QGraphicsSceneDragDropEvent Class
The QGraphicsSceneDragDropEvent class provides events for drag and drop in the graphics view framework. 更多...
| 头文件: | #include <QGraphicsSceneDragDropEvent> |
| qmake: | QT += widgets |
| 开始支持版本: | Qt 4.2 |
| 基类: | QGraphicsSceneEvent |
公有函数
| ~QGraphicsSceneDragDropEvent() | |
| void | acceptProposedAction() |
| Qt::MouseButtons | buttons() const |
| Qt::DropAction | dropAction() const |
| const QMimeData * | mimeData() const |
| Qt::KeyboardModifiers | modifiers() const |
| QPointF | pos() const |
| Qt::DropActions | possibleActions() const |
| Qt::DropAction | proposedAction() const |
| QPointF | scenePos() const |
| QPoint | screenPos() const |
| void | setDropAction(Qt::DropAction action) |
| QWidget * | source() const |
- 1 个公有函数继承自 QGraphicsSceneEvent
- 6 个公有函数继承自 QEvent
其他继承的成员
详细描述
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, or GraphicsSceneDrop.
QGraphicsSceneDragDropEvent contains the position of the mouse cursor in both item, scene, and screen coordinates; this can be retrieved with pos(), scenePos(), and 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().
成员函数
QGraphicsSceneDragDropEvent::~QGraphicsSceneDragDropEvent()
Destroys the object.
void QGraphicsSceneDragDropEvent::acceptProposedAction()
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().
参见 dropAction(), setDropAction(), and proposedAction().
Qt::MouseButtons QGraphicsSceneDragDropEvent::buttons() const
Returns a Qt::MouseButtons value indicating which buttons were pressed on the mouse when this mouse event was generated.
参见 Qt::MouseButtons.
Qt::DropAction QGraphicsSceneDragDropEvent::dropAction() const
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().
参见 setDropAction() and acceptProposedAction().
const QMimeData *QGraphicsSceneDragDropEvent::mimeData() const
This function returns the MIME data of the event.
Qt::KeyboardModifiers QGraphicsSceneDragDropEvent::modifiers() const
Returns the keyboard modifiers that were pressed when the drag and drop event was created.
QPointF QGraphicsSceneDragDropEvent::pos() const
Returns the mouse position of the event relative to the view that sent the event.
参见 QGraphicsView, screenPos(), and scenePos().
Qt::DropActions QGraphicsSceneDragDropEvent::possibleActions() const
Returns the possible drop actions that the drag and drop can result in.
参见 Qt::DropActions.
Qt::DropAction QGraphicsSceneDragDropEvent::proposedAction() const
Returns the drop action that is proposed, i.e., preferred. The action must be one of the possible actions as defined by possibleActions().
参见 Qt::DropAction and possibleActions().
QPointF QGraphicsSceneDragDropEvent::scenePos() const
Returns the position of the mouse in scene coordinates.
QPoint QGraphicsSceneDragDropEvent::screenPos() const
Returns the position of the mouse relative to the screen.
void QGraphicsSceneDragDropEvent::setDropAction(Qt::DropAction action)
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. Call accept() in stead of acceptProposedAction() if you use this function.
参见 dropAction(), accept(), and possibleActions().
QWidget *QGraphicsSceneDragDropEvent::source() const
This function returns the QGraphicsView that created the QGraphicsSceneDragDropEvent.