Tkinter图像查看器应用程序-类与全局变量

我一直在关注这个Tkinter入门教程。

Link: https://www.youtube.com/watch?v=YXPyB4XeYLA

目前正在浏览图像查看器应用程序教程。

视频中的那个人使用了很多全局变量，我知道这有点不行，所以我做了同样的事情，只是使用类和类方法。 它可以工作，很棒，但是我忍不住觉得它像意大利面条一样不必要，可能有更简单的方法吗？

Note: I replaced the real directory I used with imagedirectory

from tkinter import *
from PIL import ImageTk, Image
import os

root = Tk()


class mylabel:
    def __init__(self):
        self.rty = ""
        self.imagedict = {}
        self.iNum = 0

    def removeself(self):
        self.rty.grid_forget()

    def makeyoself(self, imagenum):
        self.rty = Label(root, image=self.imagedict["image" + str(imagenum)])
        self.rty.image = self.imagedict["image" + str(imagenum)]
        self.rty.grid(row=0, column=1, columnspan=5)

    def gettheimages(self):
        os.chdir('imagedirectory')
        for a, b, c in os.walk('imagedirectory'):

            for imgs in range(len(c)):
                self.imagedict["image" + str(imgs)] = ImageTk.PhotoImage(Image.open(c[imgs]))


class buttonclass:
    def __init__(self, inrelationto):
        self.but = ""
        self.inrelationto = inrelationto
        self.notme = ""

    def makeforwarden(self):
        self.but = Button(root, text=">>", command = self.forward)
        self.but.grid(row=1,column=6)

    def makeforwarddis(self):
        self.but = Button(root, text=">>", command = self.forward, state=DISABLED)
        self.but.grid(row=1,column=6)

    def makebackwarden(self):
        self.but = Button(root, text="<<", command = self.backward)
        self.but.grid(row=1,column=0)

    def makebackwarddis(self):
        self.but = Button(root, text="<<", command = self.backward, state=DISABLED)
        self.but.grid(row=1,column=0)

    def removebut(self):
        self.but.grid_forget()

    def forward(self):
        if self.inrelationto.iNum < len(self.inrelationto.imagedict) -1:
            self.inrelationto.removeself()
            self.inrelationto.makeyoself(self.inrelationto.iNum +1)
            if self.inrelationto.iNum == 0:
                self.notme.removebut()
                self.notme.makebackwarden()
            if self.inrelationto.iNum == len(self.inrelationto.imagedict) -2:
                self.removebut()
                self.makeforwarddis()
            self.inrelationto.iNum += 1

    def backward(self):
        if self.inrelationto.iNum > 0:
            self.inrelationto.removeself()
            self.inrelationto.makeyoself(self.inrelationto.iNum - 1)
            if self.inrelationto.iNum == 1:
                self.removebut()
                self.makebackwarddis()
            if self.inrelationto.iNum == len(self.inrelationto.imagedict) - 1:
                self.notme.removebut()
                self.notme.makeforwarden()
            self.inrelationto.iNum -=1


def setup():
    pictureviewer = mylabel()
    buttonforward = buttonclass(pictureviewer)
    buttonbackward = buttonclass(pictureviewer)
    buttonforward.notme = buttonbackward
    buttonbackward.notme = buttonforward
    pictureviewer.gettheimages()

    pictureviewer.makeyoself(0)
    buttonforward.makeforwarden()
    buttonbackward.makebackwarddis()


if __name__ == '__main__':
    setup()
    root.mainloop()