05fc3aef53
Replace the current license disclaimer in files by a SPDX-License-Identifier. Files that have to be modified by hand are modified. License files are organized under LICENSES directory. Task-number: QTBUG-67283 Change-Id: Id880c92784c40f3bbde861c0d93f58151c18b9f1 Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: Lars Knoll <lars.knoll@qt.io> Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io>
67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
// Copyright (C) 2021 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include <QtGui>
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// This example demonstrates how to create QGuiApplication
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// without calling exec(), and then exiting main() without
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// shutting down the Qt event loop.
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class ClickWindow: public QRasterWindow
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{
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public:
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ClickWindow() {
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qDebug() << "ClickWindow constructor";
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}
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~ClickWindow() {
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qDebug() << "ClickWindow destructor";
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}
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void paintEvent(QPaintEvent *ev) override {
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QPainter p(this);
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p.fillRect(ev->rect(), QColorConstants::Svg::deepskyblue);
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p.drawText(50, 100, "Application has started. See the developer tools console for debug output");
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}
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void mousePressEvent(QMouseEvent *) override {
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qDebug() << "mousePressEvent(): calling QGuiApplication::quit()";
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QGuiApplication::quit();
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}
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};
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int main(int argc, char **argv)
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{
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qDebug() << "main(): Creating QGuiApplication object";
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QGuiApplication *app = new QGuiApplication(argc, argv);
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QObject::connect(app, &QCoreApplication::aboutToQuit, [](){
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qDebug() << "QCoreApplication::aboutToQuit";
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});
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qDebug() << "main(): Creating ClickWindow object";
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ClickWindow *window = new ClickWindow();
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window->show();
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// We can exit main; the Qt event loop and the emscripten runtime
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// will keep running, as long as Emscriptens EXIT_RUNTIME option
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// has not been enabled.
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qDebug() << "main(): exit";
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}
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// Global variables are created before main() as usual, but not destroyed
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class Global
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{
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public:
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Global() {
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qDebug() << "Global constructor";
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}
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~Global() {
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qDebug() << "Global destructor"; // <- will not be printed
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}
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};
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Global global;
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