🚀 go-pugleaf

In article <1993Jan8.213117.12635@b8.b8.ingr.com>, paries@b8.b8.ingr.com (Randy Paries) writes:
> 	My problem is that I can't seem to stop/force the user
> 	to 60 chars lines.
> 
> 	My Goal is at 60 chars to either ring a bell so that they 
> 	have to hit <CR> or even better have it wrap.
> 
> 	At present with the resources above I can make the TextWidget
> 	apprear with 60 columns and not change widths, but they can 
> 	continue to Type for ever.

Okay, right first thing, do what you want with your resources, it'll make not
a lot of difference, really.

You need to add an XmNmodifyVerifyCallback to your text widget.

static XtCallbackProc callback_func(Widget                     w,
                                    XtPointer                  client_data,
                                    XmTextVerifyCallbackStruct str)
This callback
can then check the length of the existing text and incoming text and decide
wether it should break the incoming text up, or disallow the incoming text.
A delete is detected by looking for inserted text of length zero, the 
str->text->ptr and str->text->length fields of the callback structure will be
NULL and zero. You can in general ignore the str->text->format field.

For instance you can set the str->doit field to FALSE if the text is too long
(remember that deleting from one line across a \n may cause a line to be too
long). If you set the XmNverifyBell resource to TRUE, the bell will
automatically sound if the user tries to do something which results in you
setting str->doit to false.

See the XmText man page.

This works, I've done similar stuff this way. You could also implement enough
stuff to remember how to do an undo/redo function, although I haven't had the
need to do this yet.

You can also use XmNvalueChangedCallback, except this gets called after the
event. I wouldn't recommend this.
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