Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2491 insertions, 0 deletions

diff --git a/widget/gtk/nsGtkKeyUtils.cpp b/widget/gtk/nsGtkKeyUtils.cpp
new file mode 100644
index 0000000000..4a83ea6ec0
--- /dev/null
+++ b/widget/gtk/nsGtkKeyUtils.cpp
@@ -0,0 +1,2491 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:expandtab:shiftwidth=4:tabstop=4:
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/Logging.h"
+
+#include "nsGtkKeyUtils.h"
+
+#include <gdk/gdkkeysyms.h>
+#include <algorithm>
+#include <gdk/gdk.h>
+#include <dlfcn.h>
+#include <gdk/gdkkeysyms-compat.h>
+#ifdef MOZ_X11
+#  include <gdk/gdkx.h>
+#  include <X11/XKBlib.h>
+#  include "X11UndefineNone.h"
+#endif
+#include "IMContextWrapper.h"
+#include "WidgetUtils.h"
+#include "WidgetUtilsGtk.h"
+#include "x11/keysym2ucs.h"
+#include "nsContentUtils.h"
+#include "nsGtkUtils.h"
+#include "nsIBidiKeyboard.h"
+#include "nsPrintfCString.h"
+#include "nsReadableUtils.h"
+#include "nsServiceManagerUtils.h"
+#include "nsWindow.h"
+
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/MouseEvents.h"
+#include "mozilla/TextEventDispatcher.h"
+#include "mozilla/TextEvents.h"
+
+#ifdef MOZ_WAYLAND
+#  include <sys/mman.h>
+#  include "nsWaylandDisplay.h"
+#endif
+
+// For collecting other people's log, tell them `MOZ_LOG=KeyboardHandler:4,sync`
+// rather than `MOZ_LOG=KeyboardHandler:5,sync` since using `5` may create too
+// big file.
+// Therefore you shouldn't use `LogLevel::Verbose` for logging usual behavior.
+mozilla::LazyLogModule gKeyLog("KeyboardHandler");
+
+namespace mozilla {
+namespace widget {
+
+#define IS_ASCII_ALPHABETICAL(key) \
+  ((('a' <= key) && (key <= 'z')) || (('A' <= key) && (key <= 'Z')))
+
+#define MOZ_MODIFIER_KEYS "MozKeymapWrapper"
+
+KeymapWrapper* KeymapWrapper::sInstance = nullptr;
+guint KeymapWrapper::sLastRepeatableHardwareKeyCode = 0;
+#ifdef MOZ_X11
+Time KeymapWrapper::sLastRepeatableKeyTime = 0;
+#endif
+KeymapWrapper::RepeatState KeymapWrapper::sRepeatState =
+    KeymapWrapper::NOT_PRESSED;
+
+#ifdef MOZ_WAYLAND
+wl_seat* KeymapWrapper::sSeat = nullptr;
+int KeymapWrapper::sSeatID = -1;
+wl_keyboard* KeymapWrapper::sKeyboard = nullptr;
+#endif
+
+static const char* GetBoolName(bool aBool) { return aBool ? "TRUE" : "FALSE"; }
+
+static const char* GetStatusName(nsEventStatus aStatus) {
+  switch (aStatus) {
+    case nsEventStatus_eConsumeDoDefault:
+      return "nsEventStatus_eConsumeDoDefault";
+    case nsEventStatus_eConsumeNoDefault:
+      return "nsEventStatus_eConsumeNoDefault";
+    case nsEventStatus_eIgnore:
+      return "nsEventStatus_eIgnore";
+    case nsEventStatus_eSentinel:
+      return "nsEventStatus_eSentinel";
+    default:
+      return "Illegal value";
+  }
+}
+
+static const nsCString GetKeyLocationName(uint32_t aLocation) {
+  switch (aLocation) {
+    case eKeyLocationLeft:
+      return "KEY_LOCATION_LEFT"_ns;
+    case eKeyLocationRight:
+      return "KEY_LOCATION_RIGHT"_ns;
+    case eKeyLocationStandard:
+      return "KEY_LOCATION_STANDARD"_ns;
+    case eKeyLocationNumpad:
+      return "KEY_LOCATION_NUMPAD"_ns;
+    default:
+      return nsPrintfCString("Unknown (0x%04X)", aLocation);
+  }
+}
+
+static const nsCString GetCharacterCodeName(char16_t aChar) {
+  switch (aChar) {
+    case 0x0000:
+      return "NULL (0x0000)"_ns;
+    case 0x0008:
+      return "BACKSPACE (0x0008)"_ns;
+    case 0x0009:
+      return "CHARACTER TABULATION (0x0009)"_ns;
+    case 0x000A:
+      return "LINE FEED (0x000A)"_ns;
+    case 0x000B:
+      return "LINE TABULATION (0x000B)"_ns;
+    case 0x000C:
+      return "FORM FEED (0x000C)"_ns;
+    case 0x000D:
+      return "CARRIAGE RETURN (0x000D)"_ns;
+    case 0x0018:
+      return "CANCEL (0x0018)"_ns;
+    case 0x001B:
+      return "ESCAPE (0x001B)"_ns;
+    case 0x0020:
+      return "SPACE (0x0020)"_ns;
+    case 0x007F:
+      return "DELETE (0x007F)"_ns;
+    case 0x00A0:
+      return "NO-BREAK SPACE (0x00A0)"_ns;
+    case 0x00AD:
+      return "SOFT HYPHEN (0x00AD)"_ns;
+    case 0x2000:
+      return "EN QUAD (0x2000)"_ns;
+    case 0x2001:
+      return "EM QUAD (0x2001)"_ns;
+    case 0x2002:
+      return "EN SPACE (0x2002)"_ns;
+    case 0x2003:
+      return "EM SPACE (0x2003)"_ns;
+    case 0x2004:
+      return "THREE-PER-EM SPACE (0x2004)"_ns;
+    case 0x2005:
+      return "FOUR-PER-EM SPACE (0x2005)"_ns;
+    case 0x2006:
+      return "SIX-PER-EM SPACE (0x2006)"_ns;
+    case 0x2007:
+      return "FIGURE SPACE (0x2007)"_ns;
+    case 0x2008:
+      return "PUNCTUATION SPACE (0x2008)"_ns;
+    case 0x2009:
+      return "THIN SPACE (0x2009)"_ns;
+    case 0x200A:
+      return "HAIR SPACE (0x200A)"_ns;
+    case 0x200B:
+      return "ZERO WIDTH SPACE (0x200B)"_ns;
+    case 0x200C:
+      return "ZERO WIDTH NON-JOINER (0x200C)"_ns;
+    case 0x200D:
+      return "ZERO WIDTH JOINER (0x200D)"_ns;
+    case 0x200E:
+      return "LEFT-TO-RIGHT MARK (0x200E)"_ns;
+    case 0x200F:
+      return "RIGHT-TO-LEFT MARK (0x200F)"_ns;
+    case 0x2029:
+      return "PARAGRAPH SEPARATOR (0x2029)"_ns;
+    case 0x202A:
+      return "LEFT-TO-RIGHT EMBEDDING (0x202A)"_ns;
+    case 0x202B:
+      return "RIGHT-TO-LEFT EMBEDDING (0x202B)"_ns;
+    case 0x202D:
+      return "LEFT-TO-RIGHT OVERRIDE (0x202D)"_ns;
+    case 0x202E:
+      return "RIGHT-TO-LEFT OVERRIDE (0x202E)"_ns;
+    case 0x202F:
+      return "NARROW NO-BREAK SPACE (0x202F)"_ns;
+    case 0x205F:
+      return "MEDIUM MATHEMATICAL SPACE (0x205F)"_ns;
+    case 0x2060:
+      return "WORD JOINER (0x2060)"_ns;
+    case 0x2066:
+      return "LEFT-TO-RIGHT ISOLATE (0x2066)"_ns;
+    case 0x2067:
+      return "RIGHT-TO-LEFT ISOLATE (0x2067)"_ns;
+    case 0x3000:
+      return "IDEOGRAPHIC SPACE (0x3000)"_ns;
+    case 0xFEFF:
+      return "ZERO WIDTH NO-BREAK SPACE (0xFEFF)"_ns;
+    default: {
+      if (aChar < ' ' || (aChar >= 0x80 && aChar < 0xA0)) {
+        return nsPrintfCString("control (0x%04X)", aChar);
+      }
+      if (NS_IS_HIGH_SURROGATE(aChar)) {
+        return nsPrintfCString("high surrogate (0x%04X)", aChar);
+      }
+      if (NS_IS_LOW_SURROGATE(aChar)) {
+        return nsPrintfCString("low surrogate (0x%04X)", aChar);
+      }
+      return nsPrintfCString("'%s' (0x%04X)",
+                             NS_ConvertUTF16toUTF8(nsAutoString(aChar)).get(),
+                             aChar);
+    }
+  }
+}
+
+static const nsCString GetCharacterCodeNames(const char16_t* aChars,
+                                             uint32_t aLength) {
+  if (!aLength) {
+    return "\"\""_ns;
+  }
+  nsCString result;
+  result.AssignLiteral("\"");
+  StringJoinAppend(result, ", "_ns, Span{aChars, aLength},
+                   [](nsACString& dest, const char16_t charValue) {
+                     dest.Append(GetCharacterCodeName(charValue));
+                   });
+  result.AppendLiteral("\"");
+  return result;
+}
+
+static const nsCString GetCharacterCodeNames(const nsAString& aString) {
+  return GetCharacterCodeNames(aString.BeginReading(), aString.Length());
+}
+
+/* static */ const char* KeymapWrapper::GetModifierName(Modifier aModifier) {
+  switch (aModifier) {
+    case CAPS_LOCK:
+      return "CapsLock";
+    case NUM_LOCK:
+      return "NumLock";
+    case SCROLL_LOCK:
+      return "ScrollLock";
+    case SHIFT:
+      return "Shift";
+    case CTRL:
+      return "Ctrl";
+    case ALT:
+      return "Alt";
+    case SUPER:
+      return "Super";
+    case HYPER:
+      return "Hyper";
+    case META:
+      return "Meta";
+    case LEVEL3:
+      return "Level3";
+    case LEVEL5:
+      return "Level5";
+    case NOT_MODIFIER:
+      return "NotModifier";
+    default:
+      return "InvalidValue";
+  }
+}
+
+/* static */ KeymapWrapper::Modifier KeymapWrapper::GetModifierForGDKKeyval(
+    guint aGdkKeyval) {
+  switch (aGdkKeyval) {
+    case GDK_Caps_Lock:
+      return CAPS_LOCK;
+    case GDK_Num_Lock:
+      return NUM_LOCK;
+    case GDK_Scroll_Lock:
+      return SCROLL_LOCK;
+    case GDK_Shift_Lock:
+    case GDK_Shift_L:
+    case GDK_Shift_R:
+      return SHIFT;
+    case GDK_Control_L:
+    case GDK_Control_R:
+      return CTRL;
+    case GDK_Alt_L:
+    case GDK_Alt_R:
+      return ALT;
+    case GDK_Super_L:
+    case GDK_Super_R:
+      return SUPER;
+    case GDK_Hyper_L:
+    case GDK_Hyper_R:
+      return HYPER;
+    case GDK_Meta_L:
+    case GDK_Meta_R:
+      return META;
+    case GDK_ISO_Level3_Shift:
+    case GDK_Mode_switch:
+      return LEVEL3;
+    case GDK_ISO_Level5_Shift:
+      return LEVEL5;
+    default:
+      return NOT_MODIFIER;
+  }
+}
+
+guint KeymapWrapper::GetModifierMask(Modifier aModifier) const {
+  switch (aModifier) {
+    case CAPS_LOCK:
+      return GDK_LOCK_MASK;
+    case NUM_LOCK:
+      return mModifierMasks[INDEX_NUM_LOCK];
+    case SCROLL_LOCK:
+      return mModifierMasks[INDEX_SCROLL_LOCK];
+    case SHIFT:
+      return GDK_SHIFT_MASK;
+    case CTRL:
+      return GDK_CONTROL_MASK;
+    case ALT:
+      return mModifierMasks[INDEX_ALT];
+    case SUPER:
+      return mModifierMasks[INDEX_SUPER];
+    case HYPER:
+      return mModifierMasks[INDEX_HYPER];
+    case META:
+      return mModifierMasks[INDEX_META];
+    case LEVEL3:
+      return mModifierMasks[INDEX_LEVEL3];
+    case LEVEL5:
+      return mModifierMasks[INDEX_LEVEL5];
+    default:
+      return 0;
+  }
+}
+
+KeymapWrapper::ModifierKey* KeymapWrapper::GetModifierKey(
+    guint aHardwareKeycode) {
+  for (uint32_t i = 0; i < mModifierKeys.Length(); i++) {
+    ModifierKey& key = mModifierKeys[i];
+    if (key.mHardwareKeycode == aHardwareKeycode) {
+      return &key;
+    }
+  }
+  return nullptr;
+}
+
+/* static */
+KeymapWrapper* KeymapWrapper::GetInstance() {
+  if (!sInstance) {
+    sInstance = new KeymapWrapper();
+    sInstance->Init();
+  }
+  return sInstance;
+}
+
+#ifdef MOZ_WAYLAND
+void KeymapWrapper::EnsureInstance() { (void)GetInstance(); }
+
+void KeymapWrapper::InitBySystemSettingsWayland() {
+  MOZ_UNUSED(WaylandDisplayGet());
+}
+#endif
+
+/* static */
+void KeymapWrapper::Shutdown() {
+  if (sInstance) {
+    delete sInstance;
+    sInstance = nullptr;
+  }
+}
+
+KeymapWrapper::KeymapWrapper()
+    : mInitialized(false),
+      mGdkKeymap(gdk_keymap_get_default()),
+      mXKBBaseEventCode(0),
+      mOnKeysChangedSignalHandle(0),
+      mOnDirectionChangedSignalHandle(0) {
+  MOZ_LOG(gKeyLog, LogLevel::Info,
+          ("%p Constructor, mGdkKeymap=%p", this, mGdkKeymap));
+
+  g_object_ref(mGdkKeymap);
+
+#ifdef MOZ_X11
+  if (GdkIsX11Display()) {
+    InitXKBExtension();
+  }
+#endif
+}
+
+void KeymapWrapper::Init() {
+  if (mInitialized) {
+    return;
+  }
+  mInitialized = true;
+
+  MOZ_LOG(gKeyLog, LogLevel::Info,
+          ("%p Init, mGdkKeymap=%p", this, mGdkKeymap));
+
+  mModifierKeys.Clear();
+  memset(mModifierMasks, 0, sizeof(mModifierMasks));
+
+#ifdef MOZ_X11
+  if (GdkIsX11Display()) {
+    InitBySystemSettingsX11();
+  }
+#endif
+#ifdef MOZ_WAYLAND
+  if (GdkIsWaylandDisplay()) {
+    InitBySystemSettingsWayland();
+  }
+#endif
+
+#ifdef MOZ_X11
+  gdk_window_add_filter(nullptr, FilterEvents, this);
+#endif
+
+  MOZ_LOG(gKeyLog, LogLevel::Info,
+          ("%p Init, CapsLock=0x%X, NumLock=0x%X, "
+           "ScrollLock=0x%X, Level3=0x%X, Level5=0x%X, "
+           "Shift=0x%X, Ctrl=0x%X, Alt=0x%X, Meta=0x%X, Super=0x%X, Hyper=0x%X",
+           this, GetModifierMask(CAPS_LOCK), GetModifierMask(NUM_LOCK),
+           GetModifierMask(SCROLL_LOCK), GetModifierMask(LEVEL3),
+           GetModifierMask(LEVEL5), GetModifierMask(SHIFT),
+           GetModifierMask(CTRL), GetModifierMask(ALT), GetModifierMask(META),
+           GetModifierMask(SUPER), GetModifierMask(HYPER)));
+}
+
+#ifdef MOZ_X11
+void KeymapWrapper::InitXKBExtension() {
+  PodZero(&mKeyboardState);
+
+  int xkbMajorVer = XkbMajorVersion;
+  int xkbMinorVer = XkbMinorVersion;
+  if (!XkbLibraryVersion(&xkbMajorVer, &xkbMinorVer)) {
+    MOZ_LOG(gKeyLog, LogLevel::Info,
+            ("%p InitXKBExtension failed due to failure of "
+             "XkbLibraryVersion()",
+             this));
+    return;
+  }
+
+  Display* display = gdk_x11_display_get_xdisplay(gdk_display_get_default());
+
+  // XkbLibraryVersion() set xkbMajorVer and xkbMinorVer to that of the
+  // library, which may be newer than what is required of the server in
+  // XkbQueryExtension(), so these variables should be reset to
+  // XkbMajorVersion and XkbMinorVersion before the XkbQueryExtension call.
