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Fix a crash when calling effectiveWinId() on parentless widgets.

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Remove the assert as it also triggers when the widget is one
that currently has no parent (setParent(0)).
Check that the WinId is != 0 in the cursor code.

Change-Id: I711fc600f1d803c8f01c15df87984e742a4c23d2
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@digia.com>
Reviewed-by: Girish Ramakrishnan <girish.1.ramakrishnan@nokia.com>
This commit is contained in:
Friedemann Kleint 2012-06-07 12:37:10 +02:00 committed by Qt by Nokia
parent 21e0d16411
commit 94a81928ac
2 changed files with 9 additions and 23 deletions
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23
src/widgets/kernel/qwidget.cpp
View File

@ -2318,29 +2318,12 @@ void QWidget::createWinId()
*/
WId QWidget::effectiveWinId() const
{
WId id = internalWinId();
const WId id = internalWinId();
if (id || !testAttribute(Qt::WA_WState_Created))
return id;
QWidget *realParent = nativeParentWidget();
if (!realParent && d_func()->inSetParent) {
// In transitional state. This is really just a workaround. The real problem
// is that QWidgetPrivate::setParent_sys (platform specific code) first sets
// the window id to 0 (setWinId(0)) before it sets the Qt::WA_WState_Created
// attribute to false. The correct way is to do it the other way around, and
// in that case the Qt::WA_WState_Created logic above will kick in and
// return 0 whenever the widget is in a transitional state. However, changing
// the original logic for all platforms is far more intrusive and might
// break existing applications.
// Note: The widget can only be in a transitional state when changing its
// parent -- everything else is an internal error -- hence explicitly checking
// against 'inSetParent' rather than doing an unconditional return whenever
// 'realParent' is 0 (which may cause strange artifacts and headache later).
return 0;
}
// This widget *must* have a native parent widget.
Q_ASSERT(realParent);
Q_ASSERT(realParent->internalWinId());
if (const QWidget *realParent = nativeParentWidget())
return realParent->internalWinId();
return 0;
}
#ifndef QT_NO_STYLE_STYLESHEET

5
src/widgets/kernel/qwidget_qpa.cpp
View File

@ -989,7 +989,10 @@ void qt_qpa_set_cursor(QWidget *w, bool force)
static QPointer<QWidget> lastUnderMouse = 0;
if (force) {
lastUnderMouse = w;
} else if (lastUnderMouse && lastUnderMouse->effectiveWinId() == w->effectiveWinId()) {
} else if (lastUnderMouse) {
const WId lastWinId = lastUnderMouse->effectiveWinId();
const WId winId = w->effectiveWinId();
if (lastWinId && lastWinId == winId)
w = lastUnderMouse;
} else if (!w->internalWinId()) {
return; // The mouse is not under this widget, and it's not native, so don't change it.