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client/html/src/EventTargetWrappingImplementation.dart

-// 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 EventsImplementation implements Events {
-  /* Raw event target. */
-  var _ptr;
-
-  Map<String, EventListenerList> _listenerMap;
-
-  EventsImplementation._wrap(this._ptr) {
-    _listenerMap = <EventListenerList>{};
-  }
-
-  EventListenerList operator [](String type) {
-    return _get(type.toLowerCase());
-  }
-  
-  EventListenerList _get(String type) {
-    return _listenerMap.putIfAbsent(type,
-      () => new EventListenerListImplementation(_ptr, type));
-  }
-}
-
-class _EventListenerWrapper {
-  final EventListener raw;
-  final Function wrapped;
-  final bool useCapture;
-  _EventListenerWrapper(this.raw, this.wrapped, this.useCapture);
-}
-
-class EventListenerListImplementation implements EventListenerList {
-  final _ptr;
-  final String _type;
-  List<_EventListenerWrapper> _wrappers;
-
-  EventListenerListImplementation(this._ptr, this._type) :
-    // TODO(jacobr): switch to <_EventListenerWrapper>[] when the VM allow it.
-    _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
-    // force the event to have the expected type.
-    assert(evt.type == _type);
-    return _ptr.dispatchEvent(LevelDom.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) {
-      return null;
-    }
-    for (int i = 0; i < _wrappers.length; i++) {
-      _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(LevelDom.wrapEvent(e)); };
-    _wrappers.add(new _EventListenerWrapper(listener, wrapped, useCapture));
-    return wrapped;
-  }
-}
-
-class EventTargetWrappingImplementation extends DOMWrapperBase implements EventTarget {
-  Events _on;
-
-  EventTargetWrappingImplementation._wrap(ptr) : super._wrap(ptr);
-
-  Events get on() {
-    if (_on === null) {
-      _on = new EventsImplementation._wrap(_ptr);
-    }
-    return _on;
-  }
-}