How to send artificial QKeyEvent to QWebEngineView?

Question

Context: I am creating a small web browser with a custom on-screen keyboard.

It worked almost perfectly with Qt WebKit ( QWeb* classes), but there were crashes due to errors in WebKit ... which will not be fixed after Qt 5.4.0, since they are switching to Qt WebEngine.

So, I decided to move the material to Qt WebEngine ( QWebEngine* classes), following the short guide on navigating webkit-> webengine. Following the QWebElement clause QWebElement , I worked out a way to show / hide the on-screen keyboard (which now requires the launch of async. JS code). But I scratch my head how to send fake key events to a web page.

I tried some things:

• QCoreApplication::postEvent(m_webview, event) does nothing when it works with old QWeb things;
• You can send keys by running JavaScript, but I find this too messy

Thanks,

Answer 1

I guess the only way to achieve this right now would be to use QAction to send the event to the WebView, using for example something like this:

 connect( this , SIGNAL( keyPressed( int ) ) , &m_webview , SLOT( handleKey( int ) ) ); 

---

I believe that functionality will be added in Qt 5.5.1, as you can see below:

https://codereview.qt-project.org/#/c/104901/

Answer 2

Despite the fact that the initial question is one year old, it is still relevant for those who, like me, decided to move (finally!) From QWebKit to QWebEngine (Qt 5.5 - 5.6b). Here is a dirty solution that requires an existing webenginepage-> view (). This is for mouse events, and it would not be a big surprise if it were not located for keyboard events:

 void Whatever::sendMouseEvent( QObject* targetObj, QMouseEvent::Type type, const QPoint& pnt ) const { QMouseEvent event( type, pnt, Qt::LeftButton, Qt::LeftButton, Qt::NoModifier ); QApplication::sendEvent( targetObj, &event ); } void Whatever::sendMouseClick( QObject* targetObj, const QPoint& pnt ) const { sendMouseEvent( targetObj, QMouseEvent::MouseMove, pnt ); sendMouseEvent( targetObj, QMouseEvent::MouseButtonPress, pnt ); sendMouseEvent( targetObj, QMouseEvent::MouseButtonRelease, pnt ); } void Whatever::emulateMouseClick( const QPoint& pnt ) const { //-- right now (Qt 5.5 & 5.6) there is only one child - //-- QtWebEngineCore::RenderWidgetHostViewQtDelegateWidget //-- but it could change in future Q_FOREACH( QObject* obj, mWebEnPage->view()->children() ) //-- ACHTUNG! Check mWebEnPage->view() in real code! if( qobject_cast<QWidget*>( obj ) ) sendMouseClick( obj, pnt ); } 

Inspired by Using QWebEngine to Render an Image as well as How Can I Draw Events Using QtWebEngine? and googling.

Answer 3

This code is working fine

  for(auto* child : ui->webEngineView->children() ) { int key = Qt::Key_V; //or some other QKeyEvent pressEvent = QKeyEvent(QEvent::KeyPress, key, Qt::NoModifier, QKeySequence(key).toString()); QKeyEvent releaseEvent = QKeyEvent(QEvent::KeyRelease, key, Qt::NoModifier); qApp->sendEvent(child, &pressEvent); qApp->sendEvent(child, &releaseEvent); }