| /* |
| * Copyright 2017 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_ACCESSIBILITY_FOCUS_OBSERVER_H_ |
| #define COBALT_ACCESSIBILITY_FOCUS_OBSERVER_H_ |
| |
| #include "base/memory/scoped_ptr.h" |
| #include "cobalt/accessibility/tts_engine.h" |
| #include "cobalt/dom/document.h" |
| |
| namespace cobalt { |
| namespace accessibility { |
| // FocusObserver registers an observer on the document such that it can be |
| // notified whenever the document's focused element changes. Upon change of the |
| // focused element, FocusObserver will calculate the text contents of the newly |
| // focused element and send that string to a TTSEngine. |
| class FocusObserver : public dom::DocumentObserver { |
| public: |
| FocusObserver(dom::Document* document, scoped_ptr<TTSEngine> tts_engine); |
| |
| protected: |
| ~FocusObserver(); |
| void OnLoad() OVERRIDE {} |
| void OnMutation() OVERRIDE {} |
| void OnFocusChanged() OVERRIDE; |
| |
| private: |
| dom::Document* document_; |
| scoped_ptr<TTSEngine> tts_engine_; |
| |
| friend class scoped_ptr<FocusObserver>; |
| DISALLOW_COPY_AND_ASSIGN(FocusObserver); |
| }; |
| } // namespace accessibility |
| } // namespace cobalt |
| |
| #endif // COBALT_ACCESSIBILITY_FOCUS_OBSERVER_H_ |