def collapse( self, direction ):
        """
        Collapses this splitter handle before or after other widgets based on \
        the inputed CollapseDirection.
        
        :param      direction | <XSplitterHandle.CollapseDirection>
        
        :return     <bool> | success
        """
        if ( self.isCollapsed() ):
            return False
        
        splitter = self.parent()
        if ( not splitter ):
            return False
        
        sizes   = splitter.sizes()
        handles = [splitter.handle(i) for i in range(len(sizes))]
        index   = handles.index(self)
        
        self.markCollapsed(direction, sizes)
        
        # determine the sizes to use based on the direction
        if ( direction == XSplitterHandle.CollapseDirection.Before ):
            sizes = [0 for i in range(i)] + sizes[i+1:]
        else:
            sizes = sizes[:i] + [0 for i in range(i, len(sizes))]
        
        splitter.setSizes(sizes)
        return True
Collapses this splitter handle before or after other widgets based on \
        the inputed CollapseDirection.
        
        :param      direction | <XSplitterHandle.CollapseDirection>
        
        :return     <bool> | success