Hello,

when I execute ListView.AlphaSort then ListView always sorts first column with default sort order. Also it resets SortColumn property to zero and SortOrder to default (see attached screenshot: before and after execution of Alphasort).

Why it not sorts current SortColumn with current SortOrder? Is this a Bug?

Tried in Qt, Gtk2 and Win widgetsets - same strange result.

No, it isn't a bug.
?
In sources, you can see comment:
?
function AlphaSort: Boolean; // always sorts column 0 in sdAscending order ?
So if you want other sorting, you must set three sort-related properties: ?
ListView1.SortColumn:=1;
ListView1.SortDirection:=sdAscending;
ListView1.SortType:=stText;
?
It works, I just tested in Qt.
?
V.

2015.04.14 15:34, Vojt?ch ?ih?k ra??:

Looked not in *primary* source (Google, Documentation) :)

Why I came to AlphaSort: in my source ListView is cleared (columns stays same) and populated with new info. After that current column (say SortColumn=1) is no sorted (Autosort is TRUE; tried in Qt, Gtk2 and Win) so I must somehow to trigger sorting. But how?

Indeed, the documentation is a bit sparse. ;-)

http://lazarus-ccr.sourceforge.net/docs/lcl/comctrls/tcustomlistview.alphasort.html

ps:
How often is the online documentation regenerated and updated on the website?

Regards,
- Graeme -

I understand. Method Sort; is protected (as it is in Delphi). ?
You have probably no other choice than do
?
?ListView1.SortDirection:=sdDescending;
?ListView1.SortDirection:=sdAscending;
?
which works but it is unefficient, sorting is done twice. ?
I tried:
?ListView1.BeginUpdate;
?ListView1.SortDirection:=sdDescending;
?ListView1.EndUpdate;
?ListView1.SortDirection:=sdAscending;but it doesn't help, sorting is still done twice (at least on Qt).ListView has some flags to avoid sorting but those flags are private.V.? ?

Delphi has no properties AutoSort, SortColumn and SortDirection nor methods BeginUpdate and EndUpdate. ?
I would provide a patch which will set Flag?lffPreparingSorting on BeginUpdate and reset it on EndUpdate. +one additional call of Sort on EndUpdate (maybe only if AutoSort is True) OR move Sort; form protected to public. ?
What is preferred?
?
V.

2015.04.14 16:22, Vojt?ch ?ih?k ra??:

Thanks for mentioning protected Sort procedure. So I come to "dirty" solution:

- create helper class:

type
   THack = class(TListView)
   public
      procedure Trigger_sort;
   end;
  - implement "Trigger_sort":
procedure THack.Trigger_sort;
begin
     Sort;
end;
  - now when to trigger sort with current settings is needed then execute:
THack(ListView1).Trigger_sort;
  Works for me (at least in Qt (Linux) and Win (Windows7)).

2015.04.14 17:49, Vojt?ch ?ih?k ra??:

Solution to move "Sort" to "public" is more convenient for me if it not will break something (or will break?).