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/message_loop/message_pump_libevent.h"
  13 #include "ui/events/event_constants.h"
  14 #include "ui/events/ozone/evdev/event_converter_evdev.h"
  15 #include "ui/events/ozone/evdev/event_device_info.h"
  16 #include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
  17
  18 namespace ui {
  19
  20 class TouchEvent;
  21
  22 class EVENTS_OZONE_EVDEV_EXPORT TouchEventConverterEvdev
  23     : public EventConverterEvdev {
  24  public:
  25   enum {
  26     MAX_FINGERS = 11
  27   };
  28   TouchEventConverterEvdev(int fd,
  29                            base::FilePath path,
  30                            int id,
  31                            InputDeviceType type,
  32                            const EventDispatchCallback& dispatch);
  33   ~TouchEventConverterEvdev() override;
  34
  35   // EventConverterEvdev:
  36   bool HasTouchscreen() const override;
  37   gfx::Size GetTouchscreenSize() const override;
  38
  39   // Unsafe part of initialization.
  40   virtual void Initialize(const EventDeviceInfo& info);
  41
  42  private:
  43   friend class MockTouchEventConverterEvdev;
  44
  45   struct InProgressEvents {
  46     InProgressEvents();
  47
  48     float x_;
  49     float y_;
  50     int id_;  // Device reported "unique" touch point id; -1 means not active
  51     int finger_;  // "Finger" id starting from 0; -1 means not active
  52
  53     EventType type_;
  54     float radius_x_;
  55     float radius_y_;
  56     float pressure_;
  57   };
  58
  59   // Overidden from base::MessagePumpLibevent::Watcher.
  60   void OnFileCanReadWithoutBlocking(int fd) override;
  61
  62   virtual bool Reinitialize();
  63
  64   void ProcessInputEvent(const input_event& input);
  65   void ProcessAbs(const input_event& input);
  66   void ProcessSyn(const input_event& input);
  67
  68   void ReportEvent(int touch_id,
  69       const InProgressEvents& event, const base::TimeDelta& delta);
  70   void ReportEvents(base::TimeDelta delta);
  71
  72   // Callback for dispatching events.
  73   EventDispatchCallback callback_;
  74
  75   // Set if we have seen a SYN_DROPPED and not yet re-synced with the device.
  76   bool syn_dropped_;
  77
  78   // Set if this is a type A device (uses SYN_MT_REPORT).
  79   bool is_type_a_;
  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   // Size of the touchscreen as reported by the driver.
  94   gfx::Size native_size_;
  95
  96   // Touch point currently being updated from the /dev/input/event* stream.
  97   int current_slot_;
  98
  99   // Bit field tracking which in-progress touch points have been modified
 100   // without a syn event.
 101   std::bitset<MAX_FINGERS> altered_slots_;
 102
 103   // In-progress touch points.
 104   InProgressEvents events_[MAX_FINGERS];
 105
 106   DISALLOW_COPY_AND_ASSIGN(TouchEventConverterEvdev);
 107 };
 108
 109 }  // namespace ui
 110
 111 #endif  // UI_EVENTS_OZONE_EVDEV_TOUCH_EVENT_CONVERTER_EVDEV_H_