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+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** 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 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 2.8
+import Qt.labs.handlers 1.0
+
+Item {
+ id: root
+ objectName: label
+ property int value: 50
+ property int maximumValue: 99
+ property alias label: label.text
+ property alias tapEnabled: tap.enabled
+ property alias pressed: tap.pressed
+ signal tapped
+ width: 140
+ height: 400
+
+ Rectangle {
+ id: slot
+ anchors.top: parent.top
+ anchors.bottom: parent.bottom
+ anchors.margins: 10
+ anchors.topMargin: 30
+ anchors.bottomMargin: 30
+ anchors.horizontalCenter: parent.horizontalCenter
+ width: 10
+ color: "black"
+ radius: width / 2
+ smooth: true
+ }
+
+ Rectangle {
+ id: glow
+ anchors.fill: knob
+ anchors.margins: -5
+ anchors.leftMargin: -2
+ anchors.horizontalCenterOffset: 1
+ radius: 5
+ color: "#4400FFFF"
+ opacity: tap.pressed || tapFlash.running ? 1 : 0
+ FlashAnimation on visible {
+ id: tapFlash
+ }
+ }
+ Rectangle {
+ id: knob
+ objectName: root.label + " Knob"
+ width: parent.width - 2
+ height: 30
+ radius: 5
+ color: "darkgray"
+ border.color: "black"
+ property bool programmatic: false
+ property real multiplier: root.maximumValue / (dragHandler.yAxis.maximum - dragHandler.yAxis.minimum)
+ onYChanged: if (!programmatic) root.value = root.maximumValue - (knob.y - dragHandler.yAxis.minimum) * multiplier
+ transformOrigin: Item.Center
+ function setValue(value) { knob.y = dragHandler.yAxis.maximum - value / knob.multiplier }
+ function flash() { tapFlash.start() }
+ DragHandler {
+ id: dragHandler
+ objectName: label.text + " DragHandler"
+ xAxis.enabled: false
+ yAxis.minimum: slot.y
+ yAxis.maximum: slot.height + slot.y - knob.height
+ }
+ TapHandler {
+ id: tap
+ objectName: label.text + " TapHandler"
+ gesturePolicy: TapHandler.DragThreshold
+ onTapped: {
+ tapFlash.start()
+ root.tapped
+ }
+ }
+ }
+
+ Text {
+ font.pointSize: 16
+ color: "red"
+ anchors.bottom: parent.bottom
+ anchors.horizontalCenter: parent.horizontalCenter
+ text: root.value
+ }
+
+ Text {
+ id: label
+ font.pointSize: 12
+ color: "red"
+ anchors.top: parent.top
+ anchors.topMargin: 5
+ anchors.horizontalCenter: parent.horizontalCenter
+ }
+
+ Component.onCompleted: {
+ knob.programmatic = true
+ knob.setValue(root.value)
+ knob.programmatic = false
+ }
+}