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 DCHECK_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 DCHECK_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 80
