Is this behavior of SpringAnimation normal?



  • Have a quick look at the code below. If you run it and spam the button, you will notice that it wont return to its desired position. This wont happen if you click it slowly and wait for the animation to finish.

    If instead of a SpringAnimation animation you use PropertyAnimation then the problem disappears.

    Is this normal, or a bug ?

    import QtQuick 2.2
    import QtGraphicalEffects 1.0
    
    Item {
        id: menuButton    
        state: "Closed"
    
        Rectangle {
            id: menuButtonIcon
            anchors.centerIn: parent
            //color: Qt.lighter("#C02A25", 1.25)
            color: "#D23F31"
            width: 65;
            height: 65;
            radius: width * 0.5
            antialiasing: true
            visible: false;
        }
    
        DropShadow {
            id: menuButtonIconShadow
            source: menuButtonIcon
            anchors.fill: source
            width: source.width
            height: source.height
            cached: true
            radius: 8.0
            samples: 16
            color: "#60000000"
            smooth: true
            horizontalOffset: 0.0
            verticalOffset: 0.0
            spread: 0.2
            transparentBorder: true
        }
    
        Rectangle {
            id: menuButtonIconBar1
            anchors.centerIn: menuButtonIcon
            width: 17
            height: 3
            antialiasing: true
        }
    
        Rectangle {
            id: menuButtonIconBar2
            anchors.centerIn: menuButtonIcon
            width: 17
            height: 3
            antialiasing: true
            rotation: 90
        }
    
        MouseArea {
            id: mouseArea
            anchors.fill: menuButtonIcon
            onPressed: menuButton.state = menuButton.state === "Open" ? "Closed" : "Open"
            //onClicked: menuButton.state = menuButton.state === "Open" ? "Closed" : "Open"
        }
    
        states: [
            State {
                name: "Closed"
            },
            State {
                name: "Open"
                PropertyChanges { target: menuButtonIconBar1; rotation: 135; scale: 0.92}
                PropertyChanges { target: menuButtonIconBar2; rotation: 225; scale: 0.92}
                PropertyChanges { target: menuButtonIconShadow; scale: 0.92}
            }
        ]
    
        transitions: [
            Transition {
                //RotationAnimation { target: menuButtonIconBar1; properties: "rotation"; duration: 400; easing.type: Easing.InOutQuad }
                //PropertyAnimation { target: menuButtonIconBar2; properties: "rotation"; duration: 400; easing.type: Easing.InOutQuad }
                //PropertyAnimation { target: menuButtonIconShadow; properties: "scale"; duration: 400; easing.type: Easing.InOutQuad }
                SpringAnimation { target: menuButtonIconShadow; properties: "scale"; spring: 3; damping: 0.25; epsilon: 0.2; mass: 1; modulus: 0; velocity: 0 }
                SpringAnimation { target: menuButtonIconBar1; properties: "rotation, scale"; spring: 3; damping: 0.25; epsilon: 0.5; mass: 1; modulus: 0; velocity: 0 }
                SpringAnimation { target: menuButtonIconBar2; properties: "rotation, scale"; spring: 3; damping: 0.25; epsilon: 0.5; mass: 1; modulus: 0; velocity: 0 }
            }
        ]
    }
    

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