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       QCustomEvent - Support for custom events


       #include <qevent.h>

       Inherits QEvent.

   Public Members
       QCustomEvent ( int type )
       QCustomEvent ( Type type, void * data )
       void * data () const
       void setData ( void * data )


       The QCustomEvent class provides support for custom events.

       QCustomEvent is a generic event class for user-defined events. User defined events can be
       sent to widgets or other QObject instances using QApplication::postEvent() or
       QApplication::sendEvent(). Subclasses of QObject can easily receive custom events by
       implementing the QObject::customEvent() event handler function.

       QCustomEvent objects should be created with a type ID that uniquely identifies the event
       type. To avoid clashes with the Qt-defined events types, the value should be at least as
       large as the value of the "User" entry in the QEvent::Type enum.

       QCustomEvent contains a generic void* data member that may be used for transferring event-
       specific data to the receiver. Note that since events are normally delivered
       asynchronously, the data pointer, if used, must remain valid until the event has been
       received and processed.

       QCustomEvent can be used as-is for simple user-defined event types, but normally you will
       want to make a subclass of it for your event types. In a subclass, you can add data
       members that are suitable for your event type.


           class ColorChangeEvent : public QCustomEvent
               ColorChangeEvent( QColor color )
                   : QCustomEvent( 65432 ), c( color ) {}
               QColor color() const { return c; }
               QColor c;
           // To send an event of this custom event type:
           ColorChangeEvent* ce = new ColorChangeEvent( blue );
           QApplication::postEvent( receiver, ce );  // Qt will delete it when done
           // To receive an event of this custom event type:
           void MyWidget::customEvent( QCustomEvent * e )
               if ( e->type() == 65432 ) {  // It must be a ColorChangeEvent
                   ColorChangeEvent* ce = (ColorChangeEvent*)e;
                   newColor = ce->color();

       See also QWidget::customEvent(), QApplication::notify(), and Event Classes.


QCustomEvent::QCustomEvent ( int type )

       Constructs a custom event object with event type type. The value of type must be at least
       as large as QEvent::User. The data pointer is set to 0.

QCustomEvent::QCustomEvent ( Type type, void * data )

       Constructs a custom event object with the event type type and a pointer to data. (Note
       that any int value may safely be cast to QEvent::Type).

void * QCustomEvent::data () const

       Returns a pointer to the generic event data.

       See also setData().

void QCustomEvent::setData ( void * data )

       Sets the generic data pointer to data.

       See also data().



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