QGraphicsObject Class Reference
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QtGui

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The QGraphicsObject class provides a base class for all graphics items that require signals, slots and properties. 更多...

继承 QObject and QGraphicsItem .

Inherited by QDeclarativeItem , QGraphicsSvgItem , QGraphicsTextItem and QGraphicsWidget .

方法

__init__ ( self , QGraphicsItem parent = None)
grabGesture ( self , Qt.GestureType type , Qt.GestureFlags flags = Qt.GestureFlags(0))
ungrabGesture ( self , Qt.GestureType type )
updateMicroFocus ( self )

Qt Signals

void enabledChanged ()
void opacityChanged ()
void parentChanged ()
void rotationChanged ()
void scaleChanged ()
void visibleChanged ()
void xChanged ()
void yChanged ()
void zChanged ()

详细描述

The QGraphicsObject class provides a base class for all graphics items that require signals, slots and properties.

类扩展 QGraphicsItem with QObject 's signal/slot and property mechanisms. It maps many of QGraphicsItem 's basic setters and getters to properties and adds notification signals for many of them.

父级和子级

Each graphics object can be constructed with a parent item. This ensures that the item will be destroyed when its parent item is destroyed. Although QGraphicsObject inherits from both QObject and QGraphicsItem , you should use the functions provided by QGraphicsItem , not QObject , to manage the relationships between parent and child items.

The relationships between items can be explored using the parentItem () 和 childItems () 函数。 In the hierarchy of items in a scene, the parentObject () 和 parentWidget () functions are the equivalent of the QWidget.parent () 和 QWidget.parentWidget () functions for QWidget 子类。

方法文档编制

QGraphicsObject.init ( self , QGraphicsItem parent = None)

parent argument, if not None, causes self to be owned by Qt instead of PyQt.

构造 QGraphicsObject with parent .

QGraphicsObject.grabGesture ( self , Qt.GestureType type , Qt.GestureFlags flags = Qt.GestureFlags(0))

Subscribes the graphics object to the given gesture with specific flags .

另请参阅 ungrabGesture () 和 QGestureEvent .

QGraphicsObject.ungrabGesture ( self , Qt.GestureType type )

Unsubscribes the graphics object from the given gesture .

另请参阅 grabGesture () 和 QGestureEvent .

QGraphicsObject.updateMicroFocus ( self )

This method is also a Qt slot with the C++ signature void updateMicroFocus() .

Updates the item's micro focus. This is slot for convenience.

该函数在 Qt 4.7 引入。

另请参阅 QInputContext .