I am an experienced programmer learning perl by writing a sudoku program and it has gone very well. I am upgrading the cell edit routine (one of a 9x9 matrix) to make it cleaner and am having some trouble. Each cell is square and has 2 lines of up to 5 chars each currently using Tk::text.

I am having trouble filtering out not-allowed chars such as [a..zA..Z] and punctuation chars. I would like a "-validation" command callback like tk::entry has, but I need 2 lines of text. I have read up on bind and bindkey, but they tend to get too kludgy itemizing all the chars to filter out. I need to allow only [1..9], up, down, left, and right and block all else.

I need advice on which approach to use:

1. use the text widget with object/instance binding to bind all the unwanted chars?.

2. text widget subclassing, with text->InsertKeypress() method overridden with some filtering?

3.somehow make the entry widget work in pairs to simulate 2 lines with the first "flowing" into the second? (I have not researched this yet)

4.Some other widget or approach that I don't know about?

If you have any suggestions or words of wisdom, I would be grateful. Thanks -Eugene

In reply to Filtering/validating Tk::text input by NatureFocus

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