    if (valueMask & CWX) {
        winPtr->changes.x = valuePtr->x;
    }
    if (valueMask & CWY) {
        winPtr->changes.y = valuePtr->y;
    }
    if (valueMask & CWWidth) {
        winPtr->changes.width = valuePtr->width;
    }
    if (valueMask & CWHeight) {
        winPtr->changes.height = valuePtr->height;
    }
    if (valueMask & CWBorderWidth) {
        winPtr->changes.border_width = valuePtr->border_width;
    }
    if (valueMask & (CWSibling|CWStackMode)) {
        panic("Can't set sibling or stack mode from Tk_ConfigureWindow.");
    }

    if (winPtr->window != None) {
        XConfigureWindow(winPtr->display, winPtr->window,
                valueMask, valuePtr);
        TkDoConfigureNotify(winPtr);
    } else {
        winPtr->dirtyChanges |= valueMask;
        winPtr->flags |= TK_NEED_CONFIG_NOTIFY;
    }
}

void
Tk_MoveWindow(tkwin, x, y)
    Tk_Window tkwin;            /* Window to move. */
    int x, y;                   /* New location for window (within
                                 * parent). */
{
    register TkWindow *winPtr = (TkWindow *) tkwin;

    winPtr->changes.x = x;
    winPtr->changes.y = y;
    if (winPtr->window != None) {
        XMoveWindow(winPtr->display, winPtr->window, x, y);
        TkDoConfigureNotify(winPtr);
    } else {
        winPtr->dirtyChanges |= CWX|CWY;
        winPtr->flags |= TK_NEED_CONFIG_NOTIFY;
    }
}

void
Tk_ResizeWindow(tkwin, width, height)
    Tk_Window tkwin;            /* Window to resize. */
    int width, height;          /* New dimensions for window. */
{
    register TkWindow *winPtr = (TkWindow *) tkwin;

    winPtr->changes.width = (unsigned) width;
    winPtr->changes.height = (unsigned) height;
    if (winPtr->window != None) {
        XResizeWindow(winPtr->display, winPtr->window, (unsigned) width,
                (unsigned) height);
        TkDoConfigureNotify(winPtr);
    } else {
        winPtr->dirtyChanges |= CWWidth|CWHeight;
        winPtr->flags |= TK_NEED_CONFIG_NOTIFY;
    }
}

void
Tk_MoveResizeWindow(tkwin, x, y, width, height)
    Tk_Window tkwin;            /* Window to move and resize. */
    int x, y;                   /* New location for window (within
                                 * parent). */
    int width, height;          /* New dimensions for window. */
{
    register TkWindow *winPtr = (TkWindow *) tkwin;

    winPtr->changes.x = x;
    winPtr->changes.y = y;
    winPtr->changes.width = (unsigned) width;
    winPtr->changes.height = (unsigned) height;
    if (winPtr->window != None) {
        XMoveResizeWindow(winPtr->display, winPtr->window, x, y,
                (unsigned) width, (unsigned) height);
        TkDoConfigureNotify(winPtr);
    } else {
        winPtr->dirtyChanges |= CWX|CWY|CWWidth|CWHeight;
        winPtr->flags |= TK_NEED_CONFIG_NOTIFY;
    }
}

void
Tk_SetWindowBorderWidth(tkwin, width)
    Tk_Window tkwin;            /* Window to modify. */
    int width;                  /* New border width for window. */
{
    register TkWindow *winPtr = (TkWindow *) tkwin;

    winPtr->changes.border_width = width;
    if (winPtr->window != None) {
        XSetWindowBorderWidth(winPtr->display, winPtr->window,
                (unsigned) width);
        TkDoConfigureNotify(winPtr);
    } else {
        winPtr->dirtyChanges |= CWBorderWidth;
        winPtr->flags |= TK_NEED_CONFIG_NOTIFY;
    }
}

void
Tk_ChangeWindowAttributes(tkwin, valueMask, attsPtr)
    Tk_Window tkwin;            /* Window to manipulate. */
    unsigned long valueMask;    /* OR'ed combination of bits,
                                 * indicating which fields of
                                 * *attsPtr are to be used. */
    register XSetWindowAttributes *attsPtr;
                                /* New values for some attributes. */
{
    register TkWindow *winPtr = (TkWindow *) tkwin;

