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/****************************************************************************
**
** Copyright (C) 2015 Digia Plc and/or its subsidiary(-ies).
** Contact: For any questions to Digia, please use the contact form at
** http://www.qt.io
**
** This file is part of the examples of the Qt Enterprise Embedded.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 Digia Plc and its Subsidiary(-ies) 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 2.1
Item {
id: main
property real minimumValue: 1
property real maximumValue: 2048
property real valueSpacing: 50
property real lowValue: minimumValue
property real highValue: maximumValue
implicitHeight: 50
Component {
id: handleComponent
Image {
property alias touchPoint: lowTouchPoint
anchors.fill: parent
source: "handle.png"
MultiPointTouchArea {
id: lowTouchArea
anchors.fill: parent
touchPoints: [
TouchPoint {
id: lowTouchPoint
property real draggedX: pressed ? sceneX - _startSceneX : 0
property real baseX: pressed ? _startBaseX : _handleItem.x
property real _startSceneX
property real _startBaseX
onSceneXChanged: updateHandlesPosFromDrag()
onPressedChanged: {
_startBaseX = _handleItem.x
_startSceneX = lowTouchArea.mapToItem(null, x).x
}
}
]
}
}
}
Rectangle {
anchors { left: parent.left; right: parent.right; verticalCenter: parent.verticalCenter }
height: 10
gradient: Gradient {
GradientStop { position: 0.0; color: "lightgrey" }
GradientStop { position: 1.0; color: "grey" }
}
radius: 4
}
Rectangle {
anchors { verticalCenter: parent.verticalCenter; left: lowHandle.horizontalCenter; right: highHandle.horizontalCenter }
height: 20
gradient: Gradient {
GradientStop { position: 0.0; color: "#006CD9" }
GradientStop { position: 1.0; color: "#00407F" }
}
}
Loader {
id: lowHandle
property var touchPoint: item.touchPoint
anchors { top: parent.top; bottom: parent.bottom }
width: height
sourceComponent: handleComponent
property bool _hInvertComponent: false
property Item _handleItem: this
onXChanged: if (!_programmaticalChange) lowValue = _convert(lowHandle.x, _minimumLowPos, _maximumLowPos, minimumValue, maximumValue - valueSpacing)
}
Loader {
id: highHandle
property var touchPoint: item.touchPoint
anchors { top: parent.top; bottom: parent.bottom }
width: height
sourceComponent: handleComponent
property bool _hInvertComponent: true
property Item _handleItem: this
onXChanged: if (!_programmaticalChange) highValue = _convert(highHandle.x, _minimumHighPos, _maximumHighPos, minimumValue + valueSpacing, maximumValue)
}
property bool _programmaticalChange: false
property real _minimumLowPos: -lowHandle.width / 2
property real _maximumHighPos: main.width - highHandle.width / 2
property real _maximumLowPos: _maximumHighPos - lowHandle.width
property real _minimumHighPos: _minimumLowPos + lowHandle.width
on_MaximumLowPosChanged: updateHandlesPosFromLimits()
on_MaximumHighPosChanged: updateHandlesPosFromLimits()
function _convert(src, srcMin, srcMax, dstMin, dstMax) {
return (src - srcMin) / (srcMax - srcMin) * (dstMax - dstMin) + dstMin
}
function updateHandlesPosFromDrag() {
var lowX, highX;
if (lowHandle.touchPoint.baseX + lowHandle.touchPoint.draggedX > highHandle.touchPoint.baseX + highHandle.touchPoint.draggedX - lowHandle.width) {
var overdrag = lowHandle.touchPoint.baseX + lowHandle.touchPoint.draggedX - (highHandle.touchPoint.baseX + highHandle.touchPoint.draggedX - lowHandle.width)
// Not perfect when only one touch point is pressed, but works well enough.
var handleOverdragAdj = overdrag / 2
lowX = lowHandle.touchPoint.baseX + lowHandle.touchPoint.draggedX - handleOverdragAdj
highX = highHandle.touchPoint.baseX + highHandle.touchPoint.draggedX + handleOverdragAdj
} else {
lowX = lowHandle.touchPoint.baseX + lowHandle.touchPoint.draggedX
highX = highHandle.touchPoint.baseX + highHandle.touchPoint.draggedX
}
if (lowX < _minimumLowPos)
lowX = _minimumLowPos
if (highX < lowX + lowHandle.width)
highX = lowX + lowHandle.width
if (highX > _maximumHighPos)
highX = _maximumHighPos
if (lowX > highX - lowHandle.width)
lowX = highX - lowHandle.width
lowHandle.x = lowX
highHandle.x = highX
}
function updateHandlesPosFromLimits() {
_programmaticalChange = true
lowHandle.x = _convert(lowValue, minimumValue, maximumValue - valueSpacing, _minimumLowPos, _maximumLowPos)
highHandle.x = _convert(highValue - valueSpacing, minimumValue, maximumValue - valueSpacing, _minimumHighPos, _maximumHighPos)
_programmaticalChange = false
}
}
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