41 lines
1.8 KiB
Python
41 lines
1.8 KiB
Python
# -*- coding: utf-8 -*-
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from ..Qt import QtGui, QT_LIB
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if QT_LIB.startswith('PyQt'):
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from ..Qt import sip
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from .GraphicsItem import GraphicsItem
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__all__ = ['GraphicsObject']
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class GraphicsObject(GraphicsItem, QtGui.QGraphicsObject):
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"""
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**Bases:** :class:`GraphicsItem <pyqtgraph.graphicsItems.GraphicsItem>`, :class:`QtGui.QGraphicsObject`
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Extension of QGraphicsObject with some useful methods (provided by :class:`GraphicsItem <pyqtgraph.graphicsItems.GraphicsItem>`)
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"""
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_qtBaseClass = QtGui.QGraphicsObject
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def __init__(self, *args):
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self.__inform_view_on_changes = True
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QtGui.QGraphicsObject.__init__(self, *args)
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self.setFlag(self.GraphicsItemFlag.ItemSendsGeometryChanges)
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GraphicsItem.__init__(self)
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def itemChange(self, change, value):
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ret = super().itemChange(change, value)
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if change in [self.GraphicsItemChange.ItemParentHasChanged, self.GraphicsItemChange.ItemSceneHasChanged]:
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self.parentChanged()
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try:
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inform_view_on_change = self.__inform_view_on_changes
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except AttributeError:
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# It's possible that the attribute was already collected when the itemChange happened
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# (if it was triggered during the gc of the object).
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pass
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else:
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if inform_view_on_change and change in [self.GraphicsItemChange.ItemPositionHasChanged, self.GraphicsItemChange.ItemTransformHasChanged]:
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self.informViewBoundsChanged()
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## workaround for pyqt bug:
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## http://www.riverbankcomputing.com/pipermail/pyqt/2012-August/031818.html
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if QT_LIB == 'PyQt5' and change == self.GraphicsItemChange.ItemParentChange and isinstance(ret, QtGui.QGraphicsItem):
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ret = sip.cast(ret, QtGui.QGraphicsItem)
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return ret
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