| /* |
| * Copyright 2015 Google Inc. All Rights Reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef COBALT_DOM_EVENT_LISTENER_H_ |
| #define COBALT_DOM_EVENT_LISTENER_H_ |
| |
| #include "base/memory/ref_counted.h" |
| #include "base/optional.h" |
| #include "cobalt/dom/event.h" |
| #include "cobalt/script/wrappable.h" |
| |
| namespace cobalt { |
| namespace dom { |
| |
| // The EventListener interface represents a callable object that will be called |
| // when an event is fired. |
| // https://www.w3.org/TR/2014/WD-dom-20140710/#eventtarget |
| class EventListener { |
| public: |
| // EventHandlers are implemented as EventListener?, so use this to |
| // differentiate between the two. |
| enum Type { |
| kAttribute, |
| kNotAttribute, |
| }; |
| |
| // Custom, not in any spec. |
| // |
| // Specify whether this is an attribute-type listener or not. |
| void HandleEvent(const scoped_refptr<Event>& event, Type listener_type) const; |
| |
| protected: |
| // Web API: EventListener |
| // |
| // Cobalt's implementation of callback interfaces requires the 'callback this' |
| // to be explicitly passed in. |
| virtual base::optional<bool> HandleEvent( |
| const scoped_refptr<script::Wrappable>& callback_this, |
| const scoped_refptr<Event>& event, bool* had_exception) const = 0; |
| }; |
| |
| } // namespace dom |
| } // namespace cobalt |
| |
| #endif // COBALT_DOM_EVENT_LISTENER_H_ |