    if (valueMask & CWBackPixmap) {
        winPtr->atts.background_pixmap = attsPtr->background_pixmap;
    }
    if (valueMask & CWBackPixel) {
        winPtr->atts.background_pixel = attsPtr->background_pixel;
    }
    if (valueMask & CWBorderPixmap) {
        winPtr->atts.border_pixmap = attsPtr->border_pixmap;
    }
    if (valueMask & CWBorderPixel) {
        winPtr->atts.border_pixel = attsPtr->border_pixel;
    }
    if (valueMask & CWBitGravity) {
        winPtr->atts.bit_gravity = attsPtr->bit_gravity;
    }
    if (valueMask & CWWinGravity) {
        winPtr->atts.win_gravity = attsPtr->win_gravity;
    }
    if (valueMask & CWBackingStore) {
        winPtr->atts.backing_store = attsPtr->backing_store;
    }
    if (valueMask & CWBackingPlanes) {
        winPtr->atts.backing_planes = attsPtr->backing_planes;
    }
    if (valueMask & CWBackingPixel) {
        winPtr->atts.backing_pixel = attsPtr->backing_pixel;
    }
    if (valueMask & CWOverrideRedirect) {
        winPtr->atts.override_redirect = attsPtr->override_redirect;
    }
    if (valueMask & CWSaveUnder) {
        winPtr->atts.save_under = attsPtr->save_under;
    }
    if (valueMask & CWEventMask) {
        winPtr->atts.event_mask = attsPtr->event_mask;
    }
    if (valueMask & CWDontPropagate) {
        winPtr->atts.do_not_propagate_mask
                = attsPtr->do_not_propagate_mask;
    }
    if (valueMask & CWColormap) {
        winPtr->atts.colormap = attsPtr->colormap;
    }
    if (valueMask & CWCursor) {
        winPtr->atts.cursor = attsPtr->cursor;
    }

    if (winPtr->window != None) {
        XChangeWindowAttributes(winPtr->display, winPtr->window,
                valueMask, attsPtr);
    } else {
        winPtr->dirtyAtts |= valueMask;
    }
}

void
Tk_SetWindowBackground(tkwin, pixel)
    Tk_Window tkwin;            /* Window to manipulate. */
    unsigned long pixel;        /* Pixel value to use for
                                 * window's background. */
{
    register TkWindow *winPtr = (TkWindow *) tkwin;

    winPtr->atts.background_pixel = pixel;

    if (winPtr->window != None) {
        XSetWindowBackground(winPtr->display, winPtr->window, pixel);
    } else {
        winPtr->dirtyAtts = (winPtr->dirtyAtts & (unsigned) ~CWBackPixmap)
                | CWBackPixel;
    }
}

void
Tk_SetWindowBackgroundPixmap(tkwin, pixmap)
    Tk_Window tkwin;            /* Window to manipulate. */
    Pixmap pixmap;              /* Pixmap to use for window's
                                 * background. */
{
    register TkWindow *winPtr = (TkWindow *) tkwin;

    winPtr->atts.background_pixmap = pixmap;

    if (winPtr->window != None) {
        XSetWindowBackgroundPixmap(winPtr->display,
                winPtr->window, pixmap);
    } else {
        winPtr->dirtyAtts = (winPtr->dirtyAtts & (unsigned) ~CWBackPixel)
                | CWBackPixmap;
    }
}

void
Tk_SetWindowBorder(tkwin, pixel)
    Tk_Window tkwin;            /* Window to manipulate. */
    unsigned long pixel;        /* Pixel value to use for
                                 * window's border. */
{
    register TkWindow *winPtr = (TkWindow *) tkwin;

    winPtr->atts.border_pixel = pixel;

    if (winPtr->window != None) {
        XSetWindowBorder(winPtr->display, winPtr->window, pixel);
    } else {
        winPtr->dirtyAtts = (winPtr->dirtyAtts & (unsigned) ~CWBorderPixmap)
                | CWBorderPixel;
    }
}

void
Tk_SetWindowBorderPixmap(tkwin, pixmap)
    Tk_Window tkwin;            /* Window to manipulate. */
    Pixmap pixmap;              /* Pixmap to use for window's
                                 * border. */
{
    register TkWindow *winPtr = (TkWindow *) tkwin;

    winPtr->atts.border_pixmap = pixmap;

    if (winPtr->window != None) {
        XSetWindowBorderPixmap(winPtr->display,
                winPtr->window, pixmap);
    } else {
        winPtr->dirtyAtts = (winPtr->dirtyAtts & (unsigned) ~CWBorderPixel)
                | CWBorderPixmap;
    }
}

void
Tk_DefineCursor(tkwin, cursor)
    Tk_Window tkwin;            /* Window to manipulate. */
    Tk_Cursor cursor;           /* Cursor to use for window (may be None). */
{
    register TkWindow *winPtr = (TkWindow *) tkwin;

