On Thu, Oct 20, 2011 at 12:34 AM, Mike Doub <m...@doub.com> wrote: > I am not sure that you can assume that the indexes always going to > correspond to the display order. This is why I decided to use dgIndex > function as it returns the indexes in the display order. I do plan on > having multiple sorting options.
Indeed, we can't assume that the dgIndex and the dgLine will return the same value after sorting the list. And that was exactly the reason I chosen to use dgLine instead of dgData after testing. Why? Let's explore a small array of three names and their respective indexes: [firstname][1] = "Mike" [firstname][2] = "zryip" [firstname][3] = "Dave" Indexes for the firstname column are : 1,2,3 Now apply an ascending sort to our column firstname. The result is: [firstname][3] = "Dave" [firstname][1] = "Mike" [firstname][2] = "Zryip" Indexes for the firstname column are now : 3,1,2 Now we can explore your code: put the dgIndexes of me into tList -- Here tList for our sorting column will contain indexes in their current order: 3,1,2 -- Considering we are currently filling data for the second row, the dgIndex for row 2 is 1 put itemoffset(tIndex,tList) into toff -- itemoffset(1,"3,1,2") -- will return 2, which is actually the number of our second row. put item (toff -1) of tList into tpreIndex --find the current index in the ordered list -- The previous index of index (2 - 1) in the dgIndexes is 3. By using this code: put the dgIndexes of me into tList put itemoffset(tIndex,tList) into toff put item (toff -1) of tList into tpreIndex You are in fact searching the location of the previous dgIndex in the rows order, so you are doing something equivalent to: put (the dgLine of me - 1) into tThePreviousLine In conclusion using your code or using dgLine - 1 to get the previous value linked to the array index, have an equivalent result. Best regards, -- -Zryip TheSlug- wish you the best! 8) http://www.aslugontheroad.co.cc _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode