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'''Test cases for QObject.eventFilter'''
import unittest
import weakref
import sys
from PySide.QtCore import QObject, QTimerEvent
from helper import UsesQCoreApplication
class FilterObject(QObject):
'''Filter object for the basic test'''
def __init__(self, obj=None, event_type=None, *args):
#Creates a new filter object
QObject.__init__(self, *args)
self.obj = obj
self.event_type = event_type
self.events_handled = 0
self.events_bypassed = 0
def setTargetObject(self, obj):
#Sets the object that will be filtered
self.obj = obj
def eventFilter(self, obj, event):
'''Just checks if is the correct object and event type
incrementing counter until reaching the limit. After that it
stops filtering the events for the object.'''
if (self.obj == obj):
if isinstance(event, self.event_type) and self.events_handled < 5:
self.events_handled += 1
return True
else:
self.events_bypassed += 1
return False
else:
return QObject.eventFilter(self, obj, event)
class FilteredObject(QObject):
'''Class that will be filtered. Quits the app after 5 timer events'''
def __init__(self, app, *args):
QObject.__init__(self, *args)
self.app = app
self.times_called = 0
def timerEvent(self, evt):
#Overriden method
self.times_called += 1
if self.times_called == 5:
self.app.quit()
class TestQObjectEventFilterPython(UsesQCoreApplication):
'''QObject.eventFilter - Reimplemented in python
Filters 5 TimerEvents and then bypasses the other events to the
timerEvent method. After 5 runs, the timerEvent method will ask
the core application to exit'''
def setUp(self):
#Acquire resources
UsesQCoreApplication.setUp(self)
self.obj_filter = FilterObject(event_type=QTimerEvent)
def tearDown(self):
#Release resources
del self.obj_filter
UsesQCoreApplication.tearDown(self)
def testEventFilter(self):
#QObject.eventFilter reimplemented in python
filtered = FilteredObject(self.app)
filtered.installEventFilter(self.obj_filter)
self.obj_filter.setTargetObject(filtered)
filtered.startTimer(0)
self.app.exec_()
self.assertEqual(filtered.times_called, 5)
self.assertEqual(self.obj_filter.events_handled, 5)
def testInstallEventFilterRefCountAfterDelete(self):
'''Bug 910 - installEventFilter() increments reference count on target object
http://bugs.pyside.org/show_bug.cgi?id=910'''
obj = QObject()
filt = QObject()
self.assertEqual(sys.getrefcount(obj), 2)
self.assertEqual(sys.getrefcount(filt), 2)
obj.installEventFilter(filt)
self.assertEqual(sys.getrefcount(obj), 2)
self.assertEqual(sys.getrefcount(filt), 2)
wref = weakref.ref(obj)
del obj
self.assertEqual(wref(), None)
def testInstallEventFilterRefCountAfterRemove(self):
# Bug 910
obj = QObject()
filt = QObject()
self.assertEqual(sys.getrefcount(obj), 2)
self.assertEqual(sys.getrefcount(filt), 2)
obj.installEventFilter(filt)
self.assertEqual(sys.getrefcount(obj), 2)
self.assertEqual(sys.getrefcount(filt), 2)
obj.removeEventFilter(filt)
self.assertEqual(sys.getrefcount(obj), 2)
self.assertEqual(sys.getrefcount(filt), 2)
wref = weakref.ref(obj)
del obj
self.assertEqual(wref(), None)
if __name__ == '__main__':
unittest.main()
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