signal callback delegate or function to connect
void callback(string id, string key, gstgl.glwindow.GLWindow gLWindow)
id the name of the event (optional)
key the id of the key pressed (optional)
gLWindow the instance the signal is connected to (optional)
Yes.After to execute callback after default handler, No.After to execute before (default)
Signal ID
Connect to KeyEvent signal.
Will be emitted when a key event is received by the GstGLwindow.