#!/usr/bin/env python3
from tkinter import *

class WelcomeFrame(Frame):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.root = args[0]

        # content
        self.welcome_text = Label(self, text="Hello, this is my new application!", height=10, anchor="n")
        self.welcome_text.pack(padx=5, pady=5)

        # frame changer logic
        self.next_button = Button(self, text="Next", command=self.root.nextFrame)
        self.next_button.pack(side="right")

class State0Frame(Frame):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.root = args[0]

        # content
        self.welcome_text = Label(self, text="You currently see the page 2", height=10, anchor="n")
        self.welcome_text.pack(padx=5, pady=5)

        # frame changer logic
        self.next_button = Button(self, text="Next", command=self.root.nextFrame)
        self.next_button.pack(side="right")

class State1Frame(Frame):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.root = args[0]

        # content
        self.welcome_text = Label(self, text="And now, you see the last page", height=10, anchor="n")
        self.welcome_text.pack(padx=5, pady=5)

        # frame changer logic
        self.next_button = Button(self, text="Next", command=self.root.nextFrame)
        self.next_button.pack(side="right")

    def changeNextButton(self):
        "This is calld from the parent because this is the last Frame"
        self.next_button.configure(text="Kilépés", command=self.root.destroy)

class App(Tk):
    def __init__(self):
        super().__init__()

        # just for test
        self.title("Teszt")
        self.minsize(230, 220)
        self.maxsize(230, 220)

        self.current_frame = None
        self.current_state = 0 # this will keep the current state of the Frames

        if not self.createFrames(): raise Exception("I could not create instances")
        self.setFrame(self.current_state)

    def createFrames(self) -> bool:
        "Creates and saves the different kind of Frames' instances"
        self.app_frames = []
        wanted_frames = [WelcomeFrame, State0Frame, State1Frame]

        for child in wanted_frames:
            self.app_frames.append(child) # this is currently a lil bit ugly but this is just for reprezenntation

        return True

    def setFrame(self, index_of_new_frame, last = False):
        "This sets the new Frame every time when you use the next button"
        if self.current_frame is not None: self.current_frame.pack_forget() # or grid or whatver

        self.current_frame = self.app_frames[index_of_new_frame](self)
        if last: self.current_frame.changeNextButton()

        self.current_frame.pack() # or grid or whatever, but remind if you change this geometry manager you will have to change the forgeting method too

    def nextFrame(self):
        "This is the func what is called from 'outside'"
        c_app_frame = len(self.app_frames)
        next_frame = self.current_state + 1
        last_frame = False

        if next_frame < c_app_frame:
            self.current_state += 1
            if next_frame + 1 == c_app_frame: last_frame = True

            self.setFrame(next_frame, last_frame)
        else:
            pass # do something to notice the user

if __name__ == "__main__":
    main_app = App()
    main_app.mainloop()