src/chrome/browser/ui/gesture_prefs_observer_factory_aura.cc

   1 // Copyright (c) 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/gesture_prefs_observer_factory_aura.h"
   6
   7 #include <vector>
   8
   9 #include "base/bind.h"
  10 #include "base/bind_helpers.h"
  11 #include "base/compiler_specific.h"
  12 #include "base/prefs/pref_change_registrar.h"
  13 #include "base/prefs/pref_service.h"
  14 #include "chrome/browser/chrome_notification_types.h"
  15 #include "chrome/browser/profiles/incognito_helpers.h"
  16 #include "chrome/browser/profiles/profile.h"
  17 #include "chrome/common/pref_names.h"
  18 #include "components/keyed_service/content/browser_context_dependency_manager.h"
  19 #include "components/keyed_service/core/keyed_service.h"
  20 #include "components/pref_registry/pref_registry_syncable.h"
  21 #include "content/public/browser/notification_observer.h"
  22 #include "content/public/browser/notification_service.h"
  23 #include "content/public/browser/overscroll_configuration.h"
  24 #include "content/public/common/renderer_preferences.h"
  25 #include "ui/events/gesture_detection/gesture_configuration.h"
  26
  27 using ui::GestureConfiguration;
  28
  29 namespace {
  30
  31 struct OverscrollPref {
  32   const char* pref_name;
  33   content::OverscrollConfig config;
  34 };
  35
  36 const std::vector<OverscrollPref>& GetOverscrollPrefs() {
  37   CR_DEFINE_STATIC_LOCAL(std::vector<OverscrollPref>, overscroll_prefs, ());
  38   if (overscroll_prefs.empty()) {
  39     using namespace content;
  40     const OverscrollPref kOverscrollPrefs[] = {
  41       { prefs::kOverscrollHorizontalThresholdComplete,
  42         OVERSCROLL_CONFIG_HORIZ_THRESHOLD_COMPLETE },
  43       { prefs::kOverscrollVerticalThresholdComplete,
  44         OVERSCROLL_CONFIG_VERT_THRESHOLD_COMPLETE },
  45       { prefs::kOverscrollMinimumThresholdStart,
  46         OVERSCROLL_CONFIG_HORIZ_THRESHOLD_START_TOUCHSCREEN },
  47       { prefs::kOverscrollMinimumThresholdStartTouchpad,
  48         OVERSCROLL_CONFIG_HORIZ_THRESHOLD_START_TOUCHPAD },
  49       { prefs::kOverscrollVerticalThresholdStart,
  50         OVERSCROLL_CONFIG_VERT_THRESHOLD_START },
  51       { prefs::kOverscrollHorizontalResistThreshold,
  52         OVERSCROLL_CONFIG_HORIZ_RESIST_AFTER },
  53       { prefs::kOverscrollVerticalResistThreshold,
  54         OVERSCROLL_CONFIG_VERT_RESIST_AFTER },
  55     };
  56     overscroll_prefs.assign(kOverscrollPrefs,
  57                             kOverscrollPrefs + arraysize(kOverscrollPrefs));
  58   }
  59   return overscroll_prefs;
  60 }
  61
  62 // This class manages gesture configuration preferences.
  63 class GesturePrefsObserver : public KeyedService {
  64  public:
  65   explicit GesturePrefsObserver(PrefService* prefs);
  66   ~GesturePrefsObserver() override;
  67
  68   // KeyedService implementation.
  69   void Shutdown() override;
  70
  71  private:
  72   // Notification callback invoked when browser-side preferences
  73   // are updated and need to be pushed into ui::GesturePreferences.
  74   void Update();
  75
  76   // Notification callback invoked when the fling deacceleration
  77   // gesture preferences are changed from chrome://gesture.
  78   // Broadcasts the changes all renderers where they are used.
  79   void Notify();
  80
  81   // Notification helper to push overscroll preferences into
  82   // content.
  83   void UpdateOverscrollPrefs();
  84
  85   PrefChangeRegistrar registrar_;
  86   PrefService* prefs_;
  87
  88   DISALLOW_COPY_AND_ASSIGN(GesturePrefsObserver);
  89 };
  90
  91 // The list of prefs we want to observe.
