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wasm: add manual tests for main() and exec()

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Add minimal examples which demonstrates how exec() works
on Qt for WebAssembly and how to implement main() without
calling QApplication::exec().

Change-Id: I44f1d16af19c538380cc56faf3f0f4cc9d66cf11
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
This commit is contained in:
Morten Johan Sørvig 2021-08-12 18:40:08 +02:00
parent c6362cd55c
commit 82f14a95b5
10 changed files with 367 additions and 0 deletions
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1
tests/manual/wasm/CMakeLists.txt
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@ -1,3 +1,4 @@
add_subdirectory(eventloop)
if(QT_FEATURE_widgets)
add_subdirectory(cursors)
add_subdirectory(localfiles)

1
tests/manual/wasm/README.md
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@ -9,4 +9,5 @@ Content
-------
cursors Cursor handling
eventloop Event loops, application startup, dialog exec()
localfiles Local file download and upload

5
tests/manual/wasm/eventloop/CMakeLists.txt Normal file
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@ -0,0 +1,5 @@
add_subdirectory(main_exec)
add_subdirectory(main_noexec)
if(QT_FEATURE_widgets)
add_subdirectory(dialog_exec)
endif()

13
tests/manual/wasm/eventloop/README.md Normal file
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@ -0,0 +1,13 @@
Event loop exec() and main() on Qt for WebAssembly
==================================================
These examples demonstrate how QEventLoop::exec() works on
Qt for WebAssembly, and also shows how to implement main()
without calling QApplication::exec().
Contents
========
main_exec Standard Qt main(), where QApplication::exec() does not return
main_noexec Qt main() without QApplication::exec()
dialog_exec Shows how QDialog::exec() also does not return

9
tests/manual/wasm/eventloop/dialog_exec/CMakeLists.txt Normal file
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@ -0,0 +1,9 @@
qt_internal_add_manual_test(dialog_exec
GUI
SOURCES
main.cpp
PUBLIC_LIBRARIES
Qt::Core
Qt::Gui
Qt::Widgets
)

95
tests/manual/wasm/eventloop/dialog_exec/main.cpp Normal file
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@ -0,0 +1,95 @@
/****************************************************************************
**
** 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>
#include <QtWidgets>
// This example show how calling QDialog::exec() shows the dialog,
// but 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 QMessageBox::exec()";
QMessageBox messageBox;
messageBox.setText("Hello! This is a message box.");
connect(&messageBox, &QMessageBox::buttonClicked, [](QAbstractButton *button) {
qDebug() << "Button Clicked" << button;
});
messageBox.exec(); // <-- does not return
qDebug() << "mousePressEvent(): done"; // <--- will not be printed
}
};
int main(int argc, char **argv)
{
QApplication app(argc, argv);
ClickWindow window;
window.show();
return app.exec();
}

8
tests/manual/wasm/eventloop/main_exec/CMakeLists.txt Normal file
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@ -0,0 +1,8 @@
qt_internal_add_manual_test(main_exec
GUI
SOURCES
main.cpp
PUBLIC_LIBRARIES
Qt::Core
Qt::Gui
)

114
tests/manual/wasm/eventloop/main_exec/main.cpp Normal file
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@ -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;

8
tests/manual/wasm/eventloop/main_noexec/CMakeLists.txt Normal file
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@ -0,0 +1,8 @@
qt_internal_add_manual_test(main_noexec
GUI
SOURCES
main.cpp
PUBLIC_LIBRARIES
Qt::Core
Qt::Gui
)

113
tests/manual/wasm/eventloop/main_noexec/main.cpp Normal file
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@ -0,0 +1,113 @@
/****************************************************************************
**
** 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 to create QGuiApplication
// without calling exec(), and then exiting main() without
// shutting down the Qt event loop.
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 = new QGuiApplication(argc, argv);
QObject::connect(app, &QCoreApplication::aboutToQuit, [](){
qDebug() << "QCoreApplication::aboutToQuit";
});
qDebug() << "main(): Creating ClickWindow object";
ClickWindow *window = new ClickWindow();
window->show();
// We can exit main; the Qt event loop and the emscripten runtime
// will keep running, as long as Emscriptens EXIT_RUNTIME option
// has not been enabled.
qDebug() << "main(): exit";
}
// 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;