+  xkbMajorVer = XkbMajorVersion;
+  xkbMinorVer = XkbMinorVersion;
+  int opcode, baseErrorCode;
+  if (!XkbQueryExtension(display, &opcode, &mXKBBaseEventCode, &baseErrorCode,
+                         &xkbMajorVer, &xkbMinorVer)) {
+    MOZ_LOG(gKeyLog, LogLevel::Info,
+            ("%p   InitXKBExtension failed due to failure of "
+             "XkbQueryExtension(), display=0x%p",
+             this, display));
+    return;
+  }
+
+  if (!XkbSelectEventDetails(display, XkbUseCoreKbd, XkbStateNotify,
+                             XkbModifierStateMask, XkbModifierStateMask)) {
+    MOZ_LOG(gKeyLog, LogLevel::Info,
+            ("%p   InitXKBExtension failed due to failure of "
+             "XkbSelectEventDetails() for XModifierStateMask, display=0x%p",
+             this, display));
+    return;
+  }
+
+  if (!XkbSelectEventDetails(display, XkbUseCoreKbd, XkbControlsNotify,
+                             XkbPerKeyRepeatMask, XkbPerKeyRepeatMask)) {
+    MOZ_LOG(gKeyLog, LogLevel::Info,
+            ("%p   InitXKBExtension failed due to failure of "
+             "XkbSelectEventDetails() for XkbControlsNotify, display=0x%p",
+             this, display));
+    return;
+  }
+
+  if (!XGetKeyboardControl(display, &mKeyboardState)) {
+    MOZ_LOG(gKeyLog, LogLevel::Info,
+            ("%p   InitXKBExtension failed due to failure of "
+             "XGetKeyboardControl(), display=0x%p",
+             this, display));
+    return;
+  }
+
+  MOZ_LOG(gKeyLog, LogLevel::Info, ("%p   InitXKBExtension, Succeeded", this));
+}
+
+void KeymapWrapper::InitBySystemSettingsX11() {
+  MOZ_LOG(gKeyLog, LogLevel::Info,
+          ("%p InitBySystemSettingsX11, mGdkKeymap=%p", this, mGdkKeymap));
+
+  if (!mOnKeysChangedSignalHandle) {
+    mOnKeysChangedSignalHandle = g_signal_connect(
+        mGdkKeymap, "keys-changed", (GCallback)OnKeysChanged, this);
+  }
+  if (!mOnDirectionChangedSignalHandle) {
+    mOnDirectionChangedSignalHandle = g_signal_connect(
+        mGdkKeymap, "direction-changed", (GCallback)OnDirectionChanged, this);
+  }
+
+  Display* display = gdk_x11_display_get_xdisplay(gdk_display_get_default());
+
+  int min_keycode = 0;
+  int max_keycode = 0;
+  XDisplayKeycodes(display, &min_keycode, &max_keycode);
+
+  int keysyms_per_keycode = 0;
+  KeySym* xkeymap =
+      XGetKeyboardMapping(display, min_keycode, max_keycode - min_keycode + 1,
+                          &keysyms_per_keycode);
+  if (!xkeymap) {
+    MOZ_LOG(gKeyLog, LogLevel::Info,
+            ("%p   InitBySystemSettings, "
+             "Failed due to null xkeymap",
+             this));
+    return;
+  }
+
+  XModifierKeymap* xmodmap = XGetModifierMapping(display);
+  if (!xmodmap) {
+    MOZ_LOG(gKeyLog, LogLevel::Info,
+            ("%p   InitBySystemSettings, "
+             "Failed due to null xmodmap",
+             this));
+    XFree(xkeymap);
+    return;
+  }
+  MOZ_LOG(gKeyLog, LogLevel::Info,
+          ("%p   InitBySystemSettings, min_keycode=%d, "
+           "max_keycode=%d, keysyms_per_keycode=%d, max_keypermod=%d",
+           this, min_keycode, max_keycode, keysyms_per_keycode,
+           xmodmap->max_keypermod));
+
+  // The modifiermap member of the XModifierKeymap structure contains 8 sets
+  // of max_keypermod KeyCodes, one for each modifier in the order Shift,
+  // Lock, Control, Mod1, Mod2, Mod3, Mod4, and Mod5.
+  // Only nonzero KeyCodes have meaning in each set, and zero KeyCodes are
+  // ignored.
+
+  // Note that two or more modifiers may use one modifier flag.  E.g.,
+  // on Ubuntu 10.10, Alt and Meta share the Mod1 in default settings.
+  // And also Super and Hyper share the Mod4. In such cases, we need to
+  // decide which modifier flag means one of DOM modifiers.
+
+  // mod[0] is Modifier introduced by Mod1.
+  Modifier mod[5];
+  int32_t foundLevel[5];
+  for (uint32_t i = 0; i < ArrayLength(mod); i++) {
+    mod[i] = NOT_MODIFIER;
+    foundLevel[i] = INT32_MAX;
+  }
+  const uint32_t map_size = 8 * xmodmap->max_keypermod;
+  for (uint32_t i = 0; i < map_size; i++) {
+    KeyCode keycode = xmodmap->modifiermap[i];
+    MOZ_LOG(gKeyLog, LogLevel::Info,
+            ("%p   InitBySystemSettings, "
+             "  i=%d, keycode=0x%08X",
+             this, i, keycode));
+    if (!keycode || keycode < min_keycode || keycode > max_keycode) {
+      continue;
+    }
+
+    ModifierKey* modifierKey = GetModifierKey(keycode);
+    if (!modifierKey) {
+      modifierKey = mModifierKeys.AppendElement(ModifierKey(keycode));
+    }
+
+    const KeySym* syms =
+        xkeymap + (keycode - min_keycode) * keysyms_per_keycode;
+    const uint32_t bit = i / xmodmap->max_keypermod;
+    modifierKey->mMask |= 1 << bit;
+
+    // We need to know the meaning of Mod1, Mod2, Mod3, Mod4 and Mod5.
+    // Let's skip if current map is for others.
+    if (bit < 3) {
+      continue;
+    }
+
+    const int32_t modIndex = bit - 3;
+    for (int32_t j = 0; j < keysyms_per_keycode; j++) {
+      Modifier modifier = GetModifierForGDKKeyval(syms[j]);
+      MOZ_LOG(gKeyLog, LogLevel::Info,
+              ("%p   InitBySystemSettings, "
+               "    Mod%d, j=%d, syms[j]=%s(0x%lX), modifier=%s",
+               this, modIndex + 1, j, gdk_keyval_name(syms[j]), syms[j],
+               GetModifierName(modifier)));
+
+      switch (modifier) {
+        case NOT_MODIFIER:
+          // Don't overwrite the stored information with
+          // NOT_MODIFIER.
+          break;
+        case CAPS_LOCK:
+        case SHIFT:
+        case CTRL:
+          // Ignore the modifiers defined in GDK spec. They shouldn't
+          // be mapped to Mod1-5 because they must not work on native
+          // GTK applications.
+          break;
+        default:
+          // If new modifier is found in higher level than stored
+          // value, we don't need to overwrite it.
+          if (j > foundLevel[modIndex]) {
+            break;
+          }
+          // If new modifier is more important than stored value,
+          // we should overwrite it with new modifier.
