Qt, How to catch mouse release events from widgets

Question

I've overrode the eventFilter method of the MainWindow of the application

  bool MainWindow::eventFilter(QObject *obj, QEvent *event){

   if(event->type()== QEvent::MouseButtonRelease){
      cout<<"CATCH"<<endl;
   }
   return QObject::eventFilter(obj,event);
  }

I can get all events thrown by QWidgets except events arose by QPushButton and Widgets that implement the click event,I mean if I click on the background I can get the release event,if i click on a QLabel or a QWidget Container i still get the event, but I can't get mouse events from QPushButton, QCalendar, GroupBox etc...

I've tried to promote (I'm using QtCreator) the QPushButton overriding both the methods

 void mousePressEvent(QMouseEvent* event) override;
 void mouseReleaseEvent(QMouseEvent* event) override;

But even this does not work because these methods are not called when clicking on the QPushButton. So I've overrode the filter method of the button and I can catch only graphic events like PaletteChangeEvent or RepaintingEvent.

What am I doing wrong?

It might be that QPushButton has reimplemented eventFilter() for its own internal purposes and handles those events. Therefore they don't reach your event filter. — vahancho

Marcelino Marcelino · Accepted Answer · 2020-12-16T21:26:19

You have to install an EventFilter in your buttons and QWidgets to receive the events that are sent to those objects before them.

By doing that you can define a method that receive all the events that are sent to those objects and you can catch the ones you want.

Read this to see an example: Event Filters

Qt, How to catch mouse release events from widgets

1 Answers