Resizable DataGrid Question

[Mike Doub]

I believe that I have found a way to get the previous grid item, but I must
have the syntax incorrect for getting the dgIndex of me.   Nothing is being
returned.  Can any DataGrid experts give me any guidance?

Thanks   
   Mike


on FillInData pDataArray
   set the text of field "Name" of me to pDataArray["LastName"] & \
         comma & space & pDataArray["FirstName"] & space &
pDataArray["MiddleName"]
   put char 1 of fld "Name" of me into field "spacerLable" of me
   put the dgControl of me into theGrid
   put the dgIndex of me into tIndex
-- get the index of the current grid item
   put the dgIndexes of me into tList
-- get list of grid indexes in display order

   put itemoffset(tIndex,tList) into toff
--find the current index in the ordered list
   put item (toff -1) of tList into tpreIndex
-- get the index of the previous grid item
   if tpreIndex = 0 then

      set the visiable of group "spacer" of me to true
-- we are the first grid item, so show the spacer
   else
      put the dgDataOfIndex[tpreIndex] of me into preData         -- get the
data for the previous grid item
      if char 1 of preData["LastName"] = field "spacerLable" of me then
         set the visiable of group "spacer" of me to false
-- no difference yet
      else
         set the visiable of group "spacer" of me to true
-- we found a difference
      end if
   end if
end FillInData


-----Original Message-----
From: use-livecode-bounces at lists.runrev.com
[mailto:use-livecode-bounces at lists.runrev.com] On Behalf Of Pete
Sent: Tuesday, October 18, 2011 3:29 PM
To: How to use LiveCode
Subject: Re: Resizable DataGrid Question

The selectionchanged message sent to the datagrid includes the index of the
current and previous selected datagrid rows as parameters.  I'm not sure if
that will help though, since this happens outside of the custom behavior
where the LayoutControl handler sits.

Another way might be to store the index/line number of the row in a custom
property of the datagrid and get it back when you need it (and before
overwriting it with the current index/line of course!)

Have you considered doing this in the source data by inserting an extra row
with some sort of indication that it represents a sort break?

Pete
Molly's Revenge <http://www.mollysrevenge.com>




On Tue, Oct 18, 2011 at 10:46 AM, Mike Doub <Mike at doub.com> wrote:

> I am trying to use a DataGrid to create a contact list that has a spacer
> between each alphabetic grouping of names.   I was thinking to use the
> non-fixed length attribute of the DataGrid and adjust the size 
> dynamically in the LayoutControl handler as well as showing a field that
would contain
> the spacer.   I am unclear how to determine the contents of the previous
> grid element from within the current handler to know when expand the grid
> for the spacer.   I also need to understand how to figure out if this is
> the
> first grid element.
>
>
>
> Does anyone have any examples of how this might be accomplished?
>
>
>
> Thanks
>
>    Mike
>
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