dist/src/Destroy.c

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

                        All Rights Reserved

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/*

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, Widget root)
{
    while ((widget = XtParent(widget)) != root) {
	if (widget == NULL) return False;
    }
    return True;
}

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 */