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Diffstat (limited to 'tests/manual/wasm/eventloop/main_exec/main.cpp')
-rw-r--r-- | tests/manual/wasm/eventloop/main_exec/main.cpp | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/tests/manual/wasm/eventloop/main_exec/main.cpp b/tests/manual/wasm/eventloop/main_exec/main.cpp new file mode 100644 index 0000000000..d1eeaeaae3 --- /dev/null +++ b/tests/manual/wasm/eventloop/main_exec/main.cpp @@ -0,0 +1,114 @@ +/**************************************************************************** +** +** Copyright (C) 2021 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** BSD License Usage +** Alternatively, you may use this file under the terms of the BSD license +** as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of The Qt Company Ltd nor the names of its +** contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ +#include <QtGui> + +// This example demonstrates how the standard Qt main() +// pattern works on Emscripten/WebAssambly, where exec() +// does not return. + +class ClickWindow: public QRasterWindow +{ +public: + ClickWindow() { + qDebug() << "ClickWindow constructor"; + } + ~ClickWindow() { + qDebug() << "ClickWindow destructor"; + } + + void paintEvent(QPaintEvent *ev) override { + QPainter p(this); + p.fillRect(ev->rect(), QColorConstants::Svg::deepskyblue); + p.drawText(50, 100, "Application has started. See the developer tools console for debug output"); + } + + void mousePressEvent(QMouseEvent *) override { + qDebug() << "mousePressEvent(): calling QGuiApplication::quit()"; + QGuiApplication::quit(); + } +}; + +int main(int argc, char **argv) +{ + qDebug() << "main(): Creating QGuiApplication object"; + QGuiApplication app(argc, argv); + + QObject::connect(&app, &QCoreApplication::aboutToQuit, [](){ + qDebug() << "QCoreApplication::aboutToQuit"; + }); + + ClickWindow window; + window.show(); + + qDebug() << "main(): calling exec()"; + app.exec(); + + // The exec() call above never returns; instead, a JavaScript exception + // is thrown such that control returns to the browser while preserving + // the C++ stack. + + // This means that the window object above is not destroyed, and that + // shutdown code after exec() does not run. + + qDebug() << "main(): after exit"; // <- will not be printed +} + +// Global variables are created before main() as usual, but not destroyed +class Global +{ +public: + Global() { + qDebug() << "Global constructor"; + } + ~Global() { + qDebug() << "Global destructor"; // <- will not be printed + } +}; +Global global; |