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  1. Qt
  2. QTBUG-126380

Usage of PinchHandler/PinchArea + DragHandler Results in Image/Object Jumps

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Details

    • Bug
    • Resolution: Unresolved
    • P2: Important
    • None
    • 6.6.3
    • Quick: Core Declarative QML
    • None
    • Android

    Description

      When using both PinchHandler/PinchArea and DragHandler in a Rectangle/Image/etc to enable pinch-zoom and drag functionality, the image or object occasionally jumps unexpectedly. This issue disrupts the smooth interaction expected for image/object manipulation.

      Tested and observed the bug occurring in both Android 10 and Android 14 (video included in this report qtBug1.mp4).

      Code to reproduce (also happens with Image):

       

      import QtQuick

Window {
  width: 640
  height: 480
  visible: true

  Rectangle {
    id: imagePreview

    height: parent.height / 2
    width: height
    color: "blue"

    PinchHandler {
      minimumRotation: -180
      maximumRotation: 180
      minimumScale: 0.5
      maximumScale: 10
    }

    DragHandler { }
  }
}

       

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        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-67965 PinchHandler: if the first-pressed touchpoint is released first, the target item jumps

          • 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.
          • Reported

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-98043 PinchHandler target scale is jumpy on Windows

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Reported
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              srutledg Shawn Rutledge
              vitorvieira Vitor Vieira
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              Dates

                Created:
                Updated:

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