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cryptogun/validate_input_tk.py

Created October 22, 2017 07:38
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  1. cryptogun created this gist Oct 22, 2017.
    53 changes: 53 additions & 0 deletions validate_input_tk.py
    View file
    Original file line number Diff line number Diff line change
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    import tkinter as tk # python 3.x
    # import Tkinter as tk # python 2.x


    class Example(tk.Frame):

    def __init__(self, parent):
    tk.Frame.__init__(self, parent)

    # valid percent substitutions (from the Tk entry man page)
    # note: you only have to register the ones you need; this
    # example registers them all for illustrative purposes
    #
    # %d = Type of action (1=insert, 0=delete, -1 for others)
    # %i = index of char string to be inserted/deleted, or -1
    # %P = value of the entry if the edit is allowed
    # %s = value of entry prior to editing
    # %S = the text string being inserted or deleted, if any
    # %v = the type of validation that is currently set
    # %V = the type of validation that triggered the callback
    # (key, focusin, focusout, forced)
    # %W = the tk name of the widget

    vcmd = (self.register(self.onValidate),
    '%d', '%i', '%P', '%s', '%S', '%v', '%V', '%W')
    self.entry = tk.Entry(self, validate="key", validatecommand=vcmd)
    self.text = tk.Text(self, height=10, width=40)
    self.entry.pack(side="top", fill="x")
    self.text.pack(side="bottom", fill="both", expand=True)

    def onValidate(self, d, i, P, s, S, v, V, W):
    self.text.delete("1.0", "end")
    self.text.insert("end", "d='%s' type: %s\n" % (d, type(d)))
    self.text.insert("end", "i='%s' type: %s\n" % (i, type(i)))
    self.text.insert("end", "P='%s' type: %s\n" % (P, type(P)))
    self.text.insert("end", "s='%s' type: %s\n" % (s, type(s)))
    self.text.insert("end", "S='%s' type: %s\n" % (S, type(S)))
    self.text.insert("end", "v='%s' type: %s\n" % (v, type(v)))
    self.text.insert("end", "V='%s' type: %s\n" % (V, type(V)))
    self.text.insert("end", "W='%s' type: %s\n" % (W, type(W)))

    # Disallow anything but lowercase letters
    if S == S.lower():
    return True
    else:
    self.bell()
    return False


    if __name__ == "__main__":
    root = tk.Tk()
    Example(root).pack(fill="both", expand=True)
    root.mainloop()