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client/dom/templates/html/dartium/impl_EventTarget.darttemplate

Index: client/dom/templates/html/dartium/impl_EventTarget.darttemplate
diff --git a/client/dom/templates/html/dartium/impl_EventTarget.darttemplate b/client/dom/templates/html/dartium/impl_EventTarget.darttemplate
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+// 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.
+
+class _EventsImpl implements Events {
+
+  final _EventTargetImpl _ptr;
+
+  final Map<String, EventListenerList> _listenerMap;
+
+  _EventsImpl(this._ptr) : _listenerMap = <EventListenerList>{};
+
+  EventListenerList operator [](String type) {
+    return _get(type.toLowerCase());
+  }
+  
+  EventListenerList _get(String type) {

[nweiz, 2012/03/01 21:18:03]

Why is this a separate method? Same with _add/_remove below.

+    return _listenerMap.putIfAbsent(type,
+      () => new _EventListenerListImpl(_ptr, type));
+  }
+}
+
+class _EventListenerWrapper {
+  final EventListener raw;
+  final Function wrapped;
+  final bool useCapture;
+  _EventListenerWrapper(this.raw, this.wrapped, this.useCapture);
+}
+
+class _EventListenerListImpl implements EventListenerList {
+  final _EventTargetImpl _ptr;
+  final String _type;
+  List<_EventListenerWrapper> _wrappers;
+
+  _EventListenerListImpl(this._ptr, this._type) :
+    // TODO(jacobr): switch to <_EventListenerWrapper>[] when the VM allow it.

[nweiz, 2012/03/01 21:18:03]

Issue number?

+    _wrappers = new List<_EventListenerWrapper>();
+
+  EventListenerList add(EventListener listener, [bool useCapture = false]) {
+    _add(listener, useCapture);
+    return this;
+  }
+
+  EventListenerList remove(EventListener listener, [bool useCapture = false]) {
+    _remove(listener, useCapture);
+    return this;
+  }
+
+  bool dispatch(Event evt) {
+    // TODO(jacobr): what is the correct behavior here. We could alternately

[nweiz, 2012/03/01 21:18:03]

I like asserting. If the type doesn't match it's almost certainly a bug.

+    // force the event to have the expected type.
+    assert(evt.type == _type);
+    return _ptr._dispatchEvent(_unwrap(evt));
+  }
+
+  void _add(EventListener listener, bool useCapture) {
+    _ptr._addEventListener(_type,
+                          _findOrAddWrapper(listener, useCapture),
+                          useCapture);
+  }
+
+  void _remove(EventListener listener, bool useCapture) {
+    Function wrapper = _removeWrapper(listener, useCapture);
+    if (wrapper !== null) {
+      _ptr._removeEventListener(_type, wrapper, useCapture);
+    }
+  }
+
+  Function _removeWrapper(EventListener listener, bool useCapture) {
+    if (_wrappers === null) {

[nweiz, 2012/03/01 21:18:03]

When is _wrappers ever null? Same question for _findOrAddWrapper.

+      return null;
+    }
+    for (int i = 0; i < _wrappers.length; i++) {

[nweiz, 2012/03/01 21:18:03]

Maybe it's my Ruby bias, but I hate mixing raw for loops with code. I'd make a
more generic _removeFirst(List, bool criterion(val)) function and call that
here.

+      _EventListenerWrapper wrapper = _wrappers[i];
+      if (wrapper.raw === listener && wrapper.useCapture == useCapture) {
+        // Order doesn't matter so we swap with the last element instead of
+        // performing a more expensive remove from the middle of the list.
+        if (i + 1 != _wrappers.length) {
+          _wrappers[i] = _wrappers.removeLast();
+        } else {
+          _wrappers.removeLast();
+        }
+        return wrapper.wrapped;
+      }
+    }
+    return null;
+  }
+
+  Function _findOrAddWrapper(EventListener listener, bool useCapture) {
+    if (_wrappers === null) {
+      _wrappers = <_EventListenerWrapper>[];
+    } else {
+      for (_EventListenerWrapper wrapper in _wrappers) {
+        if (wrapper.raw === listener && wrapper.useCapture == useCapture) {
+          return wrapper.wrapped;
+        }
+      }
+    }
+    final wrapped = (e) { listener(_wrap(e)); };

[nweiz, 2012/03/01 21:18:03]

Style nit: wrapped = listener . _wrap

Oh wait, wrong language.

+    _wrappers.add(new _EventListenerWrapper(listener, wrapped, useCapture));
+    return wrapped;
+  }
+}
+
+class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
+
+  Events _on;
+
+  Events get on() {
+    if (_on == null) _on = new _EventsImpl(this);
+    return _on;
+  }
+
+$!MEMBERS
+}