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+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the manual tests of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.8
+import Qt.labs.handlers 1.0
+
+Item {
+ id: root
+ 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
+
+ DragHandler {
+ id: dragHandler
+ objectName: label.text + " DragHandler"
+ target: knob
+ xAxis.enabled: false
+ yAxis.minimum: slot.y
+ yAxis.maximum: slot.height + slot.y - knob.height
+ }
+
+ 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 {
+ // RectangularGlow is better, but that's a different module
+ 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
+ }
+ }
+ Image {
+ id: knob
+ source: "../resources/mixer-knob.png"
+ antialiasing: true
+ x: slot.x - width / 2 + slot.width / 2
+ height: root.width / 2
+ width: implicitWidth / implicitHeight * height
+ 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 }
+ 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
+ }
+
+ onHeightChanged: {
+ knob.programmatic = true
+ knob.setValue(root.value)
+ knob.programmatic = false
+ }
+}