start implementation of recipe selection

frontend/views/recipe_selection.py

@@ -0,0 +1,67 @@
+from typing import Tuple
+
+from .base import View
+from .button_interface import ButtonInterface
+
+from PIL import ImageDraw, Image
+
+class RecipeSelection(View, ButtonInterface):
+
+    recipes = [
+        "Recipe 1",
+        "Recipe 2",
+    ]
+
+    def __init__(self, parent, im_size, center):
+        self.selected_index = 0
+        super().__init__(parent, im_size, center)
+
+    def _get_visual_recipes(self):
+        recipes = self.recipes + ['+']
+        if len(self.recipes) < 5:
+            return recipes, 0
+        start = max(0, self.selected_index - 2)
+        end = min(len(recipes), start + 5)
+
+        recipes = recipes[start:end]
+        if len(recipes) < 5:
+            recipes += ['+']
+
+        return recipes, start
+
+    def update_weight(self, weight: float) -> Image.Image:
+        im = self.bkg_im.copy()
+        draw = ImageDraw.Draw(im)
+
+        recipes, start = self._get_visual_recipes()
+        for idx, recipe in enumerate(recipes):
+            if idx + start == self.selected_index:
+                draw.rectangle((35, 8 + idx * 20, 130, 25 + idx * 20), fill='black')
+                draw.text((40, 10 + idx * 20), recipe, fill='white')
+            else:
+                draw.text((40, 10 + idx * 20), recipe, fill='black')
+
+        
+        return im
+
+    def left_press(self):
+        self.selected_index = (self.selected_index - 1) % (len(self.recipes) + 1)
+
+    def right_press(self):
+        self.selected_index = (self.selected_index + 1) % (len(self.recipes) + 1)
+
+
+    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):
+        pass
+
+    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):
+        pass