add a menu with bt pairing

frontend/views/menu.py

@@ -0,0 +1,61 @@
+from typing import Tuple
+
+from .base import View
+from .button_interface import ButtonInterface
+from .list_select import ListItem, CarouselView
+
+from PIL import ImageDraw, Image
+
+
+def _make_text_item(text):
+    return ListItem(lambda draw, pos, fill, t=text, **kw: draw.text(pos, str(t), fill=fill, **kw))
+
+
+class MenuView(View, ButtonInterface):
+
+    def __init__(self, parent, im_size, center,
+                 bluetooth_pair_command=None,
+                 deactivate_command=None):
+        self.deactivate_command = deactivate_command
+        self.bluetooth_pair_command = bluetooth_pair_command
+        self.item_list = CarouselView(render_height=124, large_font_size=20)
+        self._actions = [
+            ("BT Pair", self.bluetooth_pair_command),
+        ]
+        self.item_list.items = [_make_text_item(label) for label, _ in self._actions]
+        super().__init__(parent, im_size, center)
+
+    def update_weight(self, weight: float) -> Image.Image:
+        im = self.bkg_im.copy()
+        draw = ImageDraw.Draw(im)
+        self.item_list.render(draw, y_start=10)
+        return im
+
+    def left_press(self):
+        self.item_list.select_previous()
+
+    def left_long_press(self):
+        self.deactivate_command()
+
+    def right_press(self):
+        self.item_list.select_next()
+
+    def right_long_press(self):
+        _, action = self._actions[self.item_list.selected_index]
+        if action:
+            action()
+
+    def has_button(self) -> Tuple[bool, bool, bool, bool]:
+        return True, True, True, True
+
+    def render_left_press(self, draw, x, y):
+        draw.regular_polygon((x, y + 2, 5), 3, fill='black')
+
+    def render_left_long_press(self, draw, x, y):
+        draw.text((x, y - 5), 'Back', fill='black')
+
+    def render_right_press(self, draw, x, y):
+        draw.regular_polygon((x, y + 4, 5), 3, fill='black', rotation=180)
+
+    def render_right_long_press(self, draw, x, y):
+        draw.text((x - 30, y - 5), 'Select', fill='black')