ui/events/ozone/evdev/event_device_info.h

   1 // Copyright 2013 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_EVENT_DEVICE_INFO_H_
   6 #define UI_EVENTS_OZONE_EVDEV_EVENT_DEVICE_INFO_H_
   7
   8 #include <limits.h>
   9 #include <linux/input.h>
  10
  11 #include "base/basictypes.h"
  12 #include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
  13
  14 #define EVDEV_LONG_BITS (CHAR_BIT * sizeof(long))
  15 #define EVDEV_BITS_TO_LONGS(x) (((x) + EVDEV_LONG_BITS - 1) / EVDEV_LONG_BITS)
  16
  17 namespace ui {
  18
  19 // Device information for Linux input devices
  20 //
  21 // This stores and queries information about input devices; in
  22 // particular it knows which events the device can generate.
  23 class EVENTS_OZONE_EVDEV_EXPORT EventDeviceInfo {
  24  public:
  25   EventDeviceInfo();
  26   ~EventDeviceInfo();
  27
  28   // Initialize device information from an open device.
  29   bool Initialize(int fd);
  30
  31   // Check events this device can generate.
  32   bool HasEventType(unsigned int type) const;
  33   bool HasKeyEvent(unsigned int code) const;
  34   bool HasRelEvent(unsigned int code) const;
  35   bool HasAbsEvent(unsigned int code) const;
  36   bool HasMscEvent(unsigned int code) const;
  37   bool HasSwEvent(unsigned int code) const;
  38   bool HasLedEvent(unsigned int code) const;
  39
  40   // Properties of absolute axes.
  41   int32 GetAbsMinimum(unsigned int code) const;
  42   int32 GetAbsMaximum(unsigned int code) const;
  43
  44   // Check input device properties.
  45   bool HasProp(unsigned int code) const;
  46
  47   // Has absolute X & Y axes.
  48   bool HasAbsXY() const;
  49
  50   // Has relativeX & Y axes.
  51   bool HasRelXY() const;
  52
  53   // Determine whether absolute device X/Y coordinates are mapped onto the
  54   // screen. This is the case for touchscreens and tablets but not touchpads.
  55   bool IsMappedToScreen() const;
  56
  57  private:
  58   unsigned long ev_bits_[EVDEV_BITS_TO_LONGS(EV_CNT)];
  59   unsigned long key_bits_[EVDEV_BITS_TO_LONGS(KEY_CNT)];
  60   unsigned long rel_bits_[EVDEV_BITS_TO_LONGS(REL_CNT)];
  61   unsigned long abs_bits_[EVDEV_BITS_TO_LONGS(ABS_CNT)];
  62   unsigned long msc_bits_[EVDEV_BITS_TO_LONGS(MSC_CNT)];
  63   unsigned long sw_bits_[EVDEV_BITS_TO_LONGS(SW_CNT)];
  64   unsigned long led_bits_[EVDEV_BITS_TO_LONGS(LED_CNT)];
  65   unsigned long prop_bits_[EVDEV_BITS_TO_LONGS(INPUT_PROP_CNT)];
  66
  67   struct input_absinfo abs_info_[ABS_CNT];
  68
  69   DISALLOW_COPY_AND_ASSIGN(EventDeviceInfo);
  70 };
  71
  72 }  // namspace ui
  73
  74 #endif  // UI_EVENTS_OZONE_EVDEV_EVENT_DEVICE_INFO_H_