ui/events/device_data_manager.h

   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
  15 namespace ui {
  16
  17 // Keeps track of device mappings and event transformations.
  18 class 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_