#ifdef MAC_TCL
    winPtr->atts.cursor = (XCursor) cursor;
#else
    winPtr->atts.cursor = (Cursor) cursor;
#endif
    
    if (winPtr->window != None) {
        XDefineCursor(winPtr->display, winPtr->window, winPtr->atts.cursor);
    } else {
        winPtr->dirtyAtts = winPtr->dirtyAtts | CWCursor;
    }
}

void
Tk_UndefineCursor(tkwin)
    Tk_Window tkwin;            /* Window to manipulate. */
{
    Tk_DefineCursor(tkwin, None);
}

void
Tk_SetWindowColormap(tkwin, colormap)
    Tk_Window tkwin;            /* Window to manipulate. */
    Colormap colormap;          /* Colormap to use for window. */
{
    register TkWindow *winPtr = (TkWindow *) tkwin;

    winPtr->atts.colormap = colormap;

    if (winPtr->window != None) {
        XSetWindowColormap(winPtr->display, winPtr->window, colormap);
        if (!(winPtr->flags & TK_TOP_LEVEL)) {
            TkWmAddToColormapWindows(winPtr);
            winPtr->flags |= TK_WM_COLORMAP_WINDOW;
        }
    } else {
        winPtr->dirtyAtts |= CWColormap;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_SetWindowVisual --
 *
 *      This procedure is called to specify a visual to be used
 *      for a Tk window when it is created.  This procedure, if
 *      called at all, must be called before the X window is created
 *      (i.e. before Tk_MakeWindowExist is called).
 *
 * Results:
 *      The return value is 1 if successful, or 0 if the X window has
 *      been already created.
 *
 * Side effects:
 *      The information given is stored for when the window is created.
 *
 *----------------------------------------------------------------------
 */

int
Tk_SetWindowVisual(tkwin, visual, depth, colormap)
    Tk_Window tkwin;            /* Window to manipulate. */
    Visual *visual;             /* New visual for window. */
    int depth;                  /* New depth for window. */
    Colormap colormap;          /* An appropriate colormap for the visual. */
{
    register TkWindow *winPtr = (TkWindow *) tkwin;

    if( winPtr->window != None ){
        /* Too late! */
        return 0;
    }

    winPtr->visual = visual;
    winPtr->depth = depth;
    winPtr->atts.colormap = colormap;
    winPtr->dirtyAtts |= CWColormap;

    /*
     * The following code is needed to make sure that the window doesn't
     * inherit the parent's border pixmap, which would result in a BadMatch
     * error.
     */

    if (!(winPtr->dirtyAtts & CWBorderPixmap)) {
        winPtr->dirtyAtts |= CWBorderPixel;
    }
    return 1;
}

/*
 *----------------------------------------------------------------------
 *
 * TkDoConfigureNotify --
 *
 *      Generate a ConfigureNotify event describing the current
 *      configuration of a window.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      An event is generated and processed by Tk_HandleEvent.
 *
 *----------------------------------------------------------------------
 */

void
TkDoConfigureNotify(winPtr)
    register TkWindow *winPtr;          /* Window whose configuration
                                         * was just changed. */
{
    XEvent event;

    event.type = ConfigureNotify;
    event.xconfigure.serial = LastKnownRequestProcessed(winPtr->display);
    event.xconfigure.send_event = False;
    event.xconfigure.display = winPtr->display;
    event.xconfigure.event = winPtr->window;
    event.xconfigure.window = winPtr->window;
    event.xconfigure.x = winPtr->changes.x;
    event.xconfigure.y = winPtr->changes.y;
    event.xconfigure.width = winPtr->changes.width;
    event.xconfigure.height = winPtr->changes.height;
    event.xconfigure.border_width = winPtr->changes.border_width;
    if (winPtr->changes.stack_mode == Above) {
        event.xconfigure.above = winPtr->changes.sibling;
    } else {
        event.xconfigure.above = None;
    }
    event.xconfigure.override_redirect = winPtr->atts.override_redirect;
    Tk_HandleEvent(&event);
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_SetClass --
 *
 *      This procedure is used to give a window a class.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      A new class is stored for tkwin, replacing any existing
 *      class for it.
 *
 *----------------------------------------------------------------------
 */

void
Tk_SetClass(tkwin, className)
    Tk_Window tkwin;            /* Token for window to assign class. */
    char *className;            /* New class for tkwin. */
{
    register TkWindow *winPtr = (TkWindow *) tkwin;

    winPtr->classUid = Tk_GetUid(className);
    if (winPtr->flags & TK_TOP_LEVEL) {
        TkWmSetClass(winPtr);
    }
    TkOptionClassChanged(winPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TkSetClassProcs --
 *
 *      This procedure is used to set the class procedures and
 *      instance data for a window.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      A new set of class procedures and instance data is stored
 *      for tkwin, replacing any existing values.
 *
 *----------------------------------------------------------------------
 */

void
TkSetClassProcs(tkwin, procs, instanceData)
    Tk_Window tkwin;            /* Token for window to modify. */
    TkClassProcs *procs;        /* Class procs structure. */
    ClientData instanceData;    /* Data to be passed to class procedures. */
{
    register TkWindow *winPtr = (TkWindow *) tkwin;

    winPtr->classProcsPtr = procs;
    winPtr->instanceData = instanceData;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_NameToWindow --
 *
 *      Given a string name for a window, this procedure
 *      returns the token for the window, if there exists a
 *      window corresponding to the given name.
 *
 * Results:
 *      The return result is either a token for the window corresponding
 *      to "name", or else NULL to indicate that there is no such
 *      window.  In this case, an error message is left in the interp's result.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */

