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  1. Qt
  2. QTBUG-131905

Don't emit valueChanged signal at the initial binding evaluation

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    Description

      Code

      import QtQuick

Window {
    id: root
    width: 640
    height: 480
    visible: true

    property int constVal: 100
    property int boundVal: true ? 100 : 100

    onConstValChanged: console.log("constValChanged:", root.constVal)
    onBoundValChanged: console.log("boundValChanged:", root.boundVal)
}

       

      Outcomes on Qt 6.8.1
      When the app starts up...

      • ...we see "boundValChanged: 100"
      • ...we don't see ""constValChanged"

       

      Suggestion
      Both constVal and boundVal should behave the same, from the point of view of valueChanged signals

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-114403 No way to set initial properties in QtQuick

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

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-131901 "var" and "variant" type properties emit valueChanged signal even when value remains unchanged

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
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              qtqmlteam Qt Qml Team User
              skoh-qt Sze Howe Koh
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              Dates

                Created:
                Updated:

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