124 lines
4.5 KiB
QML
124 lines
4.5 KiB
QML
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the Qt Quick Extras module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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import QtQuick 2.0
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import QtGraphicalEffects 1.0
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import QtQuick.Controls.Styles 1.4
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import QtQuick.Controls.Private 1.0
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import QtQuick.Extras.Private 1.1
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import QtQuick.Extras.Private.CppUtils 1.0
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Control {
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id: root
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x: handleArea.centerOfHandle.x - width / 2
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y: handleArea.centerOfHandle.y - height / 2
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style: Settings.styleComponent(Settings.style, "HandleStyle.qml", root)
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/*!
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The angle of the handle along the circumference of \l rotationRadius in
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radians, scaled to be in the range of 0.0 to 1.0.
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*/
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property alias value: range.value
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RangeModel {
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id: range
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minimumValue: 0.0
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maximumValue: 1.0
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stepSize: 0
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value: minimumValue
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}
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/*!
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The angle in radians where the dial starts.
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*/
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property real zeroAngle: 0
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/*!
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The radius of the rotation of this handle.
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*/
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property real rotationRadius: 50
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/*!
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The center of the dial. This is the origin point for the handle's
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rotation.
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*/
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property real dialXCenter: 0
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property real dialYCenter: 0
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/*!
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This property holds the amount of extra room added to each side of
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the handle to make it easier to drag on touch devices.
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*/
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property real allowance: Math.max(width, height) * 1.5
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/*
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The function used to determine the handle's value from the position of
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the mouse.
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Can be set to provide custom value calculation. It expects these
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parameters: \c mouseX, \c mouseY, \c xCenter, \c yCenter, \c zeroAngle
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*/
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property var valueFromMouse: handleArea.valueFromMouse
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property alias handleArea: handleArea
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MouseArea {
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id: handleArea
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// Respond to value changes by calculating the new center of the handle.
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property point centerOfHandle: MathUtils.centerAlongCircle(dialXCenter, dialYCenter,
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0, 0, MathUtils.valueToAngle(value, 1, zeroAngle), rotationRadius);
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anchors.fill: parent
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anchors.margins: -allowance
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onPositionChanged: {
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// Whenever the handle is moved with the mouse, update the value.
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value = root.valueFromMouse(mouse.x + centerOfHandle.x - allowance,
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mouse.y + centerOfHandle.y - allowance, dialXCenter, dialYCenter, zeroAngle);
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}
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// A helper function for onPositionChanged.
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function valueFromMouse(mouseX, mouseY, xCenter, yCenter, zeroAngle) {
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return MathUtils.angleToValue(
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MathUtils.halfPi - Math.atan2(mouseX - xCenter, mouseY - yCenter), 1, zeroAngle);
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}
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}
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}
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