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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <list>
#include <string>
#include <utility>
#include <vector>
#include "base/files/file_path.h"
#include "base/memory/weak_ptr.h"
#include "base/synchronization/lock.h"
#include "base/task/cancelable_task_tracker.h"
#include "chrome/browser/history/history_service.h"
#include "chrome/browser/history/history_types.h"
#include "chrome/browser/jumplist_updater_win.h"
#include "chrome/browser/sessions/tab_restore_service.h"
#include "chrome/browser/sessions/tab_restore_service_observer.h"
#include "content/public/browser/browser_thread.h"
namespace chrome {
struct FaviconImageResult;
namespace content {
class NotificationRegistrar;
class Profile;
class PageUsageData;
// A class which implements an application JumpList.
// This class encapsulates operations required for updating an application
// JumpList:
// * Retrieving "Most Visited" pages from HistoryService;
// * Retrieving strings from the application resource;
// * Creatng COM objects used by JumpList from PageUsageData objects;
// * Adding COM objects to JumpList, etc.
// This class also implements TabRestoreServiceObserver. So, once we call
// AddObserver() and register this class as an observer, it automatically
// updates a JumpList when a tab is added or removed.
// Updating a JumpList requires some file operations and it is not good to
// update it in a UI thread. To solve this problem, this class posts to a
// runnable method when it actually updates a JumpList.
// Note. base::CancelableTaskTracker is not thread safe, so we
// always delete JumpList on UI thread (the same thread it got constructed on).
class JumpList : public TabRestoreServiceObserver,
public content::NotificationObserver,
public base::RefCountedThreadSafe<
JumpList, content::BrowserThread::DeleteOnUIThread> {
// NotificationObserver implementation.
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details);
// Registers (or unregisters) this object as an observer.
// When the TabRestoreService object notifies the tab status is changed, this
// class automatically updates an application JumpList.
bool AddObserver(Profile* profile);
void RemoveObserver();
// Observer callback for TabRestoreService::Observer to notify when a tab is
// added or removed.
// This function sends a query that retrieves "Most Visited" pages to
// HistoryService. When the query finishes successfully, HistoryService call
// OnSegmentUsageAvailable().
virtual void TabRestoreServiceChanged(TabRestoreService* service);
// Observer callback to notice when our associated TabRestoreService
// is destroyed.
virtual void TabRestoreServiceDestroyed(TabRestoreService* service);
// Cancel a pending jumplist update.
void CancelPendingUpdate();
// Terminate the jumplist: cancel any pending updates and remove observer
// from TabRestoreService. This must be called before the profile provided
// in the AddObserver method is destroyed.
void Terminate();
// Returns true if the custom JumpList is enabled.
// The custom jumplist works only on Windows 7 and above.
static bool Enabled();
// Creates a ShellLinkItem object from a tab (or a window) and add it to the
// given list.
// These functions are copied from the RecentlyClosedTabsHandler class for
// compatibility with the new-tab page.
bool AddTab(const TabRestoreService::Tab* tab,
ShellLinkItemList* list,
size_t max_items);
void AddWindow(const TabRestoreService::Window* window,
ShellLinkItemList* list,
size_t max_items);
// Starts loading a favicon for each URL in |icon_urls_|.
// This function sends a query to HistoryService.
// When finishing loading all favicons, this function posts a task that
// decompresses collected favicons and updates a JumpList.
void StartLoadingFavicon();
// A callback function for HistoryService that notify when the "Most Visited"
// list is available.
// This function updates the ShellLinkItemList objects and send another query
// that retrieves a favicon for each URL in the list.
void OnSegmentUsageAvailable(CancelableRequestProvider::Handle handle,
std::vector<PageUsageData*>* data);
// A callback function for HistoryService that notify when a requested favicon
// is available.
// To avoid file operations, this function just attaches the given data to
// a ShellLinkItem object.
void OnFaviconDataAvailable(
const favicon_base::FaviconImageResult& image_result);
// Callback for TopSites that notifies when the "Most
// Visited" list is available. This function updates the ShellLinkItemList
// objects and send another query that retrieves a favicon for each URL in
// the list.
void OnMostVisitedURLsAvailable(
const history::MostVisitedURLList& data);
// Runnable method that updates the jumplist, once all the data
// has been fetched.
void RunUpdate();
// Helper method for RunUpdate to create icon files for the asynchrounously
// loaded icons.
void CreateIconFiles(const ShellLinkItemList& item_list);
friend struct content::BrowserThread::DeleteOnThread<
friend class base::DeleteHelper<JumpList>;
// For callbacks may be run after destruction.
base::WeakPtrFactory<JumpList> weak_ptr_factory_;
// Tracks FaviconService tasks.
base::CancelableTaskTracker cancelable_task_tracker_;
// The Profile object is used to listen for events
Profile* profile_;
// Lives on the UI thread.
scoped_ptr<content::NotificationRegistrar> registrar_;
// App id to associate with the jump list.
std::wstring app_id_;
// The directory which contains JumpList icons.
base::FilePath icon_dir_;
// Items in the "Most Visited" category of the application JumpList,
// protected by the list_lock_.
ShellLinkItemList most_visited_pages_;
// Items in the "Recently Closed" category of the application JumpList,
// protected by the list_lock_.
ShellLinkItemList recently_closed_pages_;
// A list of URLs we need to retrieve their favicons,
// protected by the list_lock_.
typedef std::pair<std::string, scoped_refptr<ShellLinkItem> > URLPair;
std::list<URLPair> icon_urls_;
// Id of last favicon task. It's used to cancel current task if a new one
// comes in before it finishes.
base::CancelableTaskTracker::TaskId task_id_;
// Lock for most_visited_pages_, recently_closed_pages_, icon_urls_
// as they may be used by up to 3 threads.
base::Lock list_lock_;