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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Quick Extras module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
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**
**
****************************************************************************/
import QtQuick 2.0
import QtGraphicalEffects 1.0
import QtQuick.Controls.Styles 1.4
import QtQuick.Controls.Private 1.0
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: Settings.styleComponent(Settings.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);
}
}
}
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