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  1. Qt
  2. QTBUG-140858

[REG: 6.8 -> 6.9] QML Conditional Binding does not restore original value

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    • Linux/Wayland

      According to Binding QML Type the Binding Type should restore a property to its original binding as soon as the when condition is false.

      This does not to be the case at all and can be reproduced in the following example.

      I expect the left Rectangle to switch its color from blue to transparent once every second. But it only switches to blue once.

      import QtQuick

Window {
    id: root

    property bool isRectBlue: false

    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    Timer {
        interval: 1000
        repeat: true
        running: true
        onTriggered: function () {
            root.isRectBlue = !root.isRectBlue
        }
    }

    Rectangle {
        anchors {
            top: parent.top
            left: parent.left
            right: parent.horizontalCenter
            bottom: parent.bottom
        }

        Binding on color {
            when: root.isRectBlue
            value: "blue"
        }
    }

    Rectangle {
        anchors {
            top: parent.top
            left: parent.horizontalCenter
            right: parent.right
            bottom: parent.bottom
        }

        color: root.isRectBlue ? "blue" : "transparent"
    }
}

      The full compiling example is appended.

        1. BindingBug.tar.gz
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            qtqmlteam Qt Qml Team User
            doschr Dominik Schütz
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              Created:
              Updated:

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