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Clayton L. Wilson · Guest

Greetings everyone,
I wonder if I can get some help. I need a TRichEdit component that doesn't
allow for more text to be inserted or typed than what the window will hold.
For example, My TRichEdit component is sized to allow 5 lines by 32
characters (fixed width) only. How do I do this?
Thanks.
--
Clayton L. Wilson

Alexander Bauer · Guest

Hi,

Maybe this works:

Write a new TRichEdit derived from TRichEdit and check the count of chars
per line and the count of lines when a key is pressed.

Or use the Windows Edits callback function "EditWordBreakProc" (An
application-defined callback function used with the EM_SETWORDBREAKPROC
message) and the message EM_SETLIMITTEXT (32x5 = 160 Chras maximum) (See
Win32.hlp or MS Platform SDK for mor information).

I hope this can help you,

Regards,
Alexander Bauer

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D Whaley · Guest

You can just test the TextEntent of the Canvas in an OnKeyDown event and
block input if it exceeds it.

Alexander Bauer · Guest

Hi D Whaley,

OK, thats possible but not verry safe. Why don't use Lenght(Lines[i])? But
anyway, how would you permit, that the user can type more the wanted
charakters to a line if not handling the wordbreak your self (if you don't
want to block the key input), just in case there is selected a font size
that enables more than wanted chars to a line before the standart wordbreak
proc breaks down the line because the clientarea is large engough to hold
eg. 50 chars?

To block a key input is possible, as you said, but I think it's not verry
nice. The control generally supports wordbreaking so it should work in that
descendant control too - don't it? I would only block the key input, if the
total count of chars has exceeded.

Regards,
Alexander Bauer

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