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50
51#include "openglwindow.h"
52
53#include <QApplication>
54#include <QFocusEvent>
55#include <QHBoxLayout>
56#include <QKeyEvent>
57#include <QLineEdit>
58#include <QMouseEvent>
59#include <QPainter>
60#include <QWidget>
61
62
63// Making use of the class from the opengl example in gui.
64class Window : public OpenGLWindow
65{
66 Q_OBJECT
67public:
68 using OpenGLWindow::OpenGLWindow;
69
70 void render(QPainter *p) override
71 {
72 QLinearGradient g(0, 0, 0, height());
73 g.setColorAt(pos: 0, color: QColor("lightsteelblue"));
74 g.setColorAt(pos: 1, color: Qt::black);
75 p->fillRect(x: 0, y: 0, w: width(), h: height(), b: g);
76
77 p->setPen(Qt::white);
78
79 p->drawText(x: 20, y: 30, s: QLatin1String("This is an OpenGL based QWindow"));
80
81 if (m_key.trimmed().length() > 0) {
82 QRect bounds = p->boundingRect(rect: QRect(0, 0, width(), height()), flags: Qt::AlignTop | Qt::AlignLeft, text: m_key);
83 p->save();
84 p->translate(dx: width() / 2.0, dy: height() / 2.0);
85 p->scale(sx: 10, sy: 10);
86 p->translate(dx: -bounds.width() / 2.0, dy: -bounds.height() / 2.0);
87 p->drawText(r: bounds, flags: Qt::AlignCenter, text: m_key);
88 p->restore();
89 }
90
91 if (m_focus)
92 p->drawText(x: 20, y: height() - 20, s: QLatin1String("Window has focus!"));
93
94 p->setRenderHint(hint: QPainter::Antialiasing);
95 p->drawPolyline(polyline: m_polygon);
96 }
97
98 void mousePressEvent(QMouseEvent *e) override
99 {
100 if (!m_mouseDown) {
101 m_mouseDown = true;
102 m_polygon.clear();
103 m_polygon.append(t: e->pos());
104 renderLater();
105 }
106 }
107
108 void mouseMoveEvent(QMouseEvent *e) override
109 {
110 if (m_mouseDown) {
111 m_polygon.append(t: e->pos());
112 renderLater();
113 }
114 }
115
116 void mouseReleaseEvent(QMouseEvent *e) override
117 {
118 if (m_mouseDown) {
119 m_mouseDown = false;
120 m_polygon.append(t: e->pos());
121 renderLater();
122 }
123 }
124
125 void focusInEvent(QFocusEvent *) override
126 {
127 m_focus = true;
128 renderLater();
129 }
130
131 void focusOutEvent(QFocusEvent *) override
132 {
133 m_focus = false;
134 m_polygon.clear();
135 renderLater();
136 }
137
138 void keyPressEvent(QKeyEvent *e) override
139 {
140 m_key = e->text();
141 renderLater();
142 }
143
144 void keyReleaseEvent(QKeyEvent *) override
145 {
146 m_key = QString();
147 renderLater();
148 }
149private:
150 QPolygon m_polygon;
151 QString m_key;
152 bool m_mouseDown = false;
153 bool m_focus = false;
154};
155
156
157int main(int argc, char *argv[])
158{
159 QApplication app(argc, argv);
160
161 QWidget *widget = new QWidget;
162 QHBoxLayout *layout = new QHBoxLayout(widget);
163
164 Window *window = new Window;
165
166 QWidget *container = QWidget::createWindowContainer(window);
167 container->setMinimumSize(minw: 300, minh: 300);
168 container->setMaximumSize(maxw: 600, maxh: 600);
169 container->setSizePolicy(hor: QSizePolicy::Expanding, ver: QSizePolicy::Expanding);
170 container->setFocusPolicy(Qt::StrongFocus);
171
172 window->setGeometry(posx: 100, posy: 100, w: 300, h: 200);
173
174 layout->addWidget(new QLineEdit(QLatin1String("A QLineEdit")));
175 layout->addWidget(container);
176 layout->addWidget(new QLineEdit(QLatin1String("A QLabel")));
177
178 widget->show();
179
180 return app.exec();
181}
182
183#include "windowcontainer.moc"
184

source code of qtbase/examples/widgets/windowcontainer/windowcontainer.cpp