thumbnail_source.h revision ddb351dbec246cf1fab5ec20d2d5520909041de1 
1// Copyright (c) 2011 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.
4
5#ifndef CHROME_BROWSER_UI_WEBUI_THUMBNAIL_SOURCE_H_
6#define CHROME_BROWSER_UI_WEBUI_THUMBNAIL_SOURCE_H_
7#pragma once
8
9#include <string>
10
11#include "base/basictypes.h"
12#include "base/memory/ref_counted.h"
13#include "base/memory/ref_counted_memory.h"
14#include "chrome/browser/ui/webui/chrome_url_data_manager.h"
15
16class Profile;
17
18namespace history {
19class TopSites;
20}
21
22// ThumbnailSource is the gateway between network-level chrome: requests for
23// thumbnails and the history/top-sites backend that serves these.
24class ThumbnailSource : public ChromeURLDataManager::DataSource {
25 public:
26  explicit ThumbnailSource(Profile* profile);
27
28  // Called when the network layer has requested a resource underneath
29  // the path we registered.
30  virtual void StartDataRequest(const std::string& path,
31                                bool is_incognito,
32                                int request_id);
33
34  virtual std::string GetMimeType(const std::string& path) const;
35
36  virtual MessageLoop* MessageLoopForRequestPath(const std::string& path) const;
37
38 private:
39  virtual ~ThumbnailSource();
40
41  // Send the default thumbnail when we are missing a real one.
42  void SendDefaultThumbnail(int request_id);
43
44  // Raw PNG representation of the thumbnail to show when the thumbnail
45  // database doesn't have a thumbnail for a webpage.
46  scoped_refptr<RefCountedMemory> default_thumbnail_;
47
48  // TopSites.
49  scoped_refptr<history::TopSites> top_sites_;
50
51  DISALLOW_COPY_AND_ASSIGN(ThumbnailSource);
52};
53
54#endif  // CHROME_BROWSER_UI_WEBUI_THUMBNAIL_SOURCE_H_
55