  92 // Note that this collection of settings should correspond to the settings used
  93 // in ui/events/gestures/gesture_configuration.h
  94 const char* kPrefsToObserve[] = {
  95   prefs::kFlingMaxCancelToDownTimeInMs,
  96   prefs::kFlingMaxTapGapTimeInMs,
  97   prefs::kTabScrubActivationDelayInMs,
  98   prefs::kMaxSeparationForGestureTouchesInPixels,
  99   prefs::kSemiLongPressTimeInMs,
 100 };
 101
 102 const char* kPrefsToRemove[] = {
 103     "gesture.fling_acceleration_curve_coefficient_0",
 104     "gesture.fling_acceleration_curve_coefficient_1",
 105     "gesture.fling_acceleration_curve_coefficient_2",
 106     "gesture.fling_acceleration_curve_coefficient_3",
 107     "gesture.semi_long_press_time_in_seconds",
 108     "flingcurve.touchpad_alpha",
 109     "flingcurve.touchpad_beta",
 110     "flingcurve.touchpad_gamma",
 111     "flingcurve.touchscreen_alpha",
 112     "flingcurve.touchscreen_beta",
 113     "flingcurve.touchscreen_gamma",
 114 };
 115
 116 GesturePrefsObserver::GesturePrefsObserver(PrefService* prefs)
 117     : prefs_(prefs) {
 118   for (size_t i = 0; i < arraysize(kPrefsToRemove); ++i) {
 119     if (prefs->FindPreference(kPrefsToRemove[i]))
 120       prefs->ClearPref(kPrefsToRemove[i]);
 121   }
 122
 123   registrar_.Init(prefs);
 124   registrar_.RemoveAll();
 125   base::Closure callback = base::Bind(&GesturePrefsObserver::Update,
 126                                       base::Unretained(this));
 127
 128   base::Closure notify_callback = base::Bind(&GesturePrefsObserver::Notify,
 129                                              base::Unretained(this));
 130
 131   for (size_t i = 0; i < arraysize(kPrefsToObserve); ++i)
 132     registrar_.Add(kPrefsToObserve[i], callback);
 133
 134   const std::vector<OverscrollPref>& overscroll_prefs = GetOverscrollPrefs();
 135   for (size_t i = 0; i < overscroll_prefs.size(); ++i)
 136     registrar_.Add(overscroll_prefs[i].pref_name, callback);
 137
 138   Update();
 139 }
 140
 141 GesturePrefsObserver::~GesturePrefsObserver() {}
 142
 143 void GesturePrefsObserver::Shutdown() {
 144   registrar_.RemoveAll();
 145 }
 146
 147 void GesturePrefsObserver::Update() {
 148   GestureConfiguration* gesture_config = GestureConfiguration::GetInstance();
 149   gesture_config->set_fling_max_cancel_to_down_time_in_ms(
 150       prefs_->GetInteger(prefs::kFlingMaxCancelToDownTimeInMs));
 151   gesture_config->set_fling_max_tap_gap_time_in_ms(
 152       prefs_->GetInteger(prefs::kFlingMaxTapGapTimeInMs));
 153   gesture_config->set_tab_scrub_activation_delay_in_ms(
 154       prefs_->GetInteger(prefs::kTabScrubActivationDelayInMs));
 155   gesture_config->set_semi_long_press_time_in_ms(
 156       prefs_->GetInteger(prefs::kSemiLongPressTimeInMs));
 157   gesture_config->set_max_separation_for_gesture_touches_in_pixels(
 158       static_cast<float>(
 159           prefs_->GetDouble(prefs::kMaxSeparationForGestureTouchesInPixels)));
 160
 161   UpdateOverscrollPrefs();
 162 }
 163
 164 void GesturePrefsObserver::UpdateOverscrollPrefs() {
 165   const std::vector<OverscrollPref>& overscroll_prefs = GetOverscrollPrefs();
 166   for (size_t i = 0; i < overscroll_prefs.size(); ++i) {
 167     content::SetOverscrollConfig(overscroll_prefs[i].config,
 168         static_cast<float>(prefs_->GetDouble(overscroll_prefs[i].pref_name)));
 169   }
 170 }
 171
 172 void GesturePrefsObserver::Notify() {
 173   // Must do a notify to distribute the changes to all renderers.
