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import QtQuick 2.9
import QtQuick.Shapes 1.0

Rectangle {
    id: root
    width: 1024
    height: 768

    property color col: "lightsteelblue"
    gradient: Gradient {
        GradientStop { position: 0.0; color: Qt.tint(root.col, "#20FFFFFF") }
        GradientStop { position: 0.1; color: Qt.tint(root.col, "#20AAAAAA") }
        GradientStop { position: 0.9; color: Qt.tint(root.col, "#20666666") }
        GradientStop { position: 1.0; color: Qt.tint(root.col, "#20000000") }
    }

    Rectangle {
        id: scissorRect
        width: 200
        height: 200
        x: 150
        property real centerY: parent.height / 2 - height / 2
        property real dy: 0
        y: centerY + dy
        clip: true

        Loader {
            id: loader1
            width: parent.width
            height: parent.height
            y: 25 - scissorRect.dy
            source: "tiger.qml"
            asynchronous: true
            visible: status === Loader.Ready
        }

        SequentialAnimation on dy {
            loops: Animation.Infinite
            running: loader1.status === Loader.Ready && loader1.item.status === Shape.Ready
            NumberAnimation {
                from: 0
                to: -scissorRect.centerY
                duration: 2000
            }
            NumberAnimation {
                from: -scissorRect.centerY
                to: scissorRect.centerY
                duration: 4000
            }
            NumberAnimation {
                from: scissorRect.centerY
                to: 0
                duration: 2000
            }
        }
    }

    // With a more complex transformation (like rotation), stenciling is used
    // instead of scissoring, this is more expensive. It may also trigger a
    // slower code path for Shapes, depending on the path rendering backend
    // in use, and may affect rendering quality as well.
    Rectangle {
        id: stencilRect
        width: 300
        height: 200
        anchors.right: parent.right
        anchors.rightMargin: 100
        anchors.verticalCenter: parent.verticalCenter
        clip: true // NB! still clips to bounding rect (not shape)

        Loader {
            id: loader2
            width: parent.width
            height: parent.height
            source: "tiger.qml"
            asynchronous: true
            visible: status === Loader.Ready
        }

        NumberAnimation on rotation {
            from: 0
            to: 360
            duration: 5000
            loops: Animation.Infinite
        }
    }
}