[Tkinter] Validating and modifying a Spinbox

[pfdjhfuys]

Hi,

Would like to share a link to the complete solution: PasswordGeneratorGUI.

The SpinBox control proved particularly challenging to fine tune it to where I wanted to get it.

The up and down arrows always worked as expected but I was never able to easily manage if someone typed in an invalid string in the box. I was expecting that if someone typed in, dd, I could capture an onChange or onFocusLost event out of the box and take corrective action.

I found that pressing Tab did not cause the SpinBox to loose focus (even though the cursor would jump).

The lines below seem to have done the trick.

        self.root.bind('<Return>', self.reset_focus)
        self.root.bind('<Tab>', self.reset_focus)

Still not sure whether it could have been achieved without the need to code them in (they are built into the tool).

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Another observation is that the name of the spinbox I define in python is different from that in Tcl/tk (widget) and I can't figure out how to get from the python name to the internal equivalent. Can one get to this via

(self.root.register(self.ValidateIfNum),'%P', '[b]%W[/b]')

?

With one spinbox the solution is manageable.

Thanks for any comments