chrome/browser/thumbnails/thumbnail_list_source.h

   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.
   4
   5 #ifndef CHROME_BROWSER_THUMBNAILS_THUMBNAIL_LIST_SOURCE_H_
   6 #define CHROME_BROWSER_THUMBNAILS_THUMBNAIL_LIST_SOURCE_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/memory/ref_counted.h"
  12 #include "base/memory/weak_ptr.h"
  13 #include "components/history/core/browser/history_types.h"
  14 #include "content/public/browser/url_data_source.h"
  15
  16 class Profile;
  17
  18 namespace base {
  19 class RefCountedMemory;
  20 }
  21
  22 namespace thumbnails {
  23 class ThumbnailService;
  24 }
  25
  26 // ThumbnailListSource renders a webpage to list all thumbnails stored in
  27 // TopSites, along with all associated URLs. The thumbnail images are embedded
  28 // into the HTML via Base64, so we can easily produce a dump of TopSites and
  29 // the thumbnails it stores.
  30 class ThumbnailListSource : public content::URLDataSource {
  31  public:
  32   explicit ThumbnailListSource(Profile* profile);
  33
  34   // content::URLDataSource implementation.
  35   std::string GetSource() const override;
  36   void StartDataRequest(
  37       const std::string& path,
  38       int render_process_id,
  39       int render_frame_id,
  40       const content::URLDataSource::GotDataCallback& callback) override;
  41   std::string GetMimeType(const std::string& path) const override;
  42   base::MessageLoop* MessageLoopForRequestPath(
  43       const std::string& path) const override;
  44   bool ShouldServiceRequest(const net::URLRequest* request) const override;
  45   bool ShouldReplaceExistingSource() const override;
  46
  47  private:
  48   ~ThumbnailListSource() override;
  49
  50   void OnMostVisitedURLsAvailable(
  51     const content::URLDataSource::GotDataCallback& callback,
  52     const history::MostVisitedURLList& mvurl_list);
  53
  54   // ThumbnailService.
  55   scoped_refptr<thumbnails::ThumbnailService> thumbnail_service_;
  56
  57   // Only used when servicing requests on the UI thread.
  58   Profile* const profile_;
  59
  60   // For callbacks may be run after destruction.
  61   base::WeakPtrFactory<ThumbnailListSource> weak_ptr_factory_;
  62
  63   DISALLOW_COPY_AND_ASSIGN(ThumbnailListSource);
  64 };
  65
  66
  67 #endif  // CHROME_BROWSER_THUMBNAILS_THUMBNAIL_LIST_SOURCE_H_