Referencia de la Clase QRollEffect

Diagrama de herencias de QRollEffect

Lista de todos los miembros.

Métodos públicos
	QRollEffect (QWidget *w, WFlags f, DirFlags orient)
void	run (int time)
Métodos protegidos
void	paintEvent (QPaintEvent *)
bool	eventFilter (QObject *, QEvent *)
void	closeEvent (QCloseEvent *)

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Documentación del constructor y destructor

QRollEffect::QRollEffect	(	QWidget *	w,
		WFlags	f,
		DirFlags	orient
	)

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Documentación de las funciones miembro

void QRollEffect::closeEvent

(

QCloseEvent *

e

)

[protected, virtual]

This event handler, for event e, can be reimplemented in a subclass to receive widget close events.

The default implementation calls e->accept(), which hides this widget. See the QCloseEvent documentation for more details.

Ver también:

event(), hide(), close(), QCloseEvent

Reimplementado de QWidget.

bool QRollEffect::eventFilter	(	QObject *	,
		QEvent *
	)		[protected, 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.

void QRollEffect::paintEvent

(

QPaintEvent *

)

[protected, virtual]

This event handler can be reimplemented in a subclass to receive paint events.

A paint event is a request to repaint all or part of the widget. It can happen as a result of repaint() or update(), or because the widget was obscured and has now been uncovered, or for many other reasons.

Many widgets can simply repaint their entire surface when asked to, but some slow widgets need to optimize by painting only the requested region: QPaintEvent::region(). This speed optimization does not change the result, as painting is clipped to that region during event processing. QListView and QCanvas do this, for example.

Qt also tries to speed up painting by merging multiple paint events into one. When update() is called several times or the window system sends several paint events, Qt merges these events into one event with a larger region (see QRegion::unite()). repaint() does not permit this optimization, so we suggest using update() when possible.

When the paint event occurs, the update region has normally been erased, so that you're painting on the widget's background. There are a couple of exceptions and QPaintEvent::erased() tells you whether the widget has been erased or not.

The background can be set using setBackgroundMode(), setPaletteBackgroundColor() or setBackgroundPixmap(). The documentation for setBackgroundMode() elaborates on the background; we recommend reading it.

Ver también:

event(), repaint(), update(), QPainter, QPixmap, QPaintEvent

Reimplementado de QWidget.

void QRollEffect::run

(

int

time

)

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

• src/qt/src/widgets/qeffects.cpp