Allow AppSearchProvider to provide recommendations.

chrome/browser/ui/app_list/search/app_search_provider.cc

 // Copyright 2013 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 "chrome/browser/ui/app_list/search/app_search_provider.h"
 
 #include <string>
 
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_ui_util.h"
 #include "chrome/browser/extensions/extension_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/app_list/search/app_result.h"
 #include "chrome/browser/ui/app_list/search/tokenized_string.h"
 #include "chrome/browser/ui/app_list/search/tokenized_string_match.h"
+#include "extensions/browser/extension_prefs.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_set.h"
 
 using extensions::ExtensionRegistry;
 
 namespace app_list {
 
 class AppSearchProvider::App {
  public:
-  explicit App(const extensions::Extension* extension)
+  explicit App(const extensions::Extension* extension,
+               const base::Time& last_launch_time)
       : app_id_(extension->id()),
-        indexed_name_(base::UTF8ToUTF16(extension->name())) {
-  }
+        indexed_name_(base::UTF8ToUTF16(extension->name())),
+        last_launch_time_(last_launch_time) {}
   ~App() {}
 
   const std::string& app_id() const { return app_id_; }
   const TokenizedString& indexed_name() const { return indexed_name_; }
+  const base::Time& last_launch_time() const { return last_launch_time_; }
+
+  static bool AppLaunchedMoreRecent(App* const app1, App* const app2) {
+    return app1->last_launch_time() > app2->last_launch_time();
+  }
 
  private:
   const std::string app_id_;
   TokenizedString indexed_name_;
+  base::Time last_launch_time_;
 
   DISALLOW_COPY_AND_ASSIGN(App);
 };
 
 AppSearchProvider::AppSearchProvider(Profile* profile,
                                      AppListControllerDelegate* list_controller)
     : profile_(profile),
       list_controller_(list_controller),
       extension_registry_observer_(this) {
   extension_registry_observer_.Add(ExtensionRegistry::Get(profile_));
   RefreshApps();
 }
 
 AppSearchProvider::~AppSearchProvider() {}
 
+void AppSearchProvider::FetchRecommendations() {
+  ClearResults();
+
+  // Reload apps to ensure we have the latest launch time information.

[Matt Giuca, 2014/07/22 04:31:07]

nit: Don't use the word "reload"; it implies you are actually going to simulate
clicking the "Reload" button on all the apps (which we certainly don't want
every time we type a letter).

s/Reload/Refresh list of/

[calamity, 2014/07/22 07:24:04]

Done.

+  RefreshApps();
+
+  for (Apps::const_iterator app_it = apps_.begin(); app_it != apps_.end();
+       ++app_it) {
+    scoped_ptr<AppResult> result(
+        new AppResult(profile_, (*app_it)->app_id(), list_controller_));
+    result->set_title((*app_it)->indexed_name().text());
+    result->UpdateFromLastLaunched((*app_it)->last_launch_time());
+    Add(result.PassAs<SearchResult>());
+  }
+}
+
 void AppSearchProvider::Start(const base::string16& query) {
   const TokenizedString query_terms(query);
 
   ClearResults();
 
   TokenizedStringMatch match;
   for (Apps::const_iterator app_it = apps_.begin();
        app_it != apps_.end();
        ++app_it) {
     if (!match.Calculate(query_terms, (*app_it)->indexed_name()))
       continue;
 
     scoped_ptr<AppResult> result(
         new AppResult(profile_, (*app_it)->app_id(), list_controller_));
     result->UpdateFromMatch((*app_it)->indexed_name(), match);
     Add(result.PassAs<SearchResult>());
   }
 }
 
 void AppSearchProvider::Stop() {}
 
 void AppSearchProvider::AddApps(const extensions::ExtensionSet& extensions) {
+  extensions::ExtensionPrefs* prefs = extensions::ExtensionPrefs::Get(profile_);
   for (extensions::ExtensionSet::const_iterator iter = extensions.begin();
        iter != extensions.end(); ++iter) {
     const extensions::Extension* app = iter->get();
 
     if (!extensions::ui_util::ShouldDisplayInAppLauncher(app, profile_))
       continue;
 
     if (profile_->IsOffTheRecord() &&
         !extensions::util::CanLoadInIncognito(app, profile_))
       continue;
-    apps_.push_back(new App(app));
+
+    apps_.push_back(new App(app, prefs->GetLastLaunchTime(app->id())));
   }
 }
 
 void AppSearchProvider::RefreshApps() {
   apps_.clear();
   ExtensionRegistry* registry = ExtensionRegistry::Get(profile_);
   AddApps(registry->enabled_extensions());
   AddApps(registry->disabled_extensions());
   AddApps(registry->terminated_extensions());
+  std::sort(apps_.begin(), apps_.end(), &App::AppLaunchedMoreRecent);
 }
 
 void AppSearchProvider::OnExtensionLoaded(
     content::BrowserContext* browser_context,
     const extensions::Extension* extension) {
   RefreshApps();
 }
 
 void AppSearchProvider::OnExtensionUninstalled(
     content::BrowserContext* browser_context,
     const extensions::Extension* extension) {
   RefreshApps();
 }
 
 }  // namespace app_list