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  1. Qt
  2. QTBUG-67032

Mouse Wheel event gets propagated even when event filter should stop it

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Details

    • 92df790f46b3a8b17aec2f385d6472fd3f8647f6 (qt/qtbase/dev)
    • 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

      Attachments

        1. qtbug67032_diag.diff
          5 kB
          Friedemann Kleint
        2. qtbug67032.zip
          2 kB
          Friedemann Kleint
        3. qtbug67032.zip
          0.9 kB
          Jussi Witick

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-47007 mousePressEvent of QWidget gets called even though QTabletEvent was accepted [Qt 5.4.2]

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-50199 [OS X] Mouse scroll event started from one widget continues when moving mouse cursor over another widget

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-59214 Wacom: it seems tabletEvent() by deault accepting it.

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-65199 Using a tablet (wacom intuos pro) fails to provoke enter/leave events when a widget border is crossed

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
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              vhilshei Volker Hilsheimer
              jussi_witick Jussi Witick
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              Dates

                Created:
                Updated:
                Resolved:

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