SceneOverlay.qml Example File

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 import QtQuick 1.0

 Scene {
     id: root
     property int margin: 20
     property string contentType

     Content {
         id: content
         anchors.centerIn: parent
         width: parent.contentWidth
         contentType: root.contentType
         source: parent.source1
         volume: parent.volume
         onVideoFramePainted: root.videoFramePainted()
     }

     Rectangle {
         id: overlay
         y: 0.5 * parent.height
         width: content.width
         height: content.height
         color: "yellow"
         opacity: 0.5

         SequentialAnimation on x {
             id: xAnimation
             loops: Animation.Infinite
             property int from: margin
             property int to: 100
             property int duration: 1500
             running: false
             PropertyAnimation {
                 from: xAnimation.from
                 to: xAnimation.to
                 duration: xAnimation.duration
                 easing.type: Easing.InOutCubic
             }
             PropertyAnimation {
                 from: xAnimation.to
                 to: xAnimation.from
                 duration: xAnimation.duration
                 easing.type: Easing.InOutCubic
             }
         }

         SequentialAnimation on y {
             id: yAnimation
             loops: Animation.Infinite
             property int from: margin
             property int to: 180
             property int duration: 1500
             running: false
             PropertyAnimation {
                 from: yAnimation.from
                 to: yAnimation.to
                 duration: yAnimation.duration
                 easing.type: Easing.InOutCubic
             }
             PropertyAnimation {
                 from: yAnimation.to
                 to: yAnimation.from
                 duration: yAnimation.duration
                 easing.type: Easing.InOutCubic
             }
         }
     }

     onWidthChanged: {
         xAnimation.to = root.width - content.width - margin
         xAnimation.start()
     }

     onHeightChanged: {
         //yAnimation.to = root.height - content.height - margin
         yAnimation.start()
     }

     Component.onCompleted: root.content = content
 }