src/chrome/browser/ui/app_list/recommended_apps.cc

   1 // Copyright 2013 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 #include "chrome/browser/ui/app_list/recommended_apps.h"
   6
   7 #include <algorithm>
   8 #include <vector>
   9
  10 #include "base/bind.h"
  11 #include "chrome/browser/extensions/install_tracker.h"
  12 #include "chrome/browser/extensions/install_tracker_factory.h"
  13 #include "chrome/browser/profiles/profile.h"
  14 #include "chrome/browser/ui/app_list/recommended_apps_observer.h"
  15 #include "chrome/common/pref_names.h"
  16 #include "extensions/browser/extension_prefs.h"
  17 #include "extensions/browser/extension_registry.h"
  18 #include "extensions/browser/pref_names.h"
  19 #include "extensions/common/extension.h"
  20 #include "extensions/common/extension_set.h"
  21
  22 namespace app_list {
  23
  24 namespace {
  25
  26 struct AppSortInfo {
  27   AppSortInfo() : app(NULL) {}
  28   AppSortInfo(const extensions::Extension* app,
  29               const base::Time& last_launch_time)
  30       : app(app), last_launch_time(last_launch_time) {}
  31
  32   const extensions::Extension* app;
  33   base::Time last_launch_time;
  34 };
  35
  36 bool AppLaunchedMoreRecent(const AppSortInfo& app1, const AppSortInfo& app2) {
  37   return app1.last_launch_time > app2.last_launch_time;
  38 }
  39
  40 }  // namespace
  41
  42 RecommendedApps::RecommendedApps(Profile* profile) : profile_(profile) {
  43   extensions::InstallTrackerFactory::GetForProfile(profile_)->AddObserver(this);
  44
  45   extensions::ExtensionPrefs* prefs = extensions::ExtensionPrefs::Get(profile_);
  46   pref_change_registrar_.Init(prefs->pref_service());
  47   pref_change_registrar_.Add(extensions::pref_names::kExtensions,
  48                              base::Bind(&RecommendedApps::Update,
  49                                         base::Unretained(this)));
  50
  51   Update();
  52 }
  53
  54 RecommendedApps::~RecommendedApps() {
  55   extensions::InstallTrackerFactory::GetForProfile(profile_)
  56       ->RemoveObserver(this);
  57 }
  58
  59 void RecommendedApps::AddObserver(RecommendedAppsObserver* observer) {
  60   observers_.AddObserver(observer);
  61 }
  62
  63 void RecommendedApps::RemoveObserver(RecommendedAppsObserver* observer) {
  64   observers_.RemoveObserver(observer);
  65 }
  66
  67 void RecommendedApps::Update() {
  68   extensions::ExtensionPrefs* prefs = extensions::ExtensionPrefs::Get(profile_);
  69
  70   std::vector<AppSortInfo> sorted_apps;
  71   const extensions::ExtensionSet& extensions =
  72       extensions::ExtensionRegistry::Get(profile_)->enabled_extensions();
  73   for (extensions::ExtensionSet::const_iterator app = extensions.begin();
  74        app != extensions.end();
  75        ++app) {
  76     if (!(*app)->ShouldDisplayInAppLauncher())
  77       continue;
  78
  79     sorted_apps.push_back(
  80         AppSortInfo(app->get(), prefs->GetLastLaunchTime((*app)->id())));
  81   }
  82
  83   std::sort(sorted_apps.begin(), sorted_apps.end(), &AppLaunchedMoreRecent);
  84
  85   const size_t kMaxRecommendedApps = 4;
  86   sorted_apps.resize(std::min(kMaxRecommendedApps, sorted_apps.size()));
  87
  88   Apps new_recommends;
  89   for (size_t i = 0; i < sorted_apps.size(); ++i)
  90     new_recommends.push_back(sorted_apps[i].app);
  91
  92   const bool changed = apps_.size() != new_recommends.size() ||
  93       !std::equal(apps_.begin(), apps_.end(), new_recommends.begin());
  94   if (changed) {
  95     apps_.swap(new_recommends);
  96     FOR_EACH_OBSERVER(
  97         RecommendedAppsObserver, observers_, OnRecommendedAppsChanged());
  98   }
  99 }
 100
 101 void RecommendedApps::OnExtensionInstalled(
 102     const extensions::Extension* extension) {
 103   Update();
 104 }
 105
 106 void RecommendedApps::OnExtensionLoaded(
 107     const extensions::Extension* extension) {
 108   Update();
 109 }
 110
 111 void RecommendedApps::OnExtensionUnloaded(
 112     const extensions::Extension* extension) {
 113   Update();
 114 }
 115
 116 void RecommendedApps::OnExtensionUninstalled(
 117     const extensions::Extension* extension) {
 118   Update();
 119 }
 120
 121 }  // namespace app_list