本文整理自网络，侵删。
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;
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