diff -r 000000000000 -r 6474c204b198 widget/BasicEvents.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/BasicEvents.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,1115 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef mozilla_BasicEvents_h__
+#define mozilla_BasicEvents_h__
+
+#include <stdint.h>
+
+#include "mozilla/dom/EventTarget.h"
+#include "nsCOMPtr.h"
+#include "nsIAtom.h"
+#include "nsISupportsImpl.h"
+#include "nsIWidget.h"
+#include "nsString.h"
+#include "Units.h"
+
+/******************************************************************************
+ * Event Struct Types
+ *
+ * TODO: Move it into mozilla namespace.
+ ******************************************************************************/
+enum nsEventStructType
+{
+  // BasicEvents.h
+  NS_EVENT,                          // WidgetEvent
+  NS_GUI_EVENT,                      // WidgetGUIEvent
+  NS_INPUT_EVENT,                    // WidgetInputEvent
+  NS_UI_EVENT,                       // InternalUIEvent
+
+  // TextEvents.h
+  NS_KEY_EVENT,                      // WidgetKeyboardEvent
+  NS_COMPOSITION_EVENT,              // WidgetCompositionEvent
+  NS_TEXT_EVENT,                     // WidgetTextEvent
+  NS_QUERY_CONTENT_EVENT,            // WidgetQueryContentEvent
+  NS_SELECTION_EVENT,                // WidgetSelectionEvent
+  NS_EDITOR_INPUT_EVENT,             // InternalEditorInputEvent
+
+  // MouseEvents.h
+  NS_MOUSE_EVENT,                    // WidgetMouseEvent
+  NS_DRAG_EVENT,                     // WidgetDragEvent
+  NS_MOUSE_SCROLL_EVENT,             // WidgetMouseScrollEvent
+  NS_WHEEL_EVENT,                    // WidgetWheelEvent
+  NS_POINTER_EVENT,                  // PointerEvent
+
+  // TouchEvents.h
+  NS_GESTURENOTIFY_EVENT,            // WidgetGestureNotifyEvent
+  NS_SIMPLE_GESTURE_EVENT,           // WidgetSimpleGestureEvent
+  NS_TOUCH_EVENT,                    // WidgetTouchEvent
+
+  // ContentEvents.h
+  NS_SCROLLPORT_EVENT,               // InternalScrollPortEvent
+  NS_SCROLLAREA_EVENT,               // InternalScrollAreaEvent
+  NS_FORM_EVENT,                     // InternalFormEvent
+  NS_FOCUS_EVENT,                    // InternalFocusEvent
+  NS_CLIPBOARD_EVENT,                // InternalClipboardEvent
+  NS_TRANSITION_EVENT,               // InternalTransitionEvent
+  NS_ANIMATION_EVENT,                // InternalAnimationEvent
+
+  // MiscEvents.h
+  NS_COMMAND_EVENT,                  // WidgetCommandEvent
+  NS_CONTENT_COMMAND_EVENT,          // WidgetContentCommandEvent
+  NS_PLUGIN_EVENT,                   // WidgetPluginEvent
+
+  // InternalMutationEvent.h (dom/events)
+  NS_MUTATION_EVENT,                 // InternalMutationEvent
+
+  // Follwoing struct type values are ugly.  They indicate other struct type
+  // actually.  However, they are used for distinguishing which DOM event
+  // should be created for the event.
+  NS_SVGZOOM_EVENT,                  // WidgetGUIEvent
+  NS_SMIL_TIME_EVENT                 // InternalUIEvent
+};
+
+/******************************************************************************
+ * Messages
+ *
+ * TODO: Make them enum.
+ ******************************************************************************/
+
+#define NS_EVENT_NULL                   0
+
+// This is a dummy event message for all event listener implementation in
+// EventListenerManager.
+#define NS_EVENT_ALL                    1
+
+#define NS_WINDOW_START                 100
+
+// Widget may be destroyed
+#define NS_XUL_CLOSE                    (NS_WINDOW_START + 1)
+// Key is pressed within a window
+#define NS_KEY_PRESS                    (NS_WINDOW_START + 31)
+// Key is released within a window
+#define NS_KEY_UP                       (NS_WINDOW_START + 32)
+// Key is pressed within a window
+#define NS_KEY_DOWN                     (NS_WINDOW_START + 33)
+
+#define NS_RESIZE_EVENT                 (NS_WINDOW_START + 60)
+#define NS_SCROLL_EVENT                 (NS_WINDOW_START + 61)
+
+// A plugin was clicked or otherwise focused. NS_PLUGIN_ACTIVATE should be
+// used when the window is not active. NS_PLUGIN_FOCUS should be used when
+// the window is active. In the latter case, the dispatcher of the event
+// is expected to ensure that the plugin's widget is focused beforehand.
+#define NS_PLUGIN_ACTIVATE               (NS_WINDOW_START + 62)
+#define NS_PLUGIN_FOCUS                  (NS_WINDOW_START + 63)
+
+#define NS_OFFLINE                       (NS_WINDOW_START + 64)
+#define NS_ONLINE                        (NS_WINDOW_START + 65)
+
+// NS_BEFORERESIZE_EVENT used to be here (NS_WINDOW_START + 66)
+
+// Indicates that the user is either idle or active
+#define NS_MOZ_USER_IDLE                 (NS_WINDOW_START + 67)
+#define NS_MOZ_USER_ACTIVE               (NS_WINDOW_START + 68)
+
+// The resolution at which a plugin should draw has changed, for
+// example as the result of changing from a HiDPI mode to a non-
+// HiDPI mode.
