recommended_apps.cc revision a1401311d1ab56c4ed0a474bd38c108f75cb0cd9 
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
22namespace app_list {
23
24namespace {
25
26struct 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
36bool AppLaunchedMoreRecent(const AppSortInfo& app1, const AppSortInfo& app2) {
37  return app1.last_launch_time > app2.last_launch_time;
38}
39
40}  // namespace
41
42RecommendedApps::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
54RecommendedApps::~RecommendedApps() {
55  extensions::InstallTrackerFactory::GetForProfile(profile_)
56      ->RemoveObserver(this);
57}
58
59void RecommendedApps::AddObserver(RecommendedAppsObserver* observer) {
60  observers_.AddObserver(observer);
61}
62
63void RecommendedApps::RemoveObserver(RecommendedAppsObserver* observer) {
64  observers_.RemoveObserver(observer);
65}
66
67void 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
101void RecommendedApps::OnExtensionInstalled(
102    const extensions::Extension* extension) {
103  Update();
104}
105
106void RecommendedApps::OnExtensionLoaded(
107    const extensions::Extension* extension) {
108  Update();
109}
110
111void RecommendedApps::OnExtensionUnloaded(
112    const extensions::Extension* extension) {
113  Update();
114}
115
116void RecommendedApps::OnExtensionUninstalled(
117    const extensions::Extension* extension) {
118  Update();
119}
120
121}  // namespace app_list
122