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| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the examples of the Qt Toolkit. |
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| ****************************************************************************/ |
| |
| #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 opengl example in gui. |
| 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->pos()); |
| renderLater(); |
| } |
| } |
| |
| void mouseMoveEvent(QMouseEvent *e) override |
| { |
| if (m_mouseDown) { |
| m_polygon.append(e->pos()); |
| renderLater(); |
| } |
| } |
| |
| void mouseReleaseEvent(QMouseEvent *e) override |
| { |
| if (m_mouseDown) { |
| m_mouseDown = false; |
| m_polygon.append(e->pos()); |
| 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" |