Getting screen coordinate of a window

[Norman Feske]

Hi Michael,

> Can I get screen coordinates of a window? I would like to be able to
> caputure absolute mouse events and convert them to the window coordinate
> system. I don't want to have relative mouse movement like I see in many
> examples. In my context it doesn't work very well.
> 
> BTW the handle_relative_motion never seems to return anything. Is there a
> configuration that I need? Would be terific if I could by some function
> get window internal coordinates, but handle_relative_motion might not be
> something for that?

both the nitpicker GUI server as well as the wm deliver only absolute 
motion events. Events delivered by nitpicker refer to the upper-left 
corner of the screen. Events delivered by the wm "virtualize" this 
upper-left corner so that the real window position is not exposed to the 
application. When creating a view at position (0,0), the received motion 
events refer to the position within the window.

BTW, the easiest way to see what input events you receive is to print 
each event. You can pass an Input::Event directly to the 'log' function.

The wm (specifically the layouter) reports the window layout (including 
pixel positions for each window) as "window_layout" report. This report 
is normally consumed only by the decorator. By reflecting this report as 
a ROM (using report_rom) to your application, you can make the 
application aware of the complete layout if you want so. You may have a 
look at [1] to see the interplay of the window-management components 
(wm, layouter, decorator).

[1] 
https://github.com/genodelabs/genode/blob/master/repos/gems/recipes/raw/motif_wm/wm.config

Cheers
Norman

-- 
Dr.-Ing. Norman Feske
Genode Labs

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