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 DeviceEventDispatcherEvdev;
  23
  24 class EVENTS_OZONE_EVDEV_EXPORT TouchEventConverterEvdev
  25     : public EventConverterEvdev {
  26  public:
  27   enum { MAX_FINGERS = 20 };
  28   TouchEventConverterEvdev(int fd,
  29                            base::FilePath path,
  30                            int id,
  31                            InputDeviceType type,
  32                            DeviceEventDispatcherEvdev* dispatcher);
  33   ~TouchEventConverterEvdev() override;
  34
  35   // EventConverterEvdev:
  36   bool HasTouchscreen() const override;
  37   gfx::Size GetTouchscreenSize() const override;
  38   int GetTouchPoints() const override;
  39
  40   // Unsafe part of initialization.
  41   virtual void Initialize(const EventDeviceInfo& info);
  42
  43  private:
  44   friend class MockTouchEventConverterEvdev;
  45
  46   struct InProgressEvents {
  47     InProgressEvents();
  48
  49     bool altered_;
  50     float x_;
  51     float y_;
  52     int id_;  // Device reported "unique" touch point id; -1 means not active
  53     int finger_;  // "Finger" id starting from 0; -1 means not active
  54
  55     EventType type_;
  56     float radius_x_;
  57     float radius_y_;
  58     float pressure_;
  59   };
  60
  61   // Overidden from base::MessagePumpLibevent::Watcher.
  62   void OnFileCanReadWithoutBlocking(int fd) override;
  63
  64   virtual bool Reinitialize();
  65
  66   void ProcessInputEvent(const input_event& input);
  67   void ProcessAbs(const input_event& input);
  68   void ProcessSyn(const input_event& input);
  69
  70   void ReportEvent(int touch_id,
  71       const InProgressEvents& event, const base::TimeDelta& delta);
  72   void ReportEvents(base::TimeDelta delta);
  73
  74   // Dispatcher for events.
  75   DeviceEventDispatcherEvdev* dispatcher_;
  76
  77   // Set if we have seen a SYN_DROPPED and not yet re-synced with the device.
  78   bool syn_dropped_;
  79
  80   // Set if this is a type A device (uses SYN_MT_REPORT).
  81   bool is_type_a_;
  82
  83   // Pressure values.
  84   int pressure_min_;
  85   int pressure_max_;  // Used to normalize pressure values.
  86
  87   // Input range for x-axis.
  88   float x_min_tuxels_;
  89   float x_num_tuxels_;
  90
  91   // Input range for y-axis.
  92   float y_min_tuxels_;
  93   float y_num_tuxels_;
  94
  95   // Size of the touchscreen as reported by the driver.
  96   gfx::Size native_size_;
  97
  98   // Number of touch points reported by driver
  99   int touch_points_;
 100
 101   // Touch point currently being updated from the /dev/input/event* stream.
 102   size_t current_slot_;
 103
 104   // In-progress touch points.
 105   std::vector<InProgressEvents> events_;
 106
 107   DISALLOW_COPY_AND_ASSIGN(TouchEventConverterEvdev);
 108 };
 109
 110 }  // namespace ui
 111
 112 #endif  // UI_EVENTS_OZONE_EVDEV_TOUCH_EVENT_CONVERTER_EVDEV_H_