1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef CHROME_BROWSER_ANDROID_META_TAG_OBSERVER_H_
6 #define CHROME_BROWSER_ANDROID_META_TAG_OBSERVER_H_
8 #include "content/public/browser/web_contents_observer.h"
12 // Retrieves the content of a particular meta tag when a page has fully loaded.
13 // Subclasses must implement |HandleMetaTagContent|, which gets called after
14 // the DOM has been scanned for the tag.
15 class MetaTagObserver : public content::WebContentsObserver {
17 explicit MetaTagObserver(const std::string& meta_tag);
18 virtual ~MetaTagObserver();
20 // content::WebContentsObserver overrides:
21 virtual void DidFinishLoad(
23 const GURL& validated_url,
25 content::RenderViewHost* render_view_host) OVERRIDE;
27 virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
30 // Called when the meta tag's content has been retrieved successfully.
31 virtual void HandleMetaTagContent(const std::string& tag_content,
32 const GURL& expected_url) = 0;
35 // Called when the renderer has returned information about the meta tag.
36 void OnDidRetrieveMetaTagContent(bool success,
37 const std::string& tag_name,
38 const std::string& tag_content,
39 const GURL& expected_url);
41 const std::string meta_tag_;
44 DISALLOW_COPY_AND_ASSIGN(MetaTagObserver);
47 #endif // CHROME_BROWSER_ANDROID_META_TAG_OBSERVER_H_