Sync ui/events to chromium @ https://codereview.chromium.org/1210203002

ui/events/device_data_manager.h

-// Copyright 2014 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 UI_EVENTS_DEVICE_DATA_MANAGER_H_
-#define UI_EVENTS_DEVICE_DATA_MANAGER_H_
-
-#include <stdint.h>
-
-#include <vector>
-
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/observer_list.h"
-#include "ui/events/device_hotplug_event_observer.h"
-#include "ui/events/events_base_export.h"
-#include "ui/events/touchscreen_device.h"
-#include "ui/gfx/transform.h"
-
-namespace ui {
-
-class InputDeviceEventObserver;
-
-// Keeps track of device mappings and event transformations.
-class EVENTS_BASE_EXPORT DeviceDataManager : public DeviceHotplugEventObserver {
- public:
-  ~DeviceDataManager() override;
-
-  static void CreateInstance();
-  static DeviceDataManager* GetInstance();
-  static bool HasInstance();
-
-  void ClearTouchTransformerRecord();
-  void UpdateTouchInfoForDisplay(int64_t display_id,
-                                 int touch_device_id,
-                                 const gfx::Transform& touch_transformer);
-  void ApplyTouchTransformer(int touch_device_id, float* x, float* y);
-  int64_t GetDisplayForTouchDevice(int touch_device_id) const;
-
-  void UpdateTouchRadiusScale(int touch_device_id, double scale);
-  void ApplyTouchRadiusScale(int touch_device_id, double* radius);
-
-  const std::vector<TouchscreenDevice>& touchscreen_devices() const {
-    return touchscreen_devices_;
-  }
-
-  void AddObserver(InputDeviceEventObserver* observer);
-  void RemoveObserver(InputDeviceEventObserver* observer);
-
- protected:
-  DeviceDataManager();
-
-  static DeviceDataManager* instance();
-
-  static const int kMaxDeviceNum = 128;
-
- private:
-  static DeviceDataManager* instance_;
-
-  bool IsTouchDeviceIdValid(int touch_device_id) const;
-
-  // DeviceHotplugEventObserver:
-  void OnTouchscreenDevicesUpdated(
-      const std::vector<TouchscreenDevice>& devices) override;
-
-  double touch_radius_scale_map_[kMaxDeviceNum];
-
-  // Table to keep track of which display id is mapped to which touch device.
-  int64_t touch_device_to_display_map_[kMaxDeviceNum];
-  // Index table to find the TouchTransformer for a touch device.
-  gfx::Transform touch_device_transformer_map_[kMaxDeviceNum];
-
-  std::vector<TouchscreenDevice> touchscreen_devices_;
-
-  base::ObserverList<InputDeviceEventObserver> observers_;
-
-  DISALLOW_COPY_AND_ASSIGN(DeviceDataManager);
-};
-
-}  // namespace ui
-
-#endif  // UI_EVENTS_DEVICE_DATA_MANAGER_H_