[InputEvent] Fire 'beforeinput' during typing, pressing hot keys and IME composition

third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Igalia S.L.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 30 matching lines @@
 #include "core/editing/commands/CreateLinkCommand.h"
 #include "core/editing/commands/FormatBlockCommand.h"
 #include "core/editing/commands/IndentOutdentCommand.h"
 #include "core/editing/commands/InsertListCommand.h"
 #include "core/editing/commands/ReplaceSelectionCommand.h"
 #include "core/editing/commands/TypingCommand.h"
 #include "core/editing/commands/UnlinkCommand.h"
 #include "core/editing/serializers/Serialization.h"
 #include "core/editing/spellcheck/SpellChecker.h"
 #include "core/events/Event.h"
+#include "core/events/InputEvent.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLFontElement.h"
 #include "core/html/HTMLHRElement.h"
 #include "core/html/HTMLImageElement.h"
 #include "core/input/EventHandler.h"
 #include "core/layout/LayoutBox.h"
 #include "core/page/ChromeClient.h"
@@ skipping 1711 matching lines @@
 {
     // TODO(yosin) We should move this logic into |canExecute()| member function
     // in |EditorInternalCommand| to replace |allowExecutionWhenDisabled|.
     // |allowExecutionWhenDisabled| is for "Copy", "Cut" and "Paste" commands
     // only.
     if (!isEnabled(triggeringEvent)) {
         // Let certain commands be executed when performed explicitly even if they are disabled.
         if (!isSupported() || !m_frame || !m_command->allowExecutionWhenDisabled)
             return false;
     }
+
+    if (RuntimeEnabledFeatures::inputEventEnabled()) {
+        if (EventTarget* target = eventTargetNodeForDocument(m_frame->document())) {
+            RefPtrWillBeRawPtr<InputEvent> beforeInputEvent = InputEvent::createBeforeInput("executeCommand", "");

[chongz, 2016/03/01 20:41:10]

Didn't find a way to get command name from Editor::Command, should I add a name
field to Editor::Command?

[dtapuska, 2016/03/01 21:49:51]

Ya I think you'd want to load it from the EditorInternalCommand class..

+            DispatchEventResult dispatchResult = target->dispatchEvent(beforeInputEvent);
+            if (dispatchResult != DispatchEventResult::NotCanceled)
+                return true;
+        }
+    }
+
     frame().document()->updateLayoutIgnorePendingStylesheets();
     DEFINE_STATIC_LOCAL(SparseHistogram, commandHistogram, ("WebCore.Editing.Commands"));
     commandHistogram.sample(m_command->idForUserMetrics);
     return m_command->execute(*m_frame, triggeringEvent, m_source, parameter);
 }
 
 bool Editor::Command::execute(Event* triggeringEvent) const
 {
     return execute(String(), triggeringEvent);
 }
@@ skipping 39 matching lines @@
 {
     return m_command && m_command->isTextInsertion;
 }
 
 int Editor::Command::idForHistogram() const
 {
     return isSupported() ? m_command->idForUserMetrics : 0;
 }
 
 } // namespace blink