chrome/browser/jumplist_win.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_JUMPLIST_WIN_H_
   6 #define CHROME_BROWSER_JUMPLIST_WIN_H_
   7
   8 #include <list>
   9 #include <string>
  10 #include <utility>
  11 #include <vector>
  12
  13 #include "base/files/file_path.h"
  14 #include "base/memory/weak_ptr.h"
  15 #include "base/synchronization/lock.h"
  16 #include "base/task/cancelable_task_tracker.h"
  17 #include "base/timer/timer.h"
  18 #include "chrome/browser/jumplist_updater_win.h"
  19 #include "chrome/browser/prefs/incognito_mode_prefs.h"
  20 #include "chrome/browser/sessions/tab_restore_service.h"
  21 #include "chrome/browser/sessions/tab_restore_service_observer.h"
  22 #include "components/history/core/browser/history_service.h"
  23 #include "components/history/core/browser/history_types.h"
  24 #include "components/history/core/browser/top_sites_observer.h"
  25 #include "content/public/browser/browser_thread.h"
  26 #include "content/public/browser/notification_observer.h"
  27 #include "content/public/browser/notification_registrar.h"
  28
  29 namespace chrome {
  30 struct FaviconImageResult;
  31 }
  32
  33 class PrefChangeRegistrar;
  34 class Profile;
  35
  36 // A class which implements an application JumpList.
  37 // This class encapsulates operations required for updating an application
  38 // JumpList:
  39 // * Retrieving "Most Visited" pages from HistoryService;
  40 // * Retrieving strings from the application resource;
  41 // * Adding COM objects to JumpList, etc.
  42 //
  43 // This class observes the tabs and policies of the given Profile and updates
  44 // the JumpList whenever a change is detected.
  45 //
  46 // Updating a JumpList requires some file operations and it is not good to
  47 // update it in a UI thread. To solve this problem, this class posts to a
  48 // runnable method when it actually updates a JumpList.
  49 //
  50 // Note. base::CancelableTaskTracker is not thread safe, so we
  51 // always delete JumpList on UI thread (the same thread it got constructed on).
  52 class JumpList : public TabRestoreServiceObserver,
  53                  public content::NotificationObserver,
  54                  public history::TopSitesObserver,
  55                  public base::RefCountedThreadSafe<
  56                      JumpList,
  57                      content::BrowserThread::DeleteOnUIThread> {
  58  public:
  59   explicit JumpList(Profile* profile);
  60
  61   // NotificationObserver implementation.
  62   void Observe(int type,
  63                const content::NotificationSource& source,
  64                const content::NotificationDetails& details) override;
  65
  66   // Observer callback for TabRestoreService::Observer to notify when a tab is
  67   // added or removed.
  68   void TabRestoreServiceChanged(TabRestoreService* service) override;
  69
  70   // Observer callback to notice when our associated TabRestoreService
  71   // is destroyed.
  72   void TabRestoreServiceDestroyed(TabRestoreService* service) override;
  73
  74   // Cancel a pending jumplist update.
  75   void CancelPendingUpdate();
  76
  77   // Terminate the jumplist: cancel any pending updates and stop observing
  78   // the Profile and its services. This must be called before the |profile_|
  79   // is destroyed.
  80   void Terminate();
  81
  82   // Returns true if the custom JumpList is enabled.
  83   // The custom jumplist works only on Windows 7 and above.
  84   static bool Enabled();
  85
  86  private:
  87   friend struct content::BrowserThread::DeleteOnThread<
  88       content::BrowserThread::UI>;
  89   friend class base::DeleteHelper<JumpList>;
  90   ~JumpList() override;
  91
  92   // Creates a ShellLinkItem object from a tab (or a window) and add it to the
  93   // given list.
  94   // These functions are copied from the RecentlyClosedTabsHandler class for
  95   // compatibility with the new-tab page.
