unit unitFrmMain;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs;

type
  TForm1 = class(TForm)
  private
    { Private declarations }
    procedure WMMOVE(var Msg: TMessage); message WM_MOVE;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

{ TForm1 }

procedure TForm1.WMMOVE(var Msg: TMessage);
begin
  begin
    inherited;
    if (Left < 10) and (Top < 10) and
      (Left <> 0) and (Top <> 0) then // 設定移動到左上角 10 點范圍內時貼到邊上去
      begin
        Left := 0;
        Top := 0;
        Msg.Result := 0;
      end;
  end;

end;

end.