+ if(win == focused_win) {
+ return;
+ }
+
+ if(focused_win) {
+ // invalidate the frame (if any)
+ Window *parent = focused_win->get_parent();
+ if(parent && parent != root_win) {
+ parent->invalidate();
+ }
+ }
+
+ if(!win) {
+ focused_win = 0;
+ return;
+ }
+
+ if(win->get_focusable()) {
+ focused_win = win;
+ return;
+ }
+
+ Window **children = win->get_children();
+ for(int i=0; i<win->get_children_count(); i++) {
+ if(children[0]->get_focusable()) {
+ set_focused_window(children[0]);
+ return;
+ }
+ }
+
+ focused_win = 0;