chrome/browser/ui/webui/ntp/suggestions_source_top_sites.h

   1 // Copyright (c) 2012 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_NTP_SUGGESTIONS_SOURCE_TOP_SITES_H_
   6 #define CHROME_BROWSER_UI_WEBUI_NTP_SUGGESTIONS_SOURCE_TOP_SITES_H_
   7
   8 #include <deque>
   9
  10 #include "base/basictypes.h"
  11 #include "base/task/cancelable_task_tracker.h"
  12 #include "chrome/browser/ui/webui/ntp/suggestions_source.h"
  13 #include "components/history/core/browser/history_types.h"
  14 #include "components/history/core/browser/visit_filter.h"
  15
  16 class SuggestionsCombiner;
  17 class Profile;
  18
  19 namespace base {
  20 class DictionaryValue;
  21 }
  22
  23 // A SuggestionsSource that uses the local TopSites database to provide
  24 // suggestions.
  25 class SuggestionsSourceTopSites : public SuggestionsSource {
  26  public:
  27   SuggestionsSourceTopSites();
  28   ~SuggestionsSourceTopSites() override;
  29
  30  protected:
  31   // SuggestionsSource overrides:
  32   void SetDebug(bool enable) override;
  33   int GetWeight() override;
  34   int GetItemCount() override;
  35   base::DictionaryValue* PopItem() override;
  36   void FetchItems(Profile* profile) override;
  37   void SetCombiner(SuggestionsCombiner* combiner) override;
  38
  39   void OnSuggestionsUrlsAvailable(const history::FilteredURLList* data);
  40
  41  private:
  42
  43   // Gets the sorting order from the command-line arguments. Defaults to
  44   // |ORDER_BY_RECENCY| if there are no command-line argument specifying a
  45   // sorting order.
  46   static history::VisitFilter::SortingOrder GetSortingOrder();
  47
  48   // Gets the filter width from the command-line arguments. Defaults to one
  49   // hour if there are no command-line argument setting the filter width.
  50   static base::TimeDelta GetFilterWidth();
  51
  52   // Our combiner.
  53   SuggestionsCombiner* combiner_;
  54
  55   // Keep the results of the db query here.
  56   std::deque<base::DictionaryValue*> items_;
  57
  58   // Whether the source should provide additional debug information or not.
  59   bool debug_;
  60
  61   base::CancelableTaskTracker history_tracker_;
  62
  63   DISALLOW_COPY_AND_ASSIGN(SuggestionsSourceTopSites);
  64 };
  65
  66 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_SUGGESTIONS_SOURCE_TOP_SITES_H_