+#define NS_PLUGIN_RESOLUTION_CHANGED     (NS_WINDOW_START + 69)
+
+#define NS_MOUSE_MESSAGE_START          300
+#define NS_MOUSE_MOVE                   (NS_MOUSE_MESSAGE_START)
+#define NS_MOUSE_BUTTON_UP              (NS_MOUSE_MESSAGE_START + 1)
+#define NS_MOUSE_BUTTON_DOWN            (NS_MOUSE_MESSAGE_START + 2)
+#define NS_MOUSE_ENTER                  (NS_MOUSE_MESSAGE_START + 22)
+#define NS_MOUSE_EXIT                   (NS_MOUSE_MESSAGE_START + 23)
+#define NS_MOUSE_DOUBLECLICK            (NS_MOUSE_MESSAGE_START + 24)
+#define NS_MOUSE_CLICK                  (NS_MOUSE_MESSAGE_START + 27)
+#define NS_MOUSE_ACTIVATE               (NS_MOUSE_MESSAGE_START + 30)
+#define NS_MOUSE_ENTER_SYNTH            (NS_MOUSE_MESSAGE_START + 31)
+#define NS_MOUSE_EXIT_SYNTH             (NS_MOUSE_MESSAGE_START + 32)
+#define NS_MOUSE_MOZHITTEST             (NS_MOUSE_MESSAGE_START + 33)
+#define NS_MOUSEENTER                   (NS_MOUSE_MESSAGE_START + 34)
+#define NS_MOUSELEAVE                   (NS_MOUSE_MESSAGE_START + 35)
+
+// Pointer spec events
+#define NS_POINTER_EVENT_START          4400
+#define NS_POINTER_MOVE                 (NS_POINTER_EVENT_START)
+#define NS_POINTER_UP                   (NS_POINTER_EVENT_START + 1)
+#define NS_POINTER_DOWN                 (NS_POINTER_EVENT_START + 2)
+#define NS_POINTER_OVER                 (NS_POINTER_EVENT_START + 22)
+#define NS_POINTER_OUT                  (NS_POINTER_EVENT_START + 23)
+#define NS_POINTER_ENTER                (NS_POINTER_EVENT_START + 24)
+#define NS_POINTER_LEAVE                (NS_POINTER_EVENT_START + 25)
+#define NS_POINTER_CANCEL               (NS_POINTER_EVENT_START + 26)
+#define NS_POINTER_GOT_CAPTURE          (NS_POINTER_EVENT_START + 27)
+#define NS_POINTER_LOST_CAPTURE         (NS_POINTER_EVENT_START + 28)
+
+#define NS_CONTEXTMENU_MESSAGE_START    500
+#define NS_CONTEXTMENU                  (NS_CONTEXTMENU_MESSAGE_START)
+
+#define NS_STREAM_EVENT_START           1100
+#define NS_LOAD                         (NS_STREAM_EVENT_START)
+#define NS_PAGE_UNLOAD                  (NS_STREAM_EVENT_START + 1)
+#define NS_HASHCHANGE                   (NS_STREAM_EVENT_START + 2)
+#define NS_IMAGE_ABORT                  (NS_STREAM_EVENT_START + 3)
+#define NS_LOAD_ERROR                   (NS_STREAM_EVENT_START + 4)
+#define NS_POPSTATE                     (NS_STREAM_EVENT_START + 5)
+#define NS_BEFORE_PAGE_UNLOAD           (NS_STREAM_EVENT_START + 6)
+#define NS_PAGE_RESTORE                 (NS_STREAM_EVENT_START + 7)
+#define NS_READYSTATECHANGE             (NS_STREAM_EVENT_START + 8)
+ 
+#define NS_FORM_EVENT_START             1200
+#define NS_FORM_SUBMIT                  (NS_FORM_EVENT_START)
+#define NS_FORM_RESET                   (NS_FORM_EVENT_START + 1)
+#define NS_FORM_CHANGE                  (NS_FORM_EVENT_START + 2)
+#define NS_FORM_SELECTED                (NS_FORM_EVENT_START + 3)
+#define NS_FORM_INVALID                 (NS_FORM_EVENT_START + 4)
+
+//Need separate focus/blur notifications for non-native widgets
+#define NS_FOCUS_EVENT_START            1300
+#define NS_FOCUS_CONTENT                (NS_FOCUS_EVENT_START)
+#define NS_BLUR_CONTENT                 (NS_FOCUS_EVENT_START + 1)
+
+#define NS_DRAGDROP_EVENT_START         1400
+#define NS_DRAGDROP_ENTER               (NS_DRAGDROP_EVENT_START)
+#define NS_DRAGDROP_OVER                (NS_DRAGDROP_EVENT_START + 1)
+#define NS_DRAGDROP_EXIT                (NS_DRAGDROP_EVENT_START + 2)
+#define NS_DRAGDROP_DRAGDROP            (NS_DRAGDROP_EVENT_START + 3)
+#define NS_DRAGDROP_GESTURE             (NS_DRAGDROP_EVENT_START + 4)
+#define NS_DRAGDROP_DRAG                (NS_DRAGDROP_EVENT_START + 5)
+#define NS_DRAGDROP_END                 (NS_DRAGDROP_EVENT_START + 6)
+#define NS_DRAGDROP_START               (NS_DRAGDROP_EVENT_START + 7)
+#define NS_DRAGDROP_DROP                (NS_DRAGDROP_EVENT_START + 8)
+#define NS_DRAGDROP_OVER_SYNTH          (NS_DRAGDROP_EVENT_START + 1)
+#define NS_DRAGDROP_EXIT_SYNTH          (NS_DRAGDROP_EVENT_START + 2)
+#define NS_DRAGDROP_LEAVE_SYNTH         (NS_DRAGDROP_EVENT_START + 9)
+
+// Events for popups
+#define NS_XUL_EVENT_START            1500
+#define NS_XUL_POPUP_SHOWING          (NS_XUL_EVENT_START)
+#define NS_XUL_POPUP_SHOWN            (NS_XUL_EVENT_START+1)
+#define NS_XUL_POPUP_HIDING           (NS_XUL_EVENT_START+2)
+#define NS_XUL_POPUP_HIDDEN           (NS_XUL_EVENT_START+3)
+// NS_XUL_COMMAND used to be here     (NS_XUL_EVENT_START+4)
+#define NS_XUL_BROADCAST              (NS_XUL_EVENT_START+5)
+#define NS_XUL_COMMAND_UPDATE         (NS_XUL_EVENT_START+6)
+//@}
+
+// Scroll events
+#define NS_MOUSE_SCROLL_START         1600
+#define NS_MOUSE_SCROLL               (NS_MOUSE_SCROLL_START)
+#define NS_MOUSE_PIXEL_SCROLL         (NS_MOUSE_SCROLL_START + 1)
+
+#define NS_SCROLLPORT_START           1700
+#define NS_SCROLLPORT_UNDERFLOW       (NS_SCROLLPORT_START)
+#define NS_SCROLLPORT_OVERFLOW        (NS_SCROLLPORT_START+1)
+
+#define NS_MUTATION_START                    1800
+#define NS_MUTATION_SUBTREEMODIFIED          (NS_MUTATION_START)
+#define NS_MUTATION_NODEINSERTED             (NS_MUTATION_START+1)
+#define NS_MUTATION_NODEREMOVED              (NS_MUTATION_START+2)
+#define NS_MUTATION_NODEREMOVEDFROMDOCUMENT  (NS_MUTATION_START+3)
+#define NS_MUTATION_NODEINSERTEDINTODOCUMENT (NS_MUTATION_START+4)
+#define NS_MUTATION_ATTRMODIFIED             (NS_MUTATION_START+5)
+#define NS_MUTATION_CHARACTERDATAMODIFIED    (NS_MUTATION_START+6)
+#define NS_MUTATION_END                      (NS_MUTATION_START+6)
+
+#define NS_USER_DEFINED_EVENT         2000
+ 
+// composition events
+#define NS_COMPOSITION_EVENT_START    2200
+#define NS_COMPOSITION_START          (NS_COMPOSITION_EVENT_START)
+#define NS_COMPOSITION_END            (NS_COMPOSITION_EVENT_START + 1)
+#define NS_COMPOSITION_UPDATE         (NS_COMPOSITION_EVENT_START + 2)
+
+// text events
+#define NS_TEXT_START                 2400
+#define NS_TEXT_TEXT                  (NS_TEXT_START)
+
+// UI events
+#define NS_UI_EVENT_START          2500
+// this is not to be confused with NS_ACTIVATE!
