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Details

Type: Bug
Resolution: Done
Priority: P3: Somewhat important
Fix Version/s: 5.15.12, 6.2.7, 6.4.2, 6.5.0 Beta1
Affects Version/s: 5.4.0, 5.4.1, 5.4.2, 5.5.0 Beta
Component/s: GUI: Painting, QPA: X11/XCB, Widgets: Widgets and Dialogs
Labels:
None
Environment:
Linux/XCB

Commits:
71c3aab7ba (qt/qtbase/dev) 71c3aab7ba (qt/tqtc-qtbase/dev) f4eb4c5f30 (qt/qtbase/6.4) f4eb4c5f30 (qt/tqtc-qtbase/6.4) bf4517f435 (qt/tqtc-qtbase/6.2) 9caae71cfb (qt/tqtc-qtbase/5.15)

Description

Using QPainter in paintEvent() with attribute Qt::WA_PaintOnScreen doesn't work with Qt5 (works with Qt4).
Console output:

QWidget::paintEngine: Should no longer be called
QWidget::paintEngine: Should no longer be called
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1

I know, that I can override paintEngine() and return nullptr and draw using X11 functions, but QPainter is much simpler and faster to use.

Attachments

Issue Links

relates to

QTBUG-100085 xcb: Native window does not get paint event if another window on top of it is hidden unless there is a enter/leave event somewhere

Closed

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For Gerrit Dashboard: QTBUG-46681
#	Subject	Branch	Project	Status	CR	V
438666,10	xcb: Flush Display when processing xcb events	dev	qt/qtbase	Status: MERGED	+2	0
441625,2	xcb: Flush Display when processing xcb events	6.4	qt/qtbase	Status: MERGED	+2	0
441628,3	xcb: Flush Display when processing xcb events	tqtc/lts-6.2	qt/tqtc-qtbase	Status: MERGED	+2	0
441629,3	xcb: Flush Display when processing xcb events	tqtc/lts-5.15	qt/tqtc-qtbase	Status: MERGED	+2	0