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      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 #ifndef CHROME_BROWSER_UI_WEBUI_NTP_ANDROID_NAVIGATION_HANDLER_H_
      6 #define CHROME_BROWSER_UI_WEBUI_NTP_ANDROID_NAVIGATION_HANDLER_H_
      7 
      8 #include "base/compiler_specific.h"
      9 #include "content/public/browser/web_ui_message_handler.h"
     10 
     11 namespace base {
     12 class ListValue;
     13 }
     14 
     15 // Records a UMA stat ("NewTabPage.ActionAndroid") for the action the user takes
     16 // to navigate away from the NTP.
     17 class NavigationHandler : public content::WebUIMessageHandler {
     18  public:
     19   NavigationHandler();
     20   virtual ~NavigationHandler();
     21 
     22   // WebUIMessageHandler implementation.
     23   virtual void RegisterMessages() OVERRIDE;
     24 
     25   // Callback for "openedMostVisited".
     26   void HandleOpenedMostVisited(const base::ListValue* args);
     27 
     28   // Callback for "openedRecentlyClosed".
     29   void HandleOpenedRecentlyClosed(const base::ListValue* args);
     30 
     31   // Callback for "openedBookmark".
     32   void HandleOpenedBookmark(const base::ListValue* args);
     33 
     34   // Callback for "openedForeignSession".
     35   void HandleOpenedForeignSession(const base::ListValue* args);
     36 
     37  private:
     38   // Possible actions taken by the user on the NTP. This enum is also defined in
     39   // histograms.xml. WARNING: these values must stay in sync with histograms.xml
     40   // and new actions can be added only at the end of the enum.
     41   enum Action {
     42     // User performed a search using the omnibox
     43     ACTION_SEARCHED_USING_OMNIBOX = 0,
     44     // User navigated to Google search homepage using the omnibox
     45     ACTION_NAVIGATED_TO_GOOGLE_HOMEPAGE = 1,
     46     // User navigated to any other page using the omnibox
     47     ACTION_NAVIGATED_USING_OMNIBOX = 2,
     48     // User opened a most visited page
     49     ACTION_OPENED_MOST_VISITED_ENTRY = 3,
     50     // User opened a recently closed tab
     51     ACTION_OPENED_RECENTLY_CLOSED_ENTRY = 4,
     52     // User opened a bookmark
     53     ACTION_OPENED_BOOKMARK = 5,
     54     // User opened a foreign session (from other devices section)
     55     ACTION_OPENED_FOREIGN_SESSION = 6,
     56     // The number of possible actions
     57     NUM_ACTIONS = 7
     58   };
     59 
     60   void RecordAction(Action action);
     61 
     62   DISALLOW_COPY_AND_ASSIGN(NavigationHandler);
     63 };
     64 
     65 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_ANDROID_NAVIGATION_HANDLER_H_
     66