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 "chrome/browser/common/cancelable_request.h"
  12 #include "chrome/browser/history/history_types.h"
  13 #include "chrome/browser/history/visit_filter.h"
  14 #include "chrome/browser/ui/webui/ntp/suggestions_source.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   virtual ~SuggestionsSourceTopSites();
  29
  30  protected:
  31   // SuggestionsSource overrides:
  32   virtual void SetDebug(bool enable) OVERRIDE;
  33   virtual int GetWeight() OVERRIDE;
  34   virtual int GetItemCount() OVERRIDE;
  35   virtual base::DictionaryValue* PopItem() OVERRIDE;
  36   virtual void FetchItems(Profile* profile) OVERRIDE;
  37   virtual void SetCombiner(SuggestionsCombiner* combiner) OVERRIDE;
  38
  39   void OnSuggestionsUrlsAvailable(
  40       CancelableRequestProvider::Handle handle,
  41       const history::FilteredURLList& data);
  42
  43  private:
  44
  45   // Gets the sorting order from the command-line arguments. Defaults to
  46   // |ORDER_BY_RECENCY| if there are no command-line argument specifying a
  47   // sorting order.
  48   static history::VisitFilter::SortingOrder GetSortingOrder();
  49
  50   // Gets the filter width from the command-line arguments. Defaults to one
  51   // hour if there are no command-line argument setting the filter width.
  52   static base::TimeDelta GetFilterWidth();
  53
  54   // Our combiner.
  55   SuggestionsCombiner* combiner_;
  56
  57   // Keep the results of the db query here.
  58   std::deque<base::DictionaryValue*> items_;
  59
  60   // Whether the source should provide additional debug information or not.
  61   bool debug_;
  62
  63   CancelableRequestConsumer history_consumer_;
  64
  65   DISALLOW_COPY_AND_ASSIGN(SuggestionsSourceTopSites);
  66 };
  67
  68 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_SUGGESTIONS_SOURCE_TOP_SITES_H_