def _left_down ( self, event ):
        sizer = self.sizer
        if sizer is not None:
            object = sizer.ObjectAt( event.GetX(), event.GetY() )
            if object is not None:
                self._owner = object
                self.control.CaptureMouse()
                object.mouse_down( event )

    #---------------------------------------------------------------------------
    #  Handles the left mouse button being released:
    #---------------------------------------------------------------------------
Given a unicode string, return its printable length on a terminal.
dataset/ETHPy150Open enthought/pyface/pyface/dock/dock_window.py/DockWindow._left_down--crossover with--dataset/ETHPy150Open mgaitan/sublime-rst-completion/wcwidth/wcwidth/wcwidth.py/wcswidth