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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 #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 }
    189