Input Event Handling

Thu Apr 5 05:34:51 PDT 2007

Thorsten Wilms wrote:
> > Input focus is to a particular window, so you get device -> kernel -> X
> > server -> app.
>> There are cases like sliders in a windows with scrollbars. With 
> gtk+ at least, if the pointer is on the slider, mouse-wheel will 
> move the slider. But with the pointer anywhere else, the wheel 
> scrolls.
> Does this mean that input focus has to be redone on the window/ 
> application level for things like this to work?

The mouse wheel generates button events, not key events; there are
some differences in the way that the two are handled. In particular,
unless there is a grab active, button events are always reported to
the window under the pointer; there is no persistent "mouse focus" in
the same sense that there is a keyboard focus.
-- 
Glynn Clements <glynn at gclements.plus.com>