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Don't try to render a pixmap when there isn't any.

Browse Source 
This happened in cases when QDrag choose not to use a
pixmap to represent data in a drag and drop operation.

The chain that leads to QPainter errors begins in
QBasicDrag::startDrag() where we call setPixmap() with
Null pixmap, which later calls updateGeometry() which
leads to calling render() before the backing store
has been resized.

Task-number: QTBUG-29283
Change-Id: I2145159d3f23dbde2cba2ca9aa1788e222aba02a
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
This commit is contained in:
Gatis Paeglis 2013-01-23 15:45:52 +01:00 committed by The Qt Project
parent 45be71bf7d
commit 3a2b3fc0d7
2 changed files with 5 additions and 1 deletions
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4
src/platformsupport/dnd/qshapedpixmapdndwindow.cpp
View File

@ -91,7 +91,9 @@ void QShapedPixmapWindow::setHotspot(const QPoint &hotspot)
void QShapedPixmapWindow::updateGeometry()
{
QRect rect(QCursor::pos() - m_hotSpot, m_pixmap.size());
if (m_backingStore->size() != m_pixmap.size())
if (m_pixmap.isNull())
m_backingStore->resize(QSize(1,1));
else if (m_backingStore->size() != m_pixmap.size())
m_backingStore->resize(m_pixmap.size());
setGeometry(rect);
}

2
src/platformsupport/dnd/qsimpledrag.cpp
View File

@ -207,6 +207,8 @@ void QBasicDrag::resetDndState(bool /* deleteSource */)
void QBasicDrag::startDrag()
{
// ### TODO Check if its really necessary to have m_drag_icon_window
// when QDrag is used without a pixmap - QDrag::setPixmap()
if (!m_drag_icon_window)
m_drag_icon_window = new QShapedPixmapWindow();