+          if (j == foundLevel[modIndex]) {
+            mod[modIndex] = std::min(modifier, mod[modIndex]);
+            break;
+          }
+          foundLevel[modIndex] = j;
+          mod[modIndex] = modifier;
+          break;
+      }
+    }
+  }
+
+  for (uint32_t i = 0; i < COUNT_OF_MODIFIER_INDEX; i++) {
+    Modifier modifier;
+    switch (i) {
+      case INDEX_NUM_LOCK:
+        modifier = NUM_LOCK;
+        break;
+      case INDEX_SCROLL_LOCK:
+        modifier = SCROLL_LOCK;
+        break;
+      case INDEX_ALT:
+        modifier = ALT;
+        break;
+      case INDEX_META:
+        modifier = META;
+        break;
+      case INDEX_SUPER:
+        modifier = SUPER;
+        break;
+      case INDEX_HYPER:
+        modifier = HYPER;
+        break;
+      case INDEX_LEVEL3:
+        modifier = LEVEL3;
+        break;
+      case INDEX_LEVEL5:
+        modifier = LEVEL5;
+        break;
+      default:
+        MOZ_CRASH("All indexes must be handled here");
+    }
+    for (uint32_t j = 0; j < ArrayLength(mod); j++) {
+      if (modifier == mod[j]) {
+        mModifierMasks[i] |= 1 << (j + 3);
+      }
+    }
+  }
+
+  XFreeModifiermap(xmodmap);
+  XFree(xkeymap);
+}
+#endif
+
+#ifdef MOZ_WAYLAND
+void KeymapWrapper::SetModifierMask(xkb_keymap* aKeymap,
+                                    ModifierIndex aModifierIndex,
+                                    const char* aModifierName) {
+  static auto sXkbKeymapModGetIndex =
+      (xkb_mod_index_t(*)(struct xkb_keymap*, const char*))dlsym(
+          RTLD_DEFAULT, "xkb_keymap_mod_get_index");
+
+  xkb_mod_index_t index = sXkbKeymapModGetIndex(aKeymap, aModifierName);
+  if (index != XKB_MOD_INVALID) {
+    mModifierMasks[aModifierIndex] = (1 << index);
+  }
+}
+
+void KeymapWrapper::SetModifierMasks(xkb_keymap* aKeymap) {
+  KeymapWrapper* keymapWrapper = GetInstance();
+
+  // This mapping is derived from get_xkb_modifiers() at gdkkeys-wayland.c
+  keymapWrapper->SetModifierMask(aKeymap, INDEX_NUM_LOCK, XKB_MOD_NAME_NUM);
+  keymapWrapper->SetModifierMask(aKeymap, INDEX_ALT, XKB_MOD_NAME_ALT);
+  keymapWrapper->SetModifierMask(aKeymap, INDEX_META, "Meta");
+  keymapWrapper->SetModifierMask(aKeymap, INDEX_SUPER, "Super");
+  keymapWrapper->SetModifierMask(aKeymap, INDEX_HYPER, "Hyper");
+
+  keymapWrapper->SetModifierMask(aKeymap, INDEX_SCROLL_LOCK, "ScrollLock");
+  keymapWrapper->SetModifierMask(aKeymap, INDEX_LEVEL3, "Level3");
+  keymapWrapper->SetModifierMask(aKeymap, INDEX_LEVEL5, "Level5");
+
+  MOZ_LOG(gKeyLog, LogLevel::Info,
+          ("%p KeymapWrapper::SetModifierMasks, CapsLock=0x%X, NumLock=0x%X, "
+           "ScrollLock=0x%X, Level3=0x%X, Level5=0x%X, "
+           "Shift=0x%X, Ctrl=0x%X, Alt=0x%X, Meta=0x%X, Super=0x%X, Hyper=0x%X",
+           keymapWrapper, keymapWrapper->GetModifierMask(CAPS_LOCK),
+           keymapWrapper->GetModifierMask(NUM_LOCK),
+           keymapWrapper->GetModifierMask(SCROLL_LOCK),
+           keymapWrapper->GetModifierMask(LEVEL3),
+           keymapWrapper->GetModifierMask(LEVEL5),
+           keymapWrapper->GetModifierMask(SHIFT),
+           keymapWrapper->GetModifierMask(CTRL),
+           keymapWrapper->GetModifierMask(ALT),
+           keymapWrapper->GetModifierMask(META),
+           keymapWrapper->GetModifierMask(SUPER),
+           keymapWrapper->GetModifierMask(HYPER)));
+}
+
+/* This keymap routine is derived from weston-2.0.0/clients/simple-im.c
+ */
+static void keyboard_handle_keymap(void* data, struct wl_keyboard* wl_keyboard,
+                                   uint32_t format, int fd, uint32_t size) {
+  KeymapWrapper::ResetKeyboard();
+
+  if (format != WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1) {
+    close(fd);
+    return;
+  }
+
+  char* mapString = (char*)mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
+  if (mapString == MAP_FAILED) {
+    close(fd);
+    return;
+  }
+
+  static auto sXkbContextNew =
+      (struct xkb_context * (*)(enum xkb_context_flags))
+          dlsym(RTLD_DEFAULT, "xkb_context_new");
+  static auto sXkbKeymapNewFromString =
+      (struct xkb_keymap * (*)(struct xkb_context*, const char*,
+                               enum xkb_keymap_format,
+                               enum xkb_keymap_compile_flags))
+          dlsym(RTLD_DEFAULT, "xkb_keymap_new_from_string");
+
+  struct xkb_context* xkb_context = sXkbContextNew(XKB_CONTEXT_NO_FLAGS);
+  struct xkb_keymap* keymap =
+      sXkbKeymapNewFromString(xkb_context, mapString, XKB_KEYMAP_FORMAT_TEXT_V1,
+                              XKB_KEYMAP_COMPILE_NO_FLAGS);
+
+  munmap(mapString, size);
+  close(fd);
+
+  if (!keymap) {
+    NS_WARNING("keyboard_handle_keymap(): Failed to compile keymap!\n");
+    return;
+  }
+
+  KeymapWrapper::SetModifierMasks(keymap);
+
+  static auto sXkbKeymapUnRef =
+      (void (*)(struct xkb_keymap*))dlsym(RTLD_DEFAULT, "xkb_keymap_unref");
+  sXkbKeymapUnRef(keymap);
+
+  static auto sXkbContextUnref =
+      (void (*)(struct xkb_context*))dlsym(RTLD_DEFAULT, "xkb_context_unref");
+  sXkbContextUnref(xkb_context);
+}
+
+static void keyboard_handle_enter(void* data, struct wl_keyboard* keyboard,
+                                  uint32_t serial, struct wl_surface* surface,
+                                  struct wl_array* keys) {
+  KeymapWrapper::SetFocusIn(surface, serial);
+}
+
+static void keyboard_handle_leave(void* data, struct wl_keyboard* keyboard,
+                                  uint32_t serial, struct wl_surface* surface) {
+  KeymapWrapper::SetFocusOut(surface);
+}
+
+static void keyboard_handle_key(void* data, struct wl_keyboard* keyboard,
+                                uint32_t serial, uint32_t time, uint32_t key,
+                                uint32_t state) {}
+static void keyboard_handle_modifiers(void* data, struct wl_keyboard* keyboard,
+                                      uint32_t serial, uint32_t mods_depressed,
+                                      uint32_t mods_latched,
+                                      uint32_t mods_locked, uint32_t group) {}
+
+static const struct wl_keyboard_listener keyboard_listener = {
+    keyboard_handle_keymap, keyboard_handle_enter,     keyboard_handle_leave,
+    keyboard_handle_key,    keyboard_handle_modifiers,
+};
+
+static void seat_handle_capabilities(void* data, struct wl_seat* seat,
+                                     unsigned int caps) {
+  wl_keyboard* keyboard = KeymapWrapper::GetKeyboard();
+  if ((caps & WL_SEAT_CAPABILITY_KEYBOARD) && !keyboard) {
+    keyboard = wl_seat_get_keyboard(seat);
+    wl_keyboard_add_listener(keyboard, &keyboard_listener, nullptr);
+    KeymapWrapper::SetKeyboard(keyboard);
+  } else if (!(caps & WL_SEAT_CAPABILITY_KEYBOARD) && keyboard) {
+    KeymapWrapper::ClearKeyboard();
+  }
+}
+
+static const struct wl_seat_listener seat_listener = {
+    seat_handle_capabilities,
+};
+
+#endif
+
+KeymapWrapper::~KeymapWrapper() {
+#ifdef MOZ_X11
+  gdk_window_remove_filter(nullptr, FilterEvents, this);
+#endif
+  if (mOnKeysChangedSignalHandle) {
+    g_signal_handler_disconnect(mGdkKeymap, mOnKeysChangedSignalHandle);
+  }
+  if (mOnDirectionChangedSignalHandle) {
+    g_signal_handler_disconnect(mGdkKeymap, mOnDirectionChangedSignalHandle);
+  }
+  g_object_unref(mGdkKeymap);
+  MOZ_LOG(gKeyLog, LogLevel::Info, ("%p Destructor", this));
+}
+
+#ifdef MOZ_X11
+/* static */
+GdkFilterReturn KeymapWrapper::FilterEvents(GdkXEvent* aXEvent,
+                                            GdkEvent* aGdkEvent,
+                                            gpointer aData) {
+  XEvent* xEvent = static_cast<XEvent*>(aXEvent);
+  switch (xEvent->type) {
+    case KeyPress: {
+      // If the key doesn't support auto repeat, ignore the event because
+      // even if such key (e.g., Shift) is pressed during auto repeat of
+      // anoter key, it doesn't stop the auto repeat.
+      KeymapWrapper* self = static_cast<KeymapWrapper*>(aData);
+      if (!self->IsAutoRepeatableKey(xEvent->xkey.keycode)) {
+        break;
+      }
+      if (sRepeatState == NOT_PRESSED) {
+        sRepeatState = FIRST_PRESS;
+        MOZ_LOG(gKeyLog, LogLevel::Info,
+                ("FilterEvents(aXEvent={ type=KeyPress, "
+                 "xkey={ keycode=0x%08X, state=0x%08X, time=%lu } }, "
+                 "aGdkEvent={ state=0x%08X }), "
+                 "detected first keypress",
+                 xEvent->xkey.keycode, xEvent->xkey.state, xEvent->xkey.time,
+                 reinterpret_cast<GdkEventKey*>(aGdkEvent)->state));
+      } else if (sLastRepeatableHardwareKeyCode == xEvent->xkey.keycode) {
+        if (sLastRepeatableKeyTime == xEvent->xkey.time &&
+            sLastRepeatableHardwareKeyCode ==
+                IMContextWrapper::
+                    GetWaitingSynthesizedKeyPressHardwareKeyCode()) {
+          // On some environment, IM may generate duplicated KeyPress event
+          // without any special state flags.  In such case, we shouldn't
+          // treat the event as "repeated".
+          MOZ_LOG(gKeyLog, LogLevel::Info,
+                  ("FilterEvents(aXEvent={ type=KeyPress, "
+                   "xkey={ keycode=0x%08X, state=0x%08X, time=%lu } }, "
+                   "aGdkEvent={ state=0x%08X }), "
+                   "igored keypress since it must be synthesized by IME",
+                   xEvent->xkey.keycode, xEvent->xkey.state, xEvent->xkey.time,
+                   reinterpret_cast<GdkEventKey*>(aGdkEvent)->state));
+          break;
+        }
+        sRepeatState = REPEATING;
+        MOZ_LOG(gKeyLog, LogLevel::Info,
+                ("FilterEvents(aXEvent={ type=KeyPress, "
+                 "xkey={ keycode=0x%08X, state=0x%08X, time=%lu } }, "
+                 "aGdkEvent={ state=0x%08X }), "
+                 "detected repeating keypress",
+                 xEvent->xkey.keycode, xEvent->xkey.state, xEvent->xkey.time,
+                 reinterpret_cast<GdkEventKey*>(aGdkEvent)->state));
+      } else {
+        // If a different key is pressed while another key is pressed,
+        // auto repeat system repeats only the last pressed key.
+        // So, setting new keycode and setting repeat state as first key
+        // press should work fine.
+        sRepeatState = FIRST_PRESS;
+        MOZ_LOG(gKeyLog, LogLevel::Info,
+                ("FilterEvents(aXEvent={ type=KeyPress, "
+                 "xkey={ keycode=0x%08X, state=0x%08X, time=%lu } }, "
+                 "aGdkEvent={ state=0x%08X }), "
+                 "detected different keypress",
+                 xEvent->xkey.keycode, xEvent->xkey.state, xEvent->xkey.time,
+                 reinterpret_cast<GdkEventKey*>(aGdkEvent)->state));
+      }
+      sLastRepeatableHardwareKeyCode = xEvent->xkey.keycode;
+      sLastRepeatableKeyTime = xEvent->xkey.time;
+      break;
+    }
+    case KeyRelease: {
+      if (sLastRepeatableHardwareKeyCode != xEvent->xkey.keycode) {
+        // This case means the key release event is caused by
+        // a non-repeatable key such as Shift or a repeatable key that
+        // was pressed before sLastRepeatableHardwareKeyCode was
+        // pressed.
+        break;
+      }
+      sRepeatState = NOT_PRESSED;
+      MOZ_LOG(gKeyLog, LogLevel::Info,
+              ("FilterEvents(aXEvent={ type=KeyRelease, "
+               "xkey={ keycode=0x%08X, state=0x%08X, time=%lu } }, "
+               "aGdkEvent={ state=0x%08X }), "
+               "detected key release",
+               xEvent->xkey.keycode, xEvent->xkey.state, xEvent->xkey.time,
+               reinterpret_cast<GdkEventKey*>(aGdkEvent)->state));
+      break;
+    }
+    case FocusOut: {
+      // At moving focus, we should reset keyboard repeat state.
+      // Strictly, this causes incorrect behavior.  However, this
+      // correctness must be enough for web applications.
+      sRepeatState = NOT_PRESSED;
+      break;
+    }
+    default: {
+      KeymapWrapper* self = static_cast<KeymapWrapper*>(aData);
+      if (xEvent->type != self->mXKBBaseEventCode) {
+        break;
+      }
+      XkbEvent* xkbEvent = (XkbEvent*)xEvent;
+      if (xkbEvent->any.xkb_type != XkbControlsNotify ||
+          !(xkbEvent->ctrls.changed_ctrls & XkbPerKeyRepeatMask)) {
+        break;
+      }
+      if (!XGetKeyboardControl(xkbEvent->any.display, &self->mKeyboardState)) {
+        MOZ_LOG(gKeyLog, LogLevel::Info,
+                ("%p FilterEvents failed due to failure "
+                 "of XGetKeyboardControl(), display=0x%p",
+                 self, xkbEvent->any.display));
+      }
+      break;
+    }
+  }
+
+  return GDK_FILTER_CONTINUE;
+}
+#endif
+
+static void ResetBidiKeyboard() {
+  // Reset the bidi keyboard settings for the new GdkKeymap
+  nsCOMPtr<nsIBidiKeyboard> bidiKeyboard = nsContentUtils::GetBidiKeyboard();
+  if (bidiKeyboard) {
+    bidiKeyboard->Reset();
+  }
+  WidgetUtils::SendBidiKeyboardInfoToContent();
+}
+
+/* static */
+void KeymapWrapper::ResetKeyboard() {
+  if (sInstance) {
+    sInstance->mInitialized = false;
+    ResetBidiKeyboard();
+  }
+}
+
+/* static */
+void KeymapWrapper::OnKeysChanged(GdkKeymap* aGdkKeymap,
+                                  KeymapWrapper* aKeymapWrapper) {
+  MOZ_LOG(gKeyLog, LogLevel::Info,
+          ("OnKeysChanged, aGdkKeymap=%p, aKeymapWrapper=%p", aGdkKeymap,
+           aKeymapWrapper));
+
+  MOZ_ASSERT(sInstance == aKeymapWrapper,
+             "This instance must be the singleton instance");
+
+  // We cannot reintialize here becasue we don't have GdkWindow which is using
+  // the GdkKeymap.  We'll reinitialize it when next GetInstance() is called.
+  ResetKeyboard();
+}
+
+// static
+void KeymapWrapper::OnDirectionChanged(GdkKeymap* aGdkKeymap,
+                                       KeymapWrapper* aKeymapWrapper) {
+  // XXX
+  // A lot of diretion-changed signal might be fired on switching bidi
+  // keyboard when using both ibus (with arabic layout) and fcitx (with IME).
+  // See https://github.com/fcitx/fcitx/issues/257
+  //
+  // Also, when using ibus, switching to IM might not cause this signal.
+  // See https://github.com/ibus/ibus/issues/1848
+
+  MOZ_LOG(gKeyLog, LogLevel::Info,
+          ("OnDirectionChanged, aGdkKeymap=%p, aKeymapWrapper=%p", aGdkKeymap,
+           aKeymapWrapper));
+
+  ResetBidiKeyboard();
+}
+
+/* static */
+guint KeymapWrapper::GetCurrentModifierState() {
+  GdkModifierType modifiers;
+  GdkDisplay* display = gdk_display_get_default();
+  GdkScreen* screen = gdk_display_get_default_screen(display);
+  GdkWindow* window = gdk_screen_get_root_window(screen);
+  gdk_window_get_device_position(window, GdkGetPointer(), nullptr, nullptr,
+                                 &modifiers);
+  return static_cast<guint>(modifiers);
+}
+
+/* static */
+bool KeymapWrapper::AreModifiersCurrentlyActive(Modifiers aModifiers) {
+  guint modifierState = GetCurrentModifierState();
+  return AreModifiersActive(aModifiers, modifierState);
+}
+
+/* static */
+bool KeymapWrapper::AreModifiersActive(Modifiers aModifiers,
+                                       guint aModifierState) {
+  NS_ENSURE_TRUE(aModifiers, false);
+
+  KeymapWrapper* keymapWrapper = GetInstance();
+  for (uint32_t i = 0; i < sizeof(Modifier) * 8 && aModifiers; i++) {
+    Modifier modifier = static_cast<Modifier>(1 << i);
+    if (!(aModifiers & modifier)) {
+      continue;
+    }
+    if (!(aModifierState & keymapWrapper->GetModifierMask(modifier))) {
+      return false;
+    }
+    aModifiers &= ~modifier;
+  }
+  return true;
+}
+
+/* static */
+uint32_t KeymapWrapper::ComputeCurrentKeyModifiers() {
+  return ComputeKeyModifiers(GetCurrentModifierState());
+}
+
+/* static */
+uint32_t KeymapWrapper::ComputeKeyModifiers(guint aModifierState) {
+  KeymapWrapper* keymapWrapper = GetInstance();
+
+  uint32_t keyModifiers = 0;
+  // DOM Meta key should be TRUE only on Mac.  We need to discuss this
+  // issue later.