+#define NS_UI_ACTIVATE             (NS_UI_EVENT_START)
+#define NS_UI_FOCUSIN              (NS_UI_EVENT_START + 1)
+#define NS_UI_FOCUSOUT             (NS_UI_EVENT_START + 2)
+
+// pagetransition events
+#define NS_PAGETRANSITION_START    2700
+#define NS_PAGE_SHOW               (NS_PAGETRANSITION_START + 1)
+#define NS_PAGE_HIDE               (NS_PAGETRANSITION_START + 2)
+
+// SVG events
+#define NS_SVG_EVENT_START              2800
+#define NS_SVG_LOAD                     (NS_SVG_EVENT_START)
+#define NS_SVG_UNLOAD                   (NS_SVG_EVENT_START + 1)
+#define NS_SVG_ABORT                    (NS_SVG_EVENT_START + 2)
+#define NS_SVG_ERROR                    (NS_SVG_EVENT_START + 3)
+#define NS_SVG_RESIZE                   (NS_SVG_EVENT_START + 4)
+#define NS_SVG_SCROLL                   (NS_SVG_EVENT_START + 5)
+
+// SVG Zoom events
+#define NS_SVGZOOM_EVENT_START          2900
+#define NS_SVG_ZOOM                     (NS_SVGZOOM_EVENT_START)
+
+// XUL command events
+#define NS_XULCOMMAND_EVENT_START       3000
+#define NS_XUL_COMMAND                  (NS_XULCOMMAND_EVENT_START)
+
+// Cut, copy, paste events
+#define NS_CUTCOPYPASTE_EVENT_START     3100
+#define NS_COPY             (NS_CUTCOPYPASTE_EVENT_START)
+#define NS_CUT              (NS_CUTCOPYPASTE_EVENT_START + 1)
+#define NS_PASTE            (NS_CUTCOPYPASTE_EVENT_START + 2)
+
+// Query the content information
+#define NS_QUERY_CONTENT_EVENT_START    3200
+// Query for the selected text information, it return the selection offset,
+// selection length and selected text.
+#define NS_QUERY_SELECTED_TEXT          (NS_QUERY_CONTENT_EVENT_START)
+// Query for the text content of specified range, it returns actual lengh (if
+// the specified range is too long) and the text of the specified range.
+// Returns the entire text if requested length > actual length.
+#define NS_QUERY_TEXT_CONTENT           (NS_QUERY_CONTENT_EVENT_START + 1)
+// Query for the caret rect of nth insertion point. The offset of the result is
+// relative position from the top level widget.
+#define NS_QUERY_CARET_RECT             (NS_QUERY_CONTENT_EVENT_START + 3)
+// Query for the bounding rect of a range of characters. This works on any
+// valid character range given offset and length. Result is relative to top
+// level widget coordinates
+#define NS_QUERY_TEXT_RECT              (NS_QUERY_CONTENT_EVENT_START + 4)
+// Query for the bounding rect of the current focused frame. Result is relative
+// to top level widget coordinates
+#define NS_QUERY_EDITOR_RECT            (NS_QUERY_CONTENT_EVENT_START + 5)
+// Query for the current state of the content. The particular members of
+// mReply that are set for each query content event will be valid on success.
+#define NS_QUERY_CONTENT_STATE          (NS_QUERY_CONTENT_EVENT_START + 6)
+// Query for the selection in the form of a nsITransferable.
+#define NS_QUERY_SELECTION_AS_TRANSFERABLE (NS_QUERY_CONTENT_EVENT_START + 7)
+// Query for character at a point.  This returns the character offset and its
+// rect.  The point is specified by Event::refPoint.
+#define NS_QUERY_CHARACTER_AT_POINT     (NS_QUERY_CONTENT_EVENT_START + 8)
+// Query if the DOM element under Event::refPoint belongs to our widget
+// or not.
+#define NS_QUERY_DOM_WIDGET_HITTEST     (NS_QUERY_CONTENT_EVENT_START + 9)
+
+// Video events
+#define NS_MEDIA_EVENT_START            3300
+#define NS_LOADSTART           (NS_MEDIA_EVENT_START)
+#define NS_PROGRESS            (NS_MEDIA_EVENT_START+1)
+#define NS_SUSPEND             (NS_MEDIA_EVENT_START+2)
+#define NS_EMPTIED             (NS_MEDIA_EVENT_START+3)
+#define NS_STALLED             (NS_MEDIA_EVENT_START+4)
+#define NS_PLAY                (NS_MEDIA_EVENT_START+5)
+#define NS_PAUSE               (NS_MEDIA_EVENT_START+6)
+#define NS_LOADEDMETADATA      (NS_MEDIA_EVENT_START+7)
+#define NS_LOADEDDATA          (NS_MEDIA_EVENT_START+8)
+#define NS_WAITING             (NS_MEDIA_EVENT_START+9)
+#define NS_PLAYING             (NS_MEDIA_EVENT_START+10)
+#define NS_CANPLAY             (NS_MEDIA_EVENT_START+11)
+#define NS_CANPLAYTHROUGH      (NS_MEDIA_EVENT_START+12)
+#define NS_SEEKING             (NS_MEDIA_EVENT_START+13)
+#define NS_SEEKED              (NS_MEDIA_EVENT_START+14)
+#define NS_TIMEUPDATE          (NS_MEDIA_EVENT_START+15)
+#define NS_ENDED               (NS_MEDIA_EVENT_START+16)
+#define NS_RATECHANGE          (NS_MEDIA_EVENT_START+17)
+#define NS_DURATIONCHANGE      (NS_MEDIA_EVENT_START+18)
+#define NS_VOLUMECHANGE        (NS_MEDIA_EVENT_START+19)
+
+// paint notification events
+#define NS_NOTIFYPAINT_START    3400
+#define NS_AFTERPAINT           (NS_NOTIFYPAINT_START)
+
+// Simple gesture events
+#define NS_SIMPLE_GESTURE_EVENT_START    3500
+#define NS_SIMPLE_GESTURE_SWIPE_START    (NS_SIMPLE_GESTURE_EVENT_START)
+#define NS_SIMPLE_GESTURE_SWIPE_UPDATE   (NS_SIMPLE_GESTURE_EVENT_START+1)
+#define NS_SIMPLE_GESTURE_SWIPE_END      (NS_SIMPLE_GESTURE_EVENT_START+2)
+#define NS_SIMPLE_GESTURE_SWIPE          (NS_SIMPLE_GESTURE_EVENT_START+3)
+#define NS_SIMPLE_GESTURE_MAGNIFY_START  (NS_SIMPLE_GESTURE_EVENT_START+4)
+#define NS_SIMPLE_GESTURE_MAGNIFY_UPDATE (NS_SIMPLE_GESTURE_EVENT_START+5)
+#define NS_SIMPLE_GESTURE_MAGNIFY        (NS_SIMPLE_GESTURE_EVENT_START+6)
+#define NS_SIMPLE_GESTURE_ROTATE_START   (NS_SIMPLE_GESTURE_EVENT_START+7)
+#define NS_SIMPLE_GESTURE_ROTATE_UPDATE  (NS_SIMPLE_GESTURE_EVENT_START+8)
+#define NS_SIMPLE_GESTURE_ROTATE         (NS_SIMPLE_GESTURE_EVENT_START+9)
+#define NS_SIMPLE_GESTURE_TAP            (NS_SIMPLE_GESTURE_EVENT_START+10)
+#define NS_SIMPLE_GESTURE_PRESSTAP       (NS_SIMPLE_GESTURE_EVENT_START+11)
+#define NS_SIMPLE_GESTURE_EDGE_STARTED   (NS_SIMPLE_GESTURE_EVENT_START+12)
+#define NS_SIMPLE_GESTURE_EDGE_CANCELED  (NS_SIMPLE_GESTURE_EVENT_START+13)
+#define NS_SIMPLE_GESTURE_EDGE_COMPLETED (NS_SIMPLE_GESTURE_EVENT_START+14)
+
+// These are used to send native events to plugins.
