add view class

frontend/views/__init__.py

@@ -0,0 +1 @@
+from .number import NumberView

frontend/views/base.py

@@ -0,0 +1,24 @@
+from tkinter import ttk, Frame, Canvas
+
+class View(Frame):
+
+    def __init__(self, *args, tare_command=None, calibrate_command=None, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        self.actions = Frame(self)
+        self.actions.pack()
+        # self.calibrate_button = ttk.Button(self.actions, text="Calibrate", command=calibrate_command)
+        # self.calibrate_button.pack()
+        self.tare_button = ttk.Button(self.actions, text="Tare", command=tare_command)
+        self.tare_button.pack()
+        
+        self.canvas = Canvas(self, width=144, height=168, background='white')
+        self.canvas.pack()
+
+        self._init_canvas()
+
+    def _init_canvas(self):
+        raise NotImplementedError()
+    
+    def update_weight(self, weight: float):
+        raise NotImplementedError()

frontend/views/number.py

@@ -0,0 +1,9 @@
+from .base import View
+
+class NumberView(View):
+
+    def _init_canvas(self):
+        self.label = self.canvas.create_text(50, 68, text="0.0 g", font=("Arial", 18), fill='black', justify='left')
+    
+    def update_weight(self, weight):
+        self.canvas.itemconfig(self.label, text=f"{weight:.1f} g")