Mega Code Archive
How to prevent that the user can resize the columns of a TListView
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Title: How to prevent that the user can resize the columns of a TListView
private
FListViewOldWndProc: TWndMethod;
procedure ListViewNewWndProc(var Msg: TMessage);
end;
{....}
implementation
uses
CommCtrl;
procedure TForm1.FormCreate(Sender: TObject);
begin
//Sichern der urspr¨¹nglichen 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 l?schen 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 urspr¨¹ngliche 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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