+#define NS_PLUGIN_EVENT_START            3600
+#define NS_PLUGIN_INPUT_EVENT            (NS_PLUGIN_EVENT_START)
+#define NS_PLUGIN_FOCUS_EVENT            (NS_PLUGIN_EVENT_START+1)
+
+// Events to manipulate selection (WidgetSelectionEvent)
+#define NS_SELECTION_EVENT_START        3700
+// Clear any previous selection and set the given range as the selection
+#define NS_SELECTION_SET                (NS_SELECTION_EVENT_START)
+
+// Events of commands for the contents
+#define NS_CONTENT_COMMAND_EVENT_START  3800
+#define NS_CONTENT_COMMAND_CUT          (NS_CONTENT_COMMAND_EVENT_START)
+#define NS_CONTENT_COMMAND_COPY         (NS_CONTENT_COMMAND_EVENT_START+1)
+#define NS_CONTENT_COMMAND_PASTE        (NS_CONTENT_COMMAND_EVENT_START+2)
+#define NS_CONTENT_COMMAND_DELETE       (NS_CONTENT_COMMAND_EVENT_START+3)
+#define NS_CONTENT_COMMAND_UNDO         (NS_CONTENT_COMMAND_EVENT_START+4)
+#define NS_CONTENT_COMMAND_REDO         (NS_CONTENT_COMMAND_EVENT_START+5)
+#define NS_CONTENT_COMMAND_PASTE_TRANSFERABLE (NS_CONTENT_COMMAND_EVENT_START+6)
+// NS_CONTENT_COMMAND_SCROLL scrolls the nearest scrollable element to the
+// currently focused content or latest DOM selection. This would normally be
+// the same element scrolled by keyboard scroll commands, except that this event
+// will scroll an element scrollable in either direction.  I.e., if the nearest
+// scrollable ancestor element can only be scrolled vertically, and horizontal
+// scrolling is requested using this event, no scrolling will occur.
+#define NS_CONTENT_COMMAND_SCROLL       (NS_CONTENT_COMMAND_EVENT_START+7)
+
+// Event to gesture notification
+#define NS_GESTURENOTIFY_EVENT_START 3900
+
+#define NS_ORIENTATION_EVENT         4000
+
+#define NS_SCROLLAREA_EVENT_START    4100
+#define NS_SCROLLEDAREACHANGED       (NS_SCROLLAREA_EVENT_START)
+
+#define NS_TRANSITION_EVENT_START    4200
+#define NS_TRANSITION_END            (NS_TRANSITION_EVENT_START)
+
+#define NS_ANIMATION_EVENT_START     4250
+#define NS_ANIMATION_START           (NS_ANIMATION_EVENT_START)
+#define NS_ANIMATION_END             (NS_ANIMATION_EVENT_START + 1)
+#define NS_ANIMATION_ITERATION       (NS_ANIMATION_EVENT_START + 2)
+
+#define NS_SMIL_TIME_EVENT_START     4300
+#define NS_SMIL_BEGIN                (NS_SMIL_TIME_EVENT_START)
+#define NS_SMIL_END                  (NS_SMIL_TIME_EVENT_START + 1)
+#define NS_SMIL_REPEAT               (NS_SMIL_TIME_EVENT_START + 2)
+
+#define NS_WEBAUDIO_EVENT_START      4350
+#define NS_AUDIO_PROCESS             (NS_WEBAUDIO_EVENT_START)
+#define NS_AUDIO_COMPLETE            (NS_WEBAUDIO_EVENT_START + 1)
+
+// script notification events
+#define NS_NOTIFYSCRIPT_START        4500
+#define NS_BEFORE_SCRIPT_EXECUTE     (NS_NOTIFYSCRIPT_START)
+#define NS_AFTER_SCRIPT_EXECUTE      (NS_NOTIFYSCRIPT_START+1)
+
+#define NS_PRINT_EVENT_START         4600
+#define NS_BEFOREPRINT               (NS_PRINT_EVENT_START)
+#define NS_AFTERPRINT                (NS_PRINT_EVENT_START + 1)
+
+#define NS_MESSAGE_EVENT_START       4700
+#define NS_MESSAGE                   (NS_MESSAGE_EVENT_START)
+
+// Open and close events
+#define NS_OPENCLOSE_EVENT_START     4800
+#define NS_OPEN                      (NS_OPENCLOSE_EVENT_START)
+#define NS_CLOSE                     (NS_OPENCLOSE_EVENT_START+1)
+
+// Device motion and orientation
+#define NS_DEVICE_ORIENTATION_START  4900
+#define NS_DEVICE_ORIENTATION        (NS_DEVICE_ORIENTATION_START)
+#define NS_DEVICE_MOTION             (NS_DEVICE_ORIENTATION_START+1)
+#define NS_DEVICE_PROXIMITY          (NS_DEVICE_ORIENTATION_START+2)
+#define NS_USER_PROXIMITY            (NS_DEVICE_ORIENTATION_START+3)
+#define NS_DEVICE_LIGHT              (NS_DEVICE_ORIENTATION_START+4)
+
+#define NS_SHOW_EVENT                5000
+
+// Fullscreen DOM API
+#define NS_FULL_SCREEN_START         5100
+#define NS_FULLSCREENCHANGE          (NS_FULL_SCREEN_START)
+#define NS_FULLSCREENERROR           (NS_FULL_SCREEN_START + 1)
+
+#define NS_TOUCH_EVENT_START         5200
+#define NS_TOUCH_START               (NS_TOUCH_EVENT_START)
+#define NS_TOUCH_MOVE                (NS_TOUCH_EVENT_START+1)
+#define NS_TOUCH_END                 (NS_TOUCH_EVENT_START+2)
+#define NS_TOUCH_ENTER               (NS_TOUCH_EVENT_START+3)
+#define NS_TOUCH_LEAVE               (NS_TOUCH_EVENT_START+4)
+#define NS_TOUCH_CANCEL              (NS_TOUCH_EVENT_START+5)
+
+// Pointerlock DOM API
+#define NS_POINTERLOCK_START         5300
+#define NS_POINTERLOCKCHANGE         (NS_POINTERLOCK_START)
+#define NS_POINTERLOCKERROR          (NS_POINTERLOCK_START + 1)
+
+#define NS_WHEEL_EVENT_START         5400
+#define NS_WHEEL_WHEEL               (NS_WHEEL_EVENT_START)
+#define NS_WHEEL_START               (NS_WHEEL_EVENT_START + 1)
+#define NS_WHEEL_STOP                (NS_WHEEL_EVENT_START + 2)
+
+//System time is changed
+#define NS_MOZ_TIME_CHANGE_EVENT     5500
+
+// Network packet events.
