QML animations visible property changes

Question

I want an animation to be painted when an element becomes visible (is should appear smoothly, not the whole at all)

I tried this

states: State
{
    name         


        

Answer 1

visibility can be used in NumberAnimation, but to get the needed fading result, opacity animation could be used; like turning visibility ON from function like the following example:

Rectangle{
    id:fadingRect
    anchors.fill: parent
    visible: false
    opacity: 0.00
    color: "red"
    Component.onCompleted: {
        animRect.start()
    }
}
SequentialAnimation{
    id:animRect
    NumberAnimation { target: fadingRect; property: "visible"; from: 0; to:1; duration: 20}
    NumberAnimation { target: fadingRect; property: "opacity"; from: 0.00; to:1.00; duration: 4000 }

    onStopped: console.log(fadingRect.visible)
}

Or :

Rectangle{
    id:fadingRect
    anchors.fill: parent
    visible: false
    opacity: 1
    color: "red"
    Component.onCompleted: {
        animRect.start()
    }
        NumberAnimation { id:animRect; target: fadingRect; property: "opacity"; from: 0; to:1; duration: 2000;
        onStarted: { fadingRect.visible=true; console.log(fadingRect.visible)}
        }
}