[Lazarus] Can't make working sorting inTListView

[Flávio Etrusco]

On Mon, Jul 29, 2013 at 10:20 AM, Geoffray Levasseur-Brandin
<jeff.levasseur at free.fr> wrote:
> Hello all !!
>
> I've got a problem with the following code :
>
> procedure TfMain.lvPackageListColumnClick(Sender: TObject; Column:
> TListColumn);
> begin
>   if Column.Index = FLastSortedColumn then
>     FAscending := not FAscending
>   else
>     FLastSortedColumn := Column.Index;
>   lvPackageList.SortColumn := Column.Index;
> end;
>
> procedure TfMain.lvPackageListCompare(Sender: TObject; Item1, Item2:
> TListItem;
>   Data: Integer; var Compare: Integer);
> begin
>   case Data of
>     0: Compare := AnsiCompareText(Item1.Caption, Item2.Caption); //pkgname
>     1: Compare := CompareVersion(Item1.SubItems[0], Item2.SubItems[0]);
> //installed version
>     2: Compare := CompareVersion(Item1.SubItems[1], Item2.SubItems[1]); //last
> version
>     3: Compare := CompareInstSize(Item1.Caption, Item2.Caption); //installed
> size
>     4: Compare := CompareDefSize(Item1.Caption, Item2.Caption); //pkgsize
>     5: Compare := AnsiCompareText(Item1.SubItems[4], Item2.SubItems[4]);
> //description
>   end;
>   if not FAscending then
>     Compare := -Compare;
> end;
>
> Whatever the column I'm clicking on it's always sorting the first column. I do
> really not understand what's wrong. All the functions I've made giving Compare
> its value returns correctly 1 if Itme1 > Item2, 0 if equal and -1 if Item1 <
> Item2.

I'm not really sure how TListView is supposed to work, however by
debugging the code I can see 'Data' is always 0. Maybe you're supposed
to just use ListView.SortColumn.

-Flávio

> Thanks for any help.
> --
> Geoffray « Fatalerrors » Levasseur-Brandin
>         <jeff.levasseur at free.fr>
>         <geoffray.levasseur-brandin at ac-toulouse.fr>
>         http://www.geoffray-levasseur.org/
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