>gint exposeEventHandler(GtkWidget* widget, GdkEventExpose* event) { > gdk_draw_pixmap(widget->window, widget->style->fg_gc[GTK_WIDGET_STATE(widge >t)], > Pixmaps::myPicture, event->area.x, event->area.y, > event->area.x, event->area.y, event->area.width, event->area.height); > > return FALSE; >}; > > >Pixmaps make expose event handlers easy I think because you can just >redraw uncovered portion with a single function call as in function above. > >WHY CAN'T WE REDRAW A PORTION OF THE DRAWING AREA THE SAME >WAY AND AVOID NEED FOR PIXMAP?
because we're shouting? its because a Pixmap is a different kind of resource than a Window. They are both considered to "drawables" - you can draw things on them by calling the gdk_draw_*() functions. However, a pixmap is an "offscreen" drawable that is never mapped to the display. A window in an "onscreen" drawable that can be mapped to the display. when you draw on a window, you are either going to fail (the window is not mapped), or the results show up "right away". when you draw in a pixmap, the results don't show up till you draw the pixmap into a window. a drawing area has a window, not a pixmap, as its drawable. if you want something else, then i suspect that the Canvas might be worth getting to know. does this make it any clearer? --p _______________________________________________ gtk-list mailing list [EMAIL PROTECTED] http://mail.gnome.org/mailman/listinfo/gtk-list