Arrows Keys and List Fields

[Devin Asay]

Hi Gregory,

On Jan 11, 2008, at 10:15 AM, Gregory Lypny wrote:

> Hello everyone,
>
> I have a list field, and as I use the Up and Down keys, I want to  
> display the contents of individual lines in another field.  The  
> list field's handler below displays the lagged line and not the one  
> that was keyed to because the selected line doesn't change until  
> the pass arrowKey command is invoked and that has to happen at the  
> end for the line to change.
>
> Not sure how to get what I want.
>
> 	Gregory
>
> on arrowKey theKey
>   if theKey is "Up" or theKey is "Down"
>   then
>     put the value of the selectedLine of the target into fld "Display"
>     pass arrowKey
>   end if
> end arrowKey

The rawKeyUp message should do what you want. I've used it before to  
do what you are describing. Something like this:

    on rawKeyUp pWhich
      if pWhich is 65364 then # down arrow
         put the hilitedLine of field "list1" into currentLine
         if currentLine < the number of lines in fld "list1" then
           add 1 to currentLine
           set the hilitedLines of field "list1" to currentLine
         end if
         put the selectedText of fld "list1" into fld "showSelection"
       else if pWhich is 65362 then # up arrow
         put the hilitedLine of field "list1" into currentLine
         if currentLine > 1 then
           subtract 1 from currentLine
           set the hilitedLines of field "list1" to currentLine
         end if
         put the selectedText of fld "list1" into fld "showSelection"
       else
	pass rawKeyup
       end if
     end rawKeyUp

HTH

Devin

Devin Asay
Humanities Technology and Research Support Center
Brigham Young University