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50
51 #include "mainwindow.h"
52
53 #include <QApplication>
54 #include <QMenuBar>
55 #include <QGroupBox>
56 #include <QSlider>
57 #include <QLabel>
58 #include <QCheckBox>
59 #include <QRandomGenerator>
60 #include <QSpinBox>
61 #include <QScrollArea>
62
63 #include "glwidget.h"
64
MainWindow()65 MainWindow::MainWindow()
66 : m_nextX(1), m_nextY(1)
67 {
68 setWindowState(Qt::WindowMaximized);
69 setWindowFlags(Qt::FramelessWindowHint | Qt::WindowTitleHint | Qt::WindowCloseButtonHint);
70 GLWidget *glwidget = new GLWidget(this, true, qRgb(20, 20, 50));
71 m_glWidgets << glwidget;
72 QLabel *label = new QLabel(this);
73 m_timer = new QTimer(this);
74 QSlider *slider = new QSlider(this);
75 slider->setOrientation(Qt::Horizontal);
76
77 QLabel *updateLabel = new QLabel("Update interval");
78 QSpinBox *updateInterval = new QSpinBox(this);
79 updateInterval->setSuffix(" ms");
80 updateInterval->setValue(10);
81 updateInterval->setToolTip("Interval for the timer that calls update().\n"
82 "Note that on most systems the swap will block to wait for vsync\n"
83 "and therefore an interval < 16 ms will likely lead to a 60 FPS update rate.");
84 QGroupBox *updateGroupBox = new QGroupBox(this);
85 QCheckBox *timerBased = new QCheckBox("Use timer", this);
86 timerBased->setChecked(false);
87 timerBased->setToolTip("Toggles using a timer to trigger update().\n"
88 "When not set, each paintGL() schedules the next update immediately,\n"
89 "expecting the blocking swap to throttle the thread.\n"
90 "This shows how unnecessary the timer is in most cases.");
91 QCheckBox *transparent = new QCheckBox("Transparent background", this);
92 transparent->setToolTip("Toggles Qt::WA_AlwaysStackOnTop and transparent clear color for glClear().\n"
93 "Note how the button on top stacks incorrectly when enabling this.");
94 QHBoxLayout *updateLayout = new QHBoxLayout;
95 updateLayout->addWidget(updateLabel);
96 updateLayout->addWidget(updateInterval);
97 updateLayout->addWidget(timerBased);
98 updateLayout->addWidget(transparent);
99 updateGroupBox->setLayout(updateLayout);
100
101 slider->setRange(0, 50);
102 slider->setSliderPosition(30);
103 m_timer->setInterval(10);
104 label->setText("A scrollable QOpenGLWidget");
105 label->setAlignment(Qt::AlignHCenter);
106
107 QGroupBox * groupBox = new QGroupBox(this);
108 setCentralWidget(groupBox);
109 groupBox->setTitle("QOpenGLWidget Example");
110
111 m_layout = new QGridLayout(groupBox);
112
113 QScrollArea *scrollArea = new QScrollArea;
114 scrollArea->setWidget(glwidget);
115
116 QPushButton *exitBtn = new QPushButton(this);
117 QPalette pal;
118 pal.setColor(QPalette::Button, Qt::red);
119 exitBtn->setText(tr("Exit"));
120 exitBtn->resize(100, 100);
121 exitBtn->setPalette(pal);
122 connect(exitBtn, &QPushButton::clicked, this, [=](){
123 close();
124 });
125
126 m_layout->addWidget(scrollArea,1,0,8,1);
127 m_layout->addWidget(label,9,0,1,1);
128 m_layout->addWidget(updateGroupBox, 10, 0, 1, 1);
129 m_layout->addWidget(slider, 11,0,1,1);
130 m_layout->addWidget(exitBtn, 12, 0, 1, 1);
131
132 groupBox->setLayout(m_layout);
133
134
135 QMenu *fileMenu = menuBar()->addMenu("&File");
136 fileMenu->addAction("E&xit", this, &QWidget::close);
137 QMenu *showMenu = menuBar()->addMenu("&Show");
138 showMenu->addAction("Show 3D Logo", glwidget, &GLWidget::setLogo);
139 showMenu->addAction("Show 2D Texture", glwidget, &GLWidget::setTexture);
140 QAction *showBubbles = showMenu->addAction("Show bubbles", glwidget, &GLWidget::setShowBubbles);
141 showBubbles->setCheckable(true);
142 showBubbles->setChecked(true);
143 QMenu *helpMenu = menuBar()->addMenu("&Help");
144 helpMenu->addAction("About Qt", qApp, &QApplication::aboutQt);
145
146 connect(m_timer, &QTimer::timeout, glwidget, QOverload<>::of(&QWidget::update));
147
148 connect(slider, &QAbstractSlider::valueChanged, glwidget, &GLWidget::setScaling);
149 connect(transparent, &QCheckBox::toggled, glwidget, &GLWidget::setTransparent);
150 connect(updateInterval, QOverload<int>::of(&QSpinBox::valueChanged),
151 this, &MainWindow::updateIntervalChanged);
152 connect(timerBased, &QCheckBox::toggled, this, &MainWindow::timerUsageChanged);
153 connect(timerBased, &QCheckBox::toggled, updateInterval, &QWidget::setEnabled);
154
155 if (timerBased->isChecked())
156 m_timer->start();
157 else
158 updateInterval->setEnabled(false);
159 }
160
updateIntervalChanged(int value)161 void MainWindow::updateIntervalChanged(int value)
162 {
163 m_timer->setInterval(value);
164 if (m_timer->isActive())
165 m_timer->start();
166 }
167
addNew()168 void MainWindow::addNew()
169 {
170 if (m_nextY == 4)
171 return;
172 GLWidget *w = new GLWidget(this, false, qRgb(QRandomGenerator::global()->bounded(256),
173 QRandomGenerator::global()->bounded(256),
174 QRandomGenerator::global()->bounded(256)));
175 m_glWidgets << w;
176 connect(m_timer, &QTimer::timeout, w, QOverload<>::of(&QWidget::update));
177 m_layout->addWidget(w, m_nextY, m_nextX, 1, 1);
178 if (m_nextX == 3) {
179 m_nextX = 1;
180 ++m_nextY;
181 } else {
182 ++m_nextX;
183 }
184 }
185
timerUsageChanged(bool enabled)186 void MainWindow::timerUsageChanged(bool enabled)
187 {
188 if (enabled) {
189 m_timer->start();
190 } else {
191 m_timer->stop();
192 foreach (QOpenGLWidget *w, m_glWidgets)
193 w->update();
194 }
195 }
196
resizeEvent(QResizeEvent *)197 void MainWindow::resizeEvent(QResizeEvent *)
198 {
199 m_glWidgets[0]->setMinimumSize(size() + QSize(128, 128));
200 }
201