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com.trolltech.qt.gui
Class QGraphicsSceneEvent

java.lang.Object
  extended by com.trolltech.qt.QSignalEmitter
      extended by com.trolltech.qt.QtJambiObject
          extended by com.trolltech.qt.core.QEvent
              extended by com.trolltech.qt.gui.QGraphicsSceneEvent
All Implemented Interfaces:
QtJambiInterface
Direct Known Subclasses:
QGraphicsSceneContextMenuEvent, QGraphicsSceneDragDropEvent, QGraphicsSceneHelpEvent, QGraphicsSceneHoverEvent, QGraphicsSceneMouseEvent, QGraphicsSceneWheelEvent

public class QGraphicsSceneEvent
extends QEvent

The QGraphicsSceneEvent class provides a base class for all graphics view related events.

When a QGraphicsView receives Qt mouse, keyboard, and drag and drop events (QMouseEvent, QKeyEvent, QDragEvent, etc.), it translates them into instances of QGraphicsSceneEvent subclasses and forwards them to the QGraphicsScene it displays. The scene then forwards the events to the relevant items.

For example, when a QGraphicsView receives a QMouseEvent of type MousePress as a response to a user click, the view sends a QGraphicsSceneMouseEvent of type GraphicsSceneMousePress to the underlying QGraphicsScene through its mousePressEvent() function. The default QGraphicsScene::mousePressEvent() implementation determines which item was clicked and forwards the event to QGraphicsItem::mousePressEvent().

Subclasses such as QGraphicsSceneMouseEvent and QGraphicsSceneContextMenuEvent provide the coordinates from the original QEvent in screen, scene, and item coordinates (see screenPos(), scenePos(), and pos()). The item coordinates are set by the QGraphicsScene before it forwards the event to the event to a QGraphicsItem. The mouse events also add the possibility to retrieve the coordinates from the last event received by the view (see lastScreenPos(), lastScenePos(), and lastPos()).

See Also:
QEvent

Nested Class Summary
 
Nested classes/interfaces inherited from class com.trolltech.qt.core.QEvent
QEvent.Type
 
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter
QSignalEmitter.AbstractSignal, QSignalEmitter.Signal0, QSignalEmitter.Signal1<A>, QSignalEmitter.Signal2<A,B>, QSignalEmitter.Signal3<A,B,C>, QSignalEmitter.Signal4<A,B,C,D>, QSignalEmitter.Signal5<A,B,C,D,E>, QSignalEmitter.Signal6<A,B,C,D,E,F>, QSignalEmitter.Signal7<A,B,C,D,E,F,G>, QSignalEmitter.Signal8<A,B,C,D,E,F,G,H>, QSignalEmitter.Signal9<A,B,C,D,E,F,G,H,I>
 
Constructor Summary
QGraphicsSceneEvent(QEvent.Type type)
          
 
Method Summary
static QGraphicsSceneEvent fromNativePointer(QNativePointer nativePointer)
          This function returns the QGraphicsSceneEvent instance pointed to by nativePointer
 QWidget widget()
          Returns the widget where the event originated, or 0 if the event originates from another application.
 
Methods inherited from class com.trolltech.qt.core.QEvent
accept, ignore, isAccepted, setAccepted, setT, spontaneous, t, type
 
Methods inherited from class com.trolltech.qt.QtJambiObject
dispose, disposed, finalize, reassignNativeResources, tr, tr, tr
 
Methods inherited from class com.trolltech.qt.QSignalEmitter
blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread
 
Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface com.trolltech.qt.QtJambiInterface
disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership
 

Constructor Detail

QGraphicsSceneEvent

public QGraphicsSceneEvent(QEvent.Type type)

Method Detail

widget

public final QWidget widget()

Returns the widget where the event originated, or 0 if the event originates from another application.


fromNativePointer

public static QGraphicsSceneEvent fromNativePointer(QNativePointer nativePointer)
This function returns the QGraphicsSceneEvent instance pointed to by nativePointer

Parameters:
nativePointer - the QNativePointer of which object should be returned.

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