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TList.Sort

Posted on 1999-01-18
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Last Modified: 2010-04-06
Can someone explain how exactly the sort method of a TList is to be used?
Thanks.
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Question by:franksymons
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2 Comments
 
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philipleighs earned 50 total points
ID: 1362367
Hi,

Declare a function called MySortProc like this:

function MySortProc(Item1, Item2: Pointer): Integer;
  begin
    Result := 0;
    //Compare Item1 with Item2. Return -1, 0 or 1 for less, equal or greater
    //If the tlist object stores TYourClass objects, and you
    //want to sort by the Name property, then do this:
    if TYourClass(Item1).Name > TYourClass(Item2).Name then
      Result := 1
    else
    if TYourClass(Item1).Name < TYourClass(Item2).Name then
      Result := -1;
  end;


//Call this procedure to sort your list
procedure SortListOfYourClass(AList: TList);
  begin
    AList.Sort(MySortProc);
  end;


Cheers,
Phil.

PS: If you need more help, then describe what the list stores, and how you want to order the list items, and I'll give you some code to do it.
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Author Comment

by:franksymons
ID: 1362368
Thanks, but do you have any idea why the sortprocedure can't be a method of a form or an object but has to be an ordinary procedure?
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