Tk_Window
Tk_NameToWindow(interp, pathName, tkwin)
    Tcl_Interp *interp;         /* Where to report errors. */
    char *pathName;             /* Path name of window. */
    Tk_Window tkwin;            /* Token for window:  name is assumed to
                                 * belong to the same main window as tkwin. */
{
    Tcl_HashEntry *hPtr;

    if (tkwin == NULL) {
        /*
         * Either we're not really in Tk, or the main window was destroyed and
         * we're on our way out of the application
         */
        Tcl_AppendResult(interp, "NULL main window", (char *)NULL);
        return NULL;
    }
    
    hPtr = Tcl_FindHashEntry(&((TkWindow *) tkwin)->mainPtr->nameTable,
            pathName);
    if (hPtr == NULL) {
        Tcl_AppendResult(interp, "bad window path name \"",
                pathName, "\"", (char *) NULL);
        return NULL;
    }
    return (Tk_Window) Tcl_GetHashValue(hPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_IdToWindow --
 *
 *      Given an X display and window ID, this procedure returns the
 *      Tk token for the window, if there exists a Tk window corresponding
 *      to the given ID.
 *
 * Results:
 *      The return result is either a token for the window corresponding
 *      to the given X id, or else NULL to indicate that there is no such
 *      window.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */

Tk_Window
Tk_IdToWindow(display, window)
    Display *display;           /* X display containing the window. */
    Window window;              /* X window window id. */
{
    TkDisplay *dispPtr;
    Tcl_HashEntry *hPtr;

    for (dispPtr = TkGetDisplayList(); ; dispPtr = dispPtr->nextPtr) {
        if (dispPtr == NULL) {
            return NULL;
        }
        if (dispPtr->display == display) {
            break;
        }
    }

    hPtr = Tcl_FindHashEntry(&dispPtr->winTable, (char *) window);
    if (hPtr == NULL) {
        return NULL;
    }
    return (Tk_Window) Tcl_GetHashValue(hPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_DisplayName --
 *
 *      Return the textual name of a window's display.
 *
 * Results:
 *      The return value is the string name of the display associated
 *      with tkwin.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */

char *
Tk_DisplayName(tkwin)
    Tk_Window tkwin;            /* Window whose display name is desired. */
{
    return ((TkWindow *) tkwin)->dispPtr->name;
}

/*
 *----------------------------------------------------------------------
 *
 * UnlinkWindow --
 *
 *      This procedure removes a window from the childList of its
 *      parent.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The window is unlinked from its childList.
 *
 *----------------------------------------------------------------------
 */

static void
UnlinkWindow(winPtr)
    TkWindow *winPtr;                   /* Child window to be unlinked. */
{
    TkWindow *prevPtr;

    if (winPtr->parentPtr == NULL) {
        return;
    }
    prevPtr = winPtr->parentPtr->childList;
    if (prevPtr == winPtr) {
        winPtr->parentPtr->childList = winPtr->nextPtr;
        if (winPtr->nextPtr == NULL) {
            winPtr->parentPtr->lastChildPtr = NULL;
        }
    } else {
        while (prevPtr->nextPtr != winPtr) {
            prevPtr = prevPtr->nextPtr;
            if (prevPtr == NULL) {
                panic("UnlinkWindow couldn't find child in parent");
            }
        }
        prevPtr->nextPtr = winPtr->nextPtr;
        if (winPtr->nextPtr == NULL) {
            winPtr->parentPtr->lastChildPtr = prevPtr;
        }
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_RestackWindow --
 *
 *      Change a window's position in the stacking order.
 *
 * Results:
 *      TCL_OK is normally returned.  If other is not a descendant
 *      of tkwin's parent then TCL_ERROR is returned and tkwin is
 *      not repositioned.
 *
 * Side effects:
 *      Tkwin is repositioned in the stacking order.
 *
 *----------------------------------------------------------------------
 */

int
Tk_RestackWindow(tkwin, aboveBelow, other)
    Tk_Window tkwin;            /* Token for window whose position in
                                 * the stacking order is to change. */
    int aboveBelow;             /* Indicates new position of tkwin relative
                                 * to other;  must be Above or Below. */
    Tk_Window other;            /* Tkwin will be moved to a position that
                                 * puts it just above or below this window.
                                 * If NULL then tkwin goes above or below
                                 * all windows in the same parent. */
{
    TkWindow *winPtr = (TkWindow *) tkwin;
    TkWindow *otherPtr = (TkWindow *) other;

    /*
     * Special case:  if winPtr is a top-level window then just find
     * the top-level ancestor of otherPtr and restack winPtr above
     * otherPtr without changing any of Tk's childLists.
     */

    if (winPtr->flags & TK_TOP_LEVEL) {
        while ((otherPtr != NULL) && !(otherPtr->flags & TK_TOP_LEVEL)) {
            otherPtr = otherPtr->parentPtr;
        }
        TkWmRestackToplevel(winPtr, aboveBelow, otherPtr);
        return TCL_OK;
    }