+#define NS_NETWORK_EVENT_START       5600
+#define NS_NETWORK_UPLOAD_EVENT      (NS_NETWORK_EVENT_START + 1)
+#define NS_NETWORK_DOWNLOAD_EVENT    (NS_NETWORK_EVENT_START + 2)
+
+// MediaRecorder events.
+#define NS_MEDIARECORDER_EVENT_START 5700
+#define NS_MEDIARECORDER_DATAAVAILABLE  (NS_MEDIARECORDER_EVENT_START + 1)
+#define NS_MEDIARECORDER_WARNING        (NS_MEDIARECORDER_EVENT_START + 2)
+#define NS_MEDIARECORDER_STOP           (NS_MEDIARECORDER_EVENT_START + 3)
+
+// SpeakerManager events
+#define NS_SPEAKERMANAGER_EVENT_START 5800
+#define NS_SPEAKERMANAGER_SPEAKERFORCEDCHANGE (NS_SPEAKERMANAGER_EVENT_START + 1)
+
+#ifdef MOZ_GAMEPAD
+// Gamepad input events
+#define NS_GAMEPAD_START         6000
+#define NS_GAMEPAD_BUTTONDOWN    (NS_GAMEPAD_START)
+#define NS_GAMEPAD_BUTTONUP      (NS_GAMEPAD_START+1)
+#define NS_GAMEPAD_AXISMOVE      (NS_GAMEPAD_START+2)
+#define NS_GAMEPAD_CONNECTED     (NS_GAMEPAD_START+3)
+#define NS_GAMEPAD_DISCONNECTED  (NS_GAMEPAD_START+4)
+// Keep this defined to the same value as the event above
+#define NS_GAMEPAD_END           (NS_GAMEPAD_START+4)
+#endif
+
+// input and beforeinput events.
+#define NS_EDITOR_EVENT_START    6100
+#define NS_EDITOR_INPUT          (NS_EDITOR_EVENT_START)
+
+namespace mozilla {
+
+/******************************************************************************
+ * mozilla::BaseEventFlags
+ *
+ * BaseEventFlags must be a POD struct for safe to use memcpy (including
+ * in ParamTraits<BaseEventFlags>).  So don't make virtual methods, constructor,
+ * destructor and operators.
+ * This is necessary for VC which is NOT C++0x compiler.
+ ******************************************************************************/
+
+struct BaseEventFlags
+{
+public:
+  // If mIsTrusted is true, the event is a trusted event.  Otherwise, it's
+  // an untrusted event.
+  bool    mIsTrusted : 1;
+  // If mInBubblingPhase is true, the event is in bubbling phase or target
+  // phase.
+  bool    mInBubblingPhase : 1;
+  // If mInCapturePhase is true, the event is in capture phase or target phase.
+  bool    mInCapturePhase : 1;
+  // If mInSystemGroup is true, the event is being dispatched in system group.
+  bool    mInSystemGroup: 1;
+  // If mCancelable is true, the event can be consumed.  I.e., calling
+  // dom::Event::PreventDefault() can prevent the default action.
+  bool    mCancelable : 1;
+  // If mBubbles is true, the event can bubble.  Otherwise, cannot be handled
+  // in bubbling phase.
+  bool    mBubbles : 1;
+  // If mPropagationStopped is true, dom::Event::StopPropagation() or
+  // dom::Event::StopImmediatePropagation() has been called.
+  bool    mPropagationStopped : 1;
+  // If mImmediatePropagationStopped is true,
+  // dom::Event::StopImmediatePropagation() has been called.
+  // Note that mPropagationStopped must be true when this is true.
+  bool    mImmediatePropagationStopped : 1;
+  // If mDefaultPrevented is true, the event has been consumed.
+  // E.g., dom::Event::PreventDefault() has been called or
+  // the default action has been performed.
+  bool    mDefaultPrevented : 1;
+  // If mDefaultPreventedByContent is true, the event has been
+  // consumed by content.
+  // Note that mDefaultPrevented must be true when this is true.
+  bool    mDefaultPreventedByContent : 1;
+  // mMultipleActionsPrevented may be used when default handling don't want to
+  // be prevented, but only one of the event targets should handle the event.
+  // For example, when a <label> element is in another <label> element and
+  // the first <label> element is clicked, that one may set this true.
+  // Then, the second <label> element won't handle the event.
+  bool    mMultipleActionsPrevented : 1;
+  // If mIsBeingDispatched is true, the DOM event created from the event is
+  // dispatching into the DOM tree and not completed.
+  bool    mIsBeingDispatched : 1;
+  // If mDispatchedAtLeastOnce is true, the event has been dispatched
+  // as a DOM event and the dispatch has been completed.
+  bool    mDispatchedAtLeastOnce : 1;
+  // If mIsSynthesizedForTests is true, the event has been synthesized for
+  // automated tests or something hacky approach of an add-on.
+  bool    mIsSynthesizedForTests : 1;
+  // If mExceptionHasBeenRisen is true, one of the event handlers has risen an
+  // exception.
+  bool    mExceptionHasBeenRisen : 1;
+  // If mRetargetToNonNativeAnonymous is true and the target is in a non-native
+  // native anonymous subtree, the event target is set to originalTarget.
