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  1. Qt
  2. QTBUG-66945

Qt Qml: sometimes properties expressions are evaluated twice during initialization

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Details

    • Bug
    • Resolution: Done
    • P1: Critical
    • 5.11.0 Beta 2
    • 5.6.3, 5.7.1, 5.9.3, 5.10.0
    • QML: Declarative and Javascript Engine
    • None
    • Tested on:

      Bug: Linux 5.9.3, 5.10,SailfishOS 5.6.3, iOS 5.7.1

      Works: Windows 5.5.1

    Description

       

      I think that example is self explanatory. getTmp1Value function is called twice during property initialization phase. It seems a regression - on Qt < 5.6 it works as expected - called once

      import QtQuick 2.0

QtObject {
    property int tmp0: tmp1 + 1
    property int tmp1: getTmp1Value()

    function getTmp1Value() {
        console.log("getTmp1Value should be called only once");
        return 1;
    }
}

       I emphasize that changing order of properties fixes the bug:

      property int tmp1: getTmp1Value()
property int tmp0: tmp1 + 1

       

       

      Attachments

        Issue Links

          duplicates

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-60746 Double-Initialisation of values upon QObject creation

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

          Task - A task that needs to be done. QTBUG-63067 Performance and memory consumption improvements for QtQml

          • 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
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-60427 QML setter being entered multiple times.

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

          Activity

            People

              shausman Simon Hausmann
              tolszak Tomasz Olszak
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              3 Vote for this issue
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              9 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved: