如何在不同的类中使用条目内容？

Question

我希望这不是重复的，看来我是少数喜欢将 Tkinter 用作 Tkinter 而不是 TK 的人之一...... 所以几乎我正在使用类来制作窗户。第二个窗口创建了一个用户，但我在不同的类中使用该值“用户名”时遇到了问题。 我错过了什么？

（免责声明，窗户很丑，我专注于使功能正常工作。） 我已经尝试将值 username 设置为 clicku() 函数的全局部分....如此处所示）...我已经将它移动了，尝试与当地合作...我迷路了。将条目设为自己的类会保存这个问题吗？？？？

from tkinter import *


class Window(Frame):

    def __init__(self, master=None, *args, **kwargs):
        Frame.__init__(self,master,*args,**kwargs)
        self.pack()
        self.pack_propagate(0)
        self.labelone = Label(self, text = "Welcome to our class! Click start to begin")
        self.labelone.grid(row=1,column=1)
        self.buttonone = Button(self, text="start", command=click)
        self.buttonone.grid(row=2,column=1)


class Startwindow(Frame):

    def __init__(self, master=None, *args, **kwargs):
        Frame.__init__(self,master,*args,**kwargs)
        self.grid(row=5,column=5)
        self.grid_propagate(0)
        self.text = Label(self, text = "What is your name?")
        self.text.grid(row=0,column=0)
        self.entry = Entry(self, width=15)
        self.entry.grid(row=1,column=0)
        self.buttontwo = Button(self, text="enter", command=clicku)
        self.buttontwo.grid(row=1,column=1)
        self.username = self.entry.get()



class introwindow(Frame):

    def __init__(self, master=None,*args,**kwargs):
        Frame.__init__(self,master,*args,**kwargs)
        user = str(w2.username)
        self.grid()
        self.grid_propagate(0)
        self.a = Label(self, text = "Aki: ")
        self.a.grid(row = 0, column = 0)
        self.sp1 = Label(self, text = "Hi" + w2.username)
        self.sp1.grid(row = 0, column = 1)
        self.sp2 = Label(self, text = "Nice to meet you!")
        self.sp1.grid(row = 1, column = 1)
        self.talk = Entry(self, width = 15)


def click():
    global w2
    w.destroy()
    w2 = Startwindow(root,width=500,height=500)


def clicku():
    w2.destroy()
    w3 = introwindow(root,width=500,height=500)






root = Tk()
w = Window(root, bg="red",width=500,height=500)

root.mainloop()

我只是希望在introwindow 中打印用户名，作为Label sp1 的一部分。

Answer 1

您可以通过创建 tkinter StringVar 的全局实例来实现。这是对您问题中发布的代码执行此操作（我也已更新以更密切地关注PEP 8 - Style Guide for Python Code）。

您当前的设计不允许充分利用它们（这就是我将其设为全局变量的原因）。但为了将来参考，这里有一些关于如何使用它们的additional information。

from tkinter import *


class Window(Frame):
    def __init__(self, master=None, *args, **kwargs):
        Frame.__init__(self, master, *args, **kwargs)
        self.pack()
        self.pack_propagate(0)
        self.labelone = Label(self, text="Welcome to our class! Click start to begin")
        self.labelone.grid(row=1, column=1)
        self.buttonone = Button(self, text="start", command=click)
        self.buttonone.grid(row=2,column=1)


class StartWindow(Frame):
    def __init__(self, master=None, *args, **kwargs):
        Frame.__init__(self, master, *args, **kwargs)
        self.grid(row=5,column=5)
        self.grid_propagate(0)
        self.text = Label(self, text="What is your name?")
        self.text.grid(row=0,column=0)
        self.entry = Entry(self, width=15, textvariable=username)
        self.entry.grid(row=1,column=0)
        self.buttontwo = Button(self, text="enter", command=clicku)
        self.buttontwo.grid(row=1,column=1)
        self.username = self.entry.get()


class IntroWindow(Frame):
    def __init__(self, master=None, *args, **kwargs):
        Frame.__init__(self,master, *args, **kwargs)
        self.grid()
        self.grid_propagate(0)
        self.a = Label(self, text="Aki: ")
        self.a.grid(row=0, column=0)
        self.sp1 = Label(self, text="Hi " + username.get())
        self.sp1.grid(row=0, column=1)
        self.sp2 = Label(self, text="Nice to meet you!")
        self.sp1.grid(row=1, column=1)
        self.talk = Entry(self, width=15)


def click():
    global w2
    w.destroy()
    w2 = StartWindow(root, width=500, height=500)


def clicku():
    w2.destroy()
    w3 = IntroWindow(root, width=500, height=500)


if __name__ == '__main__':

    root = Tk()
    username = StringVar()
    w = Window(root, bg="red", width=500, height=500)

    root.mainloop()

Answer 2

由于您的入口小部件是introwindow 的属性，您只需在销毁窗口之前 调用入口小部件上的get 方法。然后可以将值传递给下一个窗口的构造函数

例如，它看起来像这样：

def clicku():
    name = w2.entry.get()
    print("clickU:", name)
    w2.destroy()
    w3 = IntroWindow(root, width=500, height=500, name=name)

当然，您需要修改 IntroWindow 类以接受该名称。