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+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick Extras module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.0
+import QtGraphicalEffects 1.0
+import QtQuick.Controls.Private 1.0
+import QtQuick.Extras.Styles 1.3
+import QtQuick.Extras.Private 1.1
+import QtQuick.Extras.Private.CppUtils 1.0
+
+Control {
+ id: root
+ x: handleArea.centerOfHandle.x - width / 2
+ y: handleArea.centerOfHandle.y - height / 2
+
+ style: Qt.createComponent(StyleSettings.style + "/HandleStyle.qml", root)
+
+ /*!
+ The angle of the handle along the circumference of \l rotationRadius in
+ radians, scaled to be in the range of 0.0 to 1.0.
+ */
+ property alias value: range.value
+
+ RangeModel {
+ id: range
+ minimumValue: 0.0
+ maximumValue: 1.0
+ stepSize: 0
+ value: minimumValue
+ }
+
+ /*!
+ The angle in radians where the dial starts.
+ */
+ property real zeroAngle: 0
+
+ /*!
+ The radius of the rotation of this handle.
+ */
+ property real rotationRadius: 50
+
+ /*!
+ The center of the dial. This is the origin point for the handle's
+ rotation.
+ */
+ property real dialXCenter: 0
+ property real dialYCenter: 0
+
+ /*!
+ This property holds the amount of extra room added to each side of
+ the handle to make it easier to drag on touch devices.
+ */
+ property real allowance: Math.max(width, height) * 1.5
+
+ /*
+ The function used to determine the handle's value from the position of
+ the mouse.
+
+ Can be set to provide custom value calculation. It expects these
+ parameters: \c mouseX, \c mouseY, \c xCenter, \c yCenter, \c zeroAngle
+ */
+ property var valueFromMouse: handleArea.valueFromMouse
+
+ property alias handleArea: handleArea
+
+ MouseArea {
+ id: handleArea
+ // Respond to value changes by calculating the new center of the handle.
+ property point centerOfHandle: MathUtils.centerAlongCircle(dialXCenter, dialYCenter,
+ 0, 0, MathUtils.valueToAngle(value, 1, zeroAngle), rotationRadius);
+
+ anchors.fill: parent
+ anchors.margins: -allowance
+
+ onPositionChanged: {
+ // Whenever the handle is moved with the mouse, update the value.
+ value = root.valueFromMouse(mouse.x + centerOfHandle.x - allowance,
+ mouse.y + centerOfHandle.y - allowance, dialXCenter, dialYCenter, zeroAngle);
+ }
+
+ // A helper function for onPositionChanged.
+ function valueFromMouse(mouseX, mouseY, xCenter, yCenter, zeroAngle) {
+ return MathUtils.angleToValue(
+ MathUtils.halfPi - Math.atan2(mouseX - xCenter, mouseY - yCenter), 1, zeroAngle);
+ }
+ }
+}