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** Copyright (C) 2016 The Qt Company Ltd.
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** This file is part of the manual tests of the Qt Toolkit.
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import QtQuick 2.8
import Qt.labs.handlers 1.0

Item {
    id: root
    default property alias data: __contentItem.data
    property alias velocity: anim.velocity
    property alias contentX: __contentItem.x // sign is reversed compared to Flickable.contentX
    property alias contentY: __contentItem.y // sign is reversed compared to Flickable.contentY
    property alias contentWidth: __contentItem.width
    property alias contentHeight: __contentItem.height
    signal flickStarted
    signal flickEnded

    Item {
        id: __contentItem
        objectName: "__contentItem"
        width: childrenRect.width
        height: childrenRect.height

        property real xlimit: root.width - __contentItem.width
        property real ylimit: root.height - __contentItem.height

        function returnToBounds() {
            var startAnim = false
            if (x > 0) {
                returnToBoundsAnim.x = 0
                startAnim = true
            } else if (x < xlimit) {
                returnToBoundsAnim.x = xlimit
                startAnim = true
            }
            if (y > 0) {
                returnToBoundsAnim.y = 0
                startAnim = true
            } else if (y < ylimit) {
                returnToBoundsAnim.y = ylimit
                startAnim = true
            }
            if (startAnim)
                returnToBoundsAnim.start()
        }

        DragHandler {
            id: dragHandler
            onActiveChanged: if (!active) anim.restart(velocity)
        }
        MomentumAnimation {
            id: anim
            target: __contentItem
            onStarted: root.flickStarted()
            onStopped: {
                __contentItem.returnToBounds()
                root.flickEnded()
            }
        }
        ParallelAnimation {
            id: returnToBoundsAnim
            property Item target: __contentItem
            property int duration: 200
            property real x: 0
            property real y: 0

            NumberAnimation {
                id: xAnim
                target: returnToBoundsAnim.target
                property: "x"
                to: returnToBoundsAnim.x
                duration: returnToBoundsAnim.duration
                easing.type: Easing.OutQuad
            }
            NumberAnimation {
                id: yAnim
                target: returnToBoundsAnim.target
                property: "y"
                to: returnToBoundsAnim.y
                duration: returnToBoundsAnim.duration
                easing.type: Easing.OutQuad
            }
        }
    }
}