Отслеживать переход мышки на компонент и уход ее

Code:

unit ImageEx;

interface

uses

  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,

  Dialogs, ExtCtrls;

type

  TImageEx = class (TImage)

  private

    { Private declarations }

    FOnMouseLeave: TNotifyEvent;

    FOnMouseEnter: TNotifyEvent;

    procedure CMMouseEnter(var msg: TMessage);

      message CM_MOUSEENTER;

    procedure CMMouseLeave(var msg: TMessage);

      message CM_MOUSELEAVE;

  protected

    { Protected declarations }

    procedure DoMouseEnter; dynamic;

    procedure DoMouseLeave; dynamic;

  public

    { Public declarations }

  published

    { Published declarations }

    property OnMouseEnter: TNotifyEvent read FOnMouseEnter write FOnMouseEnter;

    property OnMouseLeave: TNotifyEvent read FOnMouseLeave write FOnMouseLeave;

  end;

procedure Register;

implementation

procedure Register;

begin

  RegisterComponents('Additional', [TImageEx]);

end;

{ TImageEx }

procedure TImageEx.CMMouseEnter(var msg: TMessage);

begin

  DoMouseEnter;

end;

procedure TImageEx.CMMouseLeave(var msg: TMessage);

begin

  DoMouseLeave;

end;

procedure TImageEx.DoMouseEnter;

begin

  if Assigned(FOnMouseEnter) then FOnMouseEnter(Self);

end;

procedure TImageEx.DoMouseLeave;

begin

  if Assigned(FOnMouseLeave) then FOnMouseLeave(Self);

end;

end.