    /*
     * Find an ancestor of otherPtr that is a sibling of winPtr.
     */

    if (winPtr->parentPtr == NULL) {
        /*
         * Window is going to be deleted shortly;  don't do anything.
         */

        return TCL_OK;
    }
    if (otherPtr == NULL) {
        if (aboveBelow == Above) {
            otherPtr = winPtr->parentPtr->lastChildPtr;
        } else {
            otherPtr = winPtr->parentPtr->childList;
        }
    } else {
        while (winPtr->parentPtr != otherPtr->parentPtr) {
            if ((otherPtr == NULL) || (otherPtr->flags & TK_TOP_LEVEL)) {
                return TCL_ERROR;
            }
            otherPtr = otherPtr->parentPtr;
        }
    }
    if (otherPtr == winPtr) {
        return TCL_OK;
    }

    /*
     * Reposition winPtr in the stacking order.
     */

    UnlinkWindow(winPtr);
    if (aboveBelow == Above) {
        winPtr->nextPtr = otherPtr->nextPtr;
        if (winPtr->nextPtr == NULL) {
            winPtr->parentPtr->lastChildPtr = winPtr;
        }
        otherPtr->nextPtr = winPtr;
    } else {
        TkWindow *prevPtr;

        prevPtr = winPtr->parentPtr->childList;
        if (prevPtr == otherPtr) {
            winPtr->parentPtr->childList = winPtr;
        } else {
            while (prevPtr->nextPtr != otherPtr) {
                prevPtr = prevPtr->nextPtr;
            }
            prevPtr->nextPtr = winPtr;
        }
        winPtr->nextPtr = otherPtr;
    }

    /*
     * Notify the X server of the change.  If winPtr hasn't yet been
     * created then there's no need to tell the X server now, since
     * the stacking order will be handled properly when the window
     * is finally created.
     */

    if (winPtr->window != None) {
        XWindowChanges changes;
        unsigned int mask;

        mask = CWStackMode;
        changes.stack_mode = Above;
        for (otherPtr = winPtr->nextPtr; otherPtr != NULL;
                otherPtr = otherPtr->nextPtr) {
            if ((otherPtr->window != None)
                    && !(otherPtr->flags & (TK_TOP_LEVEL|TK_REPARENTED))){
                changes.sibling = otherPtr->window;
                changes.stack_mode = Below;
                mask = CWStackMode|CWSibling;
                break;
            }
        }
        XConfigureWindow(winPtr->display, winPtr->window, mask, &changes);
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_MainWindow --
 *
 *      Returns the main window for an application.
 *
 * Results:
 *      If interp has a Tk application associated with it, the main
 *      window for the application is returned.  Otherwise NULL is
 *      returned and an error message is left in the interp's result.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */

Tk_Window
Tk_MainWindow(interp)
    Tcl_Interp *interp;                 /* Interpreter that embodies the
                                         * application.  Used for error
                                         * reporting also. */
{
    TkMainInfo *mainPtr;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    for (mainPtr = tsdPtr->mainWindowList; mainPtr != NULL;
            mainPtr = mainPtr->nextPtr) {
        if (mainPtr->interp == interp) {
            return (Tk_Window) mainPtr->winPtr;
        }
    }
    Tcl_SetResult(interp, "this isn't a Tk application", TCL_STATIC);
    return NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_StrictMotif --
 *
 *      Indicates whether strict Motif compliance has been specified
 *      for the given window.
 *
 * Results:
 *      The return value is 1 if strict Motif compliance has been
 *      requested for tkwin's application by setting the tk_strictMotif
 *      variable in its interpreter to a true value.  0 is returned
 *      if tk_strictMotif has a false value.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */

int
Tk_StrictMotif(tkwin)
    Tk_Window tkwin;                    /* Window whose application is
                                         * to be checked. */
{
    return ((TkWindow *) tkwin)->mainPtr->strictMotif;
}

/* 
 *--------------------------------------------------------------
 *
 * OpenIM --
 *
 *      Tries to open an X input method, associated with the
 *      given display.  Right now we can only deal with a bare-bones
 *      input style:  no preedit, and no status.
 *
 * Results:
 *      Stores the input method in dispPtr->inputMethod;  if there isn't
 *      a suitable input method, then NULL is stored in dispPtr->inputMethod.
 *
 * Side effects:
 *      An input method gets opened.
 *
 *--------------------------------------------------------------
 */

static void
OpenIM(dispPtr)
    TkDisplay *dispPtr;         /* Tk's structure for the display. */
{
#ifndef TK_USE_INPUT_METHODS
    return;
#else
    unsigned short i;
    XIMStyles *stylePtr;

    dispPtr->inputMethod = XOpenIM(dispPtr->display, NULL, NULL, NULL);
    if (dispPtr->inputMethod == NULL) {
        return;
    }

    if ((XGetIMValues(dispPtr->inputMethod, XNQueryInputStyle, &stylePtr,
            NULL) != NULL) || (stylePtr == NULL)) {
        goto error;
    }
    for (i = 0; i < stylePtr->count_styles; i++) {
        if (stylePtr->supported_styles[i]
                == (XIMPreeditNothing|XIMStatusNothing)) {
            XFree(stylePtr);
            return;
        }
    }
    XFree(stylePtr);

    error:

