[GRASS-dev] Re: wxGUI: MapDisplay mouse events

[Margherita Di Leo]

Hi Vasek,

I just tried your API in my rstream GUI and it works very well, thanks a lot
for your work! To devs who have SVN writing permission, may I ask if is it
possible to commit this patch into the core code please?

Thanks,

madi




>
> ---------- Forwarded message ----------
> From: Wenzeslaus <wenzeslaus at gmail.com>
> To: grass-dev at lists.osgeo.org
> Date: Tue, 16 Aug 2011 19:44:11 +0200
> Subject: [GRASS-dev] Re: wxGUI: MapDisplay mouse events
> Hi list,
>
> I have suggestion about processing mouse events from MapDisplay
> (BufferedWindow, GLWindow). In mapdisplay_mouse_events.diff is
> implementation of API which should be enough generic to be used by
> more than one module.
>
> You can bind your own handler to MapDisplay (MapWindow to be precise)
> MouseEvents by public API. It is no longer necessary to edit code in
> *mapdisp*.py files. (It is the main advantage.)
>
> I have attached test code (mapdisplay_mouse_events_example.diff). It
> gets coordinates from MapDisplay. I think it is
> something like Margarita needs in her rstream module. Example is also
> included in doc string.
>
> Suggested code works with both 2D (BufferedWindow) and 3D (GLWindow)
> and with multiple MapDisplays.  It is also possible to override
> current cursor.
>
> It doesn't work with Digitizer (VDigitWindow) (no errors but functions
> report unsuccessful binds).
>
> The handler can be also unbound with this API. However all other
> handlers will be unbounded (and only MapWindow handlers will be
> bounded again). Unbind only one handler is not possible in wxPython.
>
> I'm not sure how to handle standard behaviour of mouse events in
> MapWindow and its subclasses. Now, functions connected with
> mouse['use'] are disabled by setting mouse['use'] to other value. But
> there are also other aproaches. Functions can be disabled in wxPython
> way by Unbind() or we can let functions to do what they do usualy, but
> it will be very confusing, I think.
>
> Vasek
>
>
>
-- 
Eng. Margherita Di Leo
Ph.D. Candidate
Methods and Technologies for Environmental Monitoring
Department of Environmental Engineering and Physics (DIFA)

University of Basilicata
Campus Macchia Romana
85100 - Potenza
Italy

Office: +39-0971205360
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