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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "openglwindow.h"
#include <QApplication>
#include <QFocusEvent>
#include <QHBoxLayout>
#include <QKeyEvent>
#include <QLineEdit>
#include <QMouseEvent>
#include <QPainter>
#include <QWidget>
// Making use of the class from the openglwindow example
class Window : public OpenGLWindow
{
Q_OBJECT
public:
using OpenGLWindow::OpenGLWindow;
void render(QPainter *p) override
{
QLinearGradient g(0, 0, 0, height());
g.setColorAt(0, QColor("lightsteelblue"));
g.setColorAt(1, Qt::black);
p->fillRect(0, 0, width(), height(), g);
p->setPen(Qt::white);
p->drawText(20, 30, QLatin1String("This is an OpenGL based QWindow"));
if (m_key.trimmed().length() > 0) {
QRect bounds = p->boundingRect(QRect(0, 0, width(), height()), Qt::AlignTop | Qt::AlignLeft, m_key);
p->save();
p->translate(width() / 2.0, height() / 2.0);
p->scale(10, 10);
p->translate(-bounds.width() / 2.0, -bounds.height() / 2.0);
p->drawText(bounds, Qt::AlignCenter, m_key);
p->restore();
}
if (m_focus)
p->drawText(20, height() - 20, QLatin1String("Window has focus!"));
p->setRenderHint(QPainter::Antialiasing);
p->drawPolyline(m_polygon);
}
void mousePressEvent(QMouseEvent *e) override
{
if (!m_mouseDown) {
m_mouseDown = true;
m_polygon.clear();
m_polygon.append(e->position().toPoint());
renderLater();
}
}
void mouseMoveEvent(QMouseEvent *e) override
{
if (m_mouseDown) {
m_polygon.append(e->position().toPoint());
renderLater();
}
}
void mouseReleaseEvent(QMouseEvent *e) override
{
if (m_mouseDown) {
m_mouseDown = false;
m_polygon.append(e->position().toPoint());
renderLater();
}
}
void focusInEvent(QFocusEvent *) override
{
m_focus = true;
renderLater();
}
void focusOutEvent(QFocusEvent *) override
{
m_focus = false;
m_polygon.clear();
renderLater();
}
void keyPressEvent(QKeyEvent *e) override
{
m_key = e->text();
renderLater();
}
void keyReleaseEvent(QKeyEvent *) override
{
m_key = QString();
renderLater();
}
private:
QPolygon m_polygon;
QString m_key;
bool m_mouseDown = false;
bool m_focus = false;
};
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QWidget *widget = new QWidget;
QHBoxLayout *layout = new QHBoxLayout(widget);
Window *window = new Window;
QWidget *container = QWidget::createWindowContainer(window);
container->setMinimumSize(300, 300);
container->setMaximumSize(600, 600);
container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
container->setFocusPolicy(Qt::StrongFocus);
window->setGeometry(100, 100, 300, 200);
layout->addWidget(new QLineEdit(QLatin1String("A QLineEdit")));
layout->addWidget(container);
layout->addWidget(new QLineEdit(QLatin1String("A QLabel")));
widget->show();
return app.exec();
}
#include "windowcontainer.moc"
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