The Tor Browser: widget/BasicEvents.h@b8a032363ba2 (annotated)

widget/BasicEvents.h@b8a032363ba2 (annotated)

widget/BasicEvents.h

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* -*- 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__

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widget/BasicEvents.h