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"""Test the wrapping of vtkCommand
The following vtkCommmand functionality must be tested
- Event enum constants
- Event names
- Adding/removing observers
Created on Mar 22, 2012 by David Gobbi
"""
import sys
import exceptions
import gc
import vtk
from vtk.test import Testing
class callback:
def __init__(self):
self.caller = None
self.event = None
def __call__(self, o, e):
self.caller = o
self.event = e
class TestCommand(Testing.vtkTest):
def testEnumConstants(self):
"""Make sure the event id constants are wrapped
"""
self.assertEqual(vtk.vtkCommand.ErrorEvent, 39)
def testCommandWithArgs(self):
"""Test binding a command that has arguments.
"""
cb = callback()
o = vtk.vtkObject()
o.AddObserver(vtk.vtkCommand.ModifiedEvent, cb)
o.Modified()
self.assertEqual(cb.caller, o)
self.assertEqual(cb.event, "ModifiedEvent")
def testUseEventNameString(self):
"""Test binding with a string event name.
"""
cb = callback()
o = vtk.vtkObject()
o.AddObserver("ModifiedEvent", cb)
o.Modified()
self.assertEqual(cb.caller, o)
self.assertEqual(cb.event, "ModifiedEvent")
def testPriorityArg(self):
"""Test the optional priority argument
"""
cb = callback()
o = vtk.vtkObject()
o.AddObserver(vtk.vtkCommand.ModifiedEvent, cb, 0.5)
o.Modified()
self.assertEqual(cb.caller, o)
def testRemoveCommand(self):
"""Test the removal of an observer.
"""
cb = callback()
o = vtk.vtkObject()
o.AddObserver(vtk.vtkCommand.ModifiedEvent, cb)
o.Modified()
self.assertEqual(cb.caller, o)
o.RemoveObservers(vtk.vtkCommand.ModifiedEvent)
cb.caller = None
cb.event = None
o.Modified()
self.assertEqual(cb.caller, None)
def testGetCommand(self):
"""Test getting the vtkCommand object
"""
cb = callback()
o = vtk.vtkObject()
n = o.AddObserver(vtk.vtkCommand.ModifiedEvent, cb)
o.Modified()
self.assertEqual(cb.caller, o)
c = o.GetCommand(n)
self.assertEqual((c.IsA("vtkCommand") != 0), True)
# in the future, o.RemoveObserver(c) should also be made to work
o.RemoveObserver(n)
cb.caller = None
cb.event = None
o.Modified()
self.assertEqual(cb.caller, None)
def testCommandCircularRef(self):
"""Test correct reference loop reporting for commands
"""
cb = callback()
o = vtk.vtkObject()
o.AddObserver(vtk.vtkCommand.ModifiedEvent, cb)
cb.circular_ref = o
# referent to check if "o" is deleted
referent = vtk.vtkObject()
o.referent = referent
# make sure gc removes referer "o" from referent
s1 = repr(gc.get_referrers(referent))
del o
del cb
gc.collect()
s2 = repr(gc.get_referrers(referent))
self.assertNotEqual(s1, s2)
self.assertNotEqual(s1.count("vtkObject"),0)
self.assertEqual(s2.count("vtkObject"),0)
if __name__ == "__main__":
Testing.main([(TestCommand, 'test')])
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