Re: Gtk::DrawingArea

[Antonio Coralles <noche suapie reflex at>]

Ian Strascina wrote:

> Hi, I'm trying to capture a click inside a Gtk::DrawingArea to create a
> simple "painting" app (by drawing a pixel and the clicked location)...
> Since they DrawingArea itself does not have any specific signals, I
> attempted to use both the 'signal_event()' and
> 'signal_button_press_event()' signals (w/in Gtk::Widget) without
> success...  I've been looking at the documentation for the last hour
> and can't find any other possibilities...  Does anyone know how to do
> this...???  Am I missing something really simple...???
>
>
>         - Ian
>
>
> -------------------------------------------------------------------------------
> "Should array indices start at 0 or 1???  My compromise of 0.5 was
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>         -- Stan Kelly-Bootle
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i would suggest you to inherit your class from a Gtk::DrawingArea and 
then override
on_button_press_event(GdkEventButton*); this function is inherited from 
Gtk::Widget, so you don't see it in the Gtk::DrawingArea ducumentation 
unless you select "view all members". maybe you'll also find
on_key_press_event(GdkEventKey*) usefull. besides, and that's the most 
important part of my answer, you should look at 
http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/ch14.html, where 
you get some more general info about drawing areas and so on. If you 
don't know how to use the various GdkEvent... structs, just take a look 
at http://developer.gnome.org/doc/API/2.0/gdk/gdk-Event-Structures.html 
where you can find detailed information about them. at last, you should 
also that a look at Gtk::Layout which is somekind of DrawingArea with 
scrolling support.

hope that helps,
                              antonio