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POAsk confirmation before closing a QQuickView or QApplication
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  1. POAsk confirmation before closing a QQuickView or QApplication
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    copied!<p>I am trying to catch a close event either in my <code>MyApplication</code> instance inheriting from <code>QApplication</code> or in my <code>WindowQML</code> instance inheriting from <code>QQuickView</code>. The goal is to ask confirmation to quit before really closing the application.</p> <p>Before my application was relying on <code>QMainWindow</code> where I implemented the <code>closeEvent()</code> method like this:</p> <pre><code>// MainWindow inherits from QMainWindow void MainWindow::closeEvent(QCloseEvent *event) { event-&gt;ignore(); confirmQuit(); // ask for confirmation first } </code></pre> <p>The problem is that my class <code>WindowQML</code> which inherits from <code>QQuickView</code> never pass inside the <code>closeEvent()</code> method. I then tried to overload the <code>event()</code> method like this:</p> <pre><code>// WindowQML inherits from QQuickView bool WindowQML::event(QEvent *event) { if(event-&gt;type() == QEvent::Close) { qDebug() &lt;&lt; "CLOSE EVENT IN QML WINDOW"; } } </code></pre> <p>but this event never happened either.</p> <p>The next road I tried to take was to catch the close event in <code>MyApplication</code> like this:</p> <pre><code>// We need to check for the quit event to ask confirmation in the QML view bool MyApplication::event(QEvent *event) { bool handled = false; switch (event-&gt;type()) { case QEvent::Close: qDebug() &lt;&lt; "Close event received"; event-&gt;ignore(); // mandatory? handled = true; Q_EMIT quitSignalReceived(); break; default: qDebug() &lt;&lt; "Default event received"; handled = QApplication::event(event); break; } qDebug() &lt;&lt; "Event handled set to : " &lt;&lt; handled; return handled; } </code></pre> <p>The signal <code>quitSignalReceived()</code> is emitted properly but the event is not "blocked" properly and my application still closes.</p> <p>So I have two questions:</p> <ol> <li>Is there a way to detect the closing event of a <code>QQuickView</code> instance?</li> <li>If it is not possible, is the <code>MyApplication::event()</code> way the best course of action? Why do I need to call <code>event-&gt;ignore()</code> here? I would have thought that returning <code>true</code> would be enough.</li> </ol>
 

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