ui/events/ozone/evdev/event_modifiers_evdev.cc

   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 #include "ui/events/ozone/evdev/event_modifiers_evdev.h"
   6
   7 #include <linux/input.h>
   8
   9 #include "ui/events/event.h"
  10
  11 namespace ui {
  12
  13 namespace {
  14
  15 static const int kEventFlagFromModifiers[] = {
  16     EF_NONE,                 // EVDEV_MODIFIER_NONE,
  17     EF_CAPS_LOCK_DOWN,       // EVDEV_MODIFIER_CAPS_LOCK
  18     EF_SHIFT_DOWN,           // EVDEV_MODIFIER_SHIFT
  19     EF_CONTROL_DOWN,         // EVDEV_MODIFIER_CONTROL
  20     EF_ALT_DOWN,             // EVDEV_MODIFIER_ALT
  21     EF_LEFT_MOUSE_BUTTON,    // EVDEV_MODIFIER_LEFT_MOUSE_BUTTON
  22     EF_MIDDLE_MOUSE_BUTTON,  // EVDEV_MODIFIER_MIDDLE_MOUSE_BUTTON
  23     EF_RIGHT_MOUSE_BUTTON,   // EVDEV_MODIFIER_RIGHT_MOUSE_BUTTON
  24     EF_BACK_MOUSE_BUTTON,    // EVDEV_MODIFIER_BACK_MOUSE_BUTTON
  25     EF_FORWARD_MOUSE_BUTTON, // EVDEV_MODIFIER_FORWARD_MOUSE_BUTTON
  26     EF_COMMAND_DOWN,         // EVDEV_MODIFIER_COMMAND
  27     EF_ALTGR_DOWN,           // EVDEV_MODIFIER_ALTGR
  28     EF_MOD3_DOWN,            // EVDEV_MODIFIER_MOD3
  29 };
  30
  31 }  // namespace
  32
  33 EventModifiersEvdev::EventModifiersEvdev()
  34     : modifier_flags_locked_(0), modifier_flags_(0) {
  35   memset(modifiers_down_, 0, sizeof(modifiers_down_));
  36 }
  37 EventModifiersEvdev::~EventModifiersEvdev() {}
  38
  39 void EventModifiersEvdev::UpdateModifier(unsigned int modifier, bool down) {
  40   DCHECK_LT(modifier, EVDEV_NUM_MODIFIERS);
  41
  42   if (down) {
  43     modifiers_down_[modifier]++;
  44   } else {
  45     // Ignore spurious modifier "up" events. This might happen if the
  46     // button is down during startup.
  47     if (modifiers_down_[modifier])
  48       modifiers_down_[modifier]--;
  49   }
  50
  51   UpdateFlags(modifier);
  52 }
  53
  54 void EventModifiersEvdev::UpdateModifierLock(unsigned int modifier, bool down) {
  55   DCHECK_LT(modifier, EVDEV_NUM_MODIFIERS);
  56
  57   if (down)
  58     modifier_flags_locked_ ^= kEventFlagFromModifiers[modifier];
  59
  60   UpdateFlags(modifier);
  61 }
  62
  63 void EventModifiersEvdev::SetModifierLock(unsigned int modifier, bool locked) {
  64   DCHECK_LT(modifier, EVDEV_NUM_MODIFIERS);
  65
  66   if (locked)
  67     modifier_flags_locked_ |= kEventFlagFromModifiers[modifier];
  68   else
  69     modifier_flags_locked_ &= ~kEventFlagFromModifiers[modifier];
  70
  71   UpdateFlags(modifier);
  72 }
  73
  74 void EventModifiersEvdev::UpdateFlags(unsigned int modifier) {
  75   int mask = kEventFlagFromModifiers[modifier];
  76   bool down = modifiers_down_[modifier];
  77   bool locked = (modifier_flags_locked_ & mask);
  78   if (down != locked)
  79     modifier_flags_ |= mask;
  80   else
  81     modifier_flags_ &= ~mask;
  82 }
  83
  84 int EventModifiersEvdev::GetModifierFlags() { return modifier_flags_; }
  85
  86 // static
  87 int EventModifiersEvdev::GetEventFlagFromModifier(unsigned int modifier) {
  88   return kEventFlagFromModifiers[modifier];
  89 }
  90
  91 }  // namespace ui