Re: scribble-simple in C++, need help

[Owen Taylor <owt1 cornell edu>]

Alois Camenzind <camenzind@cyberlink.ch> writes:

> Hi,
> 
> I'm trying to rewrite the scribble-simple example from the gtk tutorial
> (http://www.levien.com/~slow/gtk/tutorial/gtk_tut-20.html ) in C++
> using gtk--. But I'm having problems with calls to gdk_xxxx.
> I thought that after the call to gdk_draw_rectangle() I should see
> the white drawing area, but nothing happens and the drawing area
> stays grey. The Window itself and the quit button are shown.
> What's wrong with my code or is it something missing?

Yep. You're missing the expose event handler. If you haven't
taken a look at the complete C source

 (at http://www.msc.cornell.edu/~otaylor/gtk-gimp/tutorial/)

Then you probably should.


>     // don't know if this is neccessary
>     drawing_area->set_events(GDK_EXPOSURE_MASK
>             | GDK_LEAVE_NOTIFY_MASK
>             | GDK_BUTTON_PRESS_MASK
>             | GDK_POINTER_MOTION_MASK
>             | GDK_POINTER_MOTION_HINT_MASK);


Yep, it is.

Regards,
                                        Owen