chrome/browser/ui/webui/ntp/new_tab_ui.h

   1 // Copyright (c) 2012 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_NEW_TAB_UI_H_
   6 #define CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_UI_H_
   7
   8 #include <string>
   9
  10 #include "base/gtest_prod_util.h"
  11 #include "base/prefs/pref_change_registrar.h"
  12 #include "base/time/time.h"
  13 #include "base/timer/timer.h"
  14 #include "content/public/browser/notification_observer.h"
  15 #include "content/public/browser/notification_registrar.h"
  16 #include "content/public/browser/url_data_source.h"
  17 #include "content/public/browser/web_contents.h"
  18 #include "content/public/browser/web_contents_observer.h"
  19 #include "content/public/browser/web_ui_controller.h"
  20
  21 class GURL;
  22 class Profile;
  23
  24 namespace base {
  25 class DictionaryValue;
  26 }
  27
  28 namespace user_prefs {
  29 class PrefRegistrySyncable;
  30 }
  31
  32 // The WebUIController used for the New Tab page.
  33 class NewTabUI : public content::WebUIController,
  34                  public content::WebContentsObserver,
  35                  public content::NotificationObserver {
  36  public:
  37   explicit NewTabUI(content::WebUI* web_ui);
  38   ~NewTabUI() override;
  39
  40   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
  41
  42   // Returns whether or not to show apps pages.
  43   static bool ShouldShowApps();
  44
  45   // Returns whether or not "Discovery" in the NTP is Enabled.
  46   static bool IsDiscoveryInNTPEnabled();
  47
  48   // Adds "url", "title", and "direction" keys on incoming dictionary, setting
  49   // title as the url as a fallback on empty title.
  50   static void SetUrlTitleAndDirection(base::DictionaryValue* dictionary,
  51                                       const base::string16& title,
  52                                       const GURL& gurl);
  53
  54   // Adds "full_name" and "full_name_direction" keys on incoming dictionary.
  55   static void SetFullNameAndDirection(const base::string16& full_name,
  56                                       base::DictionaryValue* dictionary);
  57
  58   // Returns a pointer to a NewTabUI if the WebUIController object is a new tab
  59   // page.
  60   static NewTabUI* FromWebUIController(content::WebUIController* ui);
  61
  62   // The current preference version.
  63   static int current_pref_version() { return current_pref_version_; }
  64
  65   // WebUIController implementation:
  66   void RenderViewCreated(content::RenderViewHost* render_view_host) override;
  67   void RenderViewReused(content::RenderViewHost* render_view_host) override;
  68
  69   // WebContentsObserver implementation:
  70   void WasHidden() override;
  71
  72   bool showing_sync_bubble() { return showing_sync_bubble_; }
  73   void set_showing_sync_bubble(bool showing) { showing_sync_bubble_ = showing; }
  74
  75   class NewTabHTMLSource : public content::URLDataSource {
  76    public:
  77     explicit NewTabHTMLSource(Profile* profile);
  78     ~NewTabHTMLSource() override;
  79
  80     // content::URLDataSource implementation.
  81     std::string GetSource() const override;
  82     void StartDataRequest(
  83         const std::string& path,
  84         int render_process_id,
  85         int render_frame_id,
  86         const content::URLDataSource::GotDataCallback& callback) override;
  87     std::string GetMimeType(const std::string&) const override;
  88     bool ShouldReplaceExistingSource() const override;
  89     bool ShouldAddContentSecurityPolicy() const override;
  90
  91     // Adds |resource| to the source. |resource_id| is resource id or 0,
  92     // which means return empty data set. |mime_type| is mime type of the
  93     // resource.
  94     void AddResource(const char* resource,
  95                      const char* mime_type,
  96                      int resource_id);
  97
  98    private:
  99     // Pointer back to the original profile.
 100     Profile* profile_;
 101
 102     // Maps resource files to mime types an resource ids.
 103     std::map<std::string, std::pair<std::string, int> > resource_map_;
 104
 105     DISALLOW_COPY_AND_ASSIGN(NewTabHTMLSource);
 106   };
 107
 108  private:
 109   FRIEND_TEST_ALL_PREFIXES(NewTabUITest, UpdateUserPrefsVersion);
 110
 111   // content::NotificationObserver implementation.
 112   void Observe(int type,
 113                const content::NotificationSource& source,
 114                const content::NotificationDetails& details) override;
 115
 116   // If |web_contents| has an NTP URL, emits a number of NTP statistics (like
 117   // mouseovers counts) associated with |web_contents|, to be logged in UMA
 118   // histograms.
 119   void EmitNtpStatistics();
 120
 121   void OnShowBookmarkBarChanged();
 122
 123   void StartTimingPaint(content::RenderViewHost* render_view_host);
 124   void PaintTimeout();
 125
 126   Profile* GetProfile() const;
 127
 128   content::NotificationRegistrar registrar_;
 129
 130   // The time when we started benchmarking.
 131   base::TimeTicks start_;
 132   // The last time we got a paint notification.
 133   base::TimeTicks last_paint_;
 134   // Scoping so we can be sure our timeouts don't outlive us.
 135   base::OneShotTimer<NewTabUI> timer_;
 136   // The preference version. This used for migrating prefs of the NTP.
 137   static const int current_pref_version_ = 3;
 138
 139   // If the sync promo NTP bubble is being shown.
 140   bool showing_sync_bubble_;
 141
 142   PrefChangeRegistrar pref_change_registrar_;
 143
 144   DISALLOW_COPY_AND_ASSIGN(NewTabUI);
 145 };
 146
 147 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_UI_H_