    /*
     * Should close the input method, but this causes core dumps on some
     * systems (e.g. Solaris 2.3 as of 1/6/95).
     * XCloseIM(dispPtr->inputMethod);
     */
    dispPtr->inputMethod = NULL;
    return;
#endif /* TK_USE_INPUT_METHODS */
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_GetNumMainWindows --
 *
 *      This procedure returns the number of main windows currently
 *      open in this process.
 *
 * Results:
 *      The number of main windows open in this process.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */

int
Tk_GetNumMainWindows()
{
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    return tsdPtr->numMainWindows;
}

/*
 *----------------------------------------------------------------------
 *
 * DeleteWindowsExitProc --
 *
 *      This procedure is invoked as an exit handler.  It deletes all
 *      of the main windows in the process.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */

static void
DeleteWindowsExitProc(clientData)
    ClientData clientData;              /* Not used. */
{
    TkDisplay *displayPtr, *nextPtr;
    Tcl_Interp *interp;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
    
    while (tsdPtr->mainWindowList != NULL) {
        /*
         * We must protect the interpreter while deleting the window,
         * because of <Destroy> bindings which could destroy the interpreter
         * while the window is being deleted. This would leave frames on
         * the call stack pointing at deleted memory, causing core dumps.
         */
        
        interp = tsdPtr->mainWindowList->winPtr->mainPtr->interp;
        Tcl_Preserve((ClientData) interp);
        Tk_DestroyWindow((Tk_Window) tsdPtr->mainWindowList->winPtr);
        Tcl_Release((ClientData) interp);
    }
    
    displayPtr = tsdPtr->displayList;
    tsdPtr->displayList = NULL;
    
    /*
     * Iterate destroying the displays until no more displays remain.
     * It is possible for displays to get recreated during exit by any
     * code that calls GetScreen, so we must destroy these new displays
     * as well as the old ones.
     */
    
    for (displayPtr = tsdPtr->displayList;
         displayPtr != NULL;
         displayPtr = tsdPtr->displayList) {

        /*
         * Now iterate over the current list of open displays, and first
         * set the global pointer to NULL so we will be able to notice if
         * any new displays got created during deletion of the current set.
         * We must also do this to ensure that Tk_IdToWindow does not find
         * the old display as it is being destroyed, when it wants to see
         * if it needs to dispatch a message.
         */
        
        for (tsdPtr->displayList = NULL; displayPtr != NULL; 
                displayPtr = nextPtr) {
            nextPtr = displayPtr->nextPtr;
            if (displayPtr->name != (char *) NULL) {
                ckfree(displayPtr->name);
            }
            Tcl_DeleteHashTable(&(displayPtr->winTable));
            TkpCloseDisplay(displayPtr);
        }
    }
    
    tsdPtr->numMainWindows = 0;
    tsdPtr->mainWindowList = NULL;
    tsdPtr->initialized = 0;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_Init --
 *
 *      This procedure is invoked to add Tk to an interpreter.  It
 *      incorporates all of Tk's commands into the interpreter and
 *      creates the main window for a new Tk application.  If the
 *      interpreter contains a variable "argv", this procedure
 *      extracts several arguments from that variable, uses them
 *      to configure the main window, and modifies argv to exclude
 *      the arguments (see the "wish" documentation for a list of
 *      the arguments that are extracted).
 *
 * Results:
 *      Returns a standard Tcl completion code and sets the interp's result
 *      if there is an error.
 *
 * Side effects:
 *      Depends on various initialization scripts that get invoked.
 *
 *----------------------------------------------------------------------
 */

int
Tk_Init(interp)
    Tcl_Interp *interp;         /* Interpreter to initialize. */
{
    return Initialize(interp);
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_SafeInit --
 *
 *      This procedure is invoked to add Tk to a safe interpreter. It
 *      invokes the internal procedure that does the real work.
 *
 * Results:
 *      Returns a standard Tcl completion code and sets the interp's result
 *      if there is an error.
 *
 * Side effects:
 *      Depends on various initialization scripts that are invoked.
 *
 *----------------------------------------------------------------------
 */

