I want to redraw only part of a GtkTextView widget. I make sure that application-paintable flag for the widget is turned on and connect the draw signal handler.
I tried many things for example:
GdkRectangle rect; gdk_cairo_get_clip_rectangle(cr, &rect); cairo_surface_t* surface = cairo_get_target(cr); cairo_surface_t* newsurf = cairo_surface_create_similar(surface, cairo_surface_get_content(surface), rect.width - 50, rect.height); cairo_push_group(cr); cairo_set_source_surface(cr, newsurf, rect.x + 10, rect.y + 40); cairo_fill_preserve(cr); cairo_stroke(cr); cairo_pop_group_to_source(cr); cairo_paint(cr);
except that nothing really happens. How do I re-draw only a rect of the dirty clip region in
cr or how (as I am trying) to modify
cr so that the surface area has different dimensions?