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Details

Type: Bug
Resolution: Done
Priority: P3: Somewhat important
Fix Version/s: None
Affects Version/s: 5.10.1, 5.11.2, 5.12.0
Component/s: GUI: Basic Input System (keyboard, mouse, touch)
Labels:
- Reported_by_support_standard
Environment:
Windows, Linux

Commits:
92df790f46b3a8b17aec2f385d6472fd3f8647f6 (qt/qtbase/dev)
Sprint:
Bug Fixing Week Q2/2020, Bug Fixing Candidates

Description

Mouse Wheel event gets propagated to parent widgets even when event filter is installed and is returning true for the specified event.

Only way to stop the wheel event is to accept the event, which will stop propagation regardless of the event filter's return value.

Steps to reproduce:

Run attached sample
Use mouse wheel
EXPECTED: Wheel event is not received by the MainWindow's event filter
ACTUAL: Wheel events are leaked through to MainWindow even when event filter of the centralWidget should stop it

With same steps using mouse left button, the button press is never leaked to the MainWindow.

QWidgetWindow/"TopWindow" QMouseEvent(MouseButtonPress, LeftButton, localPos=104,53, screenPos=104,82) 0x7ffc95a02dc0
QWidget/"central" QMouseEvent(MouseButtonPress, LeftButton, localPos=104,53, screenPos=104,82) 0x7ffc95a02a20
MouseButtonPress  on "central" central" QMouseEvent(MouseButtonPress, LeftButton, localPos=104,53, screenPos=104,82) 0x7ffc95a02a20 accepted=true returns true

QWidgetWindow/"TopWindow" QWheelEvent(pixelDelta=QPoint(0,0), angleDelta=QPoint(0,-120)) 0x7ffc95a02e50
QWidget/"central" QWheelEvent(pixelDelta=QPoint(0,0), angleDelta=QPoint(0,-120)) 0x7ffc95a029c0
Wheel on "central" "central" QWheelEvent(pixelDelta=QPoint(0,0), angleDelta=QPoint(0,-120)) 0x7ffc95a029c0 accepted=false returns true
QMainWindow/"Top" QWheelEvent(pixelDelta=QPoint(0,0), angleDelta=QPoint(0,-120)) 0x7ffc95a029c0
Wheel on "Top" "Top" QWheelEvent(pixelDelta=QPoint(0,0), angleDelta=QPoint(0,-120)) 0x7ffc95a029c0 accepted=false returns true

Compared to Qt 4

"4.8.7" () 
QWidget/""central"" QWheelEvent(delta=-120, pos=QPoint(107,64) , orientation= 2 )    0x7ffe9da84e80  accepted= true  spont

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qtbug67032_diag.diff
5 kB
20 Mar '18 14:55
qtbug67032.zip
2 kB
21 Mar '18 08:16
qtbug67032.zip
0.9 kB
20 Mar '18 07:20

Issue Links

relates to

QTBUG-47007 mousePressEvent of QWidget gets called even though QTabletEvent was accepted [Qt 5.4.2]

Closed

QTBUG-50199 [OS X] Mouse scroll event started from one widget continues when moving mouse cursor over another widget

Closed

QTBUG-59214 Wacom: it seems tabletEvent() by deault accepting it.

Closed

QTBUG-65199 Using a tablet (wacom intuos pro) fails to provoke enter/leave events when a widget border is crossed

Closed

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For Gerrit Dashboard: QTBUG-67032
#	Subject	Branch	Project	Status	CR	V
297942,5	QApplication: refactor delivery and propagation of wheel events	dev	qt/qtbase	Status: MERGED	+2	0
364737,2	Accept the QWheelEvent before each propagation step	dev	qt/qtbase	Status: MERGED	+2	0
365054,2	Accept the QWheelEvent before each propagation step	6.2	qt/qtbase	Status: MERGED	+2	0
365055,2	Accept the QWheelEvent before each propagation step	6.1	qt/qtbase	Status: MERGED	+2	0
365204,2	Accept the QWheelEvent before each propagation step	6.1.3	qt/qtbase	Status: MERGED	+2	0