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unit Unit1;

interface

uses
  SysUtils, Types, Classes, QGraphics, QControls, QForms, QDialogs,
  QStdCtrls, QT;

type

  TEdit = class( QStdCtrls.TEdit )

  protected
    function EventFilter(Sender: QObjectH; Event: QEventH): Boolean; override;
  end;

  TForm1 = class(TForm)
    Edit1: TEdit;
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.xfm}

{ TEdit }

function TEdit.EventFilter(Sender: QObjectH; Event: QEventH): Boolean;
begin
  Result := true;
  case QEvent_Type( Event ) of
    QEventType_Leave: Color := clRed;
    QEventType_Enter: Color := clBlue;
  else
    Result := inherited EventFilter( Sender, Event );
  end;
end;