Event propagation in with event controllers

[Eric Williams <ericwill redhat com>]

Hello,

I am in the process of porting our application to make use of the 
GtkEventController API provided in GTK3.24.

I am having some trouble understanding how the event propagation works. 
Consider a simple application with this structure:

GtkWindow
  GtkBox
    GtkScrolledWindow
      Custom container

I have created a GtkEventControllerMotion for both the toplevel 
GtkWindow and the custom container, with all 3 motion events connected. 
The propagation phase for each is GTK_PHASE_CAPTURE.

However I only ever receive events destined for the GtkWindow, 
motion/enter/leave events for the custom container are never received. 
Now, if I create the GtkEventControllerMotion for the GtkScrolledWindow, 
the custom container receives the proper motion events along with the 
GtkWindow.

Why is this? Is there something I need to correct in my custom container 
implementation? Using the "old" way of doing things (connecting 
motion/enter/leave-notify to the widget itself) works fine.


Thanks,

--
Eric Williams
Software Engineer - Eclipse/SWT Team
Red Hat