Improve highlighting structure

- switched to a sparse delta based map
- true lazy-loading to avoid any unneccessary allocations
- fixed windows management api

src/windows/renderer.cc

@@ -1,23 +1,49 @@
+#include "io/sysio.h"
 #include "main.h"
 #include "windows/decl.h"
 
-TileRoot root_tile;
-std::vector<std::unique_ptr<TileRoot>> popups;
+namespace layout {
+TileBase root_tile;
 Window *focused_window;
+std::vector<std::unique_ptr<Popup>> popups;
+std::vector<std::unique_ptr<TileBase>> floating_tiles;
+} // namespace layout
 
 void render() {
-  ui::bar.render(new_screen);
-  root_tile.render(new_screen);
-  for (auto &popup : popups)
-    popup->render(new_screen);
+  ui::bar.render(io::new_screen);
+  layout::root_tile.render(io::new_screen);
+  for (auto &tile : layout::floating_tiles) {
+    if (tile->hidden())
+      continue;
+    tile->render(io::new_screen);
+  }
+  for (auto &popup : layout::popups) {
+    if (popup->hidden)
+      continue;
+    popup->render(io::new_screen, popup->size, popup->pos);
+  }
 }
 
 void handle_click(KeyEvent event) {
-  for (auto &popup : popups) {
-    if (popup->inside(event.mouse_x, event.mouse_y)) {
-      popup->handle_click(event);
+  for (auto &popup : layout::popups) {
+    if (!popup->hidden &&
+        inside({event.mouse_y, event.mouse_x}, popup->pos, popup->size)) {
+      event.mouse_x -= popup->pos.col;
+      event.mouse_y -= popup->pos.row;
+      popup->handle_click(event, popup->size);
       return;
     }
   }
-  root_tile.handle_click(event);
+  for (auto &tile : layout::floating_tiles) {
+    if (!tile->hidden() &&
+        inside({event.mouse_y, event.mouse_x}, tile->pos, tile->size)) {
+      event.mouse_x -= tile->pos.col;
+      event.mouse_y -= tile->pos.row;
+      tile->handle_click(event);
+      return;
+    }
+  }
+  if (inside({event.mouse_y, event.mouse_x}, layout::root_tile.pos,
+             layout::root_tile.size))
+    layout::root_tile.handle_click(event);
 }