 174   content::NotificationService* service =
 175       content::NotificationService::current();
 176   service->Notify(chrome::NOTIFICATION_BROWSER_FLING_CURVE_PARAMETERS_CHANGED,
 177                   content::Source<GesturePrefsObserver>(this),
 178                   content::NotificationService::NoDetails());
 179 }
 180
 181 }  // namespace
 182
 183 // static
 184 GesturePrefsObserverFactoryAura*
 185 GesturePrefsObserverFactoryAura::GetInstance() {
 186   return Singleton<GesturePrefsObserverFactoryAura>::get();
 187 }
 188
 189 GesturePrefsObserverFactoryAura::GesturePrefsObserverFactoryAura()
 190     : BrowserContextKeyedServiceFactory(
 191         "GesturePrefsObserverAura",
 192         BrowserContextDependencyManager::GetInstance()) {}
 193
 194 GesturePrefsObserverFactoryAura::~GesturePrefsObserverFactoryAura() {}
 195
 196 KeyedService* GesturePrefsObserverFactoryAura::BuildServiceInstanceFor(
 197     content::BrowserContext* profile) const {
 198   return new GesturePrefsObserver(static_cast<Profile*>(profile)->GetPrefs());
 199 }
 200
 201 void GesturePrefsObserverFactoryAura::RegisterOverscrollPrefs(
 202     user_prefs::PrefRegistrySyncable* registry) {
 203   const std::vector<OverscrollPref>& overscroll_prefs = GetOverscrollPrefs();
 204
 205   for (size_t i = 0; i < overscroll_prefs.size(); ++i) {
 206     registry->RegisterDoublePref(
 207         overscroll_prefs[i].pref_name,
 208         content::GetOverscrollConfig(overscroll_prefs[i].config),
 209         user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 210   }
 211 }
 212
 213 void GesturePrefsObserverFactoryAura::RegisterProfilePrefs(
 214     user_prefs::PrefRegistrySyncable* registry) {
 215   GestureConfiguration* gesture_config = GestureConfiguration::GetInstance();
 216   registry->RegisterIntegerPref(
 217       prefs::kFlingMaxCancelToDownTimeInMs,
 218       gesture_config->fling_max_cancel_to_down_time_in_ms(),
 219       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 220   registry->RegisterIntegerPref(
 221       prefs::kFlingMaxTapGapTimeInMs,
 222       gesture_config->fling_max_tap_gap_time_in_ms(),
 223       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 224   registry->RegisterIntegerPref(
 225       prefs::kTabScrubActivationDelayInMs,
 226       gesture_config->tab_scrub_activation_delay_in_ms(),
 227       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 228   registry->RegisterIntegerPref(
 229       prefs::kSemiLongPressTimeInMs,
 230       gesture_config->semi_long_press_time_in_ms(),
 231       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 232   registry->RegisterDoublePref(
 233       prefs::kMaxSeparationForGestureTouchesInPixels,
 234       gesture_config->max_separation_for_gesture_touches_in_pixels(),
 235       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 236   RegisterOverscrollPrefs(registry);
 237 }
 238
 239 bool
 240 GesturePrefsObserverFactoryAura::ServiceIsCreatedWithBrowserContext() const {
 241   // Create the observer as soon as the profile is created.
 242   return true;
 243 }
 244
 245 content::BrowserContext*
 246 GesturePrefsObserverFactoryAura::GetBrowserContextToUse(
 247     content::BrowserContext* context) const {
 248   // Use same gesture preferences on incognito windows.
 249   return chrome::GetBrowserContextRedirectedInIncognito(context);
 250 }
 251
 252 bool GesturePrefsObserverFactoryAura::ServiceIsNULLWhileTesting() const {
 253   // Some tests replace the PrefService of the TestingProfile after the
 254   // GesturePrefsObserver has been created, which makes Shutdown()
 255   // remove the registrar from a non-existent PrefService.
 256   return true;
 257 }