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

third_party/WebKit/Source/core/events/InputEvent.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/events/InputEvent.h"
 
 #include "core/events/EventDispatcher.h"
 
 namespace blink {
 
 InputEvent::InputEvent()
 {
 }
 
 InputEvent::InputEvent(const AtomicString& type, const InputEventInit& initializer)
     : UIEvent(type, initializer)
 {
+    if (initializer.hasInputType())
+        m_inputType = initializer.inputType();
+    if (initializer.hasData())
+        m_data = initializer.data();
+}
+
+/* static */
+PassRefPtrWillBeRawPtr<InputEvent> InputEvent::createBeforeInput(const String& inputType, const String& data)
+{
+    InputEventInit inputEventInit;
+
+    inputEventInit.setBubbles(true);
+    inputEventInit.setCancelable(false);
+    inputEventInit.setInputType(inputType);
+    inputEventInit.setData(data);
+
+    return InputEvent::create(EventTypeNames::beforeinput, inputEventInit);
+}
+
+/* static */
+PassRefPtrWillBeRawPtr<InputEvent> InputEvent::createCancelableBeforeInput(const String& inputType, const String& data)
+{
+    InputEventInit inputEventInit;
+
+    inputEventInit.setBubbles(true);
+    inputEventInit.setCancelable(true);
+    inputEventInit.setInputType(inputType);
+    inputEventInit.setData(data);
+
+    return InputEvent::create(EventTypeNames::beforeinput, inputEventInit);
 }
 
 bool InputEvent::isInputEvent() const
 {
     return true;
 }
 
 DEFINE_TRACE(InputEvent)
 {
     UIEvent::trace(visitor);
 }
 
 } // namespace blink