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"""
Test for unwanted reference cycles
"""
import warnings
import weakref
import numpy as np
import pyqtgraph as pg
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:
obj = qObjectTree(obj) if isinstance(obj, pg.QtCore.QObject) else [obj]
for o in obj:
allObjs[id(o)] = o
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 = 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.getAxis('left'))
for _ 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)
for _ in range(5):
assert_alldead(mkobjs())
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