我想要一个用于输入日期的输入框,以便用户只能以一种方式输入。
输入前的输入框看起来像这样(不带下划线)__/__/____
,并且/
在用户输入日期时不会删除 's。
谢谢
感谢@Bryan Oakley 的主要提示,我想出了这个工作代码。
(更新:投入了几年的编程经验和一些最近的读者对改进代码的敏锐眼光。)
from __future__ import print_function
try:
import Tkinter as tk
except ImportError:
import tkinter as tk
class DateEntry(tk.Frame):
def __init__(self, master, frame_look={}, **look):
args = dict(relief=tk.SUNKEN, border=1)
args.update(frame_look)
tk.Frame.__init__(self, master, **args)
args = {'relief': tk.FLAT}
args.update(look)
self.entry_1 = tk.Entry(self, width=2, **args)
self.label_1 = tk.Label(self, text='/', **args)
self.entry_2 = tk.Entry(self, width=2, **args)
self.label_2 = tk.Label(self, text='/', **args)
self.entry_3 = tk.Entry(self, width=4, **args)
self.entry_1.pack(side=tk.LEFT)
self.label_1.pack(side=tk.LEFT)
self.entry_2.pack(side=tk.LEFT)
self.label_2.pack(side=tk.LEFT)
self.entry_3.pack(side=tk.LEFT)
self.entries = [self.entry_1, self.entry_2, self.entry_3]
self.entry_1.bind('<KeyRelease>', lambda e: self._check(0, 2))
self.entry_2.bind('<KeyRelease>', lambda e: self._check(1, 2))
self.entry_3.bind('<KeyRelease>', lambda e: self._check(2, 4))
def _backspace(self, entry):
cont = entry.get()
entry.delete(0, tk.END)
entry.insert(0, cont[:-1])
def _check(self, index, size):
entry = self.entries[index]
next_index = index + 1
next_entry = self.entries[next_index] if next_index < len(self.entries) else None
data = entry.get()
if len(data) > size or not data.isdigit():
self._backspace(entry)
if len(data) >= size and next_entry:
next_entry.focus()
def get(self):
return [e.get() for e in self.entries]
if __name__ == '__main__':
win = tk.Tk()
win.title('DateEntry demo')
dentry = DateEntry(win, font=('Helvetica', 40, tk.NORMAL), border=0)
dentry.pack()
win.bind('<Return>', lambda e: print(dentry.get()))
win.mainloop()
我发现了一个非常简单的解决方案。我希望有人能发现它有用。
self.entry1=tk.Entry(self)
self.entry1.insert(END, " / / ")
self.entry1.config(fg="grey")
def datemask(self, event):
if len(self.entry1.get()) is 2:
self.entry1.insert(END,"/")
elif len(self.entry1.get()) is 5:
self.entry1.insert(END,"/")
elif len(self.entry1.get()) is 11:
self.entry1.delete(10, END)
绑定入口小部件
self.entry1.bind('<KeyRelease>', self.datemask)