python - 如何将占位符添加到 tkinter 中的条目？

Question

我在 tkinter 中创建了一个登录窗口，它有两个输入字段，第一个是用户名，第二个是密码。
代码

from tkinter import *

ui = Tk()

e1 = Entry(ui)
#i need a placeholder "Username" in the above entry field
e1.pack()

ui.mainloop()

我想要在 Entry 中有一个名为“Username”的占位符，但是如果您在输入框内单击，文本应该会消失。

Answer 1

您可以创建一个继承自 Entry 的类，如下所示:

import tkinter as tk

class EntryWithPlaceholder(tk.Entry):
    def __init__(self, master=None, placeholder="PLACEHOLDER", color='grey'):
        super().__init__(master)

        self.placeholder = placeholder
        self.placeholder_color = color
        self.default_fg_color = self['fg']

        self.bind("<FocusIn>", self.foc_in)
        self.bind("<FocusOut>", self.foc_out)

        self.put_placeholder()

    def put_placeholder(self):
        self.insert(0, self.placeholder)
        self['fg'] = self.placeholder_color

    def foc_in(self, *args):
        if self['fg'] == self.placeholder_color:
            self.delete('0', 'end')
            self['fg'] = self.default_fg_color

    def foc_out(self, *args):
        if not self.get():
            self.put_placeholder()

if __name__ == "__main__": 
    root = tk.Tk() 
    username = EntryWithPlaceholder(root, "username")
    password = EntryWithPlaceholder(root, "password", 'blue')
    username.pack()
    password.pack()  
    root.mainloop()