arc-bridge: Introduce the ArcService class

components/arc/input/arc_input_bridge_impl.h

-// Copyright 2015 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.
-
-#ifndef COMPONENTS_ARC_INPUT_ARC_INPUT_BRIDGE_IMPL_H_
-#define COMPONENTS_ARC_INPUT_ARC_INPUT_BRIDGE_IMPL_H_
-
-#include <stdint.h>
-#include <string>
-#include <vector>
-
-#include "base/files/scoped_file.h"
-#include "base/macros.h"
-#include "components/arc/input/arc_input_bridge.h"
-#include "ui/aura/env.h"
-#include "ui/aura/env_observer.h"
-#include "ui/aura/window_tracker.h"
-#include "ui/events/event.h"
-#include "ui/events/event_handler.h"
-
-namespace aura {
-class Window;
-}
-
-namespace ui {
-enum class DomCode;
-}
-
-namespace arc {
-
-class ArcBridgeService;
-
-// Private implementation of ArcInputBridge
-class ArcInputBridgeImpl : public ArcInputBridge,
-                           public ArcBridgeService::Observer,
-                           public aura::EnvObserver,
-                           public ui::EventHandler {
- public:
-  // The constructor will register an Observer with aura::Env and the
-  // ArcBridgeService. From then on, no further interaction with this class
-  // is needed.
-  explicit ArcInputBridgeImpl(ArcBridgeService* arc_bridge_service);
-  ~ArcInputBridgeImpl() override;
-
-  // Overridden from ui::EventHandler:
-  void OnEvent(ui::Event* event) override;
-
-  // Overridden from aura::EnvObserver:
-  void OnWindowInitialized(aura::Window* new_window) override;
-
-  // Overridden from ArcBridgeService::Observer:
-  void OnInputInstanceReady() override;
-
- private:
-  // Specialized method to translate and send events to the right file
-  // descriptor.
-  void SendKeyEvent(ui::KeyEvent* event);
-  void SendTouchEvent(ui::TouchEvent* event);
-  void SendMouseEvent(ui::MouseEvent* event);
-
-  // Helper method to send a struct input_event to the file descriptor. This
-  // method is to be called on the ui thread and will post a request to send
-  // the event to the io thread.
-  // The parameters map directly to the members of input_event as
-  // defined by the evdev protocol.
-  // |type| is the type of event to sent, such as EV_SYN, EV_KEY, EV_ABS.
-  // |code| is either interpreted as axis (ABS_X, ABS_Y, ...) or as key-code
-  //        (KEY_A, KEY_B, ...).
-  // |value| is either the value of that axis or the boolean value of the key
-  //         as in 0 (released), 1 (pressed) or 2 (repeated press).
-  void SendKernelEvent(const base::ScopedFD& fd,
-                       base::TimeDelta timestamp,
-                       uint16_t type,
-                       uint16_t code,
-                       int value);
-
-  // Shorthand for sending EV_SYN/SYN_REPORT
-  void SendSynReport(const base::ScopedFD& fd, base::TimeDelta timestamp);
-
-  // Return existing or new slot for this event.
-  int AcquireTouchSlot(ui::TouchEvent* event);
-
-  // Return touch slot for tracking id.
-  int FindTouchSlot(int tracking_id);
-
-  // Maps DOM key codes to evdev key codes
-  uint16_t DomCodeToEvdevCode(ui::DomCode dom_code);
-
-  // Setup bridge devices on the instance side. This needs to be called after
-  // the InstanceBootPhase::SYSTEM_SERVICES_READY has been reached.
-  void SetupBridgeDevices();
-
-  // Creates and registers file descriptor pair with the ARC bridge service,
-  // the write end is returned while the read end is sent through the bridge
-  // to the ARC instance.
-  // TODO(denniskempin): Make this interface more typesafe.
-  // |name| should be the displayable name of the emulated device (e.g. "Chrome
-  // OS Keyboard"), |device_type| the name of the device type (e.g. "keyboard")
-  // and |fd| a file descriptor that emulates the kernel events of the device.
-  // This can only be called on the thread that this class was created on.
-  base::ScopedFD CreateBridgeInputDevice(const std::string& name,
-                                         const std::string& device_type);
-
-  // Owned by ArcServiceManager which makes sure ArcBridgeService is destroyed
-  // after ArcInputBridge.
-  ArcBridgeService* arc_bridge_service_;
-
-  // File descriptors for the different device types.
-  base::ScopedFD keyboard_fd_;
-  base::ScopedFD mouse_fd_;
-  base::ScopedFD touchscreen_fd_;
-
-  // Scroll accumlator.
-  float offset_x_acc_;
-  float offset_y_acc_;
-
-  // Currently selected slot for multi-touch events.
-  int current_slot_;
-
-  // List of touch tracking id to slot assignments.
-  std::vector<int> current_slot_tracking_ids_;
-
-  scoped_refptr<base::SequencedTaskRunner> origin_task_runner_;
-
-  // List of windows we are hooked into
-  aura::WindowTracker arc_windows_;
-
-  // WeakPtrFactory to use for callbacks.
-  base::WeakPtrFactory<ArcInputBridgeImpl> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(ArcInputBridgeImpl);
-};
-
-}  // namespace arc
-
-#endif  // COMPONENTS_ARC_INPUT_ARC_INPUT_BRIDGE_IMPL_H_