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- # Click Counter
- # Demonstrates binding an event with an event handler
- print("Step 0 First line to run")
- from tkinter import *
- # main
- print("Step 1 root =Tk Setup root window")
- root = Tk()
- print("Step 2 Setup window title : Click Counter")
- root.title("Click Counter")
- print("Step 3 Setup : Size root.geometry")
- root.geometry("200x50")
- class Application(Frame):
- print("Step 4 Next, Entered the : class Application(Frame):")
- print("")
- print("This step is not clear to me?")
- print(""" Normally would see:
- root = Tk() #This would create the base window
- frame = Frame(root) #The frame lives in the base window
- frame.pack() #Places the frame in the window
- BUT we see instead:
- root = Tk() #This would create the base window
- app = Application(root) #Not sure what is going on with this line?
- #If I had to guess app = frame and
- #Application=Frame
- #Meaning frame and Frame are not keywords
- class Application(Frame):#Also not sure with this line?
- #Understood creating Class from which
- #an instance will be created as an object.
- #The use of Frame has me confused?
- """)
- def __init__(self, master):
- print("Step 5 Entered : def __init__(self, master):")
- print("Why is .......................^self, master used here?")
- print("""Step 6 Next run : super(Application, self).__init__(master) """)
- super(Application, self).__init__(master)
- self.grid()
- print("Step 7 SET : self_bttn_clicks = 0")
- self.bttn_clicks = 0
- print("Step 8 CALL: self.create_widget()")
- self.create_widget()
- def update_count(self):
- print("Step 9 Entered : def update_count(self):")
- print("""Step 10 Increase click count and display new total. """)
- self.bttn_clicks += 2
- self.bttn["text"] = "Total Clicks: " + str(self.bttn_clicks)
- def create_widget(self):
- print("Step 11 Entered : def create_widget(self):")
- print("""Step 12 Create button which displays number of clicks. """)
- self.bttn = Button(self)
- self.bttn["text"]= "Total Clicks: 0"
- self.bttn["command"] = self.update_count
- self.bttn.grid()
- app = Application(root)
- print("Step 13 root_mainloop")
- root.mainloop()
- print("Step 14 root_mainloop")
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