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  1. Qt
  2. QTBUG-108896

[REG 6.2.4-6.3.2] Using PinchHandler for Flickable's child makes the Flickable transparent for touch events

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Details

    • macOS
    • 7ef3bee4f (dev), b0541aa82 (6.5), 0e61fbf8d (6.5.0)

    Description

      While investigating some strange bug with Handlers in my own app I've found strange bug in Qt - using PinchHandler for Flickable's child makes the Flickable's transparent for touch events. As soon as I can see this is regression at some point after 6.2.4.

      Code sample:

      import QtQuick

Window {
    width: 640
    height: 480
    visible: true

    TapHandler {
        onTapped: {
            color = Qt.rgba(Math.random(1), Math.random(1), Math.random(1), 1)
        }
    }

    Flickable {
        anchors.fill: parent
        contentWidth: content.width
        contentHeight: content.height
        Rectangle {
            id: content
            width: 200
            height: 200
            color: 'red'
            PinchHandler {}
        }
    }
}

      See video Screen Recording 2022-11-25 at 23.06.26.mov

      Steps to reproduce:

      1. Pinch red rectangle few times
      2. Click the left button several times, at some point all clicks will start to propagate to the underlying TapHandler (it changes the window's color when processing touches)

      Reproduces at least on macOS with touchpad.

      Attachments

        Issue Links

          is required for

          Technical task - A technical task. QTBUG-108924 Revamp Photo surface example

          • Not Evaluated - Not yet evaluated/prioritized
          • Open
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-107239 DragHandler propagates tap event through Flickable to underlying TapHandler

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Reported

          Task - A task that needs to be done. QTBUG-94012 handlers in underlying or parent items should be able to avoid reacting when a higher-z or child item already handled 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-109655 Pinch gestures are broken in QML Photo Surface example

          • 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

          Activity

            People

              srutledg Shawn Rutledge
              studiosus Vladimir Belyavsky
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              3 Vote for this issue
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              7 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved: