test_ref_cycles.py 文件源码

def test_PlotWidget():
    def mkobjs(*args, **kwds):
        w = pg.PlotWidget(*args, **kwds)
        data = pg.np.array([1,5,2,4,3])
        c = w.plot(data, name='stuff')
        w.addLegend()

        # test that connections do not keep objects alive
        w.plotItem.vb.sigRangeChanged.connect(mkrefs)
        app.focusChanged.connect(w.plotItem.vb.invertY)

        # return weakrefs to a bunch of objects that should die when the scope exits.
        return mkrefs(w, c, data, w.plotItem, w.plotItem.vb, w.plotItem.getMenu(), w.plotItem.getAxis('left'))

    for i in range(5):
        assert_alldead(mkobjs())