GTK+ Forums Discussion forum for GTK+ and Programming. Ask questions, troubleshoot problems, view and post example code, or express your opinions.    FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  drawable and expose_event          GTK+ Forums Forum Index -> GTK+ Programming Author Message bil Familiar Face Joined: 27 Mar 2007 Posts: 26 Posted: Fri May 11, 2007 5:02 am    Post subject: drawable and expose_event I want to display random pictures each time expose_event is called. There are 2 related problems, 1) how to clear all content of the drawable? 2) when the previous picture is partially covered and then if I use gdk_draw_pixbuf to draw a new picture, some portion of the old picture is still leaved untouched, Is there any means to invalidate the whole drawable inside the expose_event? Thankx Back to top openldev Never Seen the Sunlight Joined: 21 Sep 2005 Posts: 376 Location: State College, Pennsylvania Posted: Fri May 11, 2007 1:16 pm    Post subject: You can use gdk_window_clear() to erase the contents of a GdkWindow. As for your second problem, could we see a bit of code? Back to top bil Familiar Face Joined: 27 Mar 2007 Posts: 26 Posted: Fri May 11, 2007 1:39 pm    Post subject: openldev wrote: You can use gdk_window_clear() to erase the contents of a GdkWindow. As for your second problem, could we see a bit of code? Hi, thank you for suggestion. I tried that but it didn't work. But I finally found the reason. It is because inside the expose_event, gtk+ already call gdk_begin_paint_region so that only those hidden portion will be updated after gdk_end_paint. I turn off double buffering and it works. thanks again. Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         GTK+ Forums Forum Index -> GTK+ Programming All times are GMT Page 1 of 1 Powered by phpBB © 2001, 2005 phpBB Group CodeBB 1.0 Beta 2 Protected by Anti-Spam ACP