chrome/browser/ui/webui/chromeos/salsa_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/salsa_ui.h"
   6
   7 #include "base/bind.h"
   8 #include "base/memory/scoped_ptr.h"
   9 #include "base/prefs/pref_service.h"
  10 #include "base/values.h"
  11 #include "chrome/browser/browser_process.h"
  12 #include "chrome/browser/profiles/profile.h"
  13 #include "chrome/common/pref_names.h"
  14 #include "chrome/common/url_constants.h"
  15 #include "content/public/browser/browser_thread.h"
  16 #include "content/public/browser/web_ui.h"
  17 #include "content/public/browser/web_ui_data_source.h"
  18 #include "grit/browser_resources.h"
  19
  20 // Whitelist of which preferences are possible targets for Salsa treatments.
  21 // If new preferences are added and they are to be used in an experiment, then
  22 // they must be added to this list as well to keep chrome://salsa from
  23 // changing arbitrary values.
  24
  25 namespace {
  26
  27 const char* kWhitelist[] = {
  28   prefs::kFlingMaxCancelToDownTimeInMs,
  29   prefs::kFlingMaxTapGapTimeInMs,
  30   prefs::kLongPressTimeInSeconds,
  31   prefs::kLongPressTimeInSeconds,
  32   prefs::kMaxSecondsBetweenDoubleClick,
  33   prefs::kMaxSeparationForGestureTouchesInPixels,
  34   prefs::kMaxSwipeDeviationRatio,
  35   prefs::kMaxTouchDownDurationInSecondsForClick,
  36   prefs::kMaxTouchMoveInPixelsForClick,
  37   prefs::kMaxDistanceBetweenTapsForDoubleTap,
  38   prefs::kMaxDistanceForTwoFingerTapInPixels,
  39   prefs::kMinDistanceForPinchScrollInPixels,
  40   prefs::kMinFlickSpeedSquared,
  41   prefs::kMinPinchUpdateDistanceInPixels,
  42   prefs::kMinRailBreakVelocity,
  43   prefs::kMinScrollDeltaSquared,
  44   prefs::kMinSwipeSpeed,
  45   prefs::kMinTouchDownDurationInSecondsForClick,
  46   prefs::kPointsBufferedForVelocity,
  47   prefs::kRailBreakProportion,
  48   prefs::kRailStartProportion,
  49   prefs::kFlingAccelerationCurveCoefficient0,
  50   prefs::kFlingAccelerationCurveCoefficient1,
  51   prefs::kFlingAccelerationCurveCoefficient2,
  52   prefs::kFlingAccelerationCurveCoefficient3,
  53   prefs::kFlingVelocityCap,
  54   prefs::kTabScrubActivationDelayInMS,
  55   prefs::kOverscrollHorizontalThresholdComplete,
  56   prefs::kOverscrollVerticalThresholdComplete,
  57   prefs::kOverscrollMinimumThresholdStart,
  58   prefs::kOverscrollVerticalThresholdStart,
  59   prefs::kOverscrollHorizontalResistThreshold,
  60   prefs::kOverscrollVerticalResistThreshold,
  61   prefs::kFlingCurveTouchscreenAlpha,
  62   prefs::kFlingCurveTouchscreenBeta,
  63   prefs::kFlingCurveTouchscreenGamma,
  64   prefs::kFlingCurveTouchpadAlpha,
  65   prefs::kFlingCurveTouchpadBeta,
  66   prefs::kFlingCurveTouchpadGamma,
  67 };
  68
  69 void RevertPreferences(PrefService* prefs,
  70                        std::map<int, const base::Value*>* vals) {
  71   std::map<int, const base::Value*>::const_iterator it;
  72   for (it = vals->begin(); it != vals->end(); ++it) {
  73     if (!prefs->FindPreference(kWhitelist[it->first]))
  74       continue;
  75
  76     if (!it->second) {
  77       prefs->ClearPref(kWhitelist[it->first]);
  78     } else {
  79       prefs->Set(kWhitelist[it->first], *it->second);
  80       delete it->second;
  81     }
  82   }
  83 }
  84
  85 } // namespace
  86
  87 SalsaUI::SalsaUI(content::WebUI* web_ui)
  88     : content::WebUIController(web_ui) {
  89   // Set up the chrome://salsa source.