+  if (keymapWrapper->AreModifiersActive(SHIFT, aModifierState)) {
+    keyModifiers |= MODIFIER_SHIFT;
+  }
+  if (keymapWrapper->AreModifiersActive(CTRL, aModifierState)) {
+    keyModifiers |= MODIFIER_CONTROL;
+  }
+  if (keymapWrapper->AreModifiersActive(ALT, aModifierState)) {
+    keyModifiers |= MODIFIER_ALT;
+  }
+  if (keymapWrapper->AreModifiersActive(META, aModifierState)) {
+    keyModifiers |= MODIFIER_META;
+  }
+  if (keymapWrapper->AreModifiersActive(SUPER, aModifierState) ||
+      keymapWrapper->AreModifiersActive(HYPER, aModifierState)) {
+    keyModifiers |= MODIFIER_OS;
+  }
+  if (keymapWrapper->AreModifiersActive(LEVEL3, aModifierState) ||
+      keymapWrapper->AreModifiersActive(LEVEL5, aModifierState)) {
+    keyModifiers |= MODIFIER_ALTGRAPH;
+  }
+  if (keymapWrapper->AreModifiersActive(CAPS_LOCK, aModifierState)) {
+    keyModifiers |= MODIFIER_CAPSLOCK;
+  }
+  if (keymapWrapper->AreModifiersActive(NUM_LOCK, aModifierState)) {
+    keyModifiers |= MODIFIER_NUMLOCK;
+  }
+  if (keymapWrapper->AreModifiersActive(SCROLL_LOCK, aModifierState)) {
+    keyModifiers |= MODIFIER_SCROLLLOCK;
+  }
+  return keyModifiers;
+}
+
+/* static */
+guint KeymapWrapper::ConvertWidgetModifierToGdkState(
+    nsIWidget::Modifiers aNativeModifiers) {
+  if (!aNativeModifiers) {
+    return 0;
+  }
+  struct ModifierMapEntry {
+    nsIWidget::Modifiers mWidgetModifier;
+    Modifier mModifier;
+  };
+  // TODO: Currently, we don't treat L/R of each modifier on Linux.
+  // TODO: No proper native modifier for Level5.
+  static constexpr ModifierMapEntry sModifierMap[] = {
+      {nsIWidget::CAPS_LOCK, Modifier::CAPS_LOCK},
+      {nsIWidget::NUM_LOCK, Modifier::NUM_LOCK},
+      {nsIWidget::SHIFT_L, Modifier::SHIFT},
+      {nsIWidget::SHIFT_R, Modifier::SHIFT},
+      {nsIWidget::CTRL_L, Modifier::CTRL},
+      {nsIWidget::CTRL_R, Modifier::CTRL},
+      {nsIWidget::ALT_L, Modifier::ALT},
+      {nsIWidget::ALT_R, Modifier::ALT},
+      {nsIWidget::ALTGRAPH, Modifier::LEVEL3},
+      {nsIWidget::COMMAND_L, Modifier::SUPER},
+      {nsIWidget::COMMAND_R, Modifier::SUPER}};
+
+  guint state = 0;
+  KeymapWrapper* instance = GetInstance();
+  for (const ModifierMapEntry& entry : sModifierMap) {
+    if (aNativeModifiers & entry.mWidgetModifier) {
+      state |= instance->GetModifierMask(entry.mModifier);
+    }
+  }
+  return state;
+}
+
+/* static */
+void KeymapWrapper::InitInputEvent(WidgetInputEvent& aInputEvent,
+                                   guint aModifierState) {
+  KeymapWrapper* keymapWrapper = GetInstance();
+
+  aInputEvent.mModifiers = ComputeKeyModifiers(aModifierState);
+
+  // Don't log this method for non-important events because e.g., eMouseMove is
+  // just noisy and there is no reason to log it.
+  bool doLog = aInputEvent.mMessage != eMouseMove;
+  if (doLog) {
+    MOZ_LOG(gKeyLog, LogLevel::Debug,
+            ("%p InitInputEvent, aModifierState=0x%08X, "
+             "aInputEvent={ mMessage=%s, mModifiers=0x%04X (Shift: %s, "
+             "Control: %s, Alt: %s, "
+             "Meta: %s, OS: %s, AltGr: %s, "
+             "CapsLock: %s, NumLock: %s, ScrollLock: %s })",
+             keymapWrapper, aModifierState, ToChar(aInputEvent.mMessage),
+             aInputEvent.mModifiers,
+             GetBoolName(aInputEvent.mModifiers & MODIFIER_SHIFT),
+             GetBoolName(aInputEvent.mModifiers & MODIFIER_CONTROL),
+             GetBoolName(aInputEvent.mModifiers & MODIFIER_ALT),
+             GetBoolName(aInputEvent.mModifiers & MODIFIER_META),
+             GetBoolName(aInputEvent.mModifiers & MODIFIER_OS),
+             GetBoolName(aInputEvent.mModifiers & MODIFIER_ALTGRAPH),
+             GetBoolName(aInputEvent.mModifiers & MODIFIER_CAPSLOCK),
+             GetBoolName(aInputEvent.mModifiers & MODIFIER_NUMLOCK),
+             GetBoolName(aInputEvent.mModifiers & MODIFIER_SCROLLLOCK)));
+  }
+
+  switch (aInputEvent.mClass) {
+    case eMouseEventClass:
+    case eMouseScrollEventClass:
+    case eWheelEventClass:
+    case eDragEventClass:
+    case eSimpleGestureEventClass:
+      break;
+    default:
+      return;
+  }
+
+  WidgetMouseEventBase& mouseEvent = *aInputEvent.AsMouseEventBase();
+  mouseEvent.mButtons = 0;
+  if (aModifierState & GDK_BUTTON1_MASK) {
+    mouseEvent.mButtons |= MouseButtonsFlag::ePrimaryFlag;
+  }
+  if (aModifierState & GDK_BUTTON3_MASK) {
+    mouseEvent.mButtons |= MouseButtonsFlag::eSecondaryFlag;
+  }
+  if (aModifierState & GDK_BUTTON2_MASK) {
+    mouseEvent.mButtons |= MouseButtonsFlag::eMiddleFlag;
+  }
+
+  if (doLog) {
+    MOZ_LOG(
+        gKeyLog, LogLevel::Debug,
+        ("%p   InitInputEvent, aInputEvent has mButtons, "
+         "aInputEvent.mButtons=0x%04X (Left: %s, Right: %s, Middle: %s, "
+         "4th (BACK): %s, 5th (FORWARD): %s)",
+         keymapWrapper, mouseEvent.mButtons,
+         GetBoolName(mouseEvent.mButtons & MouseButtonsFlag::ePrimaryFlag),
+         GetBoolName(mouseEvent.mButtons & MouseButtonsFlag::eSecondaryFlag),
+         GetBoolName(mouseEvent.mButtons & MouseButtonsFlag::eMiddleFlag),
+         GetBoolName(mouseEvent.mButtons & MouseButtonsFlag::e4thFlag),
+         GetBoolName(mouseEvent.mButtons & MouseButtonsFlag::e5thFlag)));
+  }
+}
+
+/* static */
+uint32_t KeymapWrapper::ComputeDOMKeyCode(const GdkEventKey* aGdkKeyEvent) {
+  // If the keyval indicates it's a modifier key, we should use unshifted
+  // key's modifier keyval.
+  guint keyval = aGdkKeyEvent->keyval;
+  if (GetModifierForGDKKeyval(keyval)) {
+    // But if the keyval without modifiers isn't a modifier key, we
+    // shouldn't use it.  E.g., Japanese keyboard layout's
+    // Shift + Eisu-Toggle key is CapsLock.  This is an actual rare case,
+    // Windows uses different keycode for a physical key for different
+    // shift key state.
+    guint keyvalWithoutModifier = GetGDKKeyvalWithoutModifier(aGdkKeyEvent);
+    if (GetModifierForGDKKeyval(keyvalWithoutModifier)) {
+      keyval = keyvalWithoutModifier;
+    }
+    // Note that the modifier keycode and activating or deactivating
+    // modifier flag may be mismatched, but it's okay.  If a DOM key
+    // event handler is testing a keydown event, it's more likely being
+    // used to test which key is being pressed than to test which
+    // modifier will become active.  So, if we computed DOM keycode
+    // from modifier flag which were changing by the physical key, then
+    // there would be no other way for the user to generate the original
+    // keycode.
+    uint32_t DOMKeyCode = GetDOMKeyCodeFromKeyPairs(keyval);
+    NS_ASSERTION(DOMKeyCode, "All modifier keys must have a DOM keycode");
+    return DOMKeyCode;
+  }
+
+  // If the key isn't printable, let's look at the key pairs.
+  uint32_t charCode = GetCharCodeFor(aGdkKeyEvent);
+  if (!charCode) {
+    // Note that any key may be a function key because of some unusual keyboard
+    // layouts.  I.e., even if the pressed key is a printable key of en-US
+    // keyboard layout, we should expose the function key's keyCode value to
+    // web apps because web apps should handle the keydown/keyup events as
+    // inputted by usual keyboard layout.  For example, Hatchak keyboard
+    // maps Tab key to "Digit3" key and Level3 Shift makes it "Backspace".
+    // In this case, we should expose DOM_VK_BACK_SPACE (8).
+    uint32_t DOMKeyCode = GetDOMKeyCodeFromKeyPairs(keyval);
+    if (DOMKeyCode) {
+      // XXX If DOMKeyCode is a function key's keyCode value, it might be
+      //     better to consume necessary modifiers.  For example, if there is
+      //     no Control Pad section on keyboard like notebook, Delete key is
+      //     available only with Level3 Shift+"Backspace" key if using Hatchak.
+      //     If web apps accept Delete key operation only when no modifiers are
+      //     active, such users cannot use Delete key to do it.  However,
+      //     Chromium doesn't consume such necessary modifiers.  So, our default
+      //     behavior should keep not touching modifiers for compatibility, but
+      //     it might be better to add a pref to consume necessary modifiers.
+      return DOMKeyCode;
+    }
+    // If aGdkKeyEvent cannot be mapped to a DOM keyCode value, we should
+    // refer keyCode value without modifiers because web apps should be
+    // able to identify the key as far as possible.
+    guint keyvalWithoutModifier = GetGDKKeyvalWithoutModifier(aGdkKeyEvent);
+    return GetDOMKeyCodeFromKeyPairs(keyvalWithoutModifier);
+  }
+
+  // printable numpad keys should be resolved here.
+  switch (keyval) {
+    case GDK_KP_Multiply:
+      return NS_VK_MULTIPLY;
+    case GDK_KP_Add:
+      return NS_VK_ADD;
+    case GDK_KP_Separator:
+      return NS_VK_SEPARATOR;
+    case GDK_KP_Subtract:
+      return NS_VK_SUBTRACT;
+    case GDK_KP_Decimal:
+      return NS_VK_DECIMAL;
+    case GDK_KP_Divide:
+      return NS_VK_DIVIDE;
+    case GDK_KP_0:
+      return NS_VK_NUMPAD0;
+    case GDK_KP_1:
+      return NS_VK_NUMPAD1;
+    case GDK_KP_2:
+      return NS_VK_NUMPAD2;
+    case GDK_KP_3:
+      return NS_VK_NUMPAD3;
+    case GDK_KP_4:
+      return NS_VK_NUMPAD4;
+    case GDK_KP_5:
+      return NS_VK_NUMPAD5;
+    case GDK_KP_6:
+      return NS_VK_NUMPAD6;
+    case GDK_KP_7:
+      return NS_VK_NUMPAD7;
+    case GDK_KP_8:
+      return NS_VK_NUMPAD8;
+    case GDK_KP_9:
+      return NS_VK_NUMPAD9;
+  }
+
+  KeymapWrapper* keymapWrapper = GetInstance();
+
+  // Ignore all modifier state except NumLock.
+  guint baseState =
+      (aGdkKeyEvent->state & keymapWrapper->GetModifierMask(NUM_LOCK));
+
+  // Basically, we should use unmodified character for deciding our keyCode.
+  uint32_t unmodifiedChar = keymapWrapper->GetCharCodeFor(
+      aGdkKeyEvent, baseState, aGdkKeyEvent->group);
+  if (IsBasicLatinLetterOrNumeral(unmodifiedChar)) {
+    // If the unmodified character is an ASCII alphabet or an ASCII
+    // numeric, it's the best hint for deciding our keyCode.
+    return WidgetUtils::ComputeKeyCodeFromChar(unmodifiedChar);
+  }
+
+  // If the unmodified character is not an ASCII character, that means we
+  // couldn't find the hint. We should reset it.
+  if (!IsPrintableASCIICharacter(unmodifiedChar)) {
+    unmodifiedChar = 0;
+  }
+
+  // Retry with shifted keycode.
+  guint shiftState = (baseState | keymapWrapper->GetModifierMask(SHIFT));
+  uint32_t shiftedChar = keymapWrapper->GetCharCodeFor(aGdkKeyEvent, shiftState,
+                                                       aGdkKeyEvent->group);
+  if (IsBasicLatinLetterOrNumeral(shiftedChar)) {
+    // A shifted character can be an ASCII alphabet on Hebrew keyboard
+    // layout. And also shifted character can be an ASCII numeric on
+    // AZERTY keyboad layout.  Then, it's a good hint for deciding our
+    // keyCode.
