Add Event delegation to Elements and groups of elements.

tools/dom/scripts/htmleventgenerator.py

 #!/usr/bin/python
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """This module provides functionality to generate dart:html event classes."""
 
 import logging
 import monitored
 
@@ skipping 254 matching lines @@
       members_emitter.Emit(
           "\n"
           "  $(ANNOTATIONS)static const EventStreamProvider<$TYPE> "
           "$(NAME)Event = const EventStreamProvider<$TYPE>('$DOM_NAME');\n",
           ANNOTATIONS=annotations,
           NAME=html_name,
           DOM_NAME=dom_name,
           TYPE=event_type)
 
   def EmitStreamGetters(self, interface, custom_events,
-      members_emitter, library_name):
+      members_emitter, library_name, stream_getter_signatures_emitter=None,
+      element_stream_getters_emitter=None):
     events = self._GetEvents(interface, custom_events)
     if not events:
       return
 
     for event_info in events:
       (dom_name, html_name, event_type) = event_info
       getter_name = 'on%s%s' % (html_name[:1].upper(), html_name[1:])
       annotation_name = 'on' + dom_name
 
       # If the provider is declared elsewhere, point to that.
       redirection = self._GetEventRedirection(interface, html_name, event_type)
       if redirection:
         provider = '%s.%sEvent' % (redirection, html_name)
       else:
         provider = html_name + 'Event'
 
       annotations = self._metadata.GetFormattedMetadata(
           library_name, interface, annotation_name, '  ')
 
-      members_emitter.Emit(
-          "\n"
-          "  $(ANNOTATIONS)Stream<$TYPE> get $(NAME) => "
-          "$PROVIDER.forTarget(this);\n",
-          ANNOTATIONS=annotations,
-          NAME=getter_name,
-          PROVIDER=provider,
-          TYPE=event_type)
+      isElement = False
+      for parent in self._database.Hierarchy(interface):
+        if parent.id == 'Element':
+          isElement = True
+      # We add the same event stream getters Element, ElementList, and
+      # _FrozenElementList. So, in impl_Element.darttemplate, we have two
+      # additional emitters to add the correct variation of the stream getter
+      # for that context.
+      for emitter in [members_emitter, stream_getter_signatures_emitter,
+          element_stream_getters_emitter]:
+        if emitter == None:
+          continue
+        elem_type = 'Element' if isElement else ''
+        call_name = 'forElement' if isElement else 'forTarget'
+        if emitter == element_stream_getters_emitter:
+          call_name = '_forElementList'
+        emitter.Emit(
+            "\n"
+            "  $(ANNOTATIONS)$(ELEM_TYPE)Stream<$TYPE> get $(NAME)$BODY;\n",
+            ANNOTATIONS=annotations,
+            ELEM_TYPE=elem_type,
+            NAME=getter_name,
+            BODY = ('' if emitter == stream_getter_signatures_emitter else
+                ' => %s.%s(this)' % (((''
+                if emitter != element_stream_getters_emitter else 'Element.')
+                  + provider), call_name)),
+            TYPE=event_type)
 
   def _GetRawEvents(self, interface):
     all_interfaces = ([ interface ] +
                       self._database.TransitiveSecondaryParents(interface))
     events = set([])
     for super_interface in all_interfaces:
       events = events.union(
         set([attr.id for attr in super_interface.attributes
              if attr.type.id == 'EventListener']))
     return events
@@ skipping 69 matching lines @@
     """
     key = '%s.%s' % (html_interface_name, dom_event_name)
     if key in _html_event_types:
       return _html_event_types[key]
     key = '*.%s' % dom_event_name
     if key in _html_event_types:
       return _html_event_types[key]
     _logger.warn('Cannot resolve event type for %s.%s' %
         (html_interface_name, dom_event_name))
     return None