Title: How to exchange items in TListView
procedure Swap(X, Y: Integer);
var
s: Integer;
begin
s := X;
X := Y;
Y := X
end;
Something similar we can do with TListItem too.
But just to save all strings (caption+sub items) somewhere is not enough because TListItem class have a lot of other information (image indexes, pointer as Data, etc)
So correct way is to use Assign method:
procedure ExchangeItems(lv: TListView; const i, j: Integer);
var
tempLI: TListItem;
begin
lv.Items.BeginUpdate;
try
tempLI := TListItem.Create(lv.Items);
tempLI.Assign(lv.Items.Item[i]);
lv.Items.Item[i].Assign(lv.Items.Item[j]);
lv.Items.Item[j].Assign(tempLI);
tempLI.Free;
finally
lv.Items.EndUpdate
end;
end;
So structure is a same as in our sample for Integer. All what we added are
BeginUpdate and EndUpdate (just allow to reduce a flickering)
So if you want to exchange items in any ListView, just call this procedure...