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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.Styles 1.4 as Base
import QtQuick.Controls.Styles.Flat 1.0
import QtQuick.Extras.Private 1.0
import QtQuick.Extras.Private.CppUtils 1.1
Base.CircularGaugeStyle {
id: circularGaugeStyle
tickmarkInset: __thickArcTickmarklessMargin + __thickArcLineWidth / 2 - __tickmarkLength / 2
minorTickmarkInset: __thickArcTickmarklessMargin + __thickArcLineWidth / 2 - (__tickmarkLength / 2) / 2
labelInset: Math.max(textMetrics.width, textMetrics.height) / 2
// A stroked arc starts losing its shape when it is very thick, so prevent that from happening.
readonly property real __thickArcLineWidth: Math.min(22 * FlatStyle.scaleFactor, Math.round(outerRadius * 0.2))
readonly property real __thickArcTickmarklessMargin: labelInset * 2
readonly property real __tickmarkLength: __thickArcLineWidth * 0.5
readonly property real __tickmarkWidth: FlatStyle.onePixel
readonly property real __fontSize: Math.max(6, __protectedScope.toPixels(0.12))
// TODO: add this to Utils or something; it's not specific to this control
readonly property real __antialiasingAdjustment: FlatStyle.onePixel
Text {
id: textMetrics
font.pixelSize: __fontSize
text: control.maximumValue.toFixed(0)
visible: false
}
background: Item {
implicitWidth: Math.round(160 * FlatStyle.scaleFactor)
implicitHeight: Math.round(160 * FlatStyle.scaleFactor)
readonly property real thinArcLineWidth: FlatStyle.onePixel
readonly property bool tickmarklessVariant: false
readonly property real arcDistance: thinArcLineWidth * 3
Connections {
target: control
onValueChanged: thickArc.requestPaint()
onMinimumValueChanged: thickArc.requestPaint()
onMaximumValueChanged: thickArc.requestPaint()
onEnabledChanged: {
thickArc.requestPaint();
thinArc.requestPaint();
}
}
// TODO: test performance of this on the Pi
Canvas {
id: thickArc
anchors.fill: parent
anchors.margins: Math.floor(tickmarklessVariant ? arcDistance : __thickArcTickmarklessMargin)
onPaint: {
var ctx = getContext("2d");
ctx.reset();
ctx.lineWidth = __thickArcLineWidth;
var radius = Math.floor(width / 2 - ctx.lineWidth / 2 - __antialiasingAdjustment);
if (radius < 0)
return;
ctx.beginPath();
ctx.globalAlpha = control.enabled ? 1 : 0.2;
ctx.strokeStyle = control.enabled ? FlatStyle.styleColor : FlatStyle.disabledColor;
var startAngle = MathUtils.degToRad(minimumValueAngle - 90);
var endAngle = MathUtils.degToRad(needleRotation - 90);
ctx.arc(Math.floor(width / 2), Math.floor(height / 2), radius, startAngle, endAngle, false);
ctx.stroke();
}
}
Canvas {
id: thinArc
anchors.fill: parent
anchors.margins: Math.floor(tickmarklessVariant ? 0 : thickArc.anchors.margins + __thickArcLineWidth + arcDistance)
onPaint: {
var ctx = getContext("2d");
ctx.reset();
ctx.lineWidth = thinArcLineWidth;
var radius = width / 2 - ctx.lineWidth / 2 - __antialiasingAdjustment;
if (radius < 0)
return;
ctx.beginPath();
ctx.globalAlpha = control.enabled ? 1 : 0.2;
ctx.strokeStyle = control.enabled ? FlatStyle.styleColor : FlatStyle.disabledColor;
var startAngle = MathUtils.degToRad(minimumValueAngle - 90);
var endAngle = MathUtils.degToRad(maximumValueAngle - 90);
ctx.arc(Math.floor(width / 2), Math.floor(height / 2), radius, startAngle, endAngle, false);
ctx.stroke();
}
}
}
needle: null
foreground: null
tickmark: Rectangle {
implicitWidth: __tickmarkWidth
implicitHeight: __tickmarkLength
antialiasing: true
color: control.value < styleData.value || isEdgeTickmark ? (control.enabled ? FlatStyle.styleColor : FlatStyle.disabledColor) : FlatStyle.selectedTextColor
opacity: control.value < styleData.value || isEdgeTickmark ? (control.enabled ? 1 : 0.2) : 0.5
visible: (!isEdgeTickmark) || (control.value < styleData.value)
|| (styleData.value === control.minimumValue && control.value === control.minimumValue)
readonly property bool isEdgeTickmark: styleData.value === control.minimumValue || styleData.value === control.maximumValue
}
minorTickmark: Rectangle {
implicitWidth: __tickmarkWidth
implicitHeight: __tickmarkLength / 2
antialiasing: true
color: control.enabled ? FlatStyle.styleColor : FlatStyle.disabledColor
visible: control.value < styleData.value
opacity: control.enabled ? 1 : 0.2
}
tickmarkLabel: Text {
font.pixelSize: __fontSize
text: styleData.value
color: control.enabled ? FlatStyle.defaultTextColor : FlatStyle.disabledColor
opacity: control.enabled ? 1 : FlatStyle.disabledOpacity
antialiasing: true
horizontalAlignment: Text.AlignHCenter
verticalAlignment: Text.AlignVCenter
}
}
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