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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 2.2
import QtQuick.Controls 1.4
import QtQuick.Controls.Styles 1.4
import QtQuick.Controls.Private 1.0
import QtQuick.Extras 1.4
import QtQuick.Extras.Private 1.0
/*!
\qmltype Dial
\inqmlmodule QtQuick.Extras
\since 5.5
\ingroup extras
\ingroup extras-interactive
\brief A circular dial that is rotated to set a value.
\image dial.png A Dial
The Dial is similar to a traditional dial knob that is found on devices
such as stereos or industrial equipment. It allows the user to specify a
value within a range.
Like CircularGauge, Dial can display tickmarks to give an indication of
the current value. When a suitable stepSize is combined with
\l {DialStyle::}{tickmarkStepSize},
the dial "snaps" to each tickmark.
You can create a custom appearance for a Dial by assigning a
\l {DialStyle}.
*/
Control {
id: dial
activeFocusOnTab: true
style: Settings.styleComponent(Settings.style, "DialStyle.qml", dial)
/*!
\qmlproperty real Dial::value
The angle of the handle along the dial, in the range of
\c 0.0 to \c 1.0.
The default value is \c{0.0}.
*/
property alias value: range.value
/*!
\qmlproperty real Dial::minimumValue
The smallest value allowed by the dial.
The default value is \c{0.0}.
\sa value, maximumValue
*/
property alias minimumValue: range.minimumValue
/*!
\qmlproperty real Dial::maximumValue
The largest value allowed by the dial.
The default value is \c{1.0}.
\sa value, minimumValue
*/
property alias maximumValue: range.maximumValue
/*!
\qmlproperty real Dial::hovered
This property holds whether the button is being hovered.
*/
readonly property alias hovered: mouseArea.containsMouse
/*!
\qmlproperty real Dial::stepSize
The default value is \c{0.0}.
*/
property alias stepSize: range.stepSize
/*!
\internal
Determines whether the dial can be freely rotated past the zero marker.
The default value is \c false.
*/
property bool __wrap: false
/*!
This property specifies whether the dial should gain active focus when
pressed.
The default value is \c false.
\sa pressed
*/
property bool activeFocusOnPress: false
/*!
\qmlproperty bool Dial::pressed
Returns \c true if the dial is pressed.
\sa activeFocusOnPress
*/
readonly property alias pressed: mouseArea.pressed
/*!
This property determines whether or not the dial displays tickmarks,
minor tickmarks, and labels.
For more fine-grained control over what is displayed, the following
style components of
\l {DialStyle} can be used:
\list
\li \l {DialStyle::}{tickmark}
\li \l {DialStyle::}{minorTickmark}
\li \l {DialStyle::}{tickmarkLabel}
\endlist
The default value is \c true.
*/
property bool tickmarksVisible: true
Keys.onLeftPressed: value -= stepSize
Keys.onDownPressed: value -= stepSize
Keys.onRightPressed: value += stepSize
Keys.onUpPressed: value += stepSize
Keys.onPressed: {
if (event.key === Qt.Key_Home) {
value = minimumValue;
event.accepted = true;
} else if (event.key === Qt.Key_End) {
value = maximumValue;
event.accepted = true;
}
}
RangeModel {
id: range
minimumValue: 0.0
maximumValue: 1.0
stepSize: 0
value: 0
}
MouseArea {
id: mouseArea
hoverEnabled: true
parent: __panel.background.parent
anchors.fill: parent
onPositionChanged: {
if (pressed) {
value = valueFromPoint(mouseX, mouseY);
}
}
onPressed: {
if (!__style.__dragToSet)
value = valueFromPoint(mouseX, mouseY);
if (activeFocusOnPress)
dial.forceActiveFocus();
}
function bound(val) { return Math.max(minimumValue, Math.min(maximumValue, val)); }
function valueFromPoint(x, y)
{
var yy = height / 2.0 - y;
var xx = x - width / 2.0;
var angle = (xx || yy) ? Math.atan2(yy, xx) : 0;
if (angle < Math.PI/ -2)
angle = angle + Math.PI * 2;
var range = maximumValue - minimumValue;
var value;
if (__wrap)
value = (minimumValue + range * (Math.PI * 3 / 2 - angle) / (2 * Math.PI));
else
value = (minimumValue + range * (Math.PI * 4 / 3 - angle) / (Math.PI * 10 / 6));
return bound(value)
}
}
}
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