ui: timeout touch points (#36550)

system/ui/lib/application.py

@@ -24,6 +24,7 @@ FPS_DROP_THRESHOLD = 0.9  # FPS drop threshold for triggering a warning
 FPS_CRITICAL_THRESHOLD = 0.5  # Critical threshold for triggering strict actions
 MOUSE_THREAD_RATE = 140  # touch controller runs at 140Hz
 MAX_TOUCH_SLOTS = 2
+TOUCH_HISTORY_TIMEOUT = 3.0  # Seconds before touch points fade out
 
 ENABLE_VSYNC = os.getenv("ENABLE_VSYNC", "0") == "1"
 SHOW_FPS = os.getenv("SHOW_FPS") == "1"
@@ -69,6 +70,12 @@ class MousePos(NamedTuple):
   y: float
 
 
+class MousePosWithTime(NamedTuple):
+  x: float
+  y: float
+  t: float
+
+
 class MouseEvent(NamedTuple):
   pos: MousePos
   slot: int
@@ -162,7 +169,7 @@ class GuiApplication:
     self._should_render = True
 
     # Debug variables
-    self._mouse_history: deque[MousePos] = deque(maxlen=MOUSE_THREAD_RATE)
+    self._mouse_history: deque[MousePosWithTime] = deque(maxlen=MOUSE_THREAD_RATE)
     self._show_touches = SHOW_TOUCHES
     self._show_fps = SHOW_FPS
 
@@ -398,10 +405,16 @@ class GuiApplication:
           rl.draw_fps(10, 10)
 
         if self._show_touches:
+          current_time = time.monotonic()
+
           for mouse_event in self._mouse_events:
             if mouse_event.left_pressed:
               self._mouse_history.clear()
-            self._mouse_history.append(mouse_event.pos)
+            self._mouse_history.append(MousePosWithTime(mouse_event.pos.x, mouse_event.pos.y, current_time))
+
+          # Remove old touch points that exceed the timeout
+          while self._mouse_history and (current_time - self._mouse_history[0].t) > TOUCH_HISTORY_TIMEOUT:
+            self._mouse_history.popleft()
 
           if self._mouse_history:
             mouse_pos = self._mouse_history[-1]