twolights added

tk_first_steps/two_lights_simple_mvc.py

@@ -0,0 +1,99 @@
+#!/usr/bin/env python3
+from tkinter import *
+from tkinter import ttk
+
+# --------------------------
+# Model
+# --------------------------
+class DoubleLight:
+    def __init__(self):
+        self.l1 = 1
+        self.l2 = 0
+        
+    def switch(self):
+        if self.l1 == 1:
+            self.set_l2()
+        else:
+            self.set_l1()
+            
+    def set_l1(self):
+        self.l1 = 1
+        self.l2 = 0
+        
+    def set_l2(self):
+        self.l1 = 0
+        self.l2 = 1
+            
+    def print_status(self):
+        print("l1: " + str(self.l1) + "| l2: " + str(self.l2))
+        
+    def get_active(self):
+        if self.l1 == 1:
+            return 1
+        else:
+            return 2
+    
+# --------------------------
+# Controller
+# --------------------------
+class TwoLightsController:
+    def __init__(self, app):
+        self.app = app
+        self.lights = DoubleLight()
+        
+    def switch_lights(self, event=None):
+        self.lights.switch()
+        self.update_view()
+        
+    def update_view(self):
+        active_light = self.lights.get_active()
+        self.app.change_light_display(active_light)
+
+# --------------------------
+# View / Main Application
+# --------------------------
+class TwoLightsApp(Tk):
+    def __init__(self):
+        super().__init__()
+        self.controller = TwoLightsController(self)
+        
+        self.color1 = "dark green"
+        self.color2 = "green yellow"
+        
+        self.create_widgets()
+        self.create_lights(self.color1)
+        self.bind_events()
+        
+    def create_widgets(self):
+        mainframe = ttk.Frame(self, padding="3 3 3 3")
+        mainframe.grid(column=0, row=0, sticky=N+W+S+E)
+        self.columnconfigure(0, weight=1)
+        self.rowconfigure(0, weight=1)
+        button_switch = ttk.Button(mainframe, text="Schalte um", command=self.controller.switch_lights)
+        button_switch.grid(column=0, row=0, sticky=W)
+        light_canvas = Canvas(mainframe, width=50, height=50, background="black")
+        light_canvas.grid(column=1, row=0, sticky=W)
+        self.lc = light_canvas
+        
+    def create_lights(self, color="dark green"):
+        self.light1 = self.lc.create_rectangle(5,5,25,45,fill=color)
+        self.light2 = self.lc.create_rectangle(25,5,45,45,fill=color)
+        self.controller.update_view()
+        
+    def bind_events(self):
+        self.bind("<Return>", self.controller.switch_lights)
+    
+    def change_light_display(self, active_light):
+        if active_light == 1:
+            self.lc.itemconfig(self.light1, fill=self.color2)
+            self.lc.itemconfig(self.light2, fill=self.color1)
+        else:
+            self.lc.itemconfig(self.light1, fill=self.color1)
+            self.lc.itemconfig(self.light2, fill=self.color2)
+        
+# --------------------------
+# Execution
+# --------------------------
+if __name__ == "__main__":
+    app = TwoLightsApp()
+    app.mainloop()