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 "chrome/browser/history/history_service.h"
  18 #include "chrome/browser/history/history_types.h"
  19 #include "chrome/browser/jumplist_updater_win.h"
  20 #include "chrome/browser/sessions/tab_restore_service.h"
  21 #include "chrome/browser/sessions/tab_restore_service_observer.h"
  22 #include "content/public/browser/browser_thread.h"
  23
  24 namespace chrome {
  25 struct FaviconImageResult;
  26 }
  27
  28 namespace content {
  29 class NotificationRegistrar;
  30 }
  31
  32 class Profile;
  33 class PageUsageData;
  34
  35 // A class which implements an application JumpList.
  36 // This class encapsulates operations required for updating an application
  37 // JumpList:
  38 // * Retrieving "Most Visited" pages from HistoryService;
  39 // * Retrieving strings from the application resource;
  40 // * Creatng COM objects used by JumpList from PageUsageData objects;
  41 // * Adding COM objects to JumpList, etc.
  42 //
  43 // This class also implements TabRestoreServiceObserver. So, once we call
  44 // AddObserver() and register this class as an observer, it automatically
  45 // updates a JumpList when a tab is added or removed.
  46 //
  47 // Updating a JumpList requires some file operations and it is not good to
  48 // update it in a UI thread. To solve this problem, this class posts to a
  49 // runnable method when it actually updates a JumpList.
  50 //
  51 // Note. base::CancelableTaskTracker is not thread safe, so we
  52 // always delete JumpList on UI thread (the same thread it got constructed on).
  53 class JumpList : public TabRestoreServiceObserver,
  54                  public content::NotificationObserver,
  55                  public base::RefCountedThreadSafe<
  56                      JumpList, content::BrowserThread::DeleteOnUIThread> {
  57  public:
  58   JumpList();
  59
  60   // NotificationObserver implementation.
  61   virtual void Observe(int type,
  62                        const content::NotificationSource& source,
  63                        const content::NotificationDetails& details);
  64
  65   // Registers (or unregisters) this object as an observer.
  66   // When the TabRestoreService object notifies the tab status is changed, this
  67   // class automatically updates an application JumpList.
  68   bool AddObserver(Profile* profile);
  69   void RemoveObserver();
  70
  71   // Observer callback for TabRestoreService::Observer to notify when a tab is
  72   // added or removed.
  73   virtual void TabRestoreServiceChanged(TabRestoreService* service);
  74
  75   // Observer callback to notice when our associated TabRestoreService
  76   // is destroyed.
  77   virtual void TabRestoreServiceDestroyed(TabRestoreService* service);
  78
  79   // Cancel a pending jumplist update.
  80   void CancelPendingUpdate();
  81
  82   // Terminate the jumplist: cancel any pending updates and remove observer
  83   // from TabRestoreService. This must be called before the profile provided
  84   // in the AddObserver method is destroyed.
  85   void Terminate();
  86
  87   // Returns true if the custom JumpList is enabled.
  88   // The custom jumplist works only on Windows 7 and above.
  89   static bool Enabled();
  90
  91  protected:
  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   // Runnable method that updates the jumplist, once all the data
 124   // has been fetched.
 125   void RunUpdate();
 126
 127   // Helper method for RunUpdate to create icon files for the asynchrounously
 128   // loaded icons.
 129   void CreateIconFiles(const ShellLinkItemList& item_list);
 130
 131  private:
 132   friend struct content::BrowserThread::DeleteOnThread<
 133       content::BrowserThread::UI>;
 134   friend class base::DeleteHelper<JumpList>;
 135   ~JumpList();
 136
 137   // For callbacks may be run after destruction.
 138   base::WeakPtrFactory<JumpList> weak_ptr_factory_;
 139
 140   // Tracks FaviconService tasks.
 141   base::CancelableTaskTracker cancelable_task_tracker_;
 142
 143   // The Profile object is used to listen for events
 144   Profile* profile_;
 145
 146   // Lives on the UI thread.
 147   scoped_ptr<content::NotificationRegistrar> registrar_;
 148
 149   // App id to associate with the jump list.
 150   std::wstring app_id_;
 151
 152   // The directory which contains JumpList icons.
 153   base::FilePath icon_dir_;
 154
 155   // Items in the "Most Visited" category of the application JumpList,
 156   // protected by the list_lock_.
 157   ShellLinkItemList most_visited_pages_;
 158
 159   // Items in the "Recently Closed" category of the application JumpList,
 160   // protected by the list_lock_.
 161   ShellLinkItemList recently_closed_pages_;
 162
 163   // A list of URLs we need to retrieve their favicons,
 164   // protected by the list_lock_.
 165   typedef std::pair<std::string, scoped_refptr<ShellLinkItem> > URLPair;
 166   std::list<URLPair> icon_urls_;
 167
 168   // Id of last favicon task. It's used to cancel current task if a new one
 169   // comes in before it finishes.
 170   base::CancelableTaskTracker::TaskId task_id_;
 171
 172   // Lock for most_visited_pages_, recently_closed_pages_, icon_urls_
 173   // as they may be used by up to 3 threads.
 174   base::Lock list_lock_;
 175
 176   DISALLOW_COPY_AND_ASSIGN(JumpList);
 177 };
 178
 179 #endif  // CHROME_BROWSER_JUMPLIST_WIN_H_