Myujth

I am trying to create a 2 mins countdown app with multiple windows. I am putting all windows(frames) into the main container, and then use tkraise() to raise the frame whenever the navigation button to specific window is clicked(eg:'startPage' frame will be raised if 'back to startPage' button is clicked).
The code below works well only when the object of class PracticePage was first created.
However, the timer is still running at the back when I navigate from the countdown timer frame(class PracticePage) to another page. In other words, the timer will not count down from 2 mins whenever I navigate from another page back to the countdown timer page. I want it to countdown from 2 mins whenever the timer frame is raised.
I am a beginner in programming. I apologized if my question and code is confusing. Can someone help? Thank you in advance.

Below is my code:

import tkinter as tk
from tkinter import *
from tkinter import ttk
import time

class App(tk.Tk): #we want this class to inherit from tk.Tk
 def __init__(self, *args, **kwargs): 
 tk.Tk.__init__(self, *args, **kwargs)

 tk.Tk.wm_title(self,"PreSys")

 container = tk.Frame(self, height = 1000, width =1000)
 container.pack(side="top", fill="both", expand = True)

 container.grid_rowconfigure(0, weight=1)
 container.grid_columnconfigure(0, weight=1)

 self.frames = 

 for F in (SignInPage, StartPage, PracticePage):

 frame = F(container, self)

 self.frames[F] = frame

 frame.grid(row=0, column=0, sticky="nsew")

 self.show_frame(SignInPage)

 def show_frame(self, cont):
 frame = self.frames[cont]
 frame.tkraise() #to raise one of the frames up to the front 


class StartPage(tk.Frame):
 def __init__(self, parent, controller):
 tk.Frame.__init__(self, parent)


 self.startButton = ttk.Button(self, text="スタート", command = lambda: controller.show_frame(PracticePage))

 self.startButton.pack()

class PracticePage(tk.Frame):
 def __init__(self, parent, controller):
 tk.Frame.__init__(self, parent)
 self.timeLeft = tk.Label(self,text= "")
 self.backButton = ttk.Button(self, text="やり直す", command = lambda: controller.show_frame(StartPage))
 self.homeButton = ttk.Button(self, text="サインアウト", command = lambda: controller.show_frame(SignInPage))

 self.timeLeft.pack()
 self.backButton.pack()
 self.homeButton.pack()
 #rc.start_record(SignInPage.entry_name.get())

 self.remaining = 0
 self.countdown(121)

 def countdown(self, remaining = None):
 if remaining is not None:
 self.remaining = remaining

 if self.remaining <= 0:
 self.timeLeft.configure(text="お疲れ様です！")
 else:
 mins, secs = divmod(self.remaining,60)
 mins = round(mins)
 secs = round(secs)
 self.timeLeft.configure(text=str(mins) +"分"+ str(secs) +"秒")
 self.remaining = self.remaining - 1
 self.after(1000, self.countdown)

apps = App()
apps.mainloop()

Before we get to the solution, when you supply your code make sure it works. You removed the SignInPage because it wasn't necessary, but you didn't follow up and remove the other references to it (i.e.- self.show_frame(SignInPage) in App.__init__ and self.homebutton in PracticePage.

As for your issue with resetting the timer, there are many ways to go about it, but they all come down to the fact that all you are doing is raising frames: you don't include any code that influences countdown based on what frame you are currently switching to.

Since this is a relatively simple application, I'll suggest the simplest solution: when you raise PracticePage reset its remaining variable. To keep it as easy and consistent as possible, we'll just modify show_frame

## You should store variables that are meaningful (you can place this underneath the imports)
PRACTICETIME = 121

## App():
 def show_frame(self, cont):
 frame = self.frames[cont]
 if cont == PracticePage:
 frame.remaining = PRACTICETIME
 frame.tkraise() #to raise one of the frames up to the front

In a larger application I would recommend either using widget.after_cancel() to stop the countdown completely or simply to destroy and recreate your Pages if reasonable to do so. With this method you may notice a 1-second lag where the PracticePage is still displaying the previous remaining time: if this really bothers you, then I would recommend extracting the code that formats PracticePage.timeLeft into its own function and then calling that function from App.show_frame right after you set remaining.