com.trolltech.qt.gui
Class QGraphicsSceneEvent
java.lang.Object
com.trolltech.qt.internal.QSignalEmitterInternal
com.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.core.QEvent
com.trolltech.qt.gui.QGraphicsSceneEvent
- All Implemented Interfaces:
- QtJambiInterface
- Direct Known Subclasses:
- QGraphicsSceneContextMenuEvent, QGraphicsSceneDragDropEvent, QGraphicsSceneHelpEvent, QGraphicsSceneHoverEvent, QGraphicsSceneMouseEvent, QGraphicsSceneMoveEvent, QGraphicsSceneResizeEvent, 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 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, QSignalEmitter.Signal2, QSignalEmitter.Signal3, QSignalEmitter.Signal4, QSignalEmitter.Signal5, QSignalEmitter.Signal6, QSignalEmitter.Signal7, QSignalEmitter.Signal8, QSignalEmitter.Signal9 |
Nested classes/interfaces inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
com.trolltech.qt.internal.QSignalEmitterInternal.AbstractSignalInternal |
Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal |
currentSender |
Method Summary |
java.lang.String |
toString()
Returns a string representation of the this QGraphicsSceneEvent. |
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.internal.QSignalEmitterInternal |
__qt_signalInitialization |
Methods inherited from class java.lang.Object |
clone, getClass, hashCode, notify, notifyAll, wait, wait, wait |
widget
public final QWidget widget()
- Returns the widget where the event originated, or 0 if the event originates from another application.
toString
public java.lang.String toString()
- Returns a string representation of the this QGraphicsSceneEvent.
- Overrides:
toString
in class QEvent