How forbid change of parameters?

[Trikrista]

There is a list:

    ListModel {
        id: modelWidget

        ListElement {
            widget: "Widget0.qml"
            type: 0
        }

        ListElement {
            widget: "Widget2.qml"
            type: 1
        }

        ListElement {
            widget: "Widget2.qml"
            type: 2
        }

        ListElement {
            widget: "Widget3.qml"
            type: 3
        }
    }

    Component {
        id: delegateWidget

        Item {
            id: item

            //...
            visible: (!listWidget.isMove || (listWidget.firstMoveItem == type || listWidget.lastMoveItem == type)) ? true : false

            Component.onCompleted: {
                var component = Qt.createComponent(model.widget);
                var childRec = component.createObject(item);
                childRec.anchors.fill = item
            }
        }
    }

    ListView {
        id: listWidget

        property bool isMove: false
        property int firstMoveItem
        property int lastMoveItem
        //...
        snapMode: ListView.SnapOneItem
        orientation: ListView.Horizontal

        delegate: delegateWidget
        model: modelWidget
    }

    NumberAnimation {
        id: animationList
        target: listWidget
        property: "contentX"
        duration: 500
        easing.type: Easing.InExpo
        easing.amplitude: 20.0; easing.period: 1.5

        onStarted: {
            listWidget.isMove = true
        }

        onStopped: {
            listWidget.isMove = false
        }
    }

so is the start animation when moving:

        function changedCurrentWidget(num) {
            animationList.running = false
            var pos = listWidget.contentX;
            listWidget.firstMoveItem = listWidget.indexAt(pos, 0)
            listWidget.lastMoveItem = num
            var destPos;
            listWidget.positionViewAtIndex(num, ListView.End);
            destPos = listWidget.contentX;
            animationList.from = pos;
            animationList.to = destPos;
            animationList.running = true;
        }

During the animation change the size of widgets. How to fix it?
And animations are laggy on Android. How to fix it?

[p3c0]

@Trikrista Can you explain a little bit more precise ?

[Trikrista]

@p3c0 If I flip a list that onHeightChanged writes that the height = 0

[p3c0]

@Trikrista Do you mean something like exclude ?