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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include <QtCore/QEvent>
#include <QtCore/qobject.h>
#include <QtCore/qregularexpression.h>
#include <QtGui/qscreen.h>
#include <QtGui/qwindow.h>
#include <QtGui/qguiapplication.h>
#include <emscripten.h>
#include <emscripten/bind.h>
#include <emscripten/val.h>
#include <memory>
#include <sstream>
#include <vector>
class DeleteOnCloseWindow : public QWindow
{
Q_OBJECT
private:
void closeEvent(QCloseEvent *ev) override
{
Q_UNUSED(ev);
delete this;
}
};
using namespace emscripten;
std::string toJSArray(const std::vector<std::string> &elements)
{
std::ostringstream out;
out << "[";
bool comma = false;
for (const auto &element : elements) {
out << (comma ? "," : "");
out << element;
comma = true;
}
out << "]";
return out.str();
}
std::string toJSString(const QString &qstring)
{
Q_ASSERT_X(([qstring]() {
static QRegularExpression unescapedQuoteRegex(R"re((?:^|[^\\])')re");
return qstring.indexOf(unescapedQuoteRegex) == -1;
})(),
Q_FUNC_INFO, "Unescaped single quotes found");
return "'" + qstring.toStdString() + "'";
}
std::string rectToJSObject(const QRect &rect)
{
std::ostringstream out;
out << "{"
<< " x: " << std::to_string(rect.x()) << ","
<< " y: " << std::to_string(rect.y()) << ","
<< " width: " << std::to_string(rect.width()) << ","
<< " height: " << std::to_string(rect.height()) << "}";
return out.str();
}
std::string screenToJSObject(const QScreen &screen)
{
std::ostringstream out;
out << "{"
<< " name: " << toJSString(screen.name()) << ","
<< " geometry: " << rectToJSObject(screen.geometry()) << "}";
return out.str();
}
std::string windowToJSObject(const QWindow &window)
{
std::ostringstream out;
out << "{"
<< " id: " << std::to_string(window.winId()) << ","
<< " geometry: " << rectToJSObject(window.geometry()) << ","
<< " frameGeometry: " << rectToJSObject(window.frameGeometry()) << ","
<< " title: '" << window.title().toStdString() << "' }";
return out.str();
}
void windowInformation()
{
auto windows = qGuiApp->allWindows();
std::vector<std::string> windowsAsJsObjects;
windowsAsJsObjects.reserve(windows.size());
std::transform(windows.begin(), windows.end(), std::back_inserter(windowsAsJsObjects),
[](const QWindow *window) { return windowToJSObject(*window); });
emscripten::val::global("window").call<void>("windowInformationCallback",
emscripten::val(toJSArray(windowsAsJsObjects)));
}
void screenInformation()
{
auto screens = qGuiApp->screens();
std::vector<std::string> screensAsJsObjects;
screensAsJsObjects.reserve(screens.size());
std::transform(screens.begin(), screens.end(), std::back_inserter(screensAsJsObjects),
[](const QScreen *screen) { return screenToJSObject(*screen); });
emscripten::val::global("window").call<void>("screenInformationCallback",
emscripten::val(toJSArray(screensAsJsObjects)));
}
void createWindow(int x, int y, int w, int h, std::string screenId, std::string title)
{
auto screens = qGuiApp->screens();
auto screen_it = std::find_if(screens.begin(), screens.end(), [&screenId](QScreen *screen) {
return screen->name() == QString::fromLatin1(screenId);
});
if (screen_it == screens.end()) {
qWarning() << "No such screen: " << screenId;
return;
}
auto *window = new DeleteOnCloseWindow;
window->setFlag(Qt::WindowTitleHint);
window->setFlag(Qt::WindowMaximizeButtonHint);
window->setTitle(QString::fromLatin1(title));
window->setGeometry(x, y, w, h);
window->setScreen(*screen_it);
window->showNormal();
}
EMSCRIPTEN_BINDINGS(qwasmwindow)
{
emscripten::function("screenInformation", &screenInformation);
emscripten::function("windowInformation", &windowInformation);
emscripten::function("createWindow", &createWindow);
}
int main(int argc, char **argv)
{
QGuiApplication app(argc, argv);
app.exec();
return 0;
}
#include "qwasmwindow_harness.moc"
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