Need Qt QPA and X11 clarification

Question

I tried to understand Qts platform handling for hours now, but I dont get it. For my hotkey handling I currently use a mixture of X11extras for getting display, xlib for key conversions and xcb for the Qt native event handling. Three libs to link. And where does the undocumented QPA play a role here? Now I wonder if this is necessary. I need some clarification here. I am using qt 5.4. What is the way to go for the future?

Answer 1

For Qt, you shouldn't need to do any native platform coding for key events unless you're using native windows. Read about QEvent and the event functions in QWidget .

Use QWidget::nativeEvent() or QCoreApplication::installNativeEventFilter() if you need direct access to raw X11 events. Native event filters at the application level are processed for every event and have more of a performance impact than subclassing QWidget and reimplementing nativeEvent() .

Read about QWindow::fromWinId() and QWidget::createWindowContainer() if you need to embed a native window as a child widget.