<sigh> never mind. I just realized that if the datagrid gets re-sorted, there IS NO WAY to determine the next visible line in a datagrid. Kinda sucks.
Bob S > On Jul 31, 2024, at 11:01 AM, Bob Sneidar via use-livecode > <use-livecode@lists.runrev.com> wrote: > > Hi all. > > Has anyone tried to determine the index of the next line of a datagrid? It’s > not as straightforward as you might think. When data is first loaded into a > datagrid, the dgIndexes are only going to be in numeric order if the sort > order of the datagrid is the same as the data you are loading. Otherwise, the > indexes will be all mixed up, but the dgLines of the datagrid will ALWAYS be > in the order of the visible rows. > > Sure you can just add one to the current dgHilitedLine, but what if you want > to know the index of the next line just before deleting the current one? You > cannot delete the line first because then the line numbers change, and there > won’t be another line hilited until your code sets it. > > And while there is a dgIndexOfLine property built in, there is no > dgLineOfIndex! Not only that, but there is a dgIndexes property, but there is > no dgLines property! How odd is that?? The goal is to determine the index of > the next visible line where the line numbers are no longer sequential. > > So I wrote some very simple virtual properties that ought to be a part of the > datagrid library. You can put these in the script of a datagrid itself, or if > you are brave enough to use the inline behaviors feature of datagrids as I > do, you can put them in your own datagrid custom library. But really they > belong in the built-in datagrid library itself. They are: > > getProp dgNextIndexOfLine [tLine] > put tLine +1 into tNewLine > > if tNewLine > the dgNumberOfLines of me then > put the dgIndexOfLine [tLine] of me into tIndex > else > put the dgIndexOfLine [tNewLine] of me into tIndex > end if > > return tIndex > end dgNextIndexOfLine > > getProp dgPrevIndexOfLine [tLine] > put tLine -1 into tNewLine > > if tNewLine <1 then > put the dgIndexOfLine [tLine] of me into tIndex > else > put the dgIndexOfLine [tNewLine] of me into tIndex > end if > > return tIndex > end dgPrevIndexOfLine > > You are welcome. :-) > > Bob S > > _______________________________________________ > 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 _______________________________________________ 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