+  bool    mRetargetToNonNativeAnonymous : 1;
+  // If mNoCrossProcessBoundaryForwarding is true, the event is not allowed to
+  // cross process boundary.
+  bool    mNoCrossProcessBoundaryForwarding : 1;
+  // If mNoContentDispatch is true, the event is never dispatched to the
+  // event handlers which are added to the contents, onfoo attributes and
+  // properties.  Note that this flag is ignored when
+  // EventChainPreVisitor::mForceContentDispatch is set true.  For exapmle,
+  // window and document object sets it true.  Therefore, web applications
+  // can handle the event if they add event listeners to the window or the
+  // document.
+  bool    mNoContentDispatch : 1;
+  // If mOnlyChromeDispatch is true, the event is dispatched to only chrome.
+  bool    mOnlyChromeDispatch : 1;
+  // If mWantReplyFromContentProcess is true, the event will be redispatched
+  // in the parent process after the content process has handled it. Useful
+  // for when the parent process need the know first how the event was used
+  // by content before handling it itself.
+  bool mWantReplyFromContentProcess : 1;
+
+  // If the event is being handled in target phase, returns true.
+  inline bool InTargetPhase() const
+  {
+    return (mInBubblingPhase && mInCapturePhase);
+  }
+
+  inline void Clear()
+  {
+    SetRawFlags(0);
+  }
+  // Get if either the instance's bit or the aOther's bit is true, the
+  // instance's bit becomes true.  In other words, this works like:
+  // eventFlags |= aOther;
+  inline void Union(const BaseEventFlags& aOther)
+  {
+    RawFlags rawFlags = GetRawFlags() | aOther.GetRawFlags();
+    SetRawFlags(rawFlags);
+  }
+
+private:
+  typedef uint32_t RawFlags;
+
+  inline void SetRawFlags(RawFlags aRawFlags)
+  {
+    static_assert(sizeof(BaseEventFlags) <= sizeof(RawFlags),
+      "mozilla::EventFlags must not be bigger than the RawFlags");
+    memcpy(this, &aRawFlags, sizeof(BaseEventFlags));
+  }
+  inline RawFlags GetRawFlags() const
+  {
+    RawFlags result = 0;
+    memcpy(&result, this, sizeof(BaseEventFlags));
+    return result;
+  }
+};
+
+/******************************************************************************
+ * mozilla::EventFlags
+ ******************************************************************************/
+
+struct EventFlags : public BaseEventFlags
+{
+  EventFlags()
+  {
+    Clear();
+  }
+};
+
+/******************************************************************************
+ * mozilla::WidgetEvent
+ ******************************************************************************/
+
+class WidgetEvent
+{
+protected:
+  WidgetEvent(bool aIsTrusted, uint32_t aMessage,
+              nsEventStructType aStructType) :
+    eventStructType(aStructType), message(aMessage), refPoint(0, 0),
+    lastRefPoint(0, 0), time(0), userType(0)
+  {
+    MOZ_COUNT_CTOR(WidgetEvent);
+    mFlags.Clear();
+    mFlags.mIsTrusted = aIsTrusted;
+    mFlags.mCancelable = true;
+    mFlags.mBubbles = true;
+  }
+
+  WidgetEvent()
+  {
+    MOZ_COUNT_CTOR(WidgetEvent);
+  }
+
+public:
+  WidgetEvent(bool aIsTrusted, uint32_t aMessage) :
+    eventStructType(NS_EVENT), message(aMessage), refPoint(0, 0),
+    lastRefPoint(0, 0), time(0), userType(0)
+  {
+    MOZ_COUNT_CTOR(WidgetEvent);
+    mFlags.Clear();
+    mFlags.mIsTrusted = aIsTrusted;
+    mFlags.mCancelable = true;
+    mFlags.mBubbles = true;
+  }
+
+  virtual ~WidgetEvent()
+  {
+    MOZ_COUNT_DTOR(WidgetEvent);
+  }
+
+  WidgetEvent(const WidgetEvent& aOther)
+  {
+    MOZ_COUNT_CTOR(WidgetEvent);
+    *this = aOther;
+  }
+
+  virtual WidgetEvent* Duplicate() const
+  {
+    MOZ_ASSERT(eventStructType == NS_EVENT,
+               "Duplicate() must be overridden by sub class");
+    WidgetEvent* result = new WidgetEvent(false, message);
+    result->AssignEventData(*this, true);
+    result->mFlags = mFlags;
+    return result;
+  }
+
+  // See event struct types
+  nsEventStructType eventStructType;
+  // See GUI MESSAGES,
+  uint32_t message;
+  // Relative to the widget of the event, or if there is no widget then it is
+  // in screen coordinates. Not modified by layout code.
+  LayoutDeviceIntPoint refPoint;
+  // The previous refPoint, if known, used to calculate mouse movement deltas.
+  LayoutDeviceIntPoint lastRefPoint;
+  // Elapsed time, in milliseconds, from a platform-specific zero time
+  // to the time the message was created
+  uint64_t time;
+  // See BaseEventFlags definition for the detail.
+  BaseEventFlags mFlags;
+
+  // Additional type info for user defined events
+  nsCOMPtr<nsIAtom> userType;
+
+  nsString typeString; // always set on non-main-thread events
+
+  // Event targets, needed by DOM Events
+  nsCOMPtr<dom::EventTarget> target;
+  nsCOMPtr<dom::EventTarget> currentTarget;
+  nsCOMPtr<dom::EventTarget> originalTarget;
+
+  void AssignEventData(const WidgetEvent& aEvent, bool aCopyTargets)
+  {
+    // eventStructType should be initialized with the constructor.
+    // However, NS_SVGZOOM_EVENT and NS_SMIL_TIME_EVENT are set after that.
+    // Therefore, we need to copy eventStructType here.
+    eventStructType = aEvent.eventStructType;
+    // message should be initialized with the constructor.
+    refPoint = aEvent.refPoint;
+    // lastRefPoint doesn't need to be copied.
+    time = aEvent.time;
+    // mFlags should be copied manually if it's necessary.
+    userType = aEvent.userType;
+    // typeString should be copied manually if it's necessary.
+    target = aCopyTargets ? aEvent.target : nullptr;
+    currentTarget = aCopyTargets ? aEvent.currentTarget : nullptr;
+    originalTarget = aCopyTargets ? aEvent.originalTarget : nullptr;
+  }
+
+  /**
+   * Utils for checking event types
+   */
+
+  /**
+   * As*Event() returns the pointer of the instance only when the instance is
+   * the class or one of its derived class.
+   */
+#define NS_ROOT_EVENT_CLASS(aPrefix, aName)
+#define NS_EVENT_CLASS(aPrefix, aName) \
+  virtual aPrefix##aName* As##aName(); \
+  const aPrefix##aName* As##aName() const;
+
+#include "mozilla/EventClassList.h"
+
+#undef NS_EVENT_CLASS
+#undef NS_ROOT_EVENT_CLASS
+
+  /**
+   * Returns true if the event is a query content event.
