const WM_MouseEnter = $B013; WM_MouseLeave = $B014;type TfrmMain = class(TForm)  .  . Timer1: TTimer; procedure Timer1Timer(Sender: TObject); protected procedure WMMouseEnter(var Msg: TMessage); message WM_MouseEnter; end;implementation{$R *.dfm}procedure TfrmMain.WMMouseEnter(var Msg: TMessage);begin if(Top<0) then begin Top := 0; //為保證下拉窗體后呈現在最前面 SetWindowPos(Handle,HWND_TOPMOST,0,0,0,0,SWP_NOMOVE or SWP_NOSIZE); //將窗體推到最前 SetWindowPos(Handle,HWND_NOTOPMOST,0,0,0,0,SWP_NOMOVE or SWP_NOSIZE); //然后取消窗體最前 end; Timer1.Enabled := True;end;//依賴定時器定時檢查鼠標是否還在窗體范圍內，//這樣此能避免因為快速移動鼠標而丟失MOUSELEAVE事件procedure TfrmMain.Timer1Timer(Sender: TObject);var rc:TRECT; pt:TPOINT;begin GetWindowRect(self.Handle,rc); //取窗體的矩形區域 GetCursorPos(pt); //取得當前鼠標所在位置 if(not PtInRect(rc,pt)) then //如果鼠標不在窗體范圍內 begin  if(Top = 0) then  //如果目前窗體正吸附在屏幕上沿，則上移隱藏窗體  begin   Top := 0-Height+2;  end;  Timer1.Enabled := False; //窗體隱藏后定時器關閉  SetWindowPos(Handle,HWND_TOPMOST,0,0,0,0,SWP_NOMOVE or SWP_NOSIZE);  //將窗體推到最前 end;end;