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  1. Qt
  2. QTBUG-55996

Qt 5.8 does not re-evaluate bindings in cases that Qt 5.6 did

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      Here is a distilled testcase. With Qt 5.6 "Hello" is changed to "Goodbye" after two seconds, because someProp changes value.

      With Qt 5.8, the change does not occur. Presumably, because the use of the property is inside an if() which is initially false, the QML engine does not track the property for changes.

      import QtQuick 2.3

Item {
    id: root

    width: 500
    height: 500

    property string someProp

    property var someObject: {return {
        cond: false
    }}

    function refreshText() {
        if (someObject.cond) {
            return someProp
        }
        return "Hello"
    }

    Text {
        width: 100
        height: 100
        x: 100
        y: 100
        text: refreshText()
    }

    Timer {
        running: true
        interval: 1000
        onTriggered: {
            console.log("Change condition")
            someObject.cond = true;
        }
    }

    Timer {
        running: true
        interval: 2000
        onTriggered: {
            console.log("Change string")
            someProp = "Goodbye"
        }
    }
}

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            shausman Simon Hausmann
            ske Steve
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              Created:
              Updated:
              Resolved:

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