I gather from recent discussion on the gtk-devel list that a good deal of the old GDK drawing API may be removed for GTK 3 in favor of use of cairo: in particular GdkGC seems likely to disappear. There appear to be good arguments for this, but it means some extra work for people trying to get their apps GTK3-ready.
Benjamin Otte has some notes on porting at http://blogs.gnome.org/otte/2010/07/27/rendering-cleanup/ but there's one piece of GDK code I've been using for which I can't figure out the cairo equivalent and I wonder if anyone can help. The context is zooming to a selected portion of a graphic displayed in a GTK window. If the user selects a Zoom menu item she can then drag out a rectangular outline on the current image, and when the mouse button is released the view snaps to the chosen rectangle. The tricky part is avoiding a horrible mess as the user drags the rectangle. This is achieved via a cycle of draw-display-erase as the mouse pointer moves. In GDK, the "erase" part is done by redrawing the last-shown rectangle using an inverted GdkGC: gdk_gc_set_function(gc, GDK_INVERT); How would you do this in cairo? Thanks. -- Allin Cottrell Department of Economics Wake Forest University _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list