/***********************************************************
Copyright (c) 1993, Oracle and/or its affiliates. All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice (including the next
paragraph) shall be included in all copies or substantial portions of the
Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the name of Digital not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

******************************************************************/

/*

Copyright 1987, 1988, 1994, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.

*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "IntrinsicI.h"

struct _DestroyRec {
    int dispatch_level;
    Widget widget;
};

static void
Recursive(Widget widget, XtWidgetProc proc)
{
    register Cardinal i;

    /* Recurse down normal children */
    if (XtIsComposite(widget)) {
        CompositePart *cwp = &(((CompositeWidget) widget)->composite);

        for (i = 0; i < cwp->num_children; i++) {
            Recursive(cwp->children[i], proc);
        }
    }

    /* Recurse down popup children */
    if (XtIsWidget(widget)) {
        for (i = 0; i < widget->core.num_popups; i++) {
            Recursive(widget->core.popup_list[i], proc);
        }
    }

    /* Finally, apply procedure to this widget */
    (*proc) (widget);
}                               /* Recursive */

static void
Phase1Destroy(Widget widget)
{
    Widget hookobj = XtHooksOfDisplay(XtDisplayOfObject(widget));

    widget->core.being_destroyed = TRUE;
    if (XtHasCallbacks(hookobj, XtNdestroyHook) == XtCallbackHasSome) {
        XtDestroyHookDataRec call_data;

        call_data.type = XtHdestroy;
        call_data.widget = widget;
        XtCallCallbackList(hookobj,
                           ((HookObject) hookobj)->hooks.destroyhook_callbacks,
                           (XtPointer) &call_data);
    }
}                               /* Phase1Destroy */

static void
Phase2Callbacks(Widget widget)
{
    if (widget->core.destroy_callbacks != NULL) {
        XtCallCallbackList(widget,
                           widget->core.destroy_callbacks, (XtPointer) NULL);
    }
}                               /* Phase2Callbacks */

static void
Phase2Destroy(register Widget widget)
{
    register WidgetClass class;
    register ConstraintWidgetClass cwClass;
    ObjectClassExtension ext;

    /* Call constraint destroy procedures */
    if (XtParent(widget) != NULL && !XtIsShell(widget) &&
        XtIsConstraint(XtParent(widget))) {
        LOCK_PROCESS;
        cwClass = (ConstraintWidgetClass) XtParent(widget)->core.widget_class;
        UNLOCK_PROCESS;
        for (;;) {
            XtWidgetProc destroy;

            LOCK_PROCESS;
            destroy = cwClass->constraint_class.destroy;
            UNLOCK_PROCESS;
            if (destroy)
                (*destroy) (widget);
            if (cwClass == (ConstraintWidgetClass) constraintWidgetClass)
                break;
            LOCK_PROCESS;
            cwClass = (ConstraintWidgetClass) cwClass->core_class.superclass;
            UNLOCK_PROCESS;
        }
    }

    /* Call widget destroy procedures */
    LOCK_PROCESS;
    for (class = widget->core.widget_class;
         class != NULL; class = class->core_class.superclass) {
        XtWidgetProc destroy;

        destroy = class->core_class.destroy;
        UNLOCK_PROCESS;
        if (destroy)
            (*destroy) (widget);
        LOCK_PROCESS;
    }

    /* Call widget deallocate procedure */
    ext = (ObjectClassExtension) XtGetClassExtension(widget->core.widget_class,
                                                     XtOffsetOf(CoreClassPart,
                                                                extension),
                                                     NULLQUARK,
                                                     XtObjectExtensionVersion,
                                                     sizeof
                                                     (ObjectClassExtensionRec));
    if (ext && ext->deallocate) {
        XtDeallocateProc deallocate;

        deallocate = ext->deallocate;
        UNLOCK_PROCESS;
        (*deallocate) (widget, NULL);
    }
    else {
        UNLOCK_PROCESS;
        XtFree((char *) widget);
    }
}                               /* Phase2Destroy */

static Boolean
IsDescendant(Widget widget, const Widget root)
{
    while (widget != NULL && (widget = XtParent(widget)) != root) {
        ;
    }
    return (widget != NULL) ? True : False;
}

static void
XtPhase2Destroy(Widget widget)
{
    Display *display = NULL;
    Window window;
    Widget parent;
    XtAppContext app = XtWidgetToApplicationContext(widget);
    Widget outerInPhase2Destroy = app->in_phase2_destroy;
    int starting_count = app->destroy_count;
    Boolean isPopup = False;

    /* invalidate focus trace cache for this display */
    _XtGetPerDisplay(XtDisplayOfObject(widget))->pdi.traceDepth = 0;

    parent = widget->core.parent;

    if (parent && XtIsWidget(parent) && parent->core.num_popups) {
        Cardinal i;

        for (i = 0; i < parent->core.num_popups; i++) {
            if (parent->core.popup_list[i] == widget) {
                isPopup = True;
                break;
            }
        }
    }

    if (!isPopup && parent && XtIsComposite(parent)) {
        XtWidgetProc delete_child;

