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.
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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
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