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...prevent, that the user can resize the columns of a TListView?
Autor: Fred Schwarzer
[ Print tip ]  

Tip Rating (4):  
     


private
  
FListViewOldWndProc: TWndMethod;
  procedure ListViewNewWndProc(var Msg: TMessage);
end;

{....}

implementation

uses
  
CommCtrl;


procedure TForm1.FormCreate(Sender: TObject);
begin
  
//Sichern der ursprünglichen WindowProc der Listview
  
FListViewOldWndProc := ListView1.WindowProc;

  //Subclassing: Umleiten der WindowProc auf unsere eigene Procedur
  
Listview1.WindowProc := ListViewNewWndProc;
end;

procedure TForm1.ListViewNewWndProc(var Msg: TMessage);
var
  
hdn: ^THDNotify;
begin
  if 
Msg.Msg = WM_NOTIFY then
  begin
    
hdn := Pointer(Msg.lParam);
    //Abfangen und löschen der HDN_BeginTrack Botschaft
    
if (hdn.hdr.code = HDN_BeginTrackW) or (hdn.hdr.code = HDN_BeginTrackA) then
      
Msg.Result := 1
    else
      
FListViewOldWndProc(Msg);
  end
  
// ansonsten Botschaft an die ursprüngliche WindowProc weiterreichen
  
else 
    
FListViewOldWndProc(Msg);
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  
//vor dem Beenden Original WindowProc wiederherstellen
  
ListView1.WindowProc := FlistViewOldWndProc;
  FListViewOldWndProc  := nil;
end;


 

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