device_data_manager.h revision 116680a4aac90f2aa7413d9095a592090648e557 
1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef UI_EVENTS_DEVICE_DATA_MANAGER_H_
6#define UI_EVENTS_DEVICE_DATA_MANAGER_H_
7
8#include <stdint.h>
9
10#include "base/macros.h"
11#include "base/memory/scoped_ptr.h"
12#include "ui/events/events_base_export.h"
13#include "ui/gfx/transform.h"
14
15namespace ui {
16
17// Keeps track of device mappings and event transformations.
18class EVENTS_BASE_EXPORT DeviceDataManager {
19 public:
20  virtual ~DeviceDataManager();
21
22  static void CreateInstance();
23  static DeviceDataManager* GetInstance();
24  static bool HasInstance();
25
26  void ClearTouchTransformerRecord();
27  void UpdateTouchInfoForDisplay(int64_t display_id,
28                                 int touch_device_id,
29                                 const gfx::Transform& touch_transformer);
30  void ApplyTouchTransformer(int touch_device_id, float* x, float* y);
31  int64_t GetDisplayForTouchDevice(int touch_device_id) const;
32
33 protected:
34  DeviceDataManager();
35
36  static DeviceDataManager* instance();
37
38  static const int kMaxDeviceNum = 128;
39
40 private:
41  static DeviceDataManager* instance_;
42
43  bool IsTouchDeviceIdValid(int touch_device_id) const;
44
45  // Table to keep track of which display id is mapped to which touch device.
46  int64_t touch_device_to_display_map_[kMaxDeviceNum];
47  // Index table to find the TouchTransformer for a touch device.
48  gfx::Transform touch_device_transformer_map_[kMaxDeviceNum];
49
50  DISALLOW_COPY_AND_ASSIGN(DeviceDataManager);
51};
52
53}  // namespace ui
54
55#endif  // UI_EVENTS_DEVICE_DATA_MANAGER_H_
56