Is it possible to limit text input in a field based upon its height?

[Scott Morrow]

Hello.

I once used something similar to what Bob suggested. (Though I should  
look at Bob's "line" solution to see if it won't work better.)  The  
following doesn't work perfectly in all cases... but perhaps it will  
provide an idea.

-- this goes in the field      
on rawKeyUp
   FieldLimiter -- don't allow typing past the visible bottom of the  
field
   pass rawKeyUp
end rawKeyUp


-- this goes somewhere in the message path of the field(s)
on FieldLimiter -- don't allow typing past the bottom of fixed-sized  
fields
   if (the textheightsum of the target) > (the height of the target +  
12)  then -- 12 is a "slop" factor
     if (word 4 of the selectedChunk) < (the num of chars of the  
target) then
       -- they are in the middle of the text somewhere so don't  
delete characters off the end
      -- play the uAlertSound of stack "Hidden"
       exit FieldLimiter
     end if
     -- they are typing at the end of the text chunk... don't let  
them insert characters
     delete last char of the target
    -- play the uAlertSound of stack "Hidden"
     repeat 5 times -- 5 is arbitrary
       if the textheightsum of the target < (the height of the target  
+ 12) then
         exit repeat
       end if
       delete last char of the target
     end repeat
     set the scroll of the target to 0
   end if
end FieldLimiter	



-Scott Morrow

Elementary Software
(Now with 20% less chalk dust !)
web     http://elementarysoftware.com/
email   scott at elementarysoftware.com

-----------------------------------------------------------------

On Jul 20, 2007, at 11:37 AM, Robert Presender wrote:

> Hi,
>
> If the field height is divided by the textHeight, the result is the  
> number of lines.
> You can then limit the number of lines.
> See textHeight and keyDown in the docs.  Don't know if the spacebar  
> can be used with keyDown.
>
> Regards ... Bob
>
>
> on Tue, 10 Jul 2007 15:55:00 -0700 (PDT) haribo  
> <ledersitze at netcologne.de> wrote:
>
> Sarah Reichelt-2 wrote:
>>
>> On 9/17/06, William de Smet <wdesmet at wanadoo.nl> wrote:
>>> Hi there,
>>>
>>> I made a field which is 500(width) x 530(height) pixels and now I am
>>> looking for a way to limit the text input in this field based  
>>> upon the
>>> height of the field.
>>> I dont want more text than the height of the field.
>>>
>>
>> If you set the autoTab of a field to true, when the user gets to the
>> last line and presses Return or Enter, it will be as if they pressed
>> Tab to go to the next field. They won't be able to enter more lines
>> than are visible.
>>
>> Cheers,
>> Sarah
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