Updates the interface to reflect that the splitter is collapsed.
        
        :param      direction | <XSplitterHandle.CollapseDirection>
                    sizes     | [<int>, ..]

def markCollapsed( self, direction, sizes ):
        """
        Updates the interface to reflect that the splitter is collapsed.
        
        :param      direction | <XSplitterHandle.CollapseDirection>
                    sizes     | [<int>, ..]
        """
        self._collapsed = True
        self._storedSizes = sizes[:]
        
        if ( direction == XSplitterHandle.CollapseDirection.Before ):
            if ( self.orientation() == Qt.Horizontal ):
                self._collapseAfter.setArrowType( Qt.RightArrow )
                self._collapseBefore.setArrowType( Qt.RightArrow )
            else:
                self._collapseAfter.setArrowType( Qt.DownArrow )
                self._collapseBefore.setArrowType( Qt.DownArrow )
        else:
            if ( self.orientation() == Qt.Horizontal ):
                self._collapseAfter.setArrowType( Qt.LeftArrow )
                self._collapseBefore.setArrowType( Qt.LeftArrow )
            else:
                self._collapseAfter.setArrowType( Qt.UpArrow )
                self._collapseAfter.setArrowType( Qt.UpArrow )