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  1. Qt
  2. QTBUG-34071

Applying a Behavior on an attached property asserts

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      I believe this is a bug in the Behavior element of the QML language. However, only layouts currently uses attached properties that can in theory be animated (however, its a bad idea due to performance reasons).
      I'm not sure if we want the Behavior element to support attached properties like this, but it should not assert.

      Opening this with qmlscene gives:

      ASSERT: "mo" in file qml\qqmlvme.cpp, line 853

      import QtQuick 2.1
import QtQuick.Layouts 1.1

Item {
    width: 300
    height: 400
    
    RowLayout {
        anchors.fill: parent
        Rectangle {
            color: "red"
            Layout.preferredWidth: 50
            Layout.fillHeight: true
        }
        Rectangle {
            color: "yellow"
            Layout.fillWidth: true
            Layout.fillHeight: true
        }
        Behavior on Layout.preferredWidth {
            NumberAnimation { duration: 1000 }
        }
    }
}

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            shausman Simon Hausmann
            smd Jan Arve
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              Created:
              Updated:
              Resolved:

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