main.cpp

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// Copyright (C) 2023 Samuel Gaist <samuel.gaist@edeltech.ch>
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
//! [QApplication subclass]
#include <QApplication>
#include <QDebug>
#include <QFile>
#include <QFileOpenEvent>
#include <QPushButton>
 
class MyApplication : public QApplication
{
public:
    MyApplication(int &argc, char **argv)
        : QApplication(argc, argv)
    {
    }
 
    bool event(QEvent *event) override
    {
        if (event->type() == QEvent::FileOpen) {
            QFileOpenEvent *openEvent = static_cast<QFileOpenEvent *>(event);
            const QUrl url = openEvent->url();
            if (url.isLocalFile()) {
                QFile localFile(url.toLocalFile());
                // read from local file
            } else if (url.isValid()) {
                // process according to the URL's schema
            } else {
                // parse openEvent->file()
            }
        }
 
        return QApplication::event(event);
    }
};
//! [QApplication subclass]
 
int main(int argc, char *argv[])
{
    MyApplication app(argc, argv);
    QPushButton closeButton("Quit");
    QObject::connect(&closeButton, &QPushButton::clicked, &app, &QApplication::quit);
    closeButton.show();
    return app.exec();
}