+    return WidgetUtils::ComputeKeyCodeFromChar(shiftedChar);
+  }
+
+  // If the shifted unmodified character isn't an ASCII character, we should
+  // discard it too.
+  if (!IsPrintableASCIICharacter(shiftedChar)) {
+    shiftedChar = 0;
+  }
+
+  // If current keyboard layout isn't ASCII alphabet inputtable layout,
+  // look for ASCII alphabet inputtable keyboard layout.  If the key
+  // inputs an ASCII alphabet or an ASCII numeric, we should use it
+  // for deciding our keyCode.
+  uint32_t unmodCharLatin = 0;
+  uint32_t shiftedCharLatin = 0;
+  if (!keymapWrapper->IsLatinGroup(aGdkKeyEvent->group)) {
+    gint minGroup = keymapWrapper->GetFirstLatinGroup();
+    if (minGroup >= 0) {
+      unmodCharLatin =
+          keymapWrapper->GetCharCodeFor(aGdkKeyEvent, baseState, minGroup);
+      if (IsBasicLatinLetterOrNumeral(unmodCharLatin)) {
+        // If the unmodified character is an ASCII alphabet or
+        // an ASCII numeric, we should use it for the keyCode.
+        return WidgetUtils::ComputeKeyCodeFromChar(unmodCharLatin);
+      }
+      // If the unmodified character in the alternative ASCII capable
+      // keyboard layout isn't an ASCII character, that means we couldn't
+      // find the hint. We should reset it.
+      if (!IsPrintableASCIICharacter(unmodCharLatin)) {
+        unmodCharLatin = 0;
+      }
+      shiftedCharLatin =
+          keymapWrapper->GetCharCodeFor(aGdkKeyEvent, shiftState, minGroup);
+      if (IsBasicLatinLetterOrNumeral(shiftedCharLatin)) {
+        // If the shifted character is an ASCII alphabet or an ASCII
+        // numeric, we should use it for the keyCode.
+        return WidgetUtils::ComputeKeyCodeFromChar(shiftedCharLatin);
+      }
+      // If the shifted unmodified character in the alternative ASCII
+      // capable keyboard layout isn't an ASCII character, we should
+      // discard it too.
+      if (!IsPrintableASCIICharacter(shiftedCharLatin)) {
+        shiftedCharLatin = 0;
+      }
+    }
+  }
+
+  // If the key itself or with Shift state on active keyboard layout produces
+  // an ASCII punctuation character, we should decide keyCode value with it.
+  if (unmodifiedChar || shiftedChar) {
+    return WidgetUtils::ComputeKeyCodeFromChar(unmodifiedChar ? unmodifiedChar
+                                                              : shiftedChar);
+  }
+
+  // If the key itself or with Shift state on alternative ASCII capable
+  // keyboard layout produces an ASCII punctuation character, we should
+  // decide keyCode value with it.  Note that We've returned 0 for long
+  // time if keyCode isn't for an alphabet keys or a numeric key even in
+  // alternative ASCII capable keyboard layout because we decided that we
+  // should avoid setting same keyCode value to 2 or more keys since active
+  // keyboard layout may have a key to input the punctuation with different
+  // key.  However, setting keyCode to 0 makes some web applications which
+  // are aware of neither KeyboardEvent.key nor KeyboardEvent.code not work
+  // with Firefox when user selects non-ASCII capable keyboard layout such
+  // as Russian and Thai.  So, if alternative ASCII capable keyboard layout
+  // has keyCode value for the key, we should use it.  In other words, this
+  // behavior means that non-ASCII capable keyboard layout overrides some
+  // keys' keyCode value only if the key produces ASCII character by itself
+  // or with Shift key.
+  if (unmodCharLatin || shiftedCharLatin) {
+    return WidgetUtils::ComputeKeyCodeFromChar(
+        unmodCharLatin ? unmodCharLatin : shiftedCharLatin);
+  }
+
+  // Otherwise, let's decide keyCode value from the hardware_keycode
+  // value on major keyboard layout.
+  CodeNameIndex code = ComputeDOMCodeNameIndex(aGdkKeyEvent);
+  return WidgetKeyboardEvent::GetFallbackKeyCodeOfPunctuationKey(code);
+}
+
+KeyNameIndex KeymapWrapper::ComputeDOMKeyNameIndex(
+    const GdkEventKey* aGdkKeyEvent) {
+  switch (aGdkKeyEvent->keyval) {
+#define NS_NATIVE_KEY_TO_DOM_KEY_NAME_INDEX(aNativeKey, aKeyNameIndex) \
+  case aNativeKey:                                                     \
+    return aKeyNameIndex;
+
+#include "NativeKeyToDOMKeyName.h"
+
+#undef NS_NATIVE_KEY_TO_DOM_KEY_NAME_INDEX
+
+    default:
+      break;
+  }
+
+  return KEY_NAME_INDEX_Unidentified;
+}
+
+/* static */
+CodeNameIndex KeymapWrapper::ComputeDOMCodeNameIndex(
+    const GdkEventKey* aGdkKeyEvent) {
+  switch (aGdkKeyEvent->hardware_keycode) {
+#define NS_NATIVE_KEY_TO_DOM_CODE_NAME_INDEX(aNativeKey, aCodeNameIndex) \
+  case aNativeKey:                                                       \
+    return aCodeNameIndex;
+
+#include "NativeKeyToDOMCodeName.h"
+
+#undef NS_NATIVE_KEY_TO_DOM_CODE_NAME_INDEX
+
+    default:
+      break;
+  }
+
+  return CODE_NAME_INDEX_UNKNOWN;
+}
+
+/* static */
+bool KeymapWrapper::DispatchKeyDownOrKeyUpEvent(nsWindow* aWindow,
+                                                GdkEventKey* aGdkKeyEvent,
+                                                bool aIsProcessedByIME,
+                                                bool* aIsCancelled) {
+  MOZ_ASSERT(aIsCancelled, "aIsCancelled must not be nullptr");
+
+  *aIsCancelled = false;
+
+  if (aGdkKeyEvent->type == GDK_KEY_PRESS && aGdkKeyEvent->keyval == GDK_Tab &&
+      AreModifiersActive(CTRL | ALT, aGdkKeyEvent->state)) {
+    MOZ_LOG(gKeyLog, LogLevel::Info,
+            ("  DispatchKeyDownOrKeyUpEvent(), didn't dispatch keyboard events "
+             "because it's Ctrl + Alt + Tab"));
+    return false;
+  }
+
+  EventMessage message =
+      aGdkKeyEvent->type == GDK_KEY_PRESS ? eKeyDown : eKeyUp;
+  WidgetKeyboardEvent keyEvent(true, message, aWindow);
+  KeymapWrapper::InitKeyEvent(keyEvent, aGdkKeyEvent, aIsProcessedByIME);
+  return DispatchKeyDownOrKeyUpEvent(aWindow, keyEvent, aIsCancelled);
+}
+
+/* static */
+bool KeymapWrapper::DispatchKeyDownOrKeyUpEvent(
+    nsWindow* aWindow, WidgetKeyboardEvent& aKeyboardEvent,
+    bool* aIsCancelled) {
+  MOZ_ASSERT(aIsCancelled, "aIsCancelled must not be nullptr");
+
+  *aIsCancelled = false;
+
+  RefPtr<TextEventDispatcher> dispatcher = aWindow->GetTextEventDispatcher();
+  nsresult rv = dispatcher->BeginNativeInputTransaction();
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    MOZ_LOG(gKeyLog, LogLevel::Error,
+            ("  DispatchKeyDownOrKeyUpEvent(), stopped dispatching %s event "
+             "because of failed to initialize TextEventDispatcher",
+             ToChar(aKeyboardEvent.mMessage)));
+    return FALSE;
+  }
+
+  nsEventStatus status = nsEventStatus_eIgnore;
+  bool dispatched = dispatcher->DispatchKeyboardEvent(
+      aKeyboardEvent.mMessage, aKeyboardEvent, status, nullptr);
+  *aIsCancelled = (status == nsEventStatus_eConsumeNoDefault);
+  return dispatched;
+}
+
+/* static */
+bool KeymapWrapper::MaybeDispatchContextMenuEvent(nsWindow* aWindow,
+                                                  const GdkEventKey* aEvent) {
+  KeyNameIndex keyNameIndex = ComputeDOMKeyNameIndex(aEvent);
+
+  // Shift+F10 and ContextMenu should cause eContextMenu event.
+  if (keyNameIndex != KEY_NAME_INDEX_F10 &&
+      keyNameIndex != KEY_NAME_INDEX_ContextMenu) {
+    return false;
+  }
+
+  WidgetMouseEvent contextMenuEvent(true, eContextMenu, aWindow,
+                                    WidgetMouseEvent::eReal,
+                                    WidgetMouseEvent::eContextMenuKey);
+
+  contextMenuEvent.mRefPoint = LayoutDeviceIntPoint(0, 0);
+  contextMenuEvent.AssignEventTime(aWindow->GetWidgetEventTime(aEvent->time));
+  contextMenuEvent.mClickCount = 1;
+  KeymapWrapper::InitInputEvent(contextMenuEvent, aEvent->state);
+
+  if (contextMenuEvent.IsControl() || contextMenuEvent.IsMeta() ||
+      contextMenuEvent.IsAlt()) {
+    return false;
+  }
+
+  // If the key is ContextMenu, then an eContextMenu mouse event is
+  // dispatched regardless of the state of the Shift modifier.  When it is
+  // pressed without the Shift modifier, a web page can prevent the default
+  // context menu action.  When pressed with the Shift modifier, the web page
+  // cannot prevent the default context menu action.
+  // (PresShell::HandleEventInternal() sets mOnlyChromeDispatch to true.)
+
+  // If the key is F10, it needs Shift state because Shift+F10 is well-known
+  // shortcut key on Linux.  However, eContextMenu with Shift state is
+  // special.  It won't fire "contextmenu" event in the web content for
+  // blocking web page to prevent its default.  Therefore, this combination
+  // should work same as ContextMenu key.
+  // XXX Should we allow to block web page to prevent its default with
+  //     Ctrl+Shift+F10 or Alt+Shift+F10 instead?
+  if (keyNameIndex == KEY_NAME_INDEX_F10) {
+    if (!contextMenuEvent.IsShift()) {
+      return false;
+    }
+    contextMenuEvent.mModifiers &= ~MODIFIER_SHIFT;
+  }
+
+  aWindow->DispatchInputEvent(&contextMenuEvent);
+  return true;
+}
+
+/* static*/
+void KeymapWrapper::HandleKeyPressEvent(nsWindow* aWindow,
+                                        GdkEventKey* aGdkKeyEvent) {
+  MOZ_LOG(gKeyLog, LogLevel::Info,
+          ("HandleKeyPressEvent(aWindow=%p, aGdkKeyEvent={ type=%s, "
+           "keyval=%s(0x%X), state=0x%08X, hardware_keycode=0x%08X, "
+           "time=%u, is_modifier=%s })",
+           aWindow,
+           ((aGdkKeyEvent->type == GDK_KEY_PRESS) ? "GDK_KEY_PRESS"
+                                                  : "GDK_KEY_RELEASE"),
+           gdk_keyval_name(aGdkKeyEvent->keyval), aGdkKeyEvent->keyval,
+           aGdkKeyEvent->state, aGdkKeyEvent->hardware_keycode,
+           aGdkKeyEvent->time, GetBoolName(aGdkKeyEvent->is_modifier)));
+
+  // if we are in the middle of composing text, XIM gets to see it
+  // before mozilla does.
+  // FYI: Don't dispatch keydown event before notifying IME of the event
+  //      because IME may send a key event synchronously and consume the
+  //      original event.
+  bool IMEWasEnabled = false;
+  KeyHandlingState handlingState = KeyHandlingState::eNotHandled;
+  RefPtr<IMContextWrapper> imContext = aWindow->GetIMContext();
+  if (imContext) {
+    IMEWasEnabled = imContext->IsEnabled();
+    handlingState = imContext->OnKeyEvent(aWindow, aGdkKeyEvent);
+    if (handlingState == KeyHandlingState::eHandled) {
+      MOZ_LOG(gKeyLog, LogLevel::Info,
+              ("  HandleKeyPressEvent(), the event was handled by "
+               "IMContextWrapper"));
+      return;
+    }
+  }
+
+  // work around for annoying things.
+  if (aGdkKeyEvent->keyval == GDK_Tab &&
+      AreModifiersActive(CTRL | ALT, aGdkKeyEvent->state)) {
+    MOZ_LOG(gKeyLog, LogLevel::Info,
+            ("  HandleKeyPressEvent(), didn't dispatch keyboard events "
+             "because it's Ctrl + Alt + Tab"));
+    return;
+  }
+
+  // Dispatch keydown event always.  At auto repeating, we should send
+  // KEYDOWN -> KEYPRESS -> KEYDOWN -> KEYPRESS ... -> KEYUP
+  // However, old distributions (e.g., Ubuntu 9.10) sent native key
+  // release event, so, on such platform, the DOM events will be:
+  // KEYDOWN -> KEYPRESS -> KEYUP -> KEYDOWN -> KEYPRESS -> KEYUP...
+
+  bool isKeyDownCancelled = false;
+  if (handlingState == KeyHandlingState::eNotHandled) {
+    if (DispatchKeyDownOrKeyUpEvent(aWindow, aGdkKeyEvent, false,
+                                    &isKeyDownCancelled) &&
+        (MOZ_UNLIKELY(aWindow->IsDestroyed()) || isKeyDownCancelled)) {
+      MOZ_LOG(gKeyLog, LogLevel::Info,
+              ("  HandleKeyPressEvent(), dispatched eKeyDown event and "
+               "stopped handling the event because %s",
+               aWindow->IsDestroyed() ? "the window has been destroyed"
+                                      : "the event was consumed"));
+      return;
+    }
+    MOZ_LOG(gKeyLog, LogLevel::Info,
+            ("  HandleKeyPressEvent(), dispatched eKeyDown event and "
+             "it wasn't consumed"));
+    handlingState = KeyHandlingState::eNotHandledButEventDispatched;
+  }
+
+  // If a keydown event handler causes to enable IME, i.e., it moves
+  // focus from IME unusable content to IME usable editor, we should
+  // send the native key event to IME for the first input on the editor.
