I'm assuing you are using Linux/X. Each widget that you can "draw" to has an associated window (an X Window in this case). In GTK it is refered to as a GdkWindow (built around an X Window). When you "draw" to a window, you almost always draw the window's "background" (usually a solid color or a tiled pixmap) in order to "clear" it in a way and then you draw other details such as text and lines in it. When you do this, it flickers because first you see the entire window being redrawn a solid color first before the details such as text and lines being redraw. The way around this is to use "back buffers" and that's X Pixmaps, in GTK it is refered to as a GdkPixmap. What you do is draw to the GdkPixmap first (same thing, draw a solid background, then details). Then you "put" the GdkPixmap to the GdkWindow all in one pass so there is no "flickering". --Tara On 2004.01.08 01:09 Mama Mari wrote: > Dear All, > I am a beginner in using the GUI Toolkits. I have started with FLTK. > Later on I discovered that FLTK has a drawing problem. It is flashing > when > you resize the window or some objects (like scrollbar) blinks. > I used some demo programs which written by Microwindows. They have the > same > problem. When I asked them why?, they said it is because of the way of > FLTK > draw/redraw. > Later on I have started to use GTK+. BUT?. It has the same problem. > I have a Celeron(R) CPU 2.GHZ, 256 RAM computer. > It is very strange ? how it blinks with such a computer???? What speed > should the computer have for stopping blinking? > > What is wrong? . > I have Dev-cpp with g++ compiler. > I highly appreciate any one could answer me.. > > _________________________________________________________________ > Protect your PC - get McAfee.com VirusScan Online > http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963 > > _______________________________________________ > > gtk-list@xxxxxxxxx > http://mail.gnome.org/mailman/listinfo/gtk-list > _______________________________________________ gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
