diff options
Diffstat (limited to 'src/extras/Private/Handle.qml')
-rw-r--r-- | src/extras/Private/Handle.qml | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/src/extras/Private/Handle.qml b/src/extras/Private/Handle.qml new file mode 100644 index 00000000..12e2804d --- /dev/null +++ b/src/extras/Private/Handle.qml @@ -0,0 +1,120 @@ +/**************************************************************************** +** +** 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); + } + } +} |