+  imContext = aWindow->GetIMContext();
+  if (!IMEWasEnabled && imContext && imContext->IsEnabled()) {
+    // Notice our keydown event was already dispatched.  This prevents
+    // unnecessary DOM keydown event in the editor.
+    handlingState = imContext->OnKeyEvent(aWindow, aGdkKeyEvent, true);
+    if (handlingState == KeyHandlingState::eHandled) {
+      MOZ_LOG(gKeyLog, LogLevel::Info,
+              ("  HandleKeyPressEvent(), the event was handled by "
+               "IMContextWrapper which was enabled by the preceding eKeyDown "
+               "event"));
+      return;
+    }
+  }
+
+  // Look for specialized app-command keys
+  switch (aGdkKeyEvent->keyval) {
+    case GDK_Back:
+      aWindow->DispatchCommandEvent(nsGkAtoms::Back);
+      MOZ_LOG(gKeyLog, LogLevel::Info,
+              ("  HandleKeyPressEvent(), dispatched \"Back\" command event"));
+      return;
+    case GDK_Forward:
+      aWindow->DispatchCommandEvent(nsGkAtoms::Forward);
+      MOZ_LOG(gKeyLog, LogLevel::Info,
+              ("  HandleKeyPressEvent(), dispatched \"Forward\" command "
+               "event"));
+      return;
+    case GDK_Reload:
+    case GDK_Refresh:
+      aWindow->DispatchCommandEvent(nsGkAtoms::Reload);
+      return;
+    case GDK_Stop:
+      aWindow->DispatchCommandEvent(nsGkAtoms::Stop);
+      MOZ_LOG(gKeyLog, LogLevel::Info,
+              ("  HandleKeyPressEvent(), dispatched \"Stop\" command event"));
+      return;
+    case GDK_Search:
+      aWindow->DispatchCommandEvent(nsGkAtoms::Search);
+      MOZ_LOG(gKeyLog, LogLevel::Info,
+              ("  HandleKeyPressEvent(), dispatched \"Search\" command event"));
+      return;
+    case GDK_Favorites:
+      aWindow->DispatchCommandEvent(nsGkAtoms::Bookmarks);
+      MOZ_LOG(gKeyLog, LogLevel::Info,
+              ("  HandleKeyPressEvent(), dispatched \"Bookmarks\" command "
+               "event"));
+      return;
+    case GDK_HomePage:
+      aWindow->DispatchCommandEvent(nsGkAtoms::Home);
+      return;
+    case GDK_Copy:
+    case GDK_F16:  // F16, F20, F18, F14 are old keysyms for Copy Cut Paste Undo
+      aWindow->DispatchContentCommandEvent(eContentCommandCopy);
+      MOZ_LOG(gKeyLog, LogLevel::Info,
+              ("  HandleKeyPressEvent(), dispatched \"Copy\" content command "
+               "event"));
+      return;
+    case GDK_Cut:
+    case GDK_F20:
+      aWindow->DispatchContentCommandEvent(eContentCommandCut);
+      MOZ_LOG(gKeyLog, LogLevel::Info,
+              ("  HandleKeyPressEvent(), dispatched \"Cut\" content command "
+               "event"));
+      return;
+    case GDK_Paste:
+    case GDK_F18:
+      aWindow->DispatchContentCommandEvent(eContentCommandPaste);
+      MOZ_LOG(gKeyLog, LogLevel::Info,
+              ("  HandleKeyPressEvent(), dispatched \"Paste\" content command "
+               "event"));
+      return;
+    case GDK_Redo:
+      aWindow->DispatchContentCommandEvent(eContentCommandRedo);
+      return;
+    case GDK_Undo:
+    case GDK_F14:
+      aWindow->DispatchContentCommandEvent(eContentCommandUndo);
+      MOZ_LOG(gKeyLog, LogLevel::Info,
+              ("  HandleKeyPressEvent(), dispatched \"Undo\" content command "
+               "event"));
+      return;
+    default:
+      break;
+  }
+
+  // before we dispatch a key, check if it's the context menu key.
+  // If so, send a context menu key event instead.
+  if (MaybeDispatchContextMenuEvent(aWindow, aGdkKeyEvent)) {
+    MOZ_LOG(gKeyLog, LogLevel::Info,
+            ("  HandleKeyPressEvent(), stopped dispatching eKeyPress event "
+             "because eContextMenu event was dispatched"));
+    return;
+  }
+
+  RefPtr<TextEventDispatcher> textEventDispatcher =
+      aWindow->GetTextEventDispatcher();
+  nsresult rv = textEventDispatcher->BeginNativeInputTransaction();
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    MOZ_LOG(gKeyLog, LogLevel::Error,
+            ("  HandleKeyPressEvent(), stopped dispatching eKeyPress event "
+             "because of failed to initialize TextEventDispatcher"));
+    return;
+  }
+
+  // If the character code is in the BMP, send the key press event.
+  // Otherwise, send a compositionchange event with the equivalent UTF-16
+  // string.
+  // TODO: Investigate other browser's behavior in this case because
+  //       this hack is odd for UI Events.
+  WidgetKeyboardEvent keypressEvent(true, eKeyPress, aWindow);
+  KeymapWrapper::InitKeyEvent(keypressEvent, aGdkKeyEvent, false);
+  nsEventStatus status = nsEventStatus_eIgnore;
+  if (keypressEvent.mKeyNameIndex != KEY_NAME_INDEX_USE_STRING ||
+      keypressEvent.mKeyValue.Length() == 1) {
+    if (textEventDispatcher->MaybeDispatchKeypressEvents(keypressEvent, status,
+                                                         aGdkKeyEvent)) {
+      MOZ_LOG(gKeyLog, LogLevel::Info,
+              ("  HandleKeyPressEvent(), dispatched eKeyPress event "
+               "(status=%s)",
+               GetStatusName(status)));
+    } else {
+      MOZ_LOG(gKeyLog, LogLevel::Info,
+              ("  HandleKeyPressEvent(), didn't dispatch eKeyPress event "
+               "(status=%s)",
+               GetStatusName(status)));
+    }
+  } else {
+    WidgetEventTime eventTime = aWindow->GetWidgetEventTime(aGdkKeyEvent->time);
+    textEventDispatcher->CommitComposition(status, &keypressEvent.mKeyValue,
+                                           &eventTime);
+    MOZ_LOG(gKeyLog, LogLevel::Info,
+            ("  HandleKeyPressEvent(), dispatched a set of composition "
+             "events"));
+  }
+}
+
+/* static */
+bool KeymapWrapper::HandleKeyReleaseEvent(nsWindow* aWindow,
+                                          GdkEventKey* aGdkKeyEvent) {
+  MOZ_LOG(gKeyLog, LogLevel::Info,
+          ("HandleKeyReleaseEvent(aWindow=%p, aGdkKeyEvent={ type=%s, "
+           "keyval=%s(0x%X), state=0x%08X, hardware_keycode=0x%08X, "
+           "time=%u, is_modifier=%s })",
+           aWindow,
+           ((aGdkKeyEvent->type == GDK_KEY_PRESS) ? "GDK_KEY_PRESS"
+                                                  : "GDK_KEY_RELEASE"),
+           gdk_keyval_name(aGdkKeyEvent->keyval), aGdkKeyEvent->keyval,
+           aGdkKeyEvent->state, aGdkKeyEvent->hardware_keycode,
+           aGdkKeyEvent->time, GetBoolName(aGdkKeyEvent->is_modifier)));
+
+  RefPtr<IMContextWrapper> imContext = aWindow->GetIMContext();
+  if (imContext) {
+    KeyHandlingState handlingState =
+        imContext->OnKeyEvent(aWindow, aGdkKeyEvent);
+    if (handlingState != KeyHandlingState::eNotHandled) {
+      MOZ_LOG(gKeyLog, LogLevel::Info,
+              ("  HandleKeyReleaseEvent(), the event was handled by "
+               "IMContextWrapper"));
+      return true;
+    }
+  }
+
+  bool isCancelled = false;
+  if (NS_WARN_IF(!DispatchKeyDownOrKeyUpEvent(aWindow, aGdkKeyEvent, false,
+                                              &isCancelled))) {
+    MOZ_LOG(gKeyLog, LogLevel::Error,
+            ("  HandleKeyReleaseEvent(), didn't dispatch eKeyUp event"));
+    return false;
+  }
+
+  MOZ_LOG(gKeyLog, LogLevel::Info,
+          ("  HandleKeyReleaseEvent(), dispatched eKeyUp event "
+           "(isCancelled=%s)",
+           GetBoolName(isCancelled)));
+  return true;
+}
+
+/* static */
+void KeymapWrapper::InitKeyEvent(WidgetKeyboardEvent& aKeyEvent,
+                                 GdkEventKey* aGdkKeyEvent,
+                                 bool aIsProcessedByIME) {
+  MOZ_ASSERT(
+      !aIsProcessedByIME || aKeyEvent.mMessage != eKeyPress,
+      "If the key event is handled by IME, keypress event shouldn't be fired");
+
+  KeymapWrapper* keymapWrapper = GetInstance();
+
+  aKeyEvent.mCodeNameIndex = ComputeDOMCodeNameIndex(aGdkKeyEvent);
+  MOZ_ASSERT(aKeyEvent.mCodeNameIndex != CODE_NAME_INDEX_USE_STRING);
+  aKeyEvent.mKeyNameIndex =
+      aIsProcessedByIME ? KEY_NAME_INDEX_Process
+                        : keymapWrapper->ComputeDOMKeyNameIndex(aGdkKeyEvent);
+  if (aKeyEvent.mKeyNameIndex == KEY_NAME_INDEX_Unidentified) {
+    uint32_t charCode = GetCharCodeFor(aGdkKeyEvent);
+    if (!charCode) {
+      charCode = keymapWrapper->GetUnmodifiedCharCodeFor(aGdkKeyEvent);
+    }
+    if (charCode) {
+      aKeyEvent.mKeyNameIndex = KEY_NAME_INDEX_USE_STRING;
+      MOZ_ASSERT(aKeyEvent.mKeyValue.IsEmpty(),
+                 "Uninitialized mKeyValue must be empty");
+      AppendUCS4ToUTF16(charCode, aKeyEvent.mKeyValue);
+    }
+  }
+
+  if (aIsProcessedByIME) {
+    aKeyEvent.mKeyCode = NS_VK_PROCESSKEY;
+  } else if (aKeyEvent.mKeyNameIndex != KEY_NAME_INDEX_USE_STRING ||
+             aKeyEvent.mMessage != eKeyPress) {
+    aKeyEvent.mKeyCode = ComputeDOMKeyCode(aGdkKeyEvent);
+  } else {
+    aKeyEvent.mKeyCode = 0;
+  }
+
+  // NOTE: The state of given key event indicates adjacent state of
+  // modifier keys.  E.g., even if the event is Shift key press event,
+  // the bit for Shift is still false.  By the same token, even if the
+  // event is Shift key release event, the bit for Shift is still true.
+  // Unfortunately, gdk_keyboard_get_modifiers() returns current modifier
+  // state.  It means if there're some pending modifier key press or
+  // key release events, the result isn't what we want.
+  guint modifierState = aGdkKeyEvent->state;
+  GdkDisplay* gdkDisplay = gdk_display_get_default();
+#ifdef MOZ_X11
+  if (aGdkKeyEvent->is_modifier && GdkIsX11Display(gdkDisplay)) {
+    Display* display = gdk_x11_display_get_xdisplay(gdkDisplay);
+    if (XEventsQueued(display, QueuedAfterReading)) {
+      XEvent nextEvent;
+      XPeekEvent(display, &nextEvent);
+      if (nextEvent.type == keymapWrapper->mXKBBaseEventCode) {
+        XkbEvent* XKBEvent = (XkbEvent*)&nextEvent;
+        if (XKBEvent->any.xkb_type == XkbStateNotify) {
+          XkbStateNotifyEvent* stateNotifyEvent =
+              (XkbStateNotifyEvent*)XKBEvent;
+          modifierState &= ~0xFF;
+          modifierState |= stateNotifyEvent->lookup_mods;
+        }
+      }
+    }
+  }
+#endif
+  InitInputEvent(aKeyEvent, modifierState);
+
+  switch (aGdkKeyEvent->keyval) {
+    case GDK_Shift_L:
+    case GDK_Control_L:
+    case GDK_Alt_L:
+    case GDK_Super_L:
+    case GDK_Hyper_L:
+    case GDK_Meta_L:
+      aKeyEvent.mLocation = eKeyLocationLeft;
+      break;
+
+    case GDK_Shift_R:
+    case GDK_Control_R:
+    case GDK_Alt_R:
+    case GDK_Super_R:
+    case GDK_Hyper_R:
+    case GDK_Meta_R:
+      aKeyEvent.mLocation = eKeyLocationRight;
+      break;
+
+    case GDK_KP_0:
+    case GDK_KP_1:
+    case GDK_KP_2:
+    case GDK_KP_3:
+    case GDK_KP_4:
+    case GDK_KP_5:
+    case GDK_KP_6:
+    case GDK_KP_7:
+    case GDK_KP_8:
+    case GDK_KP_9:
+    case GDK_KP_Space:
+    case GDK_KP_Tab:
+    case GDK_KP_Enter:
+    case GDK_KP_F1:
+    case GDK_KP_F2:
+    case GDK_KP_F3:
+    case GDK_KP_F4:
+    case GDK_KP_Home:
+    case GDK_KP_Left:
+    case GDK_KP_Up:
+    case GDK_KP_Right:
+    case GDK_KP_Down:
+    case GDK_KP_Prior:  // same as GDK_KP_Page_Up
+    case GDK_KP_Next:   // same as GDK_KP_Page_Down
+    case GDK_KP_End:
+    case GDK_KP_Begin:
+    case GDK_KP_Insert:
+    case GDK_KP_Delete:
+    case GDK_KP_Equal:
+    case GDK_KP_Multiply:
+    case GDK_KP_Add:
+    case GDK_KP_Separator:
+    case GDK_KP_Subtract:
+    case GDK_KP_Decimal:
+    case GDK_KP_Divide:
+      aKeyEvent.mLocation = eKeyLocationNumpad;
+      break;
+
+    default:
+      aKeyEvent.mLocation = eKeyLocationStandard;
+      break;
+  }
+
+  // The transformations above and in gdk for the keyval are not invertible
+  // so link to the GdkEvent (which will vanish soon after return from the
+  // event callback) to give plugins access to hardware_keycode and state.
