1 // SPDX-License-Identifier: GPL-3.0-or-later
2 // SPDX-FileCopyrightText: 2017-2019 Alejandro Sirgo Rica & Contributors
3
4 #include "sidepanelwidget.h"
5 #include "src/core/qguiappcurrentscreen.h"
6 #include "src/utils/colorutils.h"
7 #include "src/utils/pathinfo.h"
8 #include <QFormLayout>
9 #include <QKeyEvent>
10 #include <QLabel>
11 #include <QPushButton>
12 #include <QSlider>
13 #include <QVBoxLayout>
14 #if defined(Q_OS_MACOS)
15 #include <QScreen>
16 #endif
17
18 class QColorPickingEventFilter : public QObject
19 {
20 public:
QColorPickingEventFilter(SidePanelWidget * pw,QObject * parent=nullptr)21 explicit QColorPickingEventFilter(SidePanelWidget* pw,
22 QObject* parent = nullptr)
23 : QObject(parent)
24 , m_pw(pw)
25 {}
26
eventFilter(QObject *,QEvent * event)27 bool eventFilter(QObject*, QEvent* event) override
28 {
29 event->accept();
30 switch (event->type()) {
31 case QEvent::MouseMove:
32 return m_pw->handleMouseMove(static_cast<QMouseEvent*>(event));
33 case QEvent::MouseButtonPress:
34 return m_pw->handleMouseButtonPressed(
35 static_cast<QMouseEvent*>(event));
36 case QEvent::KeyPress:
37 return m_pw->handleKeyPress(static_cast<QKeyEvent*>(event));
38 default:
39 break;
40 }
41 return false;
42 }
43
44 private:
45 SidePanelWidget* m_pw;
46 };
47
48 ////////////////////////
49
SidePanelWidget(QPixmap * p,QWidget * parent)50 SidePanelWidget::SidePanelWidget(QPixmap* p, QWidget* parent)
51 : QWidget(parent)
52 , m_pixmap(p)
53 , m_eventFilter(nullptr)
54 {
55 m_layout = new QVBoxLayout(this);
56
57 QFormLayout* colorForm = new QFormLayout();
58 m_thicknessSlider = new QSlider(Qt::Horizontal);
59 m_thicknessSlider->setRange(1, 100);
60 m_thicknessSlider->setValue(m_thickness);
61 m_colorLabel = new QLabel();
62 m_colorLabel->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
63 colorForm->addRow(tr("Active thickness:"), m_thicknessSlider);
64 colorForm->addRow(tr("Active color:"), m_colorLabel);
65 m_layout->addLayout(colorForm);
66
67 connect(m_thicknessSlider,
68 &QSlider::valueChanged,
69 this,
70 &SidePanelWidget::updateCurrentThickness);
71 connect(this,
72 &SidePanelWidget::thicknessChanged,
73 this,
74 &SidePanelWidget::updateThickness);
75
76 QColor background = this->palette().window().color();
77 bool isDark = ColorUtils::colorIsDark(background);
78 QString modifier =
79 isDark ? PathInfo::whiteIconPath() : PathInfo::blackIconPath();
80 QIcon grabIcon(modifier + "colorize.svg");
81 m_colorGrabButton = new QPushButton(grabIcon, QLatin1String(""));
82 updateGrabButton(false);
83 connect(m_colorGrabButton,
84 &QPushButton::pressed,
85 this,
86 &SidePanelWidget::colorGrabberActivated);
87 m_layout->addWidget(m_colorGrabButton);
88
89 m_colorWheel = new color_widgets::ColorWheel(this);
90 m_colorWheel->setColor(m_color);
91 connect(m_colorWheel,
92 &color_widgets::ColorWheel::mouseReleaseOnColor,
93 this,
94 &SidePanelWidget::colorChanged);
95 connect(m_colorWheel,
96 &color_widgets::ColorWheel::colorChanged,
97 this,
98 &SidePanelWidget::updateColorNoWheel);
99 m_layout->addWidget(m_colorWheel);
100 }
101
updateColor(const QColor & c)102 void SidePanelWidget::updateColor(const QColor& c)
103 {
104 m_color = c;
105 m_colorLabel->setStyleSheet(