  90   content::WebUIDataSource* html_source =
  91       content::WebUIDataSource::Create(chrome::kChromeUISalsaHost);
  92
  93   // Register callback handlers.
  94   web_ui->RegisterMessageCallback(
  95       "salsaSetPreferenceValue",
  96       base::Bind(&SalsaUI::SetPreferenceValue,
  97                  base::Unretained(this)));
  98   web_ui->RegisterMessageCallback(
  99       "salsaBackupPreferenceValue",
 100       base::Bind(&SalsaUI::BackupPreferenceValue,
 101                  base::Unretained(this)));
 102
 103   // Add required resources.
 104   html_source->AddResourcePath("salsa.css", IDR_SALSA_CSS);
 105   html_source->AddResourcePath("salsa.js", IDR_SALSA_JS);
 106   html_source->SetDefaultResource(IDR_SALSA_HTML);
 107
 108   Profile* profile = Profile::FromWebUI(web_ui);
 109   content::WebUIDataSource::Add(profile, html_source);
 110 }
 111
 112 SalsaUI::~SalsaUI() {
 113   std::map<int, const base::Value*>* values_to_revert =
 114       new std::map<int, const base::Value*>;
 115   values_to_revert->swap(orig_values_);
 116
 117   Profile* profile = Profile::FromWebUI(web_ui());
 118   PrefService* prefs = profile->GetPrefs();
 119
 120   content::BrowserThread::PostTask(
 121       content::BrowserThread::UI,
 122       FROM_HERE,
 123       base::Bind(&RevertPreferences, prefs, base::Owned(values_to_revert))
 124     );
 125 }
 126
 127 int SalsaUI::WhitelistIndex(const char* key) const {
 128   if (!key)
 129     return -1;
 130
 131   int len = arraysize(kWhitelist);
 132   for (int i = 0; i < len; ++i) {
 133     if (!strcmp(key, kWhitelist[i]))
 134       return i;
 135   }
 136   return -1;
 137 }
 138
 139 void SalsaUI::SetPreferenceValue(const base::ListValue* args) {
 140   std::string pref_name;
 141   const base::Value* value;
 142   if (!args->GetString(0, &pref_name) || !args->Get(1, &value))
 143     return;
 144
 145   int index = WhitelistIndex(pref_name.c_str());
 146   if (index < 0)
 147     return;
 148
 149   Profile* profile = Profile::FromWebUI(web_ui());
 150   PrefService* prefs = profile->GetPrefs();
 151   const PrefService::Preference* pref =
 152       prefs->FindPreference(kWhitelist[index]);
 153
 154   if (pref->GetType() == value->GetType()) {
 155     prefs->Set(kWhitelist[index], *value);
 156   } else if (pref->GetType() == base::Value::TYPE_DOUBLE &&
 157              value->GetType() == base::Value::TYPE_INTEGER) {
 158     int int_val;
 159     if (!value->GetAsInteger(&int_val))
 160       return;
 161     base::FundamentalValue double_val(static_cast<double>(int_val));
 162     prefs->Set(kWhitelist[index], double_val);
 163   }
 164 }
 165
 166 void SalsaUI::BackupPreferenceValue(const base::ListValue* args) {
 167   std::string pref_name;
 168   if (!args->GetString(0, &pref_name))
 169     return;
 170
 171   int index = WhitelistIndex(pref_name.c_str());
 172   if (index < 0)
 173     return;
 174
 175   Profile* profile = Profile::FromWebUI(web_ui());
 176   PrefService* prefs = profile->GetPrefs();
 177   const PrefService::Preference* pref =
 178       prefs->FindPreference(kWhitelist[index]);
 179
 180   if (!pref)
 181     return;
 182
 183   // Get our own copy of the user defined value or NULL if they are using the
 184   // default. You have to make a copy since they'll be used in the destructor
 185   // to restore the values and we need to make sure they're still around.
 186   orig_values_[index] =
 187       pref->IsDefaultValue() ? NULL : pref->GetValue()->DeepCopy();
 188 }