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):
        try:
            ret = super().itemChange(change, value)
        except TypeError:
            return None
        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