106 QStringLiteral("QLabel { background-color : %1; }").arg(c.name()));
107 m_colorWheel->setColor(m_color);
108 }
109
updateThickness(const int & t)110 void SidePanelWidget::updateThickness(const int& t)
111 {
112 m_thickness = qBound(0, t, 100);
113 m_thicknessSlider->setValue(m_thickness);
114 }
115
updateColorNoWheel(const QColor & c)116 void SidePanelWidget::updateColorNoWheel(const QColor& c)
117 {
118 m_color = c;
119 m_colorLabel->setStyleSheet(
120 QStringLiteral("QLabel { background-color : %1; }").arg(c.name()));
121 }
122
updateCurrentThickness(int value)123 void SidePanelWidget::updateCurrentThickness(int value)
124 {
125 emit thicknessChanged(value);
126 }
127
colorGrabberActivated()128 void SidePanelWidget::colorGrabberActivated()
129 {
130 grabKeyboard();
131 grabMouse(Qt::CrossCursor);
132 setMouseTracking(true);
133 m_colorBackup = m_color;
134 if (!m_eventFilter) {
135 m_eventFilter = new QColorPickingEventFilter(this, this);
136 }
137 installEventFilter(m_eventFilter);
138 updateGrabButton(true);
139 }
140
releaseColorGrab()141 void SidePanelWidget::releaseColorGrab()
142 {
143 setMouseTracking(false);
144 removeEventFilter(m_eventFilter);
145 releaseMouse();
146 releaseKeyboard();
147 setFocus();
148 updateGrabButton(false);
149 }
150
grabPixmapColor(const QPoint & p)151 QColor SidePanelWidget::grabPixmapColor(const QPoint& p)
152 {
153 QColor c;
154 if (m_pixmap) {
155 #if defined(Q_OS_MACOS)
156 QScreen* currentScreen = QGuiAppCurrentScreen().currentScreen();
157 QPoint point = p;
158 if (currentScreen) {
159 point = QPoint((p.x() - currentScreen->geometry().x()) *
160 currentScreen->devicePixelRatio(),
161 (p.y() - currentScreen->geometry().y()) *
162 currentScreen->devicePixelRatio());
163 }
164 QPixmap pixel = m_pixmap->copy(QRect(point, point));
165 #else
166 QPixmap pixel = m_pixmap->copy(QRect(p, p));
167 #endif
168 c = pixel.toImage().pixel(0, 0);
169 }
170 return c;
171 }
172
handleKeyPress(QKeyEvent * e)173 bool SidePanelWidget::handleKeyPress(QKeyEvent* e)
174 {
175 if (e->key() == Qt::Key_Escape) {
176 releaseColorGrab();
177 updateColor(m_colorBackup);
178 } else if (e->key() == Qt::Key_Return || e->key() == Qt::Key_Enter) {
179 updateColor(grabPixmapColor(QCursor::pos()));
180 releaseColorGrab();
181 emit colorChanged(m_color);
182 }
183 return true;
184 }
185
handleMouseButtonPressed(QMouseEvent * e)186 bool SidePanelWidget::handleMouseButtonPressed(QMouseEvent* e)
187 {
188 if (m_colorGrabButton->geometry().contains(e->pos()) ||
189 e->button() == Qt::RightButton) {
190 updateColorNoWheel(m_colorBackup);
191 } else if (e->button() == Qt::LeftButton) {
192 updateColor(grabPixmapColor(QCursor::pos()));
193 }
194 releaseColorGrab();
195 emit colorChanged(m_color);
196 return true;
197 }
198
handleMouseMove(QMouseEvent * e)199 bool SidePanelWidget::handleMouseMove(QMouseEvent* e)
200 {
201 updateColorNoWheel(grabPixmapColor(e->globalPos()));
202 return true;
203 }
204
updateGrabButton(const bool activated)205 void SidePanelWidget::updateGrabButton(const bool activated)
206 {
207 if (activated) {
208 m_colorGrabButton->setText(tr("Press ESC to cancel"));
209 } else {
210 m_colorGrabButton->setText(tr("Grab Color"));
211 }
212 }
213