chrome/browser/ui/webui/chromeos/slow_ui.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/webui/chromeos/slow_ui.h"
   6
   7 #include <string>
   8
   9 #include "base/bind.h"
  10 #include "base/prefs/pref_change_registrar.h"
  11 #include "base/prefs/pref_service.h"
  12 #include "base/values.h"
  13 #include "chrome/browser/profiles/profile.h"
  14 #include "chrome/common/pref_names.h"
  15 #include "chrome/common/url_constants.h"
  16 #include "content/public/browser/web_contents.h"
  17 #include "content/public/browser/web_ui.h"
  18 #include "content/public/browser/web_ui_data_source.h"
  19 #include "content/public/browser/web_ui_message_handler.h"
  20 #include "grit/browser_resources.h"
  21 #include "grit/generated_resources.h"
  22 #include "ui/base/l10n/l10n_util.h"
  23 #include "ui/base/resource/resource_bundle.h"
  24 #include "ui/base/webui/jstemplate_builder.h"
  25 #include "ui/base/webui/web_ui_util.h"
  26
  27 using content::WebUIMessageHandler;
  28
  29 namespace {
  30
  31 // JS API callbacks names.
  32 const char kJsApiDisableTracing[] = "disableTracing";
  33 const char kJsApiEnableTracing[] = "enableTracing";
  34 const char kJsApiLoadComplete[] = "loadComplete";
  35
  36 // Page JS API function names.
  37 const char kJsApiTracingPrefChanged[] = "options.Slow.tracingPrefChanged";
  38
  39 }  // namespace
  40
  41 namespace chromeos {
  42
  43 content::WebUIDataSource* CreateSlowUIHTMLSource() {
  44   content::WebUIDataSource* source =
  45       content::WebUIDataSource::Create(chrome::kChromeUISlowHost);
  46
  47   source->SetUseJsonJSFormatV2();
  48   source->AddLocalizedString("slowDisable", IDS_SLOW_DISABLE);
  49   source->AddLocalizedString("slowEnable", IDS_SLOW_ENABLE);
  50   source->AddLocalizedString("slowDescription", IDS_SLOW_DESCRIPTION);
  51   source->AddLocalizedString("slowWarning", IDS_SLOW_WARNING);
  52
  53   source->SetJsonPath("strings.js");
  54   source->AddResourcePath("slow.js", IDR_SLOW_JS);
  55   source->SetDefaultResource(IDR_SLOW_HTML);
  56   return source;
  57 }
  58
  59 // The handler for Javascript messages related to the "slow" view.
  60 class SlowHandler : public WebUIMessageHandler {
  61  public:
  62   explicit SlowHandler(Profile* profile);
  63   virtual ~SlowHandler();
  64
  65   // WebUIMessageHandler implementation.
  66   virtual void RegisterMessages() OVERRIDE;
  67
  68  private:
  69   void UpdatePage();
  70
  71   // Handlers for JS WebUI messages.
  72   void HandleDisable(const base::ListValue* args);
  73   void HandleEnable(const base::ListValue* args);
  74   void LoadComplete(const base::ListValue* args);
  75
  76   Profile* profile_;
  77   scoped_ptr<PrefChangeRegistrar> user_pref_registrar_;
  78
  79   DISALLOW_COPY_AND_ASSIGN(SlowHandler);
  80 };
  81
  82 // SlowHandler ------------------------------------------------------------
  83
  84 SlowHandler::SlowHandler(Profile* profile) : profile_(profile) {
  85 }
  86
  87 SlowHandler::~SlowHandler() {
  88 }
  89
  90 void SlowHandler::RegisterMessages() {
  91   web_ui()->RegisterMessageCallback(kJsApiDisableTracing,
  92       base::Bind(&SlowHandler::HandleDisable, base::Unretained(this)));
  93   web_ui()->RegisterMessageCallback(kJsApiEnableTracing,
  94       base::Bind(&SlowHandler::HandleEnable, base::Unretained(this)));
  95   web_ui()->RegisterMessageCallback(kJsApiLoadComplete,
  96       base::Bind(&SlowHandler::LoadComplete, base::Unretained(this)));
  97
  98   user_pref_registrar_.reset(new PrefChangeRegistrar);
  99   user_pref_registrar_->Init(profile_->GetPrefs());
 100   user_pref_registrar_->Add(prefs::kPerformanceTracingEnabled,
 101                             base::Bind(&SlowHandler::UpdatePage,
 102                                        base::Unretained(this)));
 103 }
 104
 105 void SlowHandler::HandleDisable(const base::ListValue* args) {
 106   PrefService* pref_service = profile_->GetPrefs();
 107   pref_service->SetBoolean(prefs::kPerformanceTracingEnabled, false);
 108 }
 109
 110 void SlowHandler::HandleEnable(const base::ListValue* args) {
 111   PrefService* pref_service = profile_->GetPrefs();
 112   pref_service->SetBoolean(prefs::kPerformanceTracingEnabled, true);
 113 }
 114
 115 void SlowHandler::LoadComplete(const base::ListValue* args) {
 116   UpdatePage();
 117 }
 118
 119 void SlowHandler::UpdatePage() {
 120   PrefService* pref_service = profile_->GetPrefs();
 121   bool enabled = pref_service->GetBoolean(prefs::kPerformanceTracingEnabled);
 122   base::FundamentalValue pref_value(enabled);
 123   web_ui()->CallJavascriptFunction(kJsApiTracingPrefChanged, pref_value);
 124 }
 125
 126 // SlowUI -----------------------------------------------------------------
 127
 128 SlowUI::SlowUI(content::WebUI* web_ui) : WebUIController(web_ui) {
 129   Profile* profile = Profile::FromWebUI(web_ui);
 130
 131   SlowHandler* handler = new SlowHandler(profile);
 132   web_ui->AddMessageHandler(handler);
 133
 134   // Set up the chrome://slow/ source.
 135   content::WebUIDataSource::Add(profile, CreateSlowUIHTMLSource());
 136 }
 137
 138 }  // namespace chromeos
 139