QGraphicsObject Class▲
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Header: QGraphicsObject
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CMake:
find_package(Qt6 REQUIRED COMPONENTS Widgets)
target_link_libraries(mytarget PRIVATE Qt6::Widgets)
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qmake: QT += widgets
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Inherits: QObject and QGraphicsItem
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Inherited By: QGraphicsSvgItem, QGraphicsTextItem, QGraphicsVideoItem, and QGraphicsWidget
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Group: QGraphicsObject is part of graphicsview-api
Detailed Description▲
The class extends a 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.
Parents and Children▲
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() and childItems() functions. In the hierarchy of items in a scene, the parentObject() and parentWidget() functions are the equivalent of the QWidget::parent() and QWidget::parentWidget() functions for QWidget subclasses.
See Also▲
See also QGraphicsWidget
Property Documentation▲
effect : QGraphicsEffect* const▲
This property holds the effect attached to this item
See Also▲
enabled : const bool▲
This property holds whether the item is enabled or not
This property is declared in QGraphicsItem.
By default, this property is true.
Notifier signal:
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void enabledChanged()
See Also▲
See also QGraphicsItem::isEnabled(), QGraphicsItem::setEnabled()
opacity : const qreal▲
This property holds the opacity of the item
Notifier signal:
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void opacityChanged()
See Also▲
See also QGraphicsItem::setOpacity(), QGraphicsItem::opacity()
parent : QGraphicsObject* const▲
This property holds the parent of the item
The item's parent is set independently of the parent object returned by QObject::parent().
Notifier signal:
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void parentChanged()
See Also▲
See also QGraphicsItem::setParentItem(), QGraphicsItem::parentObject()
pos : const QPointF▲
This property holds the position of the item
Describes the items position.
See Also▲
See also QGraphicsItem::setPos(), QGraphicsItem::pos()
rotation : const qreal▲
This property holds the rotation of the item in degrees.
This specifies how many degrees to rotate the item around its transformOrigin. The default rotation is 0 degrees (i.e. not rotated at all).
Notifier signal:
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void rotationChanged()
scale : const qreal▲
This property holds the scale of the item.
A scale of less than 1 means the item will be displayed smaller than normal, and a scale of greater than 1 means the item will be displayed larger than normal. A negative scale means the item will be mirrored.
By default, items are displayed at a scale of 1 (i.e. at their normal size).
Scaling is from the item's transformOrigin.
Notifier signal:
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void scaleChanged()
transformOriginPoint : const QPointF▲
This property holds the transformation origin
This property sets a specific point in the item's coordinate system as the origin for scale and rotation.
See Also▲
See also scale, rotation, QGraphicsItem::transformOriginPoint()
visible : const bool▲
This property holds whether the item is visible or not
This property is declared in QGraphicsItem.
By default, this property is true.
Notifier signal:
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void visibleChanged()
See Also▲
See also QGraphicsItem::isVisible(), QGraphicsItem::setVisible()
x : const qreal▲
This property holds the x position of the item
Describes the items x position.
Notifier signal:
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void xChanged()
See Also▲
See also QGraphicsItem::setX(), setPos()
y : const qreal▲
This property holds the y position of the item
Describes the items y position.
Notifier signal:
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void yChanged()
See Also▲
See also QGraphicsItem::setY(), setPos()
z : const qreal▲
This property holds the z value of the item
Describes the items z value.
Notifier signal:
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void zChanged()
See Also▲
See also QGraphicsItem::setZValue(), zValue()
Member Function Documentation▲
[explicit] QGraphicsObject::QGraphicsObject(QGraphicsItem *parent = nullptr)▲
Constructs a QGraphicsObject with parent.
[virtual] QGraphicsObject::~QGraphicsObject()▲
Destructor.
void QGraphicsObject::enabledChanged()▲
This signal gets emitted whenever the item gets enabled or disabled.
Notifier signal for property enabled.
See Also▲
See also isEnabled()
[override virtual protected] bool QGraphicsObject::event(QEvent *ev)▲
Reimplements: QObject::event(QEvent *e).
void QGraphicsObject::grabGesture(Qt::GestureType gesture, Qt::GestureFlags flags = Qt::GestureFlags())▲
Subscribes the graphics object to the given gesture with specific flags.
See Also▲
See also ungrabGesture(), QGestureEvent
void QGraphicsObject::opacityChanged()▲
This signal gets emitted whenever the opacity of the item changes
Notifier signal for property opacity.
See Also▲
See also QGraphicsItem::opacity()
void QGraphicsObject::parentChanged()▲
This signal gets emitted whenever the parent of the item changes
Notifier signal for property parent.
void QGraphicsObject::rotationChanged()▲
This signal gets emitted whenever the rotation of the item changes.
Notifier signal for property rotation.
void QGraphicsObject::scaleChanged()▲
This signal is emitted when the scale of the item changes.
Notifier signal for property scale.
void QGraphicsObject::ungrabGesture(Qt::GestureType gesture)▲
Unsubscribes the graphics object from the given gesture.
See Also▲
See also grabGesture(), QGestureEvent
[protected] void QGraphicsObject::updateMicroFocus()▲
void QGraphicsObject::visibleChanged()▲
This signal gets emitted whenever the visibility of the item changes
Notifier signal for property visible.
See Also▲
See also visible
void QGraphicsObject::xChanged()▲
This signal gets emitted whenever the x position of the item changes
Notifier signal for property x.
See Also▲
See also pos()
void QGraphicsObject::yChanged()▲
This signal gets emitted whenever the y position of the item changes.
Notifier signal for property y.
See Also▲
See also pos()