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re-use input window, prevent destryoing it

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we cannot fix Qt DnD crashing on client destruction (eg. also occurs with toolptips)
but we can prevent it to happen with effects by just un/mapping the input window instead
of destroying and re-creating it

BUG: 179077
FIXED-IN: 4.10
REVIEW: 105339
This commit is contained in:
Thomas Lübking 2012-06-24 11:13:33 +02:00
parent 9390b270f8
commit 6c4ef3ef35
1 changed files with 49 additions and 18 deletions
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45
effects.cpp
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@ -962,23 +962,52 @@ QRect EffectsHandlerImpl::clientArea(clientAreaOption opt, const QPoint& p, int
Window EffectsHandlerImpl::createInputWindow(Effect* e, int x, int y, int w, int h, const QCursor& cursor)
{
Window win = 0;
QList<InputWindowPair>::iterator it = input_windows.begin();
while (it != input_windows.end()) {
if (it->first != e) {
++it;
continue;
}
XWindowAttributes attr;
if (!XGetWindowAttributes(display(), it->second, &attr)) {
// this is some random junk that certainly should no be here
kDebug(1212) << "found input window that is NOT on the server, something is VERY broken here";
Q_ASSERT(false); // exit in debug mode - for releases we'll be a bit more graceful
it = input_windows.erase(it);
continue;
}
if (attr.x == x && attr.y == y && attr.width == w && attr.height == h) {
win = it->second; // re-use
break;
} else if (attr.map_state == IsUnmapped) {
// probably old one, likely no longer of interest
XDestroyWindow(display(), it->second);
it = input_windows.erase(it);
continue;
}
++it;
}
if (!win) {
XSetWindowAttributes attrs;
attrs.override_redirect = True;
Window win = XCreateWindow(display(), rootWindow(), x, y, w, h, 0, 0, InputOnly, CopyFromParent,
win = XCreateWindow(display(), rootWindow(), x, y, w, h, 0, 0, InputOnly, CopyFromParent,
CWOverrideRedirect, &attrs);
// TODO keeping on top?
// TODO enter/leave notify?
XSelectInput(display(), win, ButtonPressMask | ButtonReleaseMask | PointerMotionMask);
XDefineCursor(display(), win, cursor.handle());
XMapWindow(display(), win);
input_windows.append(qMakePair(e, win));
}
XMapRaised(display(), win);
// Raise electric border windows above the input windows
// so they can still be triggered.
#ifdef KWIN_BUILD_SCREENEDGES
Workspace::self()->screenEdge()->ensureOnTop();
#endif
if (input_windows.count() > 10) // that sounds like some leak - could still be correct, thoug - so NO ABORT HERE!
kDebug() << "** warning ** there are now " << input_windows.count() <<
"input windows what's a bit much - please have a look and if this counts up, better report a bug";
return win;
}
@ -986,8 +1015,7 @@ void EffectsHandlerImpl::destroyInputWindow(Window w)
{
foreach (const InputWindowPair & pos, input_windows) {
if (pos.second == w) {
input_windows.removeAll(pos);
XDestroyWindow(display(), w);
XUnmapWindow(display(), w);
#ifdef KWIN_BUILD_SCREENEDGES
Workspace::self()->screenEdge()->raisePanelProxies();
#endif
@ -1044,8 +1072,11 @@ void EffectsHandlerImpl::checkInputWindowStacking()
return;
Window* wins = new Window[input_windows.count()];
int pos = 0;
foreach (const InputWindowPair & it, input_windows)
foreach (const InputWindowPair &it, input_windows) {
XWindowAttributes attr;
if (XGetWindowAttributes(display(), it.second, &attr) && attr.map_state != IsUnmapped)
wins[pos++] = it.second;
}
XRaiseWindow(display(), wins[0]);
XRestackWindows(display(), wins, pos);
delete[] wins;