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