+   */
+  bool IsQueryContentEvent() const;
+  /**
+   * Returns true if the event is a selection event.
+   */
+  bool IsSelectionEvent() const;
+  /**
+   * Returns true if the event is a content command event.
+   */
+  bool IsContentCommandEvent() const;
+  /**
+   * Returns true if the event is a native event deliverer event for plugin.
+   */
+  bool IsNativeEventDelivererForPlugin() const;
+
+  /**
+   * Returns true if the event message is one of mouse events.
+   */
+  bool HasMouseEventMessage() const;
+  /**
+   * Returns true if the event message is one of drag events.
+   */
+  bool HasDragEventMessage() const;
+  /**
+   * Returns true if the event message is one of key events.
+   */
+  bool HasKeyEventMessage() const;
+  /**
+   * Returns true if the event message is one of composition events or text
+   * event.
+   */
+  bool HasIMEEventMessage() const;
+  /**
+   * Returns true if the event message is one of plugin activation events.
+   */
+  bool HasPluginActivationEventMessage() const;
+
+  /**
+   * Returns true if the event is native event deliverer event for plugin and
+   * it should be retarted to focused document.
+   */
+  bool IsRetargetedNativeEventDelivererForPlugin() const;
+  /**
+   * Returns true if the event is native event deliverer event for plugin and
+   * it should NOT be retarted to focused document.
+   */
+  bool IsNonRetargetedNativeEventDelivererForPlugin() const;
+  /**
+   * Returns true if the event is related to IME handling.  It includes
+   * IME events, query content events and selection events.
+   * Be careful when you use this.
+   */
+  bool IsIMERelatedEvent() const;
+
+  /**
+   * Whether the event should be handled by the frame of the mouse cursor
+   * position or not.  When it should be handled there (e.g., the mouse events),
+   * this returns true.
+   */
+  bool IsUsingCoordinates() const;
+  /**
+   * Whether the event should be handled by the focused DOM window in the
+   * same top level window's or not.  E.g., key events, IME related events
+   * (including the query content events, they are used in IME transaction)
+   * should be handled by the (last) focused window rather than the dispatched
+   * window.
+   *
+   * NOTE: Even if this returns true, the event isn't going to be handled by the
+   * application level active DOM window which is on another top level window.
+   * So, when the event is fired on a deactive window, the event is going to be
+   * handled by the last focused DOM window in the last focused window.
+   */
+  bool IsTargetedAtFocusedWindow() const;
+  /**
+   * Whether the event should be handled by the focused content or not.  E.g.,
+   * key events, IME related events and other input events which are not handled
+   * by the frame of the mouse cursor position.
+   *
+   * NOTE: Even if this returns true, the event isn't going to be handled by the
+   * application level active DOM window which is on another top level window.
+   * So, when the event is fired on a deactive window, the event is going to be
+   * handled by the last focused DOM element of the last focused DOM window in
+   * the last focused window.
+   */
+  bool IsTargetedAtFocusedContent() const;
+  /**
+   * Whether the event should cause a DOM event.
+   */
+  bool IsAllowedToDispatchDOMEvent() const;
+};
+
+/******************************************************************************
+ * mozilla::WidgetGUIEvent
+ ******************************************************************************/
+
+class WidgetGUIEvent : public WidgetEvent
+{
+protected:
+  WidgetGUIEvent(bool aIsTrusted, uint32_t aMessage, nsIWidget* aWidget,
+                 nsEventStructType aStructType) :
+    WidgetEvent(aIsTrusted, aMessage, aStructType),
+    widget(aWidget), pluginEvent(nullptr)
+  {
+  }
+
+  WidgetGUIEvent() :
+    pluginEvent(nullptr)
+  {
+  }
+
+public:
+  virtual WidgetGUIEvent* AsGUIEvent() MOZ_OVERRIDE { return this; }
+
+  WidgetGUIEvent(bool aIsTrusted, uint32_t aMessage, nsIWidget* aWidget) :
+    WidgetEvent(aIsTrusted, aMessage, NS_GUI_EVENT),
+    widget(aWidget), pluginEvent(nullptr)
+  {
+  }
+
+  virtual WidgetEvent* Duplicate() const MOZ_OVERRIDE
+  {
+    MOZ_ASSERT(eventStructType == NS_GUI_EVENT ||
+                 eventStructType == NS_SVGZOOM_EVENT,
+               "Duplicate() must be overridden by sub class");
+    // Not copying widget, it is a weak reference.
+    WidgetGUIEvent* result = new WidgetGUIEvent(false, message, nullptr);
+    result->AssignGUIEventData(*this, true);
+    result->mFlags = mFlags;
+    return result;
+  }
+
+  /// Originator of the event
+  nsCOMPtr<nsIWidget> widget;
+
+  /// Event for NPAPI plugin
+  void* pluginEvent;
+
+  void AssignGUIEventData(const WidgetGUIEvent& aEvent, bool aCopyTargets)
+  {
+    AssignEventData(aEvent, aCopyTargets);
+
+    // widget should be initialized with the constructor.
+
+    // pluginEvent shouldn't be copied because it may be referred after its
+    // instance is destroyed.
+    pluginEvent = nullptr;
+  }
+};
+
+/******************************************************************************
+ * mozilla::Modifier
+ *
+ * All modifier keys should be defined here.  This is used for managing
+ * modifier states for DOM Level 3 or later.
+ ******************************************************************************/
+
+enum Modifier
+{
+  MODIFIER_ALT        = 0x0001,
+  MODIFIER_ALTGRAPH   = 0x0002,
+  MODIFIER_CAPSLOCK   = 0x0004,
+  MODIFIER_CONTROL    = 0x0008,
+  MODIFIER_FN         = 0x0010,
+  MODIFIER_META       = 0x0020,
+  MODIFIER_NUMLOCK    = 0x0040,
+  MODIFIER_SCROLLLOCK = 0x0080,
+  MODIFIER_SHIFT      = 0x0100,
+  MODIFIER_SYMBOLLOCK = 0x0200,
+  MODIFIER_OS         = 0x0400
+};
+
+/******************************************************************************
+ * Modifier key names.
