+ if(dirty_rects.empty()) {
+ return;
+ }
+
+ std::list<Rect>::iterator drit = dirty_rects.begin();
+ Rect uni = *drit++;
+ while(drit != dirty_rects.end()) {
+ uni = rect_union(uni, *drit++);
+ }
+ dirty_rects.clear();
+
+ fill_rect(uni, bg_color[0], bg_color[1], bg_color[2]);
+
+ root_win->draw_children(uni);
+
+ // draw mouse cursor
+ int mouse_x, mouse_y;
+ get_pointer_pos(&mouse_x, &mouse_y);
+
+ blit_key(mouse_cursor.get_image(), mouse_cursor.get_rect(),
+ get_framebuffer(), get_screen_size(), mouse_x, mouse_y,
+ 0, 0, 0);
+
+ Rect mouse_rect = {mouse_x, mouse_y, mouse_cursor.get_width(), mouse_cursor.get_height()};
+ invalidate_region(mouse_rect);
+
+ gfx_update();
+}
+
+void WindowManager::add_window(Window *win)
+{
+ if(!win || win == root_win) {
+ return;
+ }
+
+ root_win->add_child(win);
+
+ if(windows.empty()) {
+ focused_win = win;
+ }
+
+ if(win->get_managed()) {
+ create_frame(win);
+ }
+
+ windows.push_back(win);
+}
+
+void WindowManager::remove_window(Window *win)
+{
+ std::list<Window*>::iterator it;
+ it = std::find(windows.begin(), windows.end(), win);
+
+ if(it != windows.end()) {
+ windows.erase(it);
+ }
+}
+
+void WindowManager::set_focused_window(Window *win)
+{
+ 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;
+}
+
+const Window *WindowManager::get_focused_window() const
+{
+ return focused_win;
+}
+
+Window *WindowManager::get_focused_window()
+{
+ return focused_win;
+}
+
+Window *WindowManager::get_window_at_pos(int pointer_x, int pointer_y)
+{
+ std::list<Window*>::reverse_iterator rit = windows.rbegin();
+ while(rit != windows.rend()) {
+ Window *w = *rit++;
+ Window *parent = w->get_parent();
+
+ if(parent == root_win && w->contains_point(pointer_x, pointer_y)) {
+ return w;