CODEWITHSUNDEEP
pythontkinter
user2569332
user2569332

Reputation: 565

Entry Validation Extra Arguments

I have a set of entry boxes created in a for loop and recorded in a dictionary that I want to validate independently. The loop that creates them follows:

vcmd = (self.register(self.VE), '%P')
for pos in [(i,j) for i in range(9) for j in range(9)]:
            self.inputDict[pos] = tk.StringVar()
            self.entryDict[pos] = tk.Entry(font = ('Arial', 20, 'bold'),
                                           textvariable = self.inputDict[pos],
                                           borderwidth = 1, width = 2,
                                           justify = 'center',
                                           validatecommand = vcmd,
                                           validate = 'key')

And the code for self.VE is here:

def VE(self, P, pos):
    if P in [str(i) for i in map(chr,range(49,58))]:
        self.solution.insertVal(P,pos)
    elif P == '': self.solution.removeVal(pos)
    return P in [str(i) for i in map(chr,range(49,58))]+['']

My issue is that I cannot figure out how to get VE to take arguments that are not included in the list provided by this answer, duplicated below:

# valid percent substitutions (from the Tk entry man page)
# %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

I believe I'll need to make my change to the line defining vcmd, but I don't know what change to make to allow the validation command to take the position of the entry (that is, the value of pos) as well as the attempted input. How do I add an argument to the validation command that isn't in that list?

Upvotes: 1

Views: 944

Answers (1)

Bryan Oakley
Bryan Oakley

Reputation: 385880

The value you give to the validatecommand is a tuple of the registered command and any arguments you want to pass to the command. Therefore, you can do something like this:

    vcmd = self.register(self.VE)

    for pos in ...:
        self.entryDict[pos] = tk.Entry(..., 
                                       validatecommand=(vcmd, "%P", pos), 
                                       ...)
    ...

def VE(self, P, pos):
    print "P: %s pos: %s" % (P, pos)

Upvotes: 2

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