+  // (An XEvent would be nice but the GdkEvent is good enough.)
+  aKeyEvent.mNativeKeyEvent = static_cast<void*>(aGdkKeyEvent);
+  aKeyEvent.mIsRepeat =
+      sRepeatState == REPEATING &&
+      aGdkKeyEvent->hardware_keycode == sLastRepeatableHardwareKeyCode;
+
+  MOZ_LOG(
+      gKeyLog, LogLevel::Info,
+      ("%p InitKeyEvent, modifierState=0x%08X "
+       "aKeyEvent={ mMessage=%s, isShift=%s, isControl=%s, "
+       "isAlt=%s, isMeta=%s , mKeyCode=0x%02X, mCharCode=%s, "
+       "mKeyNameIndex=%s, mKeyValue=%s, mCodeNameIndex=%s, mCodeValue=%s, "
+       "mLocation=%s, mIsRepeat=%s }",
+       keymapWrapper, modifierState, ToChar(aKeyEvent.mMessage),
+       GetBoolName(aKeyEvent.IsShift()), GetBoolName(aKeyEvent.IsControl()),
+       GetBoolName(aKeyEvent.IsAlt()), GetBoolName(aKeyEvent.IsMeta()),
+       aKeyEvent.mKeyCode,
+       GetCharacterCodeName(static_cast<char16_t>(aKeyEvent.mCharCode)).get(),
+       ToString(aKeyEvent.mKeyNameIndex).get(),
+       GetCharacterCodeNames(aKeyEvent.mKeyValue).get(),
+       ToString(aKeyEvent.mCodeNameIndex).get(),
+       GetCharacterCodeNames(aKeyEvent.mCodeValue).get(),
+       GetKeyLocationName(aKeyEvent.mLocation).get(),
+       GetBoolName(aKeyEvent.mIsRepeat)));
+}
+
+/* static */
+uint32_t KeymapWrapper::GetCharCodeFor(const GdkEventKey* aGdkKeyEvent) {
+  // Anything above 0xf000 is considered a non-printable
+  // Exception: directly encoded UCS characters
+  if (aGdkKeyEvent->keyval > 0xf000 &&
+      (aGdkKeyEvent->keyval & 0xff000000) != 0x01000000) {
+    // Keypad keys are an exception: they return a value different
+    // from their non-keypad equivalents, but mozilla doesn't distinguish.
+    switch (aGdkKeyEvent->keyval) {
+      case GDK_KP_Space:
+        return ' ';
+      case GDK_KP_Equal:
+        return '=';
+      case GDK_KP_Multiply:
+        return '*';
+      case GDK_KP_Add:
+        return '+';
+      case GDK_KP_Separator:
+        return ',';
+      case GDK_KP_Subtract:
+        return '-';
+      case GDK_KP_Decimal:
+        return '.';
+      case GDK_KP_Divide:
+        return '/';
+      case GDK_KP_0:
+        return '0';
+      case GDK_KP_1:
+        return '1';
+      case GDK_KP_2:
+        return '2';
+      case GDK_KP_3:
+        return '3';
+      case GDK_KP_4:
+        return '4';
+      case GDK_KP_5:
+        return '5';
+      case GDK_KP_6:
+        return '6';
+      case GDK_KP_7:
+        return '7';
+      case GDK_KP_8:
+        return '8';
+      case GDK_KP_9:
+        return '9';
+      default:
+        return 0;  // non-printables
+    }
+  }
+
+  static const long MAX_UNICODE = 0x10FFFF;
+
+  // we're supposedly printable, let's try to convert
+  long ucs = keysym2ucs(aGdkKeyEvent->keyval);
+  if ((ucs != -1) && (ucs < MAX_UNICODE)) {
+    return ucs;
+  }
+
+  // I guess we couldn't convert
+  return 0;
+}
+
+uint32_t KeymapWrapper::GetCharCodeFor(const GdkEventKey* aGdkKeyEvent,
+                                       guint aModifierState, gint aGroup) {
+  guint keyval;
+  if (!gdk_keymap_translate_keyboard_state(
+          mGdkKeymap, aGdkKeyEvent->hardware_keycode,
+          GdkModifierType(aModifierState), aGroup, &keyval, nullptr, nullptr,
+          nullptr)) {
+    return 0;
+  }
+  GdkEventKey tmpEvent = *aGdkKeyEvent;
+  tmpEvent.state = aModifierState;
+  tmpEvent.keyval = keyval;
+  tmpEvent.group = aGroup;
+  return GetCharCodeFor(&tmpEvent);
+}
+
+uint32_t KeymapWrapper::GetUnmodifiedCharCodeFor(
+    const GdkEventKey* aGdkKeyEvent) {
+  guint state = aGdkKeyEvent->state &
+                (GetModifierMask(SHIFT) | GetModifierMask(CAPS_LOCK) |
+                 GetModifierMask(NUM_LOCK) | GetModifierMask(SCROLL_LOCK) |
+                 GetModifierMask(LEVEL3) | GetModifierMask(LEVEL5));
+  uint32_t charCode =
+      GetCharCodeFor(aGdkKeyEvent, GdkModifierType(state), aGdkKeyEvent->group);
+  if (charCode) {
+    return charCode;
+  }
+  // If no character is mapped to the key when Level3 Shift or Level5 Shift
+  // is active, let's return a character which is inputted by the key without
+  // Level3 nor Level5 Shift.
+  guint stateWithoutAltGraph =
+      state & ~(GetModifierMask(LEVEL3) | GetModifierMask(LEVEL5));
+  if (state == stateWithoutAltGraph) {
+    return 0;
+  }
+  return GetCharCodeFor(aGdkKeyEvent, GdkModifierType(stateWithoutAltGraph),
+                        aGdkKeyEvent->group);
+}
+
+gint KeymapWrapper::GetKeyLevel(GdkEventKey* aGdkKeyEvent) {
+  gint level;
+  if (!gdk_keymap_translate_keyboard_state(
+          mGdkKeymap, aGdkKeyEvent->hardware_keycode,
+          GdkModifierType(aGdkKeyEvent->state), aGdkKeyEvent->group, nullptr,
+          nullptr, &level, nullptr)) {
+    return -1;
+  }
+  return level;
+}
+
+gint KeymapWrapper::GetFirstLatinGroup() {
+  GdkKeymapKey* keys;
+  gint count;
+  gint minGroup = -1;
+  if (gdk_keymap_get_entries_for_keyval(mGdkKeymap, GDK_a, &keys, &count)) {
+    // find the minimum number group for latin inputtable layout
+    for (gint i = 0; i < count && minGroup != 0; ++i) {
+      if (keys[i].level != 0 && keys[i].level != 1) {
+        continue;
+      }
+      if (minGroup >= 0 && keys[i].group > minGroup) {
+        continue;
+      }
+      minGroup = keys[i].group;
+    }
+    g_free(keys);
+  }
+  return minGroup;
+}
+
+bool KeymapWrapper::IsLatinGroup(guint8 aGroup) {
+  GdkKeymapKey* keys;
+  gint count;
+  bool result = false;
+  if (gdk_keymap_get_entries_for_keyval(mGdkKeymap, GDK_a, &keys, &count)) {
+    for (gint i = 0; i < count; ++i) {
+      if (keys[i].level != 0 && keys[i].level != 1) {
+        continue;
+      }
+      if (keys[i].group == aGroup) {
+        result = true;
+        break;
+      }
+    }
+    g_free(keys);
+  }
+  return result;
+}
+
+bool KeymapWrapper::IsAutoRepeatableKey(guint aHardwareKeyCode) {
+#ifdef MOZ_X11
+  uint8_t indexOfArray = aHardwareKeyCode / 8;
+  MOZ_ASSERT(indexOfArray < ArrayLength(mKeyboardState.auto_repeats),
+             "invalid index");
+  char bitMask = 1 << (aHardwareKeyCode % 8);
+  return (mKeyboardState.auto_repeats[indexOfArray] & bitMask) != 0;
+#else
+  return false;
+#endif
+}
+
+/* static */
+bool KeymapWrapper::IsBasicLatinLetterOrNumeral(uint32_t aCharCode) {
+  return (aCharCode >= 'a' && aCharCode <= 'z') ||
+         (aCharCode >= 'A' && aCharCode <= 'Z') ||
+         (aCharCode >= '0' && aCharCode <= '9');
+}
+
+/* static */
+guint KeymapWrapper::GetGDKKeyvalWithoutModifier(
+    const GdkEventKey* aGdkKeyEvent) {
+  KeymapWrapper* keymapWrapper = GetInstance();
+  guint state =
+      (aGdkKeyEvent->state & keymapWrapper->GetModifierMask(NUM_LOCK));
+  guint keyval;
+  if (!gdk_keymap_translate_keyboard_state(
+          keymapWrapper->mGdkKeymap, aGdkKeyEvent->hardware_keycode,
+          GdkModifierType(state), aGdkKeyEvent->group, &keyval, nullptr,
+          nullptr, nullptr)) {
+    return 0;
+  }
+  return keyval;
+}
+
+/* static */
+uint32_t KeymapWrapper::GetDOMKeyCodeFromKeyPairs(guint aGdkKeyval) {
+  switch (aGdkKeyval) {
+    case GDK_Cancel:
+      return NS_VK_CANCEL;
+    case GDK_BackSpace:
+      return NS_VK_BACK;
+    case GDK_Tab:
+    case GDK_ISO_Left_Tab:
+      return NS_VK_TAB;
+    case GDK_Clear:
+      return NS_VK_CLEAR;
+    case GDK_Return:
+      return NS_VK_RETURN;
+    case GDK_Shift_L:
+    case GDK_Shift_R:
+    case GDK_Shift_Lock:
+      return NS_VK_SHIFT;
+    case GDK_Control_L:
+    case GDK_Control_R:
+      return NS_VK_CONTROL;
+    case GDK_Alt_L:
+    case GDK_Alt_R:
+      return NS_VK_ALT;
+    case GDK_Meta_L:
+    case GDK_Meta_R:
+      return NS_VK_META;
+
+    // Assume that Super or Hyper is always mapped to physical Win key.
+    case GDK_Super_L:
+    case GDK_Super_R:
+    case GDK_Hyper_L:
+    case GDK_Hyper_R:
+      return NS_VK_WIN;
+
+    // GTK's AltGraph key is similar to Mac's Option (Alt) key.  However,
+    // unfortunately, browsers on Mac are using NS_VK_ALT for it even though
+    // it's really different from Alt key on Windows.
+    // On the other hand, GTK's AltGrapsh keys are really different from
+    // Alt key.  However, there is no AltGrapsh key on Windows.  On Windows,
+    // both Ctrl and Alt keys are pressed internally when AltGr key is
+    // pressed.  For some languages' users, AltGraph key is important, so,
+    // web applications on such locale may want to know AltGraph key press.
+    // Therefore, we should map AltGr keycode for them only on GTK.
+    case GDK_ISO_Level3_Shift:
+    case GDK_ISO_Level5_Shift:
+    // We assume that Mode_switch is always used for level3 shift.
