MD Settings: Add mouse settings, update pointer settings

chrome/browser/ui/webui/settings/chromeos/device_pointer_handler.cc

+// Copyright 2016 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/ui/webui/settings/chromeos/device_pointer_handler.h"
+
+#include "base/bind.h"
+#include "base/sys_info.h"
+#include "base/values.h"
+#include "content/public/browser/web_ui.h"
+
+namespace chromeos {
+namespace settings {
+
+PointerHandler::PointerHandler() {}
+
+PointerHandler::~PointerHandler() {}
+
+void PointerHandler::RegisterMessages() {
+  web_ui()->RegisterMessageCallback(
+      "initializePointerSettings",
+      base::Bind(&PointerHandler::HandleInitialize, base::Unretained(this)));
+}
+
+void PointerHandler::OnJavascriptAllowed() {
+  if (!pointer_device_observer_) {
+    pointer_device_observer_.reset(new system::PointerDeviceObserver());
+    pointer_device_observer_->Init();
+  }
+
+  pointer_device_observer_->AddObserver(this);
+  pointer_device_observer_->CheckDevices();
+}
+
+void PointerHandler::OnJavascriptDisallowed() {
+  pointer_device_observer_->RemoveObserver(this);
+}
+
+void PointerHandler::TouchpadExists(bool exists) {
+  CallJavascriptFunction("cr.webUIListenerCallback",
+                         base::StringValue("has-touchpad-changed"),
+                         base::FundamentalValue(exists));
+}
+
+void PointerHandler::MouseExists(bool exists) {
+  CallJavascriptFunction("cr.webUIListenerCallback",
+                         base::StringValue("has-mouse-changed"),
+                         base::FundamentalValue(exists));
+}
+
+void PointerHandler::HandleInitialize(const base::ListValue* args) {
+  AllowJavascript();
+}
+
+}  // namespace settings
+}  // namespace chromeos