ui/events/ozone/evdev/touch_event_converter_evdev.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_OZONE_EVDEV_TOUCH_EVENT_CONVERTER_EVDEV_H_
   6 #define UI_EVENTS_OZONE_EVDEV_TOUCH_EVENT_CONVERTER_EVDEV_H_
   7
   8 #include <bitset>
   9
  10 #include "base/compiler_specific.h"
  11 #include "base/files/file_path.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/message_loop/message_pump_libevent.h"
  14 #include "ui/events/event_constants.h"
  15 #include "ui/events/ozone/evdev/event_converter_evdev.h"
  16 #include "ui/events/ozone/evdev/event_device_info.h"
  17 #include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
  18
  19 namespace ui {
  20
  21 class DeviceEventDispatcherEvdev;
  22 class TouchEvent;
  23 class TouchNoiseFinder;
  24 struct InProgressTouchEvdev;
  25
  26 class EVENTS_OZONE_EVDEV_EXPORT TouchEventConverterEvdev
  27     : public EventConverterEvdev {
  28  public:
  29   TouchEventConverterEvdev(int fd,
  30                            base::FilePath path,
  31                            int id,
  32                            InputDeviceType type,
  33                            DeviceEventDispatcherEvdev* dispatcher);
  34   ~TouchEventConverterEvdev() override;
  35
  36   // EventConverterEvdev:
  37   bool HasTouchscreen() const override;
  38   gfx::Size GetTouchscreenSize() const override;
  39   int GetTouchPoints() const override;
  40
  41   // Unsafe part of initialization.
  42   virtual void Initialize(const EventDeviceInfo& info);
  43
  44  private:
  45   friend class MockTouchEventConverterEvdev;
  46
  47   // Overidden from base::MessagePumpLibevent::Watcher.
  48   void OnFileCanReadWithoutBlocking(int fd) override;
  49
  50   virtual bool Reinitialize();
  51
  52   void ProcessMultitouchEvent(const input_event& input);
  53   void EmulateMultitouchEvent(const input_event& input);
  54   void ProcessKey(const input_event& input);
  55   void ProcessAbs(const input_event& input);
  56   void ProcessSyn(const input_event& input);
  57
  58   // Returns an EventType to dispatch for |touch|. Returns ET_UNKNOWN if an
  59   // event should not be dispatched.
  60   EventType GetEventTypeForTouch(const InProgressTouchEvdev& touch);
  61
  62   void ReportEvent(const InProgressTouchEvdev& event,
  63                    EventType event_type,
  64                    const base::TimeDelta& delta);
  65   void ReportEvents(base::TimeDelta delta);
  66
  67   // Normalize pressure value to [0, 1].
  68   float ScalePressure(int32_t value);
  69
  70   int NextTrackingId();
  71
  72   // Dispatcher for events.
  73   DeviceEventDispatcherEvdev* dispatcher_;
  74
  75   // Set if we have seen a SYN_DROPPED and not yet re-synced with the device.
  76   bool syn_dropped_;
  77
  78   // Device has multitouch capability.
  79   bool has_mt_;
  80
  81   // Pressure values.
  82   int pressure_min_;
  83   int pressure_max_;  // Used to normalize pressure values.
  84
  85   // Input range for x-axis.
  86   float x_min_tuxels_;
  87   float x_num_tuxels_;
  88
  89   // Input range for y-axis.
  90   float y_min_tuxels_;
  91   float y_num_tuxels_;
  92
  93   // Number of touch points reported by driver
  94   int touch_points_;
  95
  96   // Tracking id counter.
  97   int next_tracking_id_;
  98
  99   // Touch point currently being updated from the /dev/input/event* stream.
 100   size_t current_slot_;
 101
 102   // In-progress touch points.
 103   std::vector<InProgressTouchEvdev> events_;
 104
 105   // Finds touch noise.
 106   scoped_ptr<TouchNoiseFinder> touch_noise_finder_;
 107
 108   DISALLOW_COPY_AND_ASSIGN(TouchEventConverterEvdev);
 109 };
 110
 111 }  // namespace ui
 112
 113 #endif  // UI_EVENTS_OZONE_EVDEV_TOUCH_EVENT_CONVERTER_EVDEV_H_