+ Rect abs_rect = get_absolute_rect();
+ Rect intersect = rect_intersection(abs_rect, *dirty_region);
+ if(intersect.width && intersect.height) {
+ Rect prev_clip = get_clipping_rect();
+ set_clipping_rect(abs_rect);
+
+ if(callbacks.display) {
+ callbacks.display(this);
+ }
+ dirty = false;
+
+ draw_children(abs_rect);
+
+ *dirty_region = rect_union(*dirty_region, abs_rect);
+ set_clipping_rect(prev_clip);
+ }
+}
+
+void Window::draw_children(const Rect &dirty_region)
+{
+ Rect drect = dirty_region;
+ for(size_t i=0; i<children.size(); i++) {
+ children[i]->draw(&drect);
+ }