int
Tk_SafeInit(interp)
    Tcl_Interp *interp;         /* Interpreter to initialize. */
{
    /*
     * Initialize the interpreter with Tk, safely. This removes
     * all the Tk commands that are unsafe.
     *
     * Rationale:
     *
     * - Toplevel and menu are unsafe because they can be used to cover
     *   the entire screen and to steal input from the user.
     * - Continuous ringing of the bell is a nuisance.
     * - Cannot allow access to the clipboard because a malicious script
     *   can replace the contents with the string "rm -r *" and lead to
     *   surprises when the contents of the clipboard are pasted. We do
     *   not currently hide the selection command.. Should we?
     * - Cannot allow send because it can be used to cause unsafe
     *   interpreters to execute commands. The tk command recreates the
     *   send command, so that too must be hidden.
     * - Focus can be used to grab the focus away from another window,
     *   in effect stealing user input. Cannot allow that.
     *   NOTE: We currently do *not* hide focus as it would make it
     *   impossible to provide keyboard input to Tk in a safe interpreter.
     * - Grab can be used to block the user from using any other apps
     *   on the screen.
     * - Tkwait can block the containing process forever. Use bindings,
     *   fileevents and split the protocol into before-the-wait and
     *   after-the-wait parts. More work but necessary.
     * - Wm is unsafe because (if toplevels are allowed, in the future)
     *   it can be used to remove decorations, move windows around, cover
     *   the entire screen etc etc.
     *
     * Current risks:
     *
     * - No CPU time limit, no memory allocation limits, no color limits.
     *
     *  The actual code called is the same as Tk_Init but Tcl_IsSafe()
     *  is checked at several places to differentiate the two initialisations.
     */

    return Initialize(interp);
}


extern TkStubs tkStubs;

/*
 *----------------------------------------------------------------------
 *
 * Initialize --
 *
 *
 * Results:
 *      A standard Tcl result. Also leaves an error message in the interp's
 *      result if there was an error.
 *
 * Side effects:
 *      Depends on the initialization scripts that are invoked.
 *
 *----------------------------------------------------------------------
 */

static int
Initialize(interp)
    Tcl_Interp *interp;         /* Interpreter to initialize. */
{
    char *p;
    int argc, code;
    char **argv, *args[20];
    Tcl_DString class;
    ThreadSpecificData *tsdPtr;
    
    /*
     * Ensure that we are getting the matching version of Tcl.  This is
     * really only an issue when Tk is loaded dynamically.
     */

    if (Tcl_InitStubs(interp, TCL_VERSION, 1) == NULL) {
        return TCL_ERROR;
    }

    tsdPtr = (ThreadSpecificData *) 
        Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    /*
     * Start by initializing all the static variables to default acceptable
     * values so that no information is leaked from a previous run of this
     * code.
     */

    Tcl_MutexLock(&windowMutex);
    synchronize = 0;
    name = NULL;
    display = NULL;
    geometry = NULL;
    colormap = NULL;
    use = NULL;
    visual = NULL;
    rest = 0;

    /*
     * We start by resetting the result because it might not be clean
     */
    Tcl_ResetResult(interp);

    if (Tcl_IsSafe(interp)) {
        /*
         * Get the clearance to start Tk and the "argv" parameters
         * from the master.
         */
        Tcl_DString ds;
        
        /*
         * Step 1 : find the master and construct the interp name
         * (could be a function if new APIs were ok).
         * We could also construct the path while walking, but there
         * is no API to get the name of an interp either.
         */
        Tcl_Interp *master = interp;

        while (1) {
            master = Tcl_GetMaster(master);
            if (master == NULL) {
                Tcl_DStringFree(&ds);
                Tcl_AppendResult(interp, "NULL master", (char *) NULL);
                Tcl_MutexUnlock(&windowMutex);
                return TCL_ERROR;
            }
            if (!Tcl_IsSafe(master)) {
                /* Found the trusted master. */
                break;
            }
        }
        /*
         * Construct the name (rewalk...)
         */
        if (Tcl_GetInterpPath(master, interp) != TCL_OK) {
            Tcl_AppendResult(interp, "error in Tcl_GetInterpPath",
                    (char *) NULL);
            Tcl_MutexUnlock(&windowMutex);
            return TCL_ERROR;
        }
        /*
         * Build the string to eval.
         */
        Tcl_DStringInit(&ds);
        Tcl_DStringAppendElement(&ds, "::safe::TkInit");
        Tcl_DStringAppendElement(&ds, Tcl_GetStringResult(master));
        
