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from ..Qt import QtWidgets
from .GraphicsItem import GraphicsItem
__all__ = ['GraphicsObject']
class GraphicsObject(GraphicsItem, QtWidgets.QGraphicsObject):
"""
**Bases:** :class:`GraphicsItem <pyqtgraph.GraphicsItem>`, :class:`QtWidgets.QGraphicsObject`
Extension of QGraphicsObject with some useful methods (provided by :class:`GraphicsItem <pyqtgraph.GraphicsItem>`)
"""
def __init__(self, *args):
self.__inform_view_on_changes = True
QtWidgets.QGraphicsObject.__init__(self, *args)
self.setFlag(self.GraphicsItemFlag.ItemSendsGeometryChanges)
GraphicsItem.__init__(self)
def itemChange(self, change, value):
ret = super().itemChange(change, value)
if change in [self.GraphicsItemChange.ItemParentHasChanged, self.GraphicsItemChange.ItemSceneHasChanged]:
self.changeParent()
try:
inform_view_on_change = self.__inform_view_on_changes
except AttributeError:
# It's possible that the attribute was already collected when the itemChange happened
# (if it was triggered during the gc of the object).
pass
else:
if inform_view_on_change and change in [self.GraphicsItemChange.ItemPositionHasChanged, self.GraphicsItemChange.ItemTransformHasChanged]:
self.informViewBoundsChanged()
return ret
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