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++ // Copyright (C) 2021 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ import QtQuick
++ import Qt.labs.animation
++
++ Item {
++ id: root
++ objectName: "viewport"
++ 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
++
++ BoundaryRule on x {
++ id: xbr
++ minimum: root.width - __contentItem.width
++ maximum: 0
++ minimumOvershoot: 100
++ maximumOvershoot: 100
++ overshootFilter: BoundaryRule.Peak
++ }
++
++ BoundaryRule on y {
++ id: ybr
++ minimum: root.height - __contentItem.height
++ maximum: 0
++ minimumOvershoot: 100
++ maximumOvershoot: 100
++ overshootFilter: BoundaryRule.Peak
++ }
++
++ DragHandler {
++ id: dragHandler
++ onActiveChanged:
++ if (active) {
++ anim.stop()
++ root.flickStarted()
++ } else {
++ var vel = centroid.velocity
++ if (xbr.returnToBounds())
++ vel.x = 0
++ if (ybr.returnToBounds())
++ vel.y = 0
++ if (vel.x !== 0 || vel.y !== 0)
++ anim.restart(vel)
++ else
++ root.flickEnded()
++ }
++ }
++ WheelHandler {
++ rotationScale: 15
++ property: "x"
++ orientation: Qt.Horizontal
++ acceptedDevices: PointerDevice.Mouse | PointerDevice.TouchPad
++ onActiveChanged:
++ // emitting signals in both instances is redundant but hard to avoid
++ // when the touchpad is flicking along both axes
++ if (active) {
++ anim.stop()
++ root.flickStarted()
++ } else {
++ xbr.returnToBounds()
++ root.flickEnded()
++ }
++ }
++ WheelHandler {
++ rotationScale: 15
++ property: "y"
++ orientation: Qt.Vertical
++ acceptedDevices: PointerDevice.Mouse | PointerDevice.TouchPad
++ onActiveChanged:
++ if (active) {
++ anim.stop()
++ root.flickStarted()
++ } else {
++ ybr.returnToBounds()
++ root.flickEnded()
++ }
++ }
++ MomentumAnimation {
++ id: anim
++ target: __contentItem
++ onStarted: root.flickStarted()
++ onStopped: {
++ xbr.returnToBounds()
++ ybr.returnToBounds()
++ root.flickEnded()
++ }
++ }
++ }
++ }