        /*
         * Step 2 : Eval in the master. The argument is the *reversed*
         * interp path of the slave.
         */
        
        if (Tcl_Eval(master, Tcl_DStringValue(&ds)) != TCL_OK) {
            /*
             * We might want to transfer the error message or not.
             * We don't. (no API to do it and maybe security reasons).
             */
            Tcl_DStringFree(&ds);
            Tcl_AppendResult(interp, 
                    "not allowed to start Tk by master's safe::TkInit",
                    (char *) NULL);
            Tcl_MutexUnlock(&windowMutex);
            return TCL_ERROR;
        }
        Tcl_DStringFree(&ds);
        /* 
         * Use the master's result as argv.
         * Note: We don't use the Obj interfaces to avoid dealing with
         * cross interp refcounting and changing the code below.
         */

        p = Tcl_GetStringResult(master);
    } else {
        /*
         * If there is an "argv" variable, get its value, extract out
         * relevant arguments from it, and rewrite the variable without
         * the arguments that we used.
         */

        p = Tcl_GetVar2(interp, "argv", (char *) NULL, TCL_GLOBAL_ONLY);
    }
    argv = NULL;
    if (p != NULL) {
        char buffer[TCL_INTEGER_SPACE];

        if (Tcl_SplitList(interp, p, &argc, &argv) != TCL_OK) {
            argError:
            Tcl_AddErrorInfo(interp,
                    "\n    (processing arguments in argv variable)");
            Tcl_MutexUnlock(&windowMutex);
            return TCL_ERROR;
        }
        if (Tk_ParseArgv(interp, (Tk_Window) NULL, &argc, argv,
                argTable, TK_ARGV_DONT_SKIP_FIRST_ARG|TK_ARGV_NO_DEFAULTS)
                != TCL_OK) {
            ckfree((char *) argv);
            goto argError;
        }
        p = Tcl_Merge(argc, argv);
        Tcl_SetVar2(interp, "argv", (char *) NULL, p, TCL_GLOBAL_ONLY);
        sprintf(buffer, "%d", argc);
        Tcl_SetVar2(interp, "argc", (char *) NULL, buffer, TCL_GLOBAL_ONLY);
        ckfree(p);
    }

    /*
     * Figure out the application's name and class.
     */

    Tcl_DStringInit(&class);
    if (name == NULL) {
        int offset;
        TkpGetAppName(interp, &class);
        offset = Tcl_DStringLength(&class)+1;
        Tcl_DStringSetLength(&class, offset);
        Tcl_DStringAppend(&class, Tcl_DStringValue(&class), offset-1);
        name = Tcl_DStringValue(&class) + offset;
    } else {
        Tcl_DStringAppend(&class, name, -1);
    }

    p = Tcl_DStringValue(&class);
    if (*p) {
        Tcl_UtfToTitle(p);
    }

    /*
     * Create an argument list for creating the top-level window,
     * using the information parsed from argv, if any.
     */

    args[0] = "toplevel";
    args[1] = ".";
    args[2] = "-class";
    args[3] = Tcl_DStringValue(&class);
    argc = 4;
    if (display != NULL) {
        args[argc] = "-screen";
        args[argc+1] = display;
        argc += 2;

        /*
         * If this is the first application for this process, save
         * the display name in the DISPLAY environment variable so
         * that it will be available to subprocesses created by us.
         */

        if (tsdPtr->numMainWindows == 0) {
            Tcl_SetVar2(interp, "env", "DISPLAY", display, TCL_GLOBAL_ONLY);
        }
    }
    if (colormap != NULL) {
        args[argc] = "-colormap";
        args[argc+1] = colormap;
        argc += 2;
        colormap = NULL;
    }
    if (use != NULL) {
        args[argc] = "-use";
        args[argc+1] = use;
        argc += 2;
        use = NULL;
    }
    if (visual != NULL) {
        args[argc] = "-visual";
        args[argc+1] = visual;
        argc += 2;
        visual = NULL;
    }
    args[argc] = NULL;
    code = TkCreateFrame((ClientData) NULL, interp, argc, args, 1, name);

    Tcl_DStringFree(&class);
    if (code != TCL_OK) {
        goto done;
    }
    Tcl_ResetResult(interp);
    if (synchronize) {
        XSynchronize(Tk_Display(Tk_MainWindow(interp)), True);
    }

    /*
     * Set the geometry of the main window, if requested.  Put the
     * requested geometry into the "geometry" variable.
     */

    if (geometry != NULL) {
        Tcl_SetVar(interp, "geometry", geometry, TCL_GLOBAL_ONLY);
        code = Tcl_VarEval(interp, "wm geometry . ", geometry, (char *) NULL);
        if (code != TCL_OK) {
            goto done;
        }
        geometry = NULL;
    }
    Tcl_MutexUnlock(&windowMutex);

    if (Tcl_PkgRequire(interp, "Tcl", TCL_VERSION, 1) == NULL) {
        code = TCL_ERROR;
        goto done;
    }

    /*
     * Provide Tk and its stub table.
     */

    code = Tcl_PkgProvideEx(interp, "Tk", TK_VERSION, (ClientData) &tkStubs);
    if (code != TCL_OK) {
        goto done;
    }

#ifdef Tk_InitStubs
#undef Tk_InitStubs
#endif

    Tk_InitStubs(interp, TK_VERSION, 1);

    /*
     * Invoke platform-specific initialization.
     */

    code = TkpInit(interp);

    done:
    if (argv != NULL) {
        ckfree((char *) argv);
    }
    return code;
}

/* End of tkwindow.c */