+ ******************************************************************************/
+
+#define NS_DOM_KEYNAME_ALT        "Alt"
+#define NS_DOM_KEYNAME_ALTGRAPH   "AltGraph"
+#define NS_DOM_KEYNAME_CAPSLOCK   "CapsLock"
+#define NS_DOM_KEYNAME_CONTROL    "Control"
+#define NS_DOM_KEYNAME_FN         "Fn"
+#define NS_DOM_KEYNAME_META       "Meta"
+#define NS_DOM_KEYNAME_NUMLOCK    "NumLock"
+#define NS_DOM_KEYNAME_SCROLLLOCK "ScrollLock"
+#define NS_DOM_KEYNAME_SHIFT      "Shift"
+#define NS_DOM_KEYNAME_SYMBOLLOCK "SymbolLock"
+#define NS_DOM_KEYNAME_OS         "OS"
+
+/******************************************************************************
+ * mozilla::Modifiers
+ ******************************************************************************/
+
+typedef uint16_t Modifiers;
+
+/******************************************************************************
+ * mozilla::WidgetInputEvent
+ ******************************************************************************/
+
+class WidgetInputEvent : public WidgetGUIEvent
+{
+protected:
+  WidgetInputEvent(bool aIsTrusted, uint32_t aMessage, nsIWidget* aWidget,
+                   nsEventStructType aStructType) :
+    WidgetGUIEvent(aIsTrusted, aMessage, aWidget, aStructType),
+    modifiers(0)
+  {
+  }
+
+  WidgetInputEvent()
+  {
+  }
+
+public:
+  virtual WidgetInputEvent* AsInputEvent() MOZ_OVERRIDE { return this; }
+
+  WidgetInputEvent(bool aIsTrusted, uint32_t aMessage, nsIWidget* aWidget) :
+    WidgetGUIEvent(aIsTrusted, aMessage, aWidget, NS_INPUT_EVENT),
+    modifiers(0)
+  {
+  }
+
+  virtual WidgetEvent* Duplicate() const MOZ_OVERRIDE
+  {
+    MOZ_ASSERT(eventStructType == NS_INPUT_EVENT,
+               "Duplicate() must be overridden by sub class");
+    // Not copying widget, it is a weak reference.
+    WidgetInputEvent* result = new WidgetInputEvent(false, message, nullptr);
+    result->AssignInputEventData(*this, true);
+    result->mFlags = mFlags;
+    return result;
+  }
+
+  // true indicates the shift key is down
+  bool IsShift() const
+  {
+    return ((modifiers & MODIFIER_SHIFT) != 0);
+  }
+  // true indicates the control key is down
+  bool IsControl() const
+  {
+    return ((modifiers & MODIFIER_CONTROL) != 0);
+  }
+  // true indicates the alt key is down
+  bool IsAlt() const
+  {
+    return ((modifiers & MODIFIER_ALT) != 0);
+  }
+  // true indicates the meta key is down (or, on Mac, the Command key)
+  bool IsMeta() const
+  {
+    return ((modifiers & MODIFIER_META) != 0);
+  }
+  // true indicates the win key is down on Windows. Or the Super or Hyper key
+  // is down on Linux.
+  bool IsOS() const
+  {
+    return ((modifiers & MODIFIER_OS) != 0);
+  }
+  // true indicates the alt graph key is down
+  // NOTE: on Mac, the option key press causes both IsAlt() and IsAltGrpah()
+  //       return true.
+  bool IsAltGraph() const
+  {
+    return ((modifiers & MODIFIER_ALTGRAPH) != 0);
+  }
+  // true indeicates the CapLock LED is turn on.
+  bool IsCapsLocked() const
+  {
+    return ((modifiers & MODIFIER_CAPSLOCK) != 0);
+  }
+  // true indeicates the NumLock LED is turn on.
+  bool IsNumLocked() const
+  {
+    return ((modifiers & MODIFIER_NUMLOCK) != 0);
+  }
+  // true indeicates the ScrollLock LED is turn on.
+  bool IsScrollLocked() const
+  {
+    return ((modifiers & MODIFIER_SCROLLLOCK) != 0);
+  }
+
+  // true indeicates the Fn key is down, but this is not supported by native
+  // key event on any platform.
+  bool IsFn() const
+  {
+    return ((modifiers & MODIFIER_FN) != 0);
+  }
+  // true indeicates the ScrollLock LED is turn on.
+  bool IsSymbolLocked() const
+  {
+    return ((modifiers & MODIFIER_SYMBOLLOCK) != 0);
+  }
+
+  void InitBasicModifiers(bool aCtrlKey,
+                          bool aAltKey,
+                          bool aShiftKey,
+                          bool aMetaKey)
+  {
+    modifiers = 0;
+    if (aCtrlKey) {
+      modifiers |= MODIFIER_CONTROL;
+    }
+    if (aAltKey) {
+      modifiers |= MODIFIER_ALT;
+    }
+    if (aShiftKey) {
+      modifiers |= MODIFIER_SHIFT;
+    }
+    if (aMetaKey) {
+      modifiers |= MODIFIER_META;
+    }
+  }
+
+  Modifiers modifiers;
+
+  void AssignInputEventData(const WidgetInputEvent& aEvent, bool aCopyTargets)
+  {
+    AssignGUIEventData(aEvent, aCopyTargets);
+
+    modifiers = aEvent.modifiers;
+  }
+};
+
+/******************************************************************************
+ * mozilla::InternalUIEvent
+ *
+ * XXX Why this inherits WidgetGUIEvent rather than WidgetEvent?
+ ******************************************************************************/
+
+class InternalUIEvent : public WidgetGUIEvent
+{
+protected:
+  InternalUIEvent()
+    : detail(0)
+  {
+  }
+
+  InternalUIEvent(bool aIsTrusted, uint32_t aMessage, nsIWidget* aWidget,
+                  nsEventStructType aStructType)
+    : WidgetGUIEvent(aIsTrusted, aMessage, aWidget, aStructType)
+    , detail(0)
+  {
+  }
+
+  InternalUIEvent(bool aIsTrusted, uint32_t aMessage,
+                  nsEventStructType aStructType)
+    : WidgetGUIEvent(aIsTrusted, aMessage, nullptr, aStructType)
+    , detail(0)
+  {
+  }
+
+public:
+  virtual InternalUIEvent* AsUIEvent() MOZ_OVERRIDE { return this; }
+
+  InternalUIEvent(bool aIsTrusted, uint32_t aMessage)
+    : WidgetGUIEvent(aIsTrusted, aMessage, nullptr, NS_UI_EVENT)
+    , detail(0)
+  {
+  }
+
+  virtual WidgetEvent* Duplicate() const MOZ_OVERRIDE
+  {
+    MOZ_ASSERT(eventStructType == NS_UI_EVENT ||
+                 eventStructType == NS_SMIL_TIME_EVENT,
+               "Duplicate() must be overridden by sub class");
+    InternalUIEvent* result = new InternalUIEvent(false, message);
+    result->AssignUIEventData(*this, true);
+    result->mFlags = mFlags;
+    return result;
+  }
+
+  int32_t detail;
+
+  void AssignUIEventData(const InternalUIEvent& aEvent, bool aCopyTargets)
+  {
+    AssignGUIEventData(aEvent, aCopyTargets);
+
+    detail = aEvent.detail;
+  }
+};
+
+} // namespace mozilla
+
+#endif // mozilla_BasicEvents_h__