summaryrefslogtreecommitdiff
path: root/src/extras/Styles/Flat/CircularGaugeStyle.qml
blob: 64eb176ddc2adfb24ae6347a47ff7ac4339c5adb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Quick Extras module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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.
**
** 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.LGPL3 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-3.0.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 (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.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
            function onValueChanged() { thickArc.requestPaint() }
            function onMinimumValueChanged() { thickArc.requestPaint() }
            function onMaximumValueChanged() { thickArc.requestPaint() }
            function 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
    }
}