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  1. Qt
  2. QTBUG-72110

MouseArea stops responding

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      Description

      <UDPATE>

      Thanks to Shawn Rutledge’s help, I found what causes this bug.

      Modern Android devices can recognize certain hand gestures (see attached pictures). For example:

      • on Xiaomi and Huawei devices you can take a screenshot by sliding 3 fingers down
      • on Samsung devices you can take a screenshot by swiping the edge of your hand across the screen [called: Palm swipe]
      • on Samsung devices you can mute incoming calls or alarms by putting your hand over the screen [called: Easy mute].

      Probably the following happens:

      1. The MouseArea captures the Press event.
      2. The OS recognizes it as a gesture, not a touch.
        "Xiaomi: D ViewRootImpl: cancle motionEvent because of threeGesture detecting"
      3. The MouseArea never gets notified that the Press was cancelled due to gesture recognition.

      </UDPATE>

       

      On android devices the MouseArea becomes irreversibly unresponsive if touched in an unusual way.

      Tested devices:

      FAILED: Samsung Galaxy TAB A 2016 (SM-T585) – Android 7.0

      FAILED: Xiaomi Redmi Note 5 Pro – Android 8.1.0

      FAILED: Huawei P9 Lite (2017) – Android 8.0.

      FAILED: Samsung Galaxy Edge S7 – Android 8.0.

      FAILED: Samsung Galaxy A7 2015 – Android 6.0.1

       

      OK: Lenovo Moto Z – Android 8.0

      OK: OnePlus 5 – Android 8.1

      OK: Samsung Galaxy Tab 3 Lite (SM-T110) – Android 4.2.2

      OK: Asus Nexus 7 (2012) – Android 5.1.1

      OK: Vodafone Smart Mini – Android 4.1.1

       

      The error message:

      W libMouseTest.so: (null):0 ((null)): TouchPointPressed without previous release event QQuickEventPoint(accepted:false state:Pressed scenePos:QPointF(714.667,504.667) id:2000001 timeHeld:0)

      I attach an example project and a test apk built with Qt 5.12.0 RC2.

      This bug is a big problem for my users living with movement disability as the program freezes easily after a not well-controlled touch. Please help me solve this issue. Any quick workaround would be much appreciated as hundreds of my users have reported this problem.

       

        Attachments

        1. ActionCancelExample.zip
          2 kB
        2. MouseTest.zip
          5 kB
        3. SamsungGestures.png
          SamsungGestures.png
          108 kB
        4. SignedTest.apk
          7.23 MB
        5. XiaomiGestures.png
          XiaomiGestures.png
          115 kB
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            People

            Assignee:
            bartlomiejmoskal Bartlomiej Moskal
            Reporter:
            balazs Zsombori Balázs
            Votes:
            6 Vote for this issue
            Watchers:
            15 Start watching this issue

              Dates

              Created:
              Updated:
              Resolved: