Re: How to udate an image using on_expose_event()?

[Bob Caryl <bob fis-cal com>]

MERT TUGCU wrote:

> Hi,
>
> I am a little bit new to gtkmm. In my application I need to display an 
> image which is stored in a memory buffer. I checked the drawing area 
> example in the tutorial but it didn't help.  I have three drawing 
> areas in my application to display three different images. My question 
> is how can I redraw an image that is stored in memory when something 
> gets on top of it or the UI is minimized etc.  The prototype for the 
> function is:
> virtual bool on_expose_event(GdkEventExpose* e); and I couldn't figure 
> out how to pass a pointer, that points to an image, to this function.
>
>
> _______________________________________________
> gtkmm-list mailing list
> gtkmm-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtkmm-list
Hey MERT,

There are two ways to do this.

1.  Connect to your drawing area's on_expose_event signal specifying a 
callback that will update your drawing area.  See 
http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/apb.html#id2510543 
for information on how to connect a callback slot to a particular signal.

2.  Derive your own class for your drawing area and then override the 
function to which your referred in your message (on_expose_event).

Bob Caryl