| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef CHROME_BROWSER_ANDROID_META_TAG_OBSERVER_H_ |
| #define CHROME_BROWSER_ANDROID_META_TAG_OBSERVER_H_ |
| |
| #include "content/public/browser/web_contents_observer.h" |
| |
| class GURL; |
| |
| // Retrieves the content of a particular meta tag when a page has fully loaded. |
| // Subclasses must implement |HandleMetaTagContent|, which gets called after |
| // the DOM has been scanned for the tag. |
| class MetaTagObserver : public content::WebContentsObserver { |
| public: |
| explicit MetaTagObserver(const std::string& meta_tag); |
| virtual ~MetaTagObserver(); |
| |
| // content::WebContentsObserver overrides: |
| virtual void DidFinishLoad( |
| int64 frame_id, |
| const GURL& validated_url, |
| bool is_main_frame, |
| content::RenderViewHost* render_view_host) OVERRIDE; |
| |
| virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE; |
| |
| protected: |
| // Called when the meta tag's content has been retrieved successfully. |
| virtual void HandleMetaTagContent(const std::string& tag_content, |
| const GURL& expected_url) = 0; |
| |
| private: |
| // Called when the renderer has returned information about the meta tag. |
| void OnDidRetrieveMetaTagContent(bool success, |
| const std::string& tag_name, |
| const std::string& tag_content, |
| const GURL& expected_url); |
| |
| const std::string meta_tag_; |
| GURL validated_url_; |
| |
| DISALLOW_COPY_AND_ASSIGN(MetaTagObserver); |
| }; |
| |
| #endif // CHROME_BROWSER_ANDROID_META_TAG_OBSERVER_H_ |