The QGraphicsSceneDragDropEvent class provides events for drag and drop in the graphics view framework. 更多...
继承 QGraphicsSceneEvent .
The QGraphicsSceneDragDropEvent class provides events for drag and drop in the graphics view framework.
QGraphicsView inherits the drag and drop functionality provided by QWidget . When it receives a drag and drop event, it translates it to a QGraphicsSceneDragDropEvent.
QGraphicsSceneDragDropEvent stores events of type GraphicsSceneDragEnter , GraphicsSceneDragLeave , GraphicsSceneDragMove ，或 GraphicsSceneDrop .
QGraphicsSceneDragDropEvent contains the position of the mouse cursor in both item, scene, and screen coordinates; this can be retrieved with pos (), scenePos ()，和 screenPos ().
The scene sends the event to the first QGraphicsItem under the mouse cursor that accepts drops; a graphics item is set to accept drops with setAcceptDrops() .
Sets the proposed action as accepted, i.e, the drop action is set to the proposed action. This is equal to:
setDropAction(proposedAction());
When using this function, one should not call accept() .
另请参阅 dropAction (), setDropAction (), and proposedAction ().
返回 Qt.MouseButtons value indicating which buttons were pressed on the mouse when this mouse event was generated.
另请参阅 Qt.MouseButtons .
Returns the action that was performed in this drag and drop. This should be set by the receiver of the drop and is returned by QDrag.exec ().
另请参阅 setDropAction () and acceptProposedAction ().
This function returns the MIME data of the event.
Returns the keyboard modifiers that were pressed when the drag and drop event was created.
另请参阅 Qt.KeyboardModifiers .
Returns the mouse position of the event relative to the view that sent the event.
另请参阅 QGraphicsView , screenPos ()，和 scenePos ().
Returns the possible drop actions that the drag and drop can result in.
另请参阅 Qt.DropActions .
Returns the drop action that is proposed, i.e., preferred. The action must be one of the possible actions as defined by possibleActions() .
另请参阅 Qt.DropAction and possibleActions ().
Returns the position of the mouse in scene coordinates.
Returns the position of the mouse relative to the screen.
This function lets the receiver of the drop set the drop action that was performed to action , which should be one of the possible actions 。调用 accept() in stead of acceptProposedAction() if you use this function.
另请参阅 dropAction (), accept ()，和 possibleActions ().
This function returns the QGraphicsView that created the QGraphicsSceneDragDropEvent .