  96   bool AddTab(const TabRestoreService::Tab* tab,
  97               ShellLinkItemList* list,
  98               size_t max_items);
  99   void AddWindow(const TabRestoreService::Window* window,
 100                  ShellLinkItemList* list,
 101                  size_t max_items);
 102
 103   // Starts loading a favicon for each URL in |icon_urls_|.
 104   // This function sends a query to HistoryService.
 105   // When finishing loading all favicons, this function posts a task that
 106   // decompresses collected favicons and updates a JumpList.
 107   void StartLoadingFavicon();
 108
 109   // A callback function for HistoryService that notify when a requested favicon
 110   // is available.
 111   // To avoid file operations, this function just attaches the given data to
 112   // a ShellLinkItem object.
 113   void OnFaviconDataAvailable(
 114       const favicon_base::FaviconImageResult& image_result);
 115
 116   // Callback for TopSites that notifies when the "Most
 117   // Visited" list is available. This function updates the ShellLinkItemList
 118   // objects and send another query that retrieves a favicon for each URL in
 119   // the list.
 120   void OnMostVisitedURLsAvailable(
 121       const history::MostVisitedURLList& data);
 122
 123   // Callback for changes to the incognito mode availability pref.
 124   void OnIncognitoAvailabilityChanged();
 125
 126   // Helper for RunUpdate() that determines its parameters.
 127   void PostRunUpdate();
 128
 129   // Called on a timer to invoke RunUpdateOnFileThread() after requests storms
 130   // have subsided.
 131   void DeferredRunUpdate();
 132
 133   // Runnable method that updates the jumplist, once all the data
 134   // has been fetched.
 135   void RunUpdateOnFileThread(
 136       IncognitoModePrefs::Availability incognito_availability);
 137
 138   // Helper method for RunUpdate to create icon files for the asynchrounously
 139   // loaded icons.
 140   void CreateIconFiles(const ShellLinkItemList& item_list);
 141
 142   // history::TopSitesObserver implementation.
 143   void TopSitesLoaded(history::TopSites* top_sites) override;
 144   void TopSitesChanged(history::TopSites* top_sites,
 145                        ChangeReason change_reason) override;
 146
 147   // Tracks FaviconService tasks.
 148   base::CancelableTaskTracker cancelable_task_tracker_;
 149
 150   // The Profile object is used to listen for events
 151   Profile* profile_;
 152
 153   // Lives on the UI thread.
 154   scoped_ptr<content::NotificationRegistrar> registrar_;
 155   scoped_ptr<PrefChangeRegistrar> pref_change_registrar_;
 156
 157   // App id to associate with the jump list.
 158   std::wstring app_id_;
 159
 160   // The directory which contains JumpList icons.
 161   base::FilePath icon_dir_;
 162
 163   // Items in the "Most Visited" category of the application JumpList,
 164   // protected by the list_lock_.
 165   ShellLinkItemList most_visited_pages_;
 166
 167   // Items in the "Recently Closed" category of the application JumpList,
 168   // protected by the list_lock_.
 169   ShellLinkItemList recently_closed_pages_;
 170
 171   // Timer for requesting delayed updates of the jumplist.
 172   base::OneShotTimer<JumpList> timer_;
 173
 174   // A list of URLs we need to retrieve their favicons,
 175   // protected by the list_lock_.
 176   typedef std::pair<std::string, scoped_refptr<ShellLinkItem> > URLPair;
 177   std::list<URLPair> icon_urls_;
 178
 179   // Id of last favicon task. It's used to cancel current task if a new one
 180   // comes in before it finishes.
 181   base::CancelableTaskTracker::TaskId task_id_;
 182
 183   // Lock for most_visited_pages_, recently_closed_pages_, icon_urls_
 184   // as they may be used by up to 3 threads.
 185   base::Lock list_lock_;
 186
 187   // For callbacks may be run after destruction.
 188   base::WeakPtrFactory<JumpList> weak_ptr_factory_;
 189
 190   DISALLOW_COPY_AND_ASSIGN(JumpList);
 191 };
 192
 193 #endif  // CHROME_BROWSER_JUMPLIST_WIN_H_