pyqtgraph/tests/test_ref_cycles.py

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# -*- coding: utf-8 -*-
"""
Test for unwanted reference cycles
"""
import pyqtgraph as pg
import numpy as np
import weakref
import warnings
app = pg.mkQApp()
def assert_alldead(refs):
for ref in refs:
assert ref() is None
def qObjectTree(root):
"""Return root and its entire tree of qobject children"""
childs = [root]
for ch in pg.QtCore.QObject.children(root):
childs += qObjectTree(ch)
return childs
def mkrefs(*objs):
"""Return a list of weakrefs to each object in *objs.
QObject instances are expanded to include all child objects.
"""
allObjs = {}
for obj in objs:
if isinstance(obj, pg.QtCore.QObject):
obj = qObjectTree(obj)
else:
obj = [obj]
for o in obj:
allObjs[id(o)] = o
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return [weakref.ref(obj) for obj in allObjs.values()]
def test_PlotWidget():
def mkobjs(*args, **kwds):
with warnings.catch_warnings():
warnings.simplefilter("ignore")
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'))
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for i in range(5):
assert_alldead(mkobjs())
def test_GraphicsWindow():
def mkobjs():
with warnings.catch_warnings():
warnings.simplefilter("ignore")
w = pg.GraphicsWindow()
p1 = w.addPlot()
v1 = w.addViewBox()
return mkrefs(w, p1, v1)
for i in range(5):
assert_alldead(mkobjs())
def test_ImageView():
def mkobjs():
iv = pg.ImageView()
data = np.zeros((10,10,5))
iv.setImage(data)
return mkrefs(iv, iv.imageItem, iv.view, iv.ui.histogram, data)
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for i in range(5):
assert_alldead(mkobjs())
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if __name__ == '__main__':
ot = test_PlotItem()