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68 daniel-mar 1 
unit VTSListView;
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interface
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// This ListView adds support for sorting arrows
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// Recommended usage for the OnCompare event:
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(*
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procedure TForm1.ListViewCompare(Sender: TObject; Item1,
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  Item2: TListItem; Data: Integer; var Compare: Integer);
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var
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  ListView: TVTSListView;
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begin
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  ListView := Sender as TVTSListView;
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  if ListView.CurSortedColumn = 0 then
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  begin
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    Compare := CompareText(Item1.Caption, Item2.Caption);
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  end
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  else
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  begin
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    Compare := CompareText(Item1.SubItems[ListView.CurSortedColumn-1],
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                           Item2.SubItems[ListView.CurSortedColumn-1]);
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  end;
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  if ListView.CurSortedDesc then Compare := -Compare;
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end;
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*)
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uses
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  Windows, Messages, SysUtils, Classes, Controls, ComCtrls, CommCtrl;
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type
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  TVTSListView = class(TListView)
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  private
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    FDescending: Boolean;
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    FSortedColumn: Integer;
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    procedure WMNotifyMessage(var msg: TWMNotify); message WM_NOTIFY;
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  protected
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    procedure ShowArrowOfListViewColumn;
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    procedure ColClick(Column: TListColumn); override;
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  public
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    constructor Create(AOwner: TComponent); override;
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  published
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    property CurSortedColumn: integer read FSortedColumn;
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    property CurSortedDesc: boolean read FDescending;
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  end;
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procedure Register;
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implementation
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// The arrows require a XP Manifest
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{$IF not Declared(HDF_SORTUP)}
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const
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  { For Windows >= XP }
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  {$EXTERNALSYM HDF_SORTUP}
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  HDF_SORTUP              = $0400;
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  {$EXTERNALSYM HDF_SORTDOWN}
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  HDF_SORTDOWN            = $0200;
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{$IFEND}
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{ TVTSListView }
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constructor TVTSListView.Create(AOwner: TComponent);
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begin
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  inherited;
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  FSortedColumn := -1;
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end;
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procedure TVTSListView.ShowArrowOfListViewColumn;
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var
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  Header: HWND;
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  Item: THDItem;
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  i: integer;
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begin
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  Header := ListView_GetHeader(Handle);
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  ZeroMemory(@Item, SizeOf(Item));
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  Item.Mask := HDI_FORMAT;
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  // Remove arrows
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  for i := 0 to Columns.Count-1 do
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  begin
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    Header_GetItem(Header, i, Item);
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    Item.fmt := Item.fmt and not (HDF_SORTUP or HDF_SORTDOWN);
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    Header_SetItem(Header, i, Item);
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  end;
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  // Add arrow
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  Header_GetItem(Header, FSortedColumn, Item);
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  if FDescending then
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    Item.fmt := Item.fmt or HDF_SORTDOWN
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  else
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    Item.fmt := Item.fmt or HDF_SORTUP;
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  Header_SetItem(Header, FSortedColumn, Item);
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end;
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procedure TVTSListView.WMNotifyMessage(var msg: TWMNotify);
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begin
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  inherited;
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  if (Msg.NMHdr^.code = HDN_ENDTRACK) and (FSortedColumn > -1) then
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  begin
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    ShowArrowOfListViewColumn;
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  end;
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end;
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procedure TVTSListView.ColClick(Column: TListColumn);
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begin
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  if not Assigned(OnCompare) then Exit;
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  SortType := stNone;
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  if Column.Index <> FSortedColumn then
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  begin
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    FSortedColumn := Column.Index;
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    FDescending := False;
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  end
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  else
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  begin
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    FDescending := not FDescending;
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  end;
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  ShowArrowOfListViewColumn;
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  SortType := stText;
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  inherited;
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end;
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procedure Register;
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begin
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  RegisterComponents('ViaThinkSoft', [TVTSListView]);
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end;
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end.