Adding persistance for gesture recognition parms.

chrome/browser/ui/views/ash/gesture_prefs_aura.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/memory/singleton.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/ui/gesture_prefs.h"
+#include "chrome/browser/prefs/pref_change_registrar.h"
+#include "chrome/browser/prefs/pref_service.h"
+#include "chrome/common/chrome_notification_types.h"
+#include "chrome/common/pref_names.h"
+#include "content/public/browser/notification_observer.h"
+#include "ui/aura/gestures/gesture_configuration.h"
+
+using aura::GestureConfiguration;
+
+namespace {
+
+// This class manages gesture configuration preferences.
+class GesturePrefsObserverAura : public content::NotificationObserver {
+ public:
+  static GesturePrefsObserverAura *GetInstance();
+  void RegisterPrefs(PrefService* prefs);
+
+ private:
+  GesturePrefsObserverAura();
+  friend struct DefaultSingletonTraits<GesturePrefsObserverAura>;
+  virtual ~GesturePrefsObserverAura();
+
+  // content::NotificationObserver implementation.
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+ private:
+  void Update();
+
+  PrefChangeRegistrar registrar_;
+  PrefService* local_state_;
+  DISALLOW_COPY_AND_ASSIGN(GesturePrefsObserverAura);
+};
+
+// The list of prefs we want to observe.
+// Note that this collection of settings should correspond to the settings used
+// in ui/aura/gestures/gesture_configuration.h
+const char* kPrefsToObserve[] = {
+  prefs::kMaximumSecondsBetweenDoubleClick,
+  prefs::kMaximumTouchDownDurationInSecondsForClick,
+  prefs::kMaximumTouchMoveInPixelsForClick,
+  prefs::kMinFlickSpeedSquared,
+  prefs::kMinimumTouchDownDurationInSecondsForClick,
+};
+
+const int kPrefsToObserveLength = arraysize(kPrefsToObserve);
+
+GesturePrefsObserverAura::GesturePrefsObserverAura()
+  : local_state_(0) {
+}
+
+GesturePrefsObserverAura::~GesturePrefsObserverAura() {
+}
+
+GesturePrefsObserverAura* GesturePrefsObserverAura::GetInstance() {
+  return Singleton<GesturePrefsObserverAura,
+    LeakySingletonTraits<GesturePrefsObserverAura> >::get();
+}
+
+void GesturePrefsObserverAura::RegisterPrefs(PrefService* local_state) {
+  if (local_state_ == 0) {
+    local_state_ = local_state;
+
+    if (local_state_) {
+      local_state_->RegisterDoublePref(
+        prefs::kMaximumSecondsBetweenDoubleClick, 0.7);
+      local_state_->RegisterDoublePref(
+        prefs::kMaximumTouchDownDurationInSecondsForClick, 0.8);
+      local_state_->RegisterDoublePref(
+        prefs::kMaximumTouchMoveInPixelsForClick, 20);
+      local_state_->RegisterDoublePref(
+        prefs::kMinFlickSpeedSquared, 550.f*550.f);
+      local_state_->RegisterDoublePref(
+        prefs::kMinimumTouchDownDurationInSecondsForClick, 0.01);
+
+      registrar_.Init(local_state_);
+      registrar_.RemoveAll();
+      for (int i = 0; i < kPrefsToObserveLength; ++i)
+        registrar_.Add(kPrefsToObserve[i], this);
+    }
+  }
+}
+
+void GesturePrefsObserverAura::Update() {
+  if (local_state_) {
+    GestureConfiguration::set_max_seconds_between_double_click(
+      local_state_->GetDouble(prefs::kMaximumSecondsBetweenDoubleClick));
+    GestureConfiguration::set_max_touch_down_duration_in_seconds_for_click(
+      local_state_->GetDouble(
+      prefs::kMaximumTouchDownDurationInSecondsForClick));
+    GestureConfiguration::set_max_touch_move_in_pixels_for_click(
+      local_state_->GetDouble(prefs::kMaximumTouchMoveInPixelsForClick));
+    GestureConfiguration::set_min_flick_speed_squared(
+      local_state_->GetDouble(prefs::kMinFlickSpeedSquared));
+    GestureConfiguration::set_min_touch_down_duration_in_seconds_for_click(
+      local_state_->GetDouble(
+      prefs::kMinimumTouchDownDurationInSecondsForClick));
+  }
+}
+
+void GesturePrefsObserverAura::Observe(int type,
+                           const content::NotificationSource& source,
+                           const content::NotificationDetails& details) {
+  Update();
+}
+
+} // namespace
+
+void GesturePrefsRegisterPrefs(PrefService* prefs) {
+  GesturePrefsObserverAura::GetInstance()->RegisterPrefs(prefs);
+}