from ..Qt import QtGui, QtCore, QT_LIB
if QT_LIB.startswith('PyQt'):
from ..Qt import sip
from .GraphicsItem import GraphicsItem
__all__ = ['GraphicsObject']
[docs]class GraphicsObject(GraphicsItem, QtGui.QGraphicsObject):
"""
**Bases:** :class:`GraphicsItem <pyqtgraph.graphicsItems.GraphicsItem>`, :class:`QtGui.QGraphicsObject`
Extension of QGraphicsObject with some useful methods (provided by :class:`GraphicsItem <pyqtgraph.graphicsItems.GraphicsItem>`)
"""
_qtBaseClass = QtGui.QGraphicsObject
[docs] def __init__(self, *args):
self.__inform_view_on_changes = True
QtGui.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.parentChanged()
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()
## workaround for pyqt bug:
## http://www.riverbankcomputing.com/pipermail/pyqt/2012-August/031818.html
if QT_LIB == 'PyQt5' and change == self.GraphicsItemChange.ItemParentChange and isinstance(ret, QtGui.QGraphicsItem):
ret = sip.cast(ret, QtGui.QGraphicsItem)
return ret