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

third_party/WebKit/Source/core/editing/EditingUtilities.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 23 matching lines @@
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/editing/EditingStrategy.h"
 #include "core/editing/Editor.h"
 #include "core/editing/PlainTextRange.h"
 #include "core/editing/PositionIterator.h"
 #include "core/editing/VisiblePosition.h"
 #include "core/editing/VisibleSelection.h"
 #include "core/editing/VisibleUnits.h"
 #include "core/editing/iterators/TextIterator.h"
 #include "core/editing/serializers/HTMLInterchange.h"
+#include "core/events/InputEvent.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/UseCounter.h"
 #include "core/html/HTMLBRElement.h"
 #include "core/html/HTMLDivElement.h"
 #include "core/html/HTMLLIElement.h"
 #include "core/html/HTMLParagraphElement.h"
 #include "core/html/HTMLSpanElement.h"
 #include "core/html/HTMLTableCellElement.h"
 #include "core/html/HTMLUListElement.h"
 #include "core/layout/LayoutObject.h"
@@ skipping 1591 matching lines @@
     // otherwise, make sure to be at the start of the first selected node,
     // instead of possibly at the end of the last node before the selection
     return mostForwardCaretPosition(visiblePosition.deepEquivalent());
 }
 
 bool isTextSecurityNode(const Node* node)
 {
     return node && node->layoutObject() && node->layoutObject()->style()->textSecurity() != TSNONE;
 }
 
+DispatchEventResult dispatchBeforeInputInsertText(EventTarget* target, const String& data)
+{
+    static const char* kInputTypeInsertText = "insertText";

[yosin_UTC9, 2016/03/15 08:32:32]

Could you move |kInputTypeXXX| into "InputEvent.h"?

+    return dispatchBeforeInputEditorCommand(target, kInputTypeInsertText, data);
+}
+
+DispatchEventResult dispatchBeforeInputEditorCommand(EventTarget* target, const char* commandName, const String& data)
+{
+    if (RuntimeEnabledFeatures::inputEventEnabled()) {
+        if (target) {
+            RefPtrWillBeRawPtr<InputEvent> beforeInputEvent = InputEvent::createCancelableBeforeInput(commandName, data);
+            return target->dispatchEvent(beforeInputEvent);
+        }
+    }
+    return DispatchEventResult::NotCanceled;
+}
+
+DispatchEventResult dispatchBeforeInputCompositionUpdate(EventTarget* target, const String& data)
+{
+    if (RuntimeEnabledFeatures::inputEventEnabled()) {
+        if (target) {
+            static const char* kInputTypeReplaceText = "replaceText";
+            RefPtrWillBeRawPtr<InputEvent> beforeInputEvent = InputEvent::createBeforeInput(kInputTypeReplaceText, data);

[chongz, 2016/03/04 19:46:50]

I'm not so sure about the inputType we want to use here?

+            return target->dispatchEvent(beforeInputEvent);
+        }
+    }
+    return DispatchEventResult::NotCanceled;
+}
+
 } // namespace blink