Support for cros touchpad 3-finger click as middle button.

chrome/browser/chromeos/preferences.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 "chrome/browser/chromeos/preferences.h"
 
 #include "base/chromeos/chromeos_version.h"
 #include "base/command_line.h"
 #include "base/i18n/time_formatting.h"
 #include "base/metrics/histogram.h"
@@ skipping 55 matching lines @@
     hardware_keyboard_id =
         manager->GetInputMethodUtil()->GetHardwareInputMethodId();
   } else {
     hardware_keyboard_id = "xkb:us::eng";  // only for testing.
   }
 
   const bool enable_tap_to_click_default = IsLumpy();
   prefs->RegisterBooleanPref(prefs::kTapToClickEnabled,
                              enable_tap_to_click_default,
                              PrefService::SYNCABLE_PREF);
+  prefs->RegisterBooleanPref(prefs::kEnableTouchpadThreeFingerClick,
+                             false,
+                             PrefService::UNSYNCABLE_PREF);
   prefs->RegisterBooleanPref(prefs::kNaturalScroll,
                              false,
                              PrefService::SYNCABLE_PREF);
   prefs->RegisterBooleanPref(prefs::kPrimaryMouseButtonRight,
                              false,
                              PrefService::SYNCABLE_PREF);
   prefs->RegisterBooleanPref(prefs::kLabsMediaplayerEnabled,
                              false,
                              PrefService::UNSYNCABLE_PREF);
   prefs->RegisterBooleanPref(prefs::kLabsAdvancedFilesystemEnabled,
@@ skipping 166 matching lines @@
   prefs->RegisterStringPref(prefs::kOAuth1Token,
                             "",
                             PrefService::UNSYNCABLE_PREF);
   prefs->RegisterStringPref(prefs::kOAuth1Secret,
                             "",
                             PrefService::UNSYNCABLE_PREF);
 }
 
 void Preferences::InitUserPrefs(PrefService* prefs) {
   tap_to_click_enabled_.Init(prefs::kTapToClickEnabled, prefs, this);
+  three_finger_click_enabled_.Init(prefs::kEnableTouchpadThreeFingerClick,
+      prefs, this);
   natural_scroll_.Init(prefs::kNaturalScroll, prefs, this);
   accessibility_enabled_.Init(prefs::kSpokenFeedbackEnabled, prefs, this);
   mouse_sensitivity_.Init(prefs::kMouseSensitivity, prefs, this);
   touchpad_sensitivity_.Init(prefs::kTouchpadSensitivity, prefs, this);
   use_24hour_clock_.Init(prefs::kUse24HourClock, prefs, this);
   disable_gdata_.Init(prefs::kDisableGData, prefs, this);
   disable_gdata_over_cellular_.Init(prefs::kDisableGDataOverCellular,
                                    prefs, this);
   disable_gdata_hosted_files_.Init(prefs::kDisableGDataHostedFiles,
                                    prefs, this);
@@ skipping 93 matching lines @@
 
 void Preferences::NotifyPrefChanged(const std::string* pref_name) {
   if (!pref_name || *pref_name == prefs::kTapToClickEnabled) {
     const bool enabled = tap_to_click_enabled_.GetValue();
     system::touchpad_settings::SetTapToClick(enabled);
     if (pref_name)
       UMA_HISTOGRAM_BOOLEAN("Touchpad.TapToClick.Changed", enabled);
     else
       UMA_HISTOGRAM_BOOLEAN("Touchpad.TapToClick.Started", enabled);
   }
+  if (!pref_name || *pref_name == prefs::kEnableTouchpadThreeFingerClick) {
+    const bool enabled = three_finger_click_enabled_.GetValue();
+    system::touchpad_settings::SetThreeFingerClick(enabled);
+    if (pref_name)
+      UMA_HISTOGRAM_BOOLEAN("Touchpad.ThreeFingerClick.Changed", enabled);
+    else
+      UMA_HISTOGRAM_BOOLEAN("Touchpad.ThreeFingerClick.Started", enabled);
+  }
   if (!pref_name || *pref_name == prefs::kNaturalScroll) {
     const bool enabled = natural_scroll_.GetValue();
     ui::SetNaturalScroll(enabled);
     if (pref_name)
       UMA_HISTOGRAM_BOOLEAN("Touchpad.NaturalScroll.Changed", enabled);
     else
       UMA_HISTOGRAM_BOOLEAN("Touchpad.NaturalScroll.Started", enabled);
   }
   if (!pref_name || *pref_name == prefs::kMouseSensitivity) {
     const int sensitivity = mouse_sensitivity_.GetValue();
@@ skipping 312 matching lines @@
 
   // Remove invalid prefs.
   DictionaryPrefUpdate updater(prefs, prefs::kLanguagePreferredVirtualKeyboard);
   DictionaryValue* pref_value = updater.Get();
   for (size_t i = 0; i < layouts_to_remove.size(); ++i) {
     pref_value->RemoveWithoutPathExpansion(layouts_to_remove[i], NULL);
   }
 }
 
 }  // namespace chromeos