delphi 实现 托动PageControl上的标签页

procedure TMainForm.PageControl1MouseDown(Sender: TObject;
   Button: TMouseButton; Shift: TShiftState; X, Y: Integer) ;
begin
   PageControl1.BeginDrag(False) ;
end;

procedure TMainForm.PageControl1DragDrop(Sender, Source: TObject; X,
   Y: Integer) ;
const
   TCM_GETITEMRECT = $130A;
var
   TabRect: TRect;
   j: Integer;
begin
   if (Sender is TPageControl) then
   for j := 0 to PageControl1.PageCount - 1 do
   begin
     PageControl1.Perform(TCM_GETITEMRECT, j, LParam(@TabRect)) ;
     if PtInRect(TabRect, Point(X, Y)) then
     begin
       if PageControl1.ActivePage.PageIndex <> j then
         PageControl1.ActivePage.PageIndex := j;
       Exit;
     end;
   end;
end;

procedure TMainForm.PageControl1DragOver(Sender, Source: TObject; X,
   Y: Integer; State: TDragState; var Accept: Boolean) ;
begin
   if (Sender is TPageControl) then Accept := True;
end;