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

source code of qtbase/examples/opengl/qopenglwidget/mainwindow.cpp