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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "mainwindow.h"
#include <QApplication>
#include <QMenuBar>
#include <QGroupBox>
#include <QSlider>
#include <QLabel>
#include <QCheckBox>
#include <QRandomGenerator>
#include <QSpinBox>
#include <QScrollArea>
#include <QTabWidget>
#include <QTabBar>
#include <QToolButton>
#include "glwidget.h"
MainWindow::MainWindow()
: m_nextX(1), m_nextY(1)
{
GLWidget *glwidget = new GLWidget(this, qRgb(20, 20, 50));
m_glWidgets << glwidget;
QLabel *label = new QLabel(this);
m_timer = new QTimer(this);
QSlider *slider = new QSlider(this);
slider->setOrientation(Qt::Horizontal);
QLabel *updateLabel = new QLabel("Update interval");
QSpinBox *updateInterval = new QSpinBox(this);
updateInterval->setSuffix(" ms");
updateInterval->setValue(10);
updateInterval->setToolTip("Interval for the timer that calls update().\n"
"Note that on most systems the swap will block to wait for vsync\n"
"and therefore an interval < 16 ms will likely lead to a 60 FPS update rate.");
QGroupBox *updateGroupBox = new QGroupBox(this);
QCheckBox *timerBased = new QCheckBox("Use timer", this);
timerBased->setChecked(false);
timerBased->setToolTip("Toggles using a timer to trigger update().\n"
"When not set, each paintGL() schedules the next update immediately,\n"
"expecting the blocking swap to throttle the thread.\n"
"This shows how unnecessary the timer is in most cases.");
QCheckBox *transparent = new QCheckBox("Transparent background", this);
transparent->setToolTip("Toggles Qt::WA_AlwaysStackOnTop and transparent clear color for glClear().\n"
"Note how the button on top stacks incorrectly when enabling this.");
QHBoxLayout *updateLayout = new QHBoxLayout;
updateLayout->addWidget(updateLabel);
updateLayout->addWidget(updateInterval);
updateLayout->addWidget(timerBased);
updateLayout->addWidget(transparent);
updateGroupBox->setLayout(updateLayout);
slider->setRange(0, 50);
slider->setSliderPosition(30);
m_timer->setInterval(10);
label->setText("A scrollable QOpenGLWidget");
label->setAlignment(Qt::AlignHCenter);
QGroupBox * groupBox = new QGroupBox(this);
setCentralWidget(groupBox);
groupBox->setTitle("QOpenGLWidget Example");
m_layout = new QGridLayout(groupBox);
QScrollArea *scrollArea = new QScrollArea;
scrollArea->setWidget(glwidget);
m_layout->addWidget(scrollArea,1,0,8,1);
m_layout->addWidget(label,9,0,1,1);
m_layout->addWidget(updateGroupBox, 10, 0, 1, 1);
m_layout->addWidget(slider, 11,0,1,1);
groupBox->setLayout(m_layout);
QMenu *fileMenu = menuBar()->addMenu("&File");
fileMenu->addAction("E&xit", this, &QWidget::close);
QMenu *showMenu = menuBar()->addMenu("&Show");
showMenu->addAction("Show 3D Logo", glwidget, &GLWidget::setLogo);
showMenu->addAction("Show 2D Texture", glwidget, &GLWidget::setTexture);
QAction *showBubbles = showMenu->addAction("Show bubbles", glwidget, &GLWidget::setShowBubbles);
showBubbles->setCheckable(true);
showBubbles->setChecked(true);
showMenu->addAction("Open tab window", this, &MainWindow::showNewWindow);
QMenu *helpMenu = menuBar()->addMenu("&Help");
helpMenu->addAction("About Qt", qApp, &QApplication::aboutQt);
connect(m_timer, &QTimer::timeout, glwidget, QOverload<>::of(&QWidget::update));
connect(slider, &QAbstractSlider::valueChanged, glwidget, &GLWidget::setScaling);
connect(transparent, &QCheckBox::toggled, glwidget, &GLWidget::setTransparent);
connect(updateInterval, &QSpinBox::valueChanged,
this, &MainWindow::updateIntervalChanged);
connect(timerBased, &QCheckBox::toggled, this, &MainWindow::timerUsageChanged);
connect(timerBased, &QCheckBox::toggled, updateInterval, &QWidget::setEnabled);
if (timerBased->isChecked())
m_timer->start();
else
updateInterval->setEnabled(false);
}
void MainWindow::updateIntervalChanged(int value)
{
m_timer->setInterval(value);
if (m_timer->isActive())
m_timer->start();
}
void MainWindow::addNew()
{
if (m_nextY == 4)
return;
GLWidget *w = new GLWidget(nullptr, qRgb(QRandomGenerator::global()->bounded(256),
QRandomGenerator::global()->bounded(256),
QRandomGenerator::global()->bounded(256)));
m_glWidgets << w;
connect(m_timer, &QTimer::timeout, w, QOverload<>::of(&QWidget::update));
m_layout->addWidget(w, m_nextY, m_nextX, 1, 1);
if (m_nextX == 3) {
m_nextX = 1;
++m_nextY;
} else {
++m_nextX;
}
}
void MainWindow::timerUsageChanged(bool enabled)
{
if (enabled) {
m_timer->start();
} else {
m_timer->stop();
for (QOpenGLWidget *w : std::as_const(m_glWidgets))
w->update();
}
}
void MainWindow::resizeEvent(QResizeEvent *)
{
m_glWidgets[0]->setMinimumSize(size() + QSize(128, 128));
}
void MainWindow::showNewWindow()
{
QTabWidget *tabs = new QTabWidget;
tabs->resize(800, 600);
QToolButton *tb = new QToolButton;
tb->setText(QLatin1String("+"));
tabs->addTab(new QLabel(QLatin1String("Add OpenGL widgets with +")), QString());
tabs->setTabEnabled(0, false);
tabs->tabBar()->setTabButton(0, QTabBar::RightSide, tb);
tabs->tabBar()->setTabsClosable(true);
QObject::connect(tabs->tabBar(), &QTabBar::tabCloseRequested, tabs, [tabs](int index) {
tabs->widget(index)->deleteLater();
});
const QString msgToTopLevel = QLatin1String("Break out to top-level window");
const QString msgFromTopLevel = QLatin1String("Move back under tab widget");
QObject::connect(tb, &QAbstractButton::clicked, tabs, [=] {
GLWidget *glwidget = new GLWidget(nullptr, Qt::blue);
glwidget->resize(tabs->size());
glwidget->setWindowTitle(QString::asprintf("QOpenGLWidget %p", glwidget));
QPushButton *btn = new QPushButton(msgToTopLevel, glwidget);
connect(btn, &QPushButton::clicked, glwidget, [=] {
if (glwidget->parent()) {
glwidget->setAttribute(Qt::WA_DeleteOnClose, true);
glwidget->setParent(nullptr);
glwidget->show();
btn->setText(msgFromTopLevel);
} else {
glwidget->setAttribute(Qt::WA_DeleteOnClose, false);
tabs->addTab(glwidget, glwidget->windowTitle());
btn->setText(msgToTopLevel);
}
});
tabs->setCurrentIndex(tabs->addTab(glwidget, glwidget->windowTitle()));
});
tabs->setAttribute(Qt::WA_DeleteOnClose);
tabs->show();
}
|
