1 // SPDX-License-Identifier: GPL-3.0-or-later
2 // SPDX-FileCopyrightText: 2017-2019 Alejandro Sirgo Rica & Contributors
3
4 #include "colorpicker.h"
5 #include "src/utils/confighandler.h"
6 #include "src/utils/globalvalues.h"
7 #include <QMouseEvent>
8 #include <QPainter>
9
ColorPicker(QWidget * parent)10 ColorPicker::ColorPicker(QWidget* parent)
11 : QWidget(parent)
12 {
13 ConfigHandler config;
14 m_colorList = config.getUserColors();
15 m_colorAreaSize = GlobalValues::buttonBaseSize() * 0.6;
16 setMouseTracking(true);
17 // save the color values in member variables for faster access
18 m_uiColor = config.uiMainColorValue();
19 m_drawColor = config.drawColorValue();
20 // extraSize represents the extra space needed for the highlight of the
21 // selected color.
22 const int extraSize = 6;
23 double radius = (m_colorList.size() * m_colorAreaSize / 1.3) / 3.141592;
24 resize(radius * 2 + m_colorAreaSize + extraSize,
25 radius * 2 + m_colorAreaSize + extraSize);
26 double degree = 360 / (m_colorList.size());
27 double degreeAcum = degree;
28 // this line is the radius of the circle which will be rotated to add
29 // the color components.
30 QLineF baseLine =
31 QLineF(QPoint(radius + extraSize / 2, radius + extraSize / 2),
32 QPoint(radius * 2, radius));
33
34 for (int i = 0; i < m_colorList.size(); ++i) {
35 m_colorAreaList.append(QRect(
36 baseLine.x2(), baseLine.y2(), m_colorAreaSize, m_colorAreaSize));
37 baseLine.setAngle(degreeAcum);
38 degreeAcum += degree;
39 }
40 }
41
show()42 void ColorPicker::show()
43 {
44 grabMouse();
45 QWidget::show();
46 }
47
hide()48 void ColorPicker::hide()
49 {
50 releaseMouse();
51 QWidget::hide();
52 }
53
paintEvent(QPaintEvent *)54 void ColorPicker::paintEvent(QPaintEvent*)
55 {
56 QPainter painter(this);
57 painter.setRenderHint(QPainter::Antialiasing);
58
59 QVector<QRect> rects = handleMask();
60 painter.setPen(QColor(Qt::black));
61 for (int i = 0; i < rects.size(); ++i) {
62 // draw the highlight when we have to draw the selected color
63 if (m_drawColor == QColor(m_colorList.at(i))) {
64 QColor c = QColor(m_uiColor);
65 c.setAlpha(155);
66 painter.setBrush(c);
67 c.setAlpha(100);
68 painter.setPen(c);
69 QRect highlight = rects.at(i);
70 highlight.moveTo(highlight.x() - 3, highlight.y() - 3);
71 highlight.setHeight(highlight.height() + 6);
72 highlight.setWidth(highlight.width() + 6);
73 painter.drawRoundedRect(highlight, 100, 100);
74 painter.setPen(QColor(Qt::black));
75 }
76
77 // draw available colors
78 if (m_colorList.at(i).isValid()) {
79 // draw preset color
80 painter.setBrush(QColor(m_colorList.at(i)));
81 painter.drawRoundedRect(rects.at(i), 100, 100);
82 } else {
83 // draw rainbow (part) for custom color
84 QRect lastRect = rects.at(i);
85 int nStep = 1;
86 int nSteps = lastRect.height() / nStep;
87 // 0.02 - start rainbow color, 0.33 - end rainbow color from range:
88 // 0.0 - 1.0
89 float h = 0.02;
90 for (int radius = nSteps; radius > 0; radius -= nStep * 2) {
91 // calculate color
92 float fHStep = (0.33 - h) / (nSteps / nStep / 2);
93 QColor color = QColor::fromHslF(h, 0.95, 0.5);
94
95 // set color and draw circle
96 painter.setPen(color);
97 painter.setBrush(color);
98 painter.drawRoundedRect(lastRect, 100, 100);
99
100 // set next color, circle geometry
101 h += fHStep;
102 lastRect.setX(lastRect.x() + nStep);
103 lastRect.setY(lastRect.y() + nStep);
104 lastRect.setHeight(lastRect.height() - nStep);
105 lastRect.setWidth(lastRect.width() - nStep);
106 }
107 }
108 }
109 }
110
mouseMoveEvent(QMouseEvent * e)111 void ColorPicker::mouseMoveEvent(QMouseEvent* e)
112 {
113 for (int i = 0; i < m_colorList.size(); ++i) {
114 if (m_colorAreaList.at(i).contains(e->pos())) {
115 m_drawColor = m_colorList.at(i);
116 emit colorSelected(m_drawColor);
117 update();
118 break;
119 }
120 }
121 }
122
handleMask() const123 QVector<QRect> ColorPicker::handleMask() const
124 {
125 QVector<QRect> areas;
126 for (const QRect& rect : m_colorAreaList) {
127 areas.append(rect);
128 }
129 return areas;
130 }
131