class XFormsEngine(object):
# NOTE: This assumes the document itself does not change underneath us.
def __init__(self, xform_doc_file):
self.doc_tree = build_xpath_tree(xform_doc_file)
self.doc_engine = ExpressionEngine(
self.doc_tree, variables={},
function_libraries=[XFormsFunctionLibrary()])
self.doc_event_manager = DOMEventFlowManager(self.doc_tree)
self._xev_cache = {}
self._models = {}
for model_node in self.xev('//xforms:model', self.doc_tree):
self._models[model_node] = XFormsModel(self, model_node)
def xev(self, expr, node=None, pos=1, size=1, replace_namespaces=True):
if replace_namespaces:
expr = self._replace_namespaces(expr)
ckey = (expr, node, pos, size)
if ckey not in self._xev_cache:
self._xev_cache[ckey] = self.doc_engine.evaluate(
expr, node, context_position=pos, context_size=size).value
return self._xev_cache[ckey]
def _replace_namespaces(self, expr):
for expr_prefix, expr_uri in NAMESPACES:
for prefix, uri in self.doc_tree._namespaces.items():
if uri == expr_uri:
expr = expr.replace(
'%s:' % (expr_prefix,), '%s:' % (prefix,))
break
return expr
def __init__(self, xform_doc_file):
self.doc_tree = build_xpath_tree(xform_doc_file)
self.doc_engine = ExpressionEngine(
self.doc_tree, variables={},
function_libraries=[XFormsFunctionLibrary()])
self.doc_event_manager = DOMEventFlowManager(self.doc_tree)
self._xev_cache = {}
self._models = {}
for model_node in self.xev('//xforms:model', self.doc_tree):
self._models[model_node] = XFormsModel(self, model_node)
def setUp(self):
self.doc = build_xpath_tree(make_doc(EVENTS_XML))
self.engine = ExpressionEngine(self.doc)
self.manager = DOMEventFlowManager(self.doc)
class DOMEventFlowManagerTestCase(TestCase):
def setUp(self):
self.doc = build_xpath_tree(make_doc(EVENTS_XML))
self.engine = ExpressionEngine(self.doc)
self.manager = DOMEventFlowManager(self.doc)
def get_node(self, expr):
[node] = self.engine.evaluate(expr, self.doc).value
return node
def add_listener(self, target_expr, event_type, listener, capture=False):
target = self.get_node(target_expr)
self.manager.add_event_listener(target, event_type, listener, capture)
def make_incr_handler(self, data, key):
def handler(event):
data.setdefault(key, 0)
data[key] += 1
return handler
def test_dispatch_events_no_listeners(self):
self.manager.dispatch_event(self.get_node('/'), ToyEvent())
self.manager.dispatch_event(self.get_node('//elem1'), ToyEvent())
self.manager.dispatch_event(self.get_node('//elem2'), ToyEvent())
self.manager.dispatch_event(self.get_node('//elem3'), ToyEvent())
def test_dispatch_event_target_listeners(self):
data = {}
listener1 = self.make_incr_handler(data, 'listener1')
listener2 = self.make_incr_handler(data, 'listener2')
self.add_listener('//elem1', 'toy-event', listener1)
self.add_listener('//elem2', 'toy-event', listener1)
self.add_listener('//elem3', 'toy-event', listener1)
self.add_listener('//elem2', 'toy-event', listener2)
self.assertEqual(data, {})
self.manager.dispatch_event(self.get_node('//elem2'), ToyEvent())
self.assertEqual(data, {'listener1': 1, 'listener2': 1})
def test_dispatch_event_target_and_bubble_listeners(self):
data = {}
listener1 = self.make_incr_handler(data, 'listener1')
listener2 = self.make_incr_handler(data, 'listener2')
self.add_listener('//elem1', 'bubble-event', listener1)
self.add_listener('//elem2', 'bubble-event', listener1)
self.add_listener('//elem3', 'bubble-event', listener1)
self.add_listener('//elem2', 'bubble-event', listener2)
self.assertEqual(data, {})
self.manager.dispatch_event(self.get_node('//elem2'), BubbleEvent())
self.assertEqual(data, {'listener1': 2, 'listener2': 1})
def test_dispatch_event_bubble_listeners(self):
data = {}
listener1 = self.make_incr_handler(data, 'listener1')
self.add_listener('//elem1', 'bubble-event', listener1)
self.add_listener('//elem2', 'bubble-event', listener1)
self.assertEqual(data, {})
self.manager.dispatch_event(self.get_node('//elem3'), BubbleEvent())
self.assertEqual(data, {'listener1': 2})
def test_dispatch_event_target_capture_listeners(self):
data = {}
listener1 = self.make_incr_handler(data, 'listener1')
listener2 = self.make_incr_handler(data, 'listener2')
self.add_listener('//elem1', 'toy-event', listener1, True)
self.add_listener('//elem2', 'toy-event', listener1, True)
self.add_listener('//elem3', 'toy-event', listener1, True)
self.add_listener('//elem2', 'toy-event', listener2)
self.assertEqual(data, {})
self.manager.dispatch_event(self.get_node('//elem2'), ToyEvent())
self.assertEqual(data, {'listener1': 1, 'listener2': 1})
def test_dispatch_event_target_capture_bubble_listeners(self):
data = {}
listener1 = self.make_incr_handler(data, 'listener1')
listener2 = self.make_incr_handler(data, 'listener2')
self.add_listener('//elem1', 'bubble-event', listener1, True)
self.add_listener('//elem2', 'bubble-event', listener1, True)
self.add_listener('//elem3', 'bubble-event', listener1, True)
self.add_listener('//elem1', 'bubble-event', listener2)
self.add_listener('//elem2', 'bubble-event', listener2)
self.add_listener('//elem3', 'bubble-event', listener2)
self.assertEqual(data, {})
self.manager.dispatch_event(self.get_node('//elem2'), BubbleEvent())
self.assertEqual(data, {'listener1': 1, 'listener2': 2})
