Tkinter 的 Entry 对其进行输入的文本进行实时的validation 

 1 try:
 2     # python 3.x
 3     import tkinter as tk
 4 except ImportError:
 5     # python 2.x
 6     import Tkinter as tk
 7 
 8 class Example(tk.Frame):
 9 
10     def __init__(self, parent):
11         tk.Frame.__init__(self, parent)
12 
13         # valid percent substitutions (from the Tk entry man page)
14         # %d = Type of action (1=insert, 0=delete, -1 for others)
15         # %i = index of char string to be inserted/deleted, or -1
16         # %P = value of the entry if the edit is allowed
17         # %s = value of entry prior to editing
18         # %S = the text string being inserted or deleted, if any
19         # %v = the type of validation that is currently set
20         # %V = the type of validation that triggered the callback
21         #      (key, focusin, focusout, forced)
22         # %W = the tk name of the widget
23 
24         vcmd = (self.register(self.onValidate),
25                 '%d', '%i', '%P', '%s', '%S', '%v', '%V', '%W')
26         self.entry = tk.Entry(self, validate="key", validatecommand=vcmd)
27         self.text = tk.Text(self, height=10, width=40)
28         self.entry.pack(side="top", fill="x")
29         self.text.pack(side="bottom", fill="both", expand=True)
30 
31     def onValidate(self, d, i, P, s, S, v, V, W):
32         self.text.delete("1.0", "end")
33         self.text.insert("end","OnValidate:\n")
34         self.text.insert("end","d='%s'\n" % d)
35         self.text.insert("end","i='%s'\n" % i)
36         self.text.insert("end","P='%s'\n" % P)
37         self.text.insert("end","s='%s'\n" % s)
38         self.text.insert("end","S='%s'\n" % S)
39         self.text.insert("end","v='%s'\n" % v)
40         self.text.insert("end","V='%s'\n" % V)
41         self.text.insert("end","W='%s'\n" % W)
42 
43         # Disallow anything but lowercase letters
44         valid = (S.lower() == S)
45         if not valid:
46             self.bell()
47         return valid
48 
49 if __name__ == "__main__":
50     root = tk.Tk()
51     Example(root).pack(fill="both", expand=True)
52     root.mainloop()

 

posted on 2016-06-17 23:59  f00ly  阅读(1360)  评论(0)    收藏  举报

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