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 history {
  23 class TopSites;
  24 }
  25
  26 namespace thumbnails {
  27 class ThumbnailService;
  28 }
  29
  30 // ThumbnailListSource renders a webpage to list all thumbnails stored in
  31 // TopSites, along with all associated URLs. The thumbnail images are embedded
  32 // into the HTML via Base64, so we can easily produce a dump of TopSites and
  33 // the thumbnails it stores.
  34 class ThumbnailListSource : public content::URLDataSource {
  35  public:
  36   explicit ThumbnailListSource(Profile* profile);
  37
  38   // content::URLDataSource implementation.
  39   std::string GetSource() const override;
  40   // Called on the IO thread.
  41   void StartDataRequest(
  42       const std::string& path,
  43       int render_process_id,
  44       int render_frame_id,
  45       const content::URLDataSource::GotDataCallback& callback) override;
  46
  47   std::string GetMimeType(const std::string& path) const override;
  48   base::MessageLoop* MessageLoopForRequestPath(
  49       const std::string& path) const override;
  50   bool ShouldServiceRequest(const net::URLRequest* request) const override;
  51   bool ShouldReplaceExistingSource() const override;
  52
  53  private:
  54   ~ThumbnailListSource() override;
  55
  56   // Called on the IO thread.
  57   void OnMostVisitedURLsAvailable(
  58     const content::URLDataSource::GotDataCallback& callback,
  59     const history::MostVisitedURLList& mvurl_list);
  60
  61   // ThumbnailService.
  62   scoped_refptr<thumbnails::ThumbnailService> thumbnail_service_;
  63
  64   scoped_refptr<history::TopSites> top_sites_;
  65
  66   // For callbacks may be run after destruction.
  67   base::WeakPtrFactory<ThumbnailListSource> weak_ptr_factory_;
  68
  69   DISALLOW_COPY_AND_ASSIGN(ThumbnailListSource);
  70 };
  71
  72
  73 #endif  // CHROME_BROWSER_THUMBNAILS_THUMBNAIL_LIST_SOURCE_H_