Sync ui/events to chromium @ https://codereview.chromium.org/1210203002

ui/events/ozone/evdev/event_modifiers_evdev.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/events/ozone/evdev/event_modifiers_evdev.h"
+
+#include <linux/input.h>
+
+#include "ui/events/event.h"
+
+namespace ui {
+
+namespace {
+
+static const int kEventFlagFromModifiers[] = {
+    EF_NONE,                 // EVDEV_MODIFIER_NONE,
+    EF_CAPS_LOCK_DOWN,       // EVDEV_MODIFIER_CAPS_LOCK
+    EF_SHIFT_DOWN,           // EVDEV_MODIFIER_SHIFT
+    EF_CONTROL_DOWN,         // EVDEV_MODIFIER_CONTROL
+    EF_ALT_DOWN,             // EVDEV_MODIFIER_ALT
+    EF_LEFT_MOUSE_BUTTON,    // EVDEV_MODIFIER_LEFT_MOUSE_BUTTON
+    EF_MIDDLE_MOUSE_BUTTON,  // EVDEV_MODIFIER_MIDDLE_MOUSE_BUTTON
+    EF_RIGHT_MOUSE_BUTTON,   // EVDEV_MODIFIER_RIGHT_MOUSE_BUTTON
+    EF_BACK_MOUSE_BUTTON,    // EVDEV_MODIFIER_BACK_MOUSE_BUTTON
+    EF_FORWARD_MOUSE_BUTTON, // EVDEV_MODIFIER_FORWARD_MOUSE_BUTTON
+    EF_COMMAND_DOWN,         // EVDEV_MODIFIER_COMMAND
+    EF_ALTGR_DOWN,           // EVDEV_MODIFIER_ALTGR
+    EF_MOD3_DOWN,            // EVDEV_MODIFIER_MOD3
+};
+
+}  // namespace
+
+EventModifiersEvdev::EventModifiersEvdev() {
+  memset(modifiers_down_, 0, sizeof(modifiers_down_));
+}
+EventModifiersEvdev::~EventModifiersEvdev() {}
+
+void EventModifiersEvdev::UpdateModifier(unsigned int modifier, bool down) {
+  DCHECK_LT(modifier, EVDEV_NUM_MODIFIERS);
+
+  if (down) {
+    modifiers_down_[modifier]++;
+  } else {
+    // Ignore spurious modifier "up" events. This might happen if the
+    // button is down during startup.
+    if (modifiers_down_[modifier])
+      modifiers_down_[modifier]--;
+  }
+
+  UpdateFlags(modifier);
+}
+
+void EventModifiersEvdev::UpdateModifierLock(unsigned int modifier, bool down) {
+  DCHECK_LT(modifier, EVDEV_NUM_MODIFIERS);
+
+  if (down)
+    modifier_flags_locked_ ^= kEventFlagFromModifiers[modifier];
+
+  UpdateFlags(modifier);
+}
+
+void EventModifiersEvdev::SetModifierLock(unsigned int modifier, bool locked) {
+  DCHECK_LT(modifier, EVDEV_NUM_MODIFIERS);
+
+  if (locked)
+    modifier_flags_locked_ |= kEventFlagFromModifiers[modifier];
+  else
+    modifier_flags_locked_ &= ~kEventFlagFromModifiers[modifier];
+
+  UpdateFlags(modifier);
+}
+
+void EventModifiersEvdev::UpdateFlags(unsigned int modifier) {
+  int mask = kEventFlagFromModifiers[modifier];
+  bool down = modifiers_down_[modifier];
+  bool locked = (modifier_flags_locked_ & mask);
+  if (down != locked)
+    modifier_flags_ |= mask;
+  else
+    modifier_flags_ &= ~mask;
+}
+
+int EventModifiersEvdev::GetModifierFlags() { return modifier_flags_; }
+
+// static
+int EventModifiersEvdev::GetEventFlagFromModifier(unsigned int modifier) {
+  return kEventFlagFromModifiers[modifier];
+}
+
+}  // namespace ui