Add "empty" buttons

menu.py

@@ -19,12 +19,14 @@ from screensavers import ClockScreensaver
 class ButtonDef(TypedDict):
     text: str
     cbk: Callable[[], None]
+    is_empty: bool
 
 
 class ActionType(Enum):
     MSG = auto()    # Shows a message for about 5 seconds
     GET = auto()    # Performs a HTTP GET
     QUIT = auto()   # Quits an application
+    EMPTY = auto()  # Shows nothing instead of a button
 
 
 class Action(TypedDict):
@@ -56,7 +58,7 @@ class MultilineText:
             current_top += rect.top + self.VMARGIN
 
 
-class Button:
+class Button(IBoard):
     PRESS_OFFSET = 2
     HOVER_ANIMATION_STEPS = 5
 
@@ -108,7 +110,7 @@ class Button:
                                self.text_pos.width, self.text_pos.height)
         return self.text_pos
 
-    def draw(self, screen: pygame.Surface):
+    def draw(self, screen: pygame.Surface, _):
         pygame.draw.rect(screen, self.get_bg_color(), self.get_position(), 0)
         self.label.render_to(screen, self.get_text_pos(), self.theme["btn_text_color"])
 
@@ -147,13 +149,22 @@ class MenuBoard(IBoard):
     BUTTON_MARGINS = 10
 
     def __init__(self, screen_rect: pygame.Rect, buttons: List[ButtonDef], theme: Dict):
+        def generate_buttons(button_positions_generator):
+            def impl(data: ButtonDef) -> Optional[IBoard]:
+                if data['is_empty']:
+                    next(button_positions)
+                    return None
+                else:
+                    return Button(next(button_positions), data['text'], theme, data['cbk'])
+            return impl
+
         self.rows = math.floor(math.sqrt(len(buttons)))
         self.cols = math.ceil(math.sqrt(len(buttons)))
         if (self.rows * self.cols) < len(buttons):
             # extra row if buttons don't fit
             self.rows += 1
         button_positions = self.generate_button_positions(screen_rect)
-        self.buttons = list(map(lambda d: Button(next(button_positions), d['text'], theme, d['cbk']), buttons))
+        self.buttons = list(filter(lambda x: x is not None, map(generate_buttons(button_positions), buttons)))
         self.theme = theme
 
     def generate_button_positions(self, screen_rect: pygame.Rect):
@@ -178,7 +189,7 @@ class MenuBoard(IBoard):
         if force_redraw or any(map(Button.needs_redrawing, self.buttons)):
             screen.fill(self.theme["menu_bg_color"])
             for b in self.buttons:
-                b.draw(screen)
+                b.draw(screen, force_redraw)
 
 
 class App:
@@ -197,7 +208,10 @@ class App:
         self.clock = pygame.time.Clock()
         self.running = False
         self.theme = theme
-        buttons = list(map(lambda u: ButtonDef(text=u['label'], cbk=self.button_press_handler(u)), actions))
+        buttons = list(map(lambda u: ButtonDef(text=u['label'],
+                                               cbk=self.button_press_handler(u),
+                                               is_empty=(u['action_type'] == ActionType.EMPTY)),
+                           actions))
         self.board: IBoard = MenuBoard(self.get_screen_rect(), buttons, theme)
         self.task_q = Queue()
         self.screensaver = ClockScreensaver()
@@ -261,6 +275,8 @@ class App:
             return self.get_handler(action)
         elif action['action_type'] == ActionType.QUIT:
             return self.quit
+        elif action['action_type'] == ActionType.EMPTY:
+            return lambda: print("Tried to do an action on EMPTY - shouldn't happen")
         raise NotImplementedError(action['action_type'])
 
     def loop(self):
@@ -307,7 +323,7 @@ class App:
 def get_url_defs(config_data: dict) -> List[Action]:
     url_defs = []
     for d in data['actions']:
-        url_defs.append(Action(label=d['label'],
+        url_defs.append(Action(label=d.get('label'),
                                action_type=ActionType[d['action_type']],
                                action_param=d.get('action_param'),
                                action_message=str(d.get('action_message'))))