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_COMMAND_DOWN,         // EVDEV_MODIFIER_COMMAND
  25     EF_ALTGR_DOWN,           // EVDEV_MODIFIER_ALTGR
  26 };
  27
  28 }  // namespace
  29
  30 EventModifiersEvdev::EventModifiersEvdev()
  31     : modifier_flags_locked_(0), modifier_flags_(0) {
  32   memset(modifiers_down_, 0, sizeof(modifiers_down_));
  33 }
  34 EventModifiersEvdev::~EventModifiersEvdev() {}
  35
  36 void EventModifiersEvdev::UpdateModifier(unsigned int modifier, bool down) {
  37   CHECK_LT(modifier, EVDEV_NUM_MODIFIERS);
  38
  39   if (down) {
  40     modifiers_down_[modifier]++;
  41   } else {
  42     // Ignore spurious modifier "up" events. This might happen if the
  43     // button is down during startup.
  44     if (modifiers_down_[modifier])
  45       modifiers_down_[modifier]--;
  46   }
  47
  48   UpdateFlags(modifier);
  49 }
  50
  51 void EventModifiersEvdev::UpdateModifierLock(unsigned int modifier, bool down) {
  52   CHECK_LT(modifier, EVDEV_NUM_MODIFIERS);
  53
  54   if (down)
  55     modifier_flags_locked_ ^= kEventFlagFromModifiers[modifier];
  56
  57   // TODO(spang): Synchronize with the CapsLock LED.
  58
  59   UpdateFlags(modifier);
  60 }
  61
  62 void EventModifiersEvdev::UpdateFlags(unsigned int modifier) {
  63   int mask = kEventFlagFromModifiers[modifier];
  64   bool down = modifiers_down_[modifier];
  65   bool locked = (modifier_flags_locked_ & mask);
  66   if (down != locked)
  67     modifier_flags_ |= mask;
  68   else
  69     modifier_flags_ &= ~mask;
  70 }
  71
  72 int EventModifiersEvdev::GetModifierFlags() { return modifier_flags_; }
  73
  74 // static
  75 int EventModifiersEvdev::GetEventFlagFromModifier(unsigned int modifier) {
  76   return kEventFlagFromModifiers[modifier];
  77 }
  78
  79 }  // namespace ui