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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
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()
}
}
}
}
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