+    case GDK_Mode_switch:
+      return NS_VK_ALTGR;
+
+    case GDK_Pause:
+      return NS_VK_PAUSE;
+    case GDK_Caps_Lock:
+      return NS_VK_CAPS_LOCK;
+    case GDK_Kana_Lock:
+    case GDK_Kana_Shift:
+      return NS_VK_KANA;
+    case GDK_Hangul:
+      return NS_VK_HANGUL;
+    // case GDK_XXX:                   return NS_VK_JUNJA;
+    // case GDK_XXX:                   return NS_VK_FINAL;
+    case GDK_Hangul_Hanja:
+      return NS_VK_HANJA;
+    case GDK_Kanji:
+      return NS_VK_KANJI;
+    case GDK_Escape:
+      return NS_VK_ESCAPE;
+    case GDK_Henkan:
+      return NS_VK_CONVERT;
+    case GDK_Muhenkan:
+      return NS_VK_NONCONVERT;
+    // case GDK_XXX:                   return NS_VK_ACCEPT;
+    // case GDK_XXX:                   return NS_VK_MODECHANGE;
+    case GDK_Page_Up:
+      return NS_VK_PAGE_UP;
+    case GDK_Page_Down:
+      return NS_VK_PAGE_DOWN;
+    case GDK_End:
+      return NS_VK_END;
+    case GDK_Home:
+      return NS_VK_HOME;
+    case GDK_Left:
+      return NS_VK_LEFT;
+    case GDK_Up:
+      return NS_VK_UP;
+    case GDK_Right:
+      return NS_VK_RIGHT;
+    case GDK_Down:
+      return NS_VK_DOWN;
+    case GDK_Select:
+      return NS_VK_SELECT;
+    case GDK_Print:
+      return NS_VK_PRINT;
+    case GDK_Execute:
+      return NS_VK_EXECUTE;
+    case GDK_Insert:
+      return NS_VK_INSERT;
+    case GDK_Delete:
+      return NS_VK_DELETE;
+    case GDK_Help:
+      return NS_VK_HELP;
+
+    // keypad keys
+    case GDK_KP_Left:
+      return NS_VK_LEFT;
+    case GDK_KP_Right:
+      return NS_VK_RIGHT;
+    case GDK_KP_Up:
+      return NS_VK_UP;
+    case GDK_KP_Down:
+      return NS_VK_DOWN;
+    case GDK_KP_Page_Up:
+      return NS_VK_PAGE_UP;
+    // Not sure what these are
+    // case GDK_KP_Prior:              return NS_VK_;
+    // case GDK_KP_Next:               return NS_VK_;
+    case GDK_KP_Begin:
+      return NS_VK_CLEAR;  // Num-unlocked 5
+    case GDK_KP_Page_Down:
+      return NS_VK_PAGE_DOWN;
+    case GDK_KP_Home:
+      return NS_VK_HOME;
+    case GDK_KP_End:
+      return NS_VK_END;
+    case GDK_KP_Insert:
+      return NS_VK_INSERT;
+    case GDK_KP_Delete:
+      return NS_VK_DELETE;
+    case GDK_KP_Enter:
+      return NS_VK_RETURN;
+
+    case GDK_Num_Lock:
+      return NS_VK_NUM_LOCK;
+    case GDK_Scroll_Lock:
+      return NS_VK_SCROLL_LOCK;
+
+    // Function keys
+    case GDK_F1:
+      return NS_VK_F1;
+    case GDK_F2:
+      return NS_VK_F2;
+    case GDK_F3:
+      return NS_VK_F3;
+    case GDK_F4:
+      return NS_VK_F4;
+    case GDK_F5:
+      return NS_VK_F5;
+    case GDK_F6:
+      return NS_VK_F6;
+    case GDK_F7:
+      return NS_VK_F7;
+    case GDK_F8:
+      return NS_VK_F8;
+    case GDK_F9:
+      return NS_VK_F9;
+    case GDK_F10:
+      return NS_VK_F10;
+    case GDK_F11:
+      return NS_VK_F11;
+    case GDK_F12:
+      return NS_VK_F12;
+    case GDK_F13:
+      return NS_VK_F13;
+    case GDK_F14:
+      return NS_VK_F14;
+    case GDK_F15:
+      return NS_VK_F15;
+    case GDK_F16:
+      return NS_VK_F16;
+    case GDK_F17:
+      return NS_VK_F17;
+    case GDK_F18:
+      return NS_VK_F18;
+    case GDK_F19:
+      return NS_VK_F19;
+    case GDK_F20:
+      return NS_VK_F20;
+    case GDK_F21:
+      return NS_VK_F21;
+    case GDK_F22:
+      return NS_VK_F22;
+    case GDK_F23:
+      return NS_VK_F23;
+    case GDK_F24:
+      return NS_VK_F24;
+
+    // context menu key, keysym 0xff67, typically keycode 117 on 105-key
+    // (Microsoft) x86 keyboards, located between right 'Windows' key and
+    // right Ctrl key
+    case GDK_Menu:
+      return NS_VK_CONTEXT_MENU;
+    case GDK_Sleep:
+      return NS_VK_SLEEP;
+
+    case GDK_3270_Attn:
+      return NS_VK_ATTN;
+    case GDK_3270_CursorSelect:
+      return NS_VK_CRSEL;
+    case GDK_3270_ExSelect:
+      return NS_VK_EXSEL;
+    case GDK_3270_EraseEOF:
+      return NS_VK_EREOF;
+    case GDK_3270_Play:
+      return NS_VK_PLAY;
+    // case GDK_XXX:                   return NS_VK_ZOOM;
+    case GDK_3270_PA1:
+      return NS_VK_PA1;
+
+    // map Sun Keyboard special keysyms on to NS_VK keys
+
+    // Sun F11 key generates SunF36(0x1005ff10) keysym
+    case 0x1005ff10:
+      return NS_VK_F11;
+    // Sun F12 key generates SunF37(0x1005ff11) keysym
+    case 0x1005ff11:
+      return NS_VK_F12;
+    default:
+      return 0;
+  }
+}
+
+void KeymapWrapper::WillDispatchKeyboardEvent(WidgetKeyboardEvent& aKeyEvent,
+                                              GdkEventKey* aGdkKeyEvent) {
+  GetInstance()->WillDispatchKeyboardEventInternal(aKeyEvent, aGdkKeyEvent);
+}
+
+void KeymapWrapper::WillDispatchKeyboardEventInternal(
+    WidgetKeyboardEvent& aKeyEvent, GdkEventKey* aGdkKeyEvent) {
+  if (!aGdkKeyEvent) {
+    // If aGdkKeyEvent is nullptr, we're trying to dispatch a fake keyboard
+    // event in such case, we don't need to set alternative char codes.
+    // So, we don't need to do nothing here.  This case is typically we're
+    // dispatching eKeyDown or eKeyUp event during composition.
+    return;
+  }
+
+  uint32_t charCode = GetCharCodeFor(aGdkKeyEvent);
+  if (!charCode) {
+    MOZ_LOG(gKeyLog, LogLevel::Info,
+            ("%p WillDispatchKeyboardEventInternal, "
+             "mKeyCode=0x%02X, charCode=0x%08X",
+             this, aKeyEvent.mKeyCode, aKeyEvent.mCharCode));
+    return;
+  }
+
+  // The mCharCode was set from mKeyValue. However, for example, when Ctrl key
+  // is pressed, its value should indicate an ASCII character for backward
+  // compatibility rather than inputting character without the modifiers.
+  // Therefore, we need to modify mCharCode value here.
+  aKeyEvent.SetCharCode(charCode);
+
+  gint level = GetKeyLevel(aGdkKeyEvent);
+  if (level != 0 && level != 1) {
+    MOZ_LOG(gKeyLog, LogLevel::Info,
+            ("%p WillDispatchKeyboardEventInternal, "
+             "mKeyCode=0x%02X, mCharCode=0x%08X, level=%d",
+             this, aKeyEvent.mKeyCode, aKeyEvent.mCharCode, level));
+    return;
+  }
+
+  guint baseState =
+      aGdkKeyEvent->state & ~(GetModifierMask(SHIFT) | GetModifierMask(CTRL) |
+                              GetModifierMask(ALT) | GetModifierMask(META) |
+                              GetModifierMask(SUPER) | GetModifierMask(HYPER));
+
+  // We shold send both shifted char and unshifted char, all keyboard layout
+  // users can use all keys.  Don't change event.mCharCode. On some keyboard
+  // layouts, Ctrl/Alt/Meta keys are used for inputting some characters.
+  AlternativeCharCode altCharCodes(0, 0);
+  // unshifted charcode of current keyboard layout.
+  altCharCodes.mUnshiftedCharCode =
+      GetCharCodeFor(aGdkKeyEvent, baseState, aGdkKeyEvent->group);
+  bool isLatin = (altCharCodes.mUnshiftedCharCode <= 0xFF);
+  // shifted charcode of current keyboard layout.
+  altCharCodes.mShiftedCharCode = GetCharCodeFor(
+      aGdkKeyEvent, baseState | GetModifierMask(SHIFT), aGdkKeyEvent->group);
+  isLatin = isLatin && (altCharCodes.mShiftedCharCode <= 0xFF);
+  if (altCharCodes.mUnshiftedCharCode || altCharCodes.mShiftedCharCode) {
+    aKeyEvent.mAlternativeCharCodes.AppendElement(altCharCodes);
+  }
+
+  bool needLatinKeyCodes = !isLatin;
+  if (!needLatinKeyCodes) {
+    needLatinKeyCodes =
+        (IS_ASCII_ALPHABETICAL(altCharCodes.mUnshiftedCharCode) !=
+         IS_ASCII_ALPHABETICAL(altCharCodes.mShiftedCharCode));
+  }
+
+  // If current keyboard layout can input Latin characters, we don't need
+  // more information.
+  if (!needLatinKeyCodes) {
+    MOZ_LOG(gKeyLog, LogLevel::Info,
+            ("%p WillDispatchKeyboardEventInternal, "
+             "mKeyCode=0x%02X, mCharCode=0x%08X, level=%d, altCharCodes={ "
+             "mUnshiftedCharCode=0x%08X, mShiftedCharCode=0x%08X }",
+             this, aKeyEvent.mKeyCode, aKeyEvent.mCharCode, level,
+             altCharCodes.mUnshiftedCharCode, altCharCodes.mShiftedCharCode));
+    return;
+  }
+
+  // Next, find Latin inputtable keyboard layout.
+  gint minGroup = GetFirstLatinGroup();
+  if (minGroup < 0) {
+    MOZ_LOG(gKeyLog, LogLevel::Info,
+            ("%p WillDispatchKeyboardEventInternal, "
+             "Latin keyboard layout isn't found: "
+             "mKeyCode=0x%02X, mCharCode=0x%08X, level=%d, "
+             "altCharCodes={ mUnshiftedCharCode=0x%08X, "
+             "mShiftedCharCode=0x%08X }",
+             this, aKeyEvent.mKeyCode, aKeyEvent.mCharCode, level,
+             altCharCodes.mUnshiftedCharCode, altCharCodes.mShiftedCharCode));
+    return;
+  }
+
+  AlternativeCharCode altLatinCharCodes(0, 0);
+  uint32_t unmodifiedCh = aKeyEvent.IsShift() ? altCharCodes.mShiftedCharCode
+                                              : altCharCodes.mUnshiftedCharCode;
+
+  // unshifted charcode of found keyboard layout.
+  uint32_t ch = GetCharCodeFor(aGdkKeyEvent, baseState, minGroup);
+  altLatinCharCodes.mUnshiftedCharCode =
+      IsBasicLatinLetterOrNumeral(ch) ? ch : 0;
+  // shifted charcode of found keyboard layout.
+  ch = GetCharCodeFor(aGdkKeyEvent, baseState | GetModifierMask(SHIFT),
+                      minGroup);
+  altLatinCharCodes.mShiftedCharCode = IsBasicLatinLetterOrNumeral(ch) ? ch : 0;
+  if (altLatinCharCodes.mUnshiftedCharCode ||
+      altLatinCharCodes.mShiftedCharCode) {
+    aKeyEvent.mAlternativeCharCodes.AppendElement(altLatinCharCodes);
+  }
+  // If the mCharCode is not Latin, and the level is 0 or 1, we should
+  // replace the mCharCode to Latin char if Alt and Meta keys are not
+  // pressed. (Alt should be sent the localized char for accesskey
+  // like handling of Web Applications.)
+  ch = aKeyEvent.IsShift() ? altLatinCharCodes.mShiftedCharCode
+                           : altLatinCharCodes.mUnshiftedCharCode;
+  if (ch && !(aKeyEvent.IsAlt() || aKeyEvent.IsMeta()) &&
+      charCode == unmodifiedCh) {
+    aKeyEvent.SetCharCode(ch);
+  }
+
+  MOZ_LOG(gKeyLog, LogLevel::Info,
+          ("%p WillDispatchKeyboardEventInternal, "
+           "mKeyCode=0x%02X, mCharCode=0x%08X, level=%d, minGroup=%d, "
+           "altCharCodes={ mUnshiftedCharCode=0x%08X, "
+           "mShiftedCharCode=0x%08X } "
+           "altLatinCharCodes={ mUnshiftedCharCode=0x%08X, "
+           "mShiftedCharCode=0x%08X }",
+           this, aKeyEvent.mKeyCode, aKeyEvent.mCharCode, level, minGroup,
+           altCharCodes.mUnshiftedCharCode, altCharCodes.mShiftedCharCode,
+           altLatinCharCodes.mUnshiftedCharCode,
+           altLatinCharCodes.mShiftedCharCode));
+}
+
+#ifdef MOZ_WAYLAND
+void KeymapWrapper::SetFocusIn(wl_surface* aFocusSurface,
+                               uint32_t aFocusSerial) {
+  LOGW("KeymapWrapper::SetFocusIn() surface %p ID %d serial %d", aFocusSurface,
+       aFocusSurface ? wl_proxy_get_id((struct wl_proxy*)aFocusSurface) : 0,
+       aFocusSerial);
+
+  KeymapWrapper* keymapWrapper = KeymapWrapper::GetInstance();
+  keymapWrapper->mFocusSurface = aFocusSurface;
+  keymapWrapper->mFocusSerial = aFocusSerial;
+}
+
+// aFocusSurface can be null in case that focused surface is already destroyed.
+void KeymapWrapper::SetFocusOut(wl_surface* aFocusSurface) {
+  KeymapWrapper* keymapWrapper = KeymapWrapper::GetInstance();
+  LOGW("KeymapWrapper::SetFocusOut surface %p ID %d", aFocusSurface,
+       aFocusSurface ? wl_proxy_get_id((struct wl_proxy*)aFocusSurface) : 0);
+
+  keymapWrapper->mFocusSurface = nullptr;
+  keymapWrapper->mFocusSerial = 0;
+}
+
+void KeymapWrapper::GetFocusInfo(wl_surface** aFocusSurface,
+                                 uint32_t* aFocusSerial) {
+  KeymapWrapper* keymapWrapper = KeymapWrapper::GetInstance();
+  *aFocusSurface = keymapWrapper->mFocusSurface;
+  *aFocusSerial = keymapWrapper->mFocusSerial;
+}
+
+void KeymapWrapper::SetSeat(wl_seat* aSeat, int aId) {
+  sSeat = aSeat;
+  sSeatID = aId;
+  wl_seat_add_listener(aSeat, &seat_listener, nullptr);
+}
+
+void KeymapWrapper::ClearSeat(int aId) {
+  if (sSeatID == aId) {
+    ClearKeyboard();
+    sSeat = nullptr;
+    sSeatID = -1;
+  }
+}
+
+wl_seat* KeymapWrapper::GetSeat() { return sSeat; }
+
+void KeymapWrapper::SetKeyboard(wl_keyboard* aKeyboard) {
+  sKeyboard = aKeyboard;
+}
+
+wl_keyboard* KeymapWrapper::GetKeyboard() { return sKeyboard; }
+
+void KeymapWrapper::ClearKeyboard() {
+  if (sKeyboard) {
+    wl_keyboard_destroy(sKeyboard);
+    sKeyboard = nullptr;
+  }
+}
+#endif
+
+}  // namespace widget
+}  // namespace mozilla