ui/events/devices/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_DEVICES_DEVICE_DATA_MANAGER_H_
   6 #define UI_EVENTS_DEVICES_DEVICE_DATA_MANAGER_H_
   7
   8 #include <stdint.h>
   9
  10 #include <vector>
  11
  12 #include "base/macros.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/observer_list.h"
  15 #include "ui/events/devices/device_hotplug_event_observer.h"
  16 #include "ui/events/devices/events_devices_export.h"
  17 #include "ui/events/devices/keyboard_device.h"
  18 #include "ui/events/devices/touchscreen_device.h"
  19 #include "ui/gfx/transform.h"
  20
  21 namespace ui {
  22
  23 class InputDeviceEventObserver;
  24
  25 // Keeps track of device mappings and event transformations.
  26 class EVENTS_DEVICES_EXPORT DeviceDataManager
  27     : public DeviceHotplugEventObserver {
  28  public:
  29   static const int kMaxDeviceNum = 128;
  30   ~DeviceDataManager() override;
  31
  32   static void CreateInstance();
  33   static DeviceDataManager* GetInstance();
  34   static bool HasInstance();
  35
  36   void ClearTouchTransformerRecord();
  37   void UpdateTouchInfoForDisplay(int64_t display_id,
  38                                  unsigned int touch_device_id,
  39                                  const gfx::Transform& touch_transformer);
  40   void ApplyTouchTransformer(unsigned int touch_device_id, float* x, float* y);
  41   int64_t GetDisplayForTouchDevice(unsigned int touch_device_id) const;
  42
  43   void UpdateTouchRadiusScale(unsigned int touch_device_id, double scale);
  44   void ApplyTouchRadiusScale(unsigned int touch_device_id, double* radius);
  45
  46   const std::vector<TouchscreenDevice>& touchscreen_devices() const {
  47     return touchscreen_devices_;
  48   }
  49
  50   const std::vector<KeyboardDevice>& keyboard_devices() const {
  51     return keyboard_devices_;
  52   }
  53
  54   void AddObserver(InputDeviceEventObserver* observer);
  55   void RemoveObserver(InputDeviceEventObserver* observer);
  56
  57  protected:
  58   DeviceDataManager();
  59
  60   static DeviceDataManager* instance();
  61
  62   // DeviceHotplugEventObserver:
  63   void OnTouchscreenDevicesUpdated(
  64       const std::vector<TouchscreenDevice>& devices) override;
  65   void OnKeyboardDevicesUpdated(
  66       const std::vector<KeyboardDevice>& devices) override;
  67
  68  private:
  69   static DeviceDataManager* instance_;
  70
  71   bool IsTouchDeviceIdValid(unsigned int touch_device_id) const;
  72
  73   double touch_radius_scale_map_[kMaxDeviceNum];
  74
  75   // Table to keep track of which display id is mapped to which touch device.
  76   int64_t touch_device_to_display_map_[kMaxDeviceNum];
  77   // Index table to find the TouchTransformer for a touch device.
  78   gfx::Transform touch_device_transformer_map_[kMaxDeviceNum];
  79
  80   std::vector<TouchscreenDevice> touchscreen_devices_;
  81   std::vector<KeyboardDevice> keyboard_devices_;
  82
  83   ObserverList<InputDeviceEventObserver> observers_;
  84
  85   DISALLOW_COPY_AND_ASSIGN(DeviceDataManager);
  86 };
  87
  88 }  // namespace ui
  89
  90 #endif  // UI_EVENTS_DEVICES_DEVICE_DATA_MANAGER_H_