Diagrama de herencias de QwtGuardedPainter

Métodos públicos
void	begin (QwtPlotCanvas *canvas)
void	end ()
virtual bool	eventFilter (QObject , QEvent event)
Atributos públicos
QPainter	painter

Documentación de las funciones miembro

void QwtGuardedPainter::begin ( QwtPlotCanvas * canvas ) [inline]

void QwtGuardedPainter::end ( ) [inline]

virtual bool QwtGuardedPainter::eventFilter	(	QObject *	,
		QEvent *
	)		`[inline, virtual]`

Filters events if this object has been installed as an event filter for the watched object.

In your reimplementation of this function, if you want to filter the event e, out, i.e. stop it being handled further, return TRUE; otherwise return FALSE.

Example:

    class MyMainWindow : public QMainWindow
    {
    public:
        MyMainWindow( QWidget *parent = 0, const char *name = 0 );

    protected:
        bool eventFilter( QObject *obj, QEvent *ev );

    private:
        QTextEdit *textEdit;
    };

    MyMainWindow::MyMainWindow( QWidget *parent, const char *name )
        : QMainWindow( parent, name )
    {
        textEdit = new QTextEdit( this );
        setCentralWidget( textEdit );
        textEdit->installEventFilter( this );
    }

    bool MyMainWindow::eventFilter( QObject *obj, QEvent *ev )
    {
        if ( obj == textEdit ) {
            if ( e->type() == QEvent::KeyPress ) {
                QKeyEvent *k = (QKeyEvent*)ev;
                qDebug( "Ate key press %d", k->key() );
                return TRUE;
            } else {
                return FALSE;
            }
        } else {
            // pass the event on to the parent class
            return QMainWindow::eventFilter( obj, ev );
        }
    }

Notice in the example above that unhandled events are passed to the base class's eventFilter() function, since the base class might have reimplemented eventFilter() for its own internal purposes.

Atención:: If you delete the receiver object in this function, be sure to return TRUE. Otherwise, Qt will forward the event to the deleted object and the program might crash.

Ver también:: installEventFilter()

Reimplementado de QObject.

Documentación de los datos miembro

QPainter QwtGuardedPainter::painter

La documentación para esta clase fue generada a partir del siguiente fichero:

src/qwt/src/qwt_plot_curve.cpp

Métodos públicos

Atributos públicos

Documentación de las funciones miembro

Documentación de los datos miembro