        LOCK_PROCESS;
        delete_child =
            ((CompositeWidgetClass) parent->core.widget_class)->composite_class.
            delete_child;
        UNLOCK_PROCESS;
        if (XtIsRectObj(widget)) {
            XtUnmanageChild(widget);
        }
        if (delete_child == NULL) {
            String param;
            Cardinal num_params = 1;

            LOCK_PROCESS;
            param = parent->core.widget_class->core_class.class_name;
            UNLOCK_PROCESS;
            XtAppWarningMsg(XtWidgetToApplicationContext(widget),
                            "invalidProcedure", "deleteChild",
                            XtCXtToolkitError,
                            "null delete_child procedure for class %s in XtDestroy",
                            &param, &num_params);
        }
        else {
            (*delete_child) (widget);
        }
    }

    /* widget is freed in Phase2Destroy, so retrieve window now.
     * Shells destroy their own windows, to prevent window leaks in
     * popups; this test is practical only when XtIsShell() is cheap.
     */
    if (XtIsShell(widget) || !XtIsWidget(widget)) {
        window = 0;
    }
    else {
        display = XtDisplay(widget);

        window = widget->core.window;
    }

    Recursive(widget, Phase2Callbacks);
    if (app->destroy_count > starting_count) {
        int i = starting_count;

        while (i < app->destroy_count) {

            DestroyRec *dr = app->destroy_list + i;

            if (IsDescendant(dr->widget, widget)) {
                Widget descendant = dr->widget;
                register int j;

                app->destroy_count--;
                for (j = app->destroy_count - i; --j >= 0; dr++)
                    *dr = *(dr + 1);
                XtPhase2Destroy(descendant);
            }
            else
                i++;
        }
    }

    app->in_phase2_destroy = widget;
    Recursive(widget, Phase2Destroy);
    app->in_phase2_destroy = outerInPhase2Destroy;

    if (isPopup) {
        Cardinal i;

        for (i = 0; i < parent->core.num_popups; i++)
            if (parent->core.popup_list[i] == widget) {
                parent->core.num_popups--;
                while (i < parent->core.num_popups) {
                    parent->core.popup_list[i] = parent->core.popup_list[i + 1];
                    i++;
                }
                break;
            }
    }

    /* %%% the following parent test hides a more serious problem,
       but it avoids breaking those who depended on the old bug
       until we have time to fix it properly. */

    if (window && (parent == NULL || !parent->core.being_destroyed))
        XDestroyWindow(display, window);
}                               /* XtPhase2Destroy */

void
_XtDoPhase2Destroy(XtAppContext app, int dispatch_level)
{
    /* Phase 2 must occur in fifo order.  List is not necessarily
     * contiguous in dispatch_level.
     */

    int i = 0;

    while (i < app->destroy_count) {

        /* XtPhase2Destroy can result in calls to XtDestroyWidget,
         * and these could cause app->destroy_list to be reallocated.
         */

        DestroyRec *dr = app->destroy_list + i;

        if (dr->dispatch_level >= dispatch_level) {
            Widget w = dr->widget;
            register int j;

            app->destroy_count--;
            for (j = app->destroy_count - i; --j >= 0; dr++)
                *dr = *(dr + 1);
            XtPhase2Destroy(w);
        }
        else
            i++;
    }
}

void
XtDestroyWidget(Widget widget)
{
    XtAppContext app;
    DestroyRec *dr;

    app = XtWidgetToApplicationContext(widget);
    LOCK_APP(app);
    if (widget->core.being_destroyed) {
        UNLOCK_APP(app);
        return;
    }
    Recursive(widget, Phase1Destroy);

    if (app->in_phase2_destroy && IsDescendant(widget, app->in_phase2_destroy)) {
        XtPhase2Destroy(widget);
        UNLOCK_APP(app);
        return;
    }

    if (app->destroy_count == app->destroy_list_size) {
        app->destroy_list_size += 10;
        app->destroy_list = (DestroyRec *)
            XtRealloc((char *) app->destroy_list,
                      (Cardinal) (sizeof(DestroyRec) *
                                  (size_t) app->destroy_list_size)
            );
    }
    dr = app->destroy_list + app->destroy_count++;
    dr->dispatch_level = app->dispatch_level;
    dr->widget = widget;

    if (app->dispatch_level > 1) {
        int i;

        for (i = app->destroy_count - 1; i;) {
            /* this handles only one case of nesting difficulties */
            dr = app->destroy_list + (--i);
            if (dr->dispatch_level < app->dispatch_level &&
                IsDescendant(dr->widget, widget)) {
                DestroyRec *dr2 = app->destroy_list + (app->destroy_count - 1);

                dr2->dispatch_level = dr->dispatch_level;
                break;
            }
        }
    }

    if (_XtSafeToDestroy(app)) {
        app->dispatch_level = 1;        /* avoid nested _XtDoPhase2Destroy */
        _XtDoPhase2Destroy(app, 0);
        app->dispatch_level = 0;
    }
    UNLOCK_APP(app);

}                               /* XtDestroyWidget */