Add Mojo IPC based input-device service.

components/input_device_service/input_device_server.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 "components/input_device_service/input_device_server.h"
+
+#include <utility>
+#include <vector>
+
+#include "mojo/public/cpp/bindings/array.h"
+#include "ui/events/devices/device_data_manager.h"
+
+namespace input_device {
+
+using ui::DeviceDataManager;
+
+namespace {
+
+template <class T>
+std::vector<ui::InputDevice> ToInputDevices(const std::vector<T>& input) {
+  std::vector<ui::InputDevice> devices;
+  for (const T& device : input) {
+    devices.push_back(ui::InputDevice(device));
+  }
+  return devices;
+}
+
+std::vector<ui::InputDevice> GetKeyboardList() {
+  // TODO(kylechar): Change DDM to hold ui::InputDevice instead.
+  return ToInputDevices(DeviceDataManager::GetInstance()->keyboard_devices());
+}
+
+std::vector<ui::InputDevice> GetTouchscreenList() {
+  // TODO(kylechar): Change DDM to hold ui::InputDevice instead.
+  return ToInputDevices(
+      DeviceDataManager::GetInstance()->touchscreen_devices());
+}
+
+const std::vector<ui::InputDevice>& GetMouseList() {
+  return DeviceDataManager::GetInstance()->mouse_devices();
+}
+
+const std::vector<ui::InputDevice>& GetTouchpadList() {
+  return DeviceDataManager::GetInstance()->touchpad_devices();
+}
+
+}  // namespace
+
+InputDeviceServer::InputDeviceServer() {}
+
+InputDeviceServer::~InputDeviceServer() {
+  if (is_observing_ && DeviceDataManager::HasInstance()) {
+    DeviceDataManager::GetInstance()->RemoveObserver(this);
+  }
+  is_observing_ = false;
+}
+
+void InputDeviceServer::RegisterAsObserver() {
+  if (!is_observing_) {
+    DeviceDataManager::GetInstance()->AddObserver(this);

[sadrul, 2016/05/25 20:40:08]

What creates this DDM instance?

[kylechar, 2016/05/27 19:52:22]

It's created as part of Ozone initialization or as part of PlatformEventSource
initialization, depending on a couple different things (eg. are you running
under Ozone, what Ozone platform, etc). The instance can be either a
DeviceDataManager or DeviceDataManagerX11 right now.

That should hopefully all go away in the future and possible InputDeviceServer
could own DDM. It would also avoid the need for this method that gets called
after DDM is created.

+    is_observing_ = true;
+  }
+}
+
+void InputDeviceServer::RegisterInterface(shell::Connection* connection) {
+  DCHECK(is_observing_);
+  connection->AddInterface<mojom::InputDeviceService>(this);
+}
+
+void InputDeviceServer::Create(shell::Connection* connection,
+                               mojom::InputDeviceServiceRequest request) {
+  bindings_.AddBinding(this, std::move(request));
+}
+
+void InputDeviceServer::AddObserver(mojom::InputDeviceObserverPtr observer) {
+  observers_.AddPtr(std::move(observer));
+}
+
+void InputDeviceServer::OnKeyboardDeviceConfigurationChanged() {
+  auto devices = GetKeyboardList();
+  observers_.ForAllPtrs([&devices](mojom::InputDeviceObserver* observer) {
+    observer->OnKeyboardDeviceConfigurationChanged(
+        mojo::Array<ui::InputDevice>::From(devices));
+  });
+}
+
+void InputDeviceServer::OnTouchscreenDeviceConfigurationChanged() {
+  auto devices = GetTouchscreenList();
+  observers_.ForAllPtrs([&devices](mojom::InputDeviceObserver* observer) {
+    observer->OnTouchscreenDeviceConfigurationChanged(
+        mojo::Array<ui::InputDevice>::From(devices));
+  });
+}
+
+void InputDeviceServer::OnMouseDeviceConfigurationChanged() {
+  auto& devices = GetMouseList();
+  LOG(ERROR) << "InputDeviceServer::OnMouseDeviceConfigurationChanged "
+             << devices.size();
+  observers_.ForAllPtrs([&devices](mojom::InputDeviceObserver* observer) {
+    observer->OnMouseDeviceConfigurationChanged(
+        mojo::Array<ui::InputDevice>::From(devices));
+  });
+}
+
+void InputDeviceServer::OnTouchpadDeviceConfigurationChanged() {
+  auto& devices = GetTouchpadList();
+  observers_.ForAllPtrs([&devices](mojom::InputDeviceObserver* observer) {
+    observer->OnTouchpadDeviceConfigurationChanged(
+        mojo::Array<ui::InputDevice>::From(devices));
+  });
+}
+
+void InputDeviceServer::GetKeyboardDevices(
+    const GetKeyboardDevicesCallback& callback) {
+  callback.Run(mojo::Array<ui::InputDevice>::From(GetKeyboardList()));
+}
+
+void InputDeviceServer::GetTouchscreenDevices(
+    const GetTouchscreenDevicesCallback& callback) {
+  callback.Run(mojo::Array<ui::InputDevice>::From(GetTouchscreenList()));
+}
+
+void InputDeviceServer::GetMouseDevices(
+    const GetMouseDevicesCallback& callback) {
+  callback.Run(mojo::Array<ui::InputDevice>::From(GetMouseList()));
+}
+
+void InputDeviceServer::GetTouchpadDevices(
+    const GetTouchpadDevicesCallback& callback) {
+  callback.Run(mojo::Array<ui::InputDevice>::From(GetTouchpadList()));
+}
+
+}  // namespace input_device