Informatik10/tk_first_steps/traffic_light_simple_mvc.py

85 lines
2.3 KiB
Python
Raw Normal View History

2021-12-01 08:41:36 +00:00
#!/usr/bin/env python3
from tkinter import *
from tkinter import ttk
# --------------------------
# Model
# --------------------------
class TLight:
def __init__(self):
self.colors = {0: "red", 1: "yellow", 2: "green", 3: "yellow"}
self.status = 0
def switch(self):
if self.status < max(self.colors.keys()):
self.status += 1
else:
self.status = 0
def print_color(self):
print(self.colors[self.status])
def get_color(self):
return self.colors[self.status]
# --------------------------
# Controller
# --------------------------
class TLightController:
def __init__(self, app):
self.app = app
self.tlight = TLight()
def change_light(self, event=None):
self.tlight.switch()
self.update_view()
def update_view(self):
color = self.tlight.get_color()
self.app.change_light_display(color)
# --------------------------
# View / Main Application
# --------------------------
class TLightApp(Tk):
def __init__(self):
super().__init__()
self.controller = TLightController(self)
self.create_widgets()
self.create_light()
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.change_light)
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_light(self, color="red"):
self.light = self.lc.create_oval(10,10,40,40,fill=color)
def bind_events(self):
self.bind("<Return>", self.controller.change_light)
def change_light_display(self, color):
self.lc.itemconfigure(self.light, fill=color)
# --------------------------
# Execution
# --------------------------
if __name__ == "__main__":
app = TLightApp()
app.mainloop()