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

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

 // 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.
 
 #ifndef InputEvent_h
 #define InputEvent_h
 
 #include "core/events/InputEventInit.h"
 #include "core/events/UIEvent.h"
 
 namespace blink {
 
 class InputEvent final : public UIEvent {
     DEFINE_WRAPPERTYPEINFO();
 
 public:
     static InputEvent* create()
     {
         return new InputEvent;
     }
 
     static InputEvent* create(const AtomicString& type, const InputEventInit& initializer)
     {
         return new InputEvent(type, initializer);
     }
 
+    enum class InputType {
+        None,
+        InsertText,
+        ReplaceContent,
+        DeleteContent,
+        DeleteComposedCharacter,
+        Undo,
+        Redo,
+
+        // Add new input types immediately above this line.
+        NumberOfInputTypes,
+    };
+
+    enum EventCancelable : bool {
+        NotCancelable = false,
+        IsCancelable = true,
+    };
+
+    static InputEvent* createBeforeInput(InputType, const String& data, EventCancelable);
+
+    String inputType() const;
+    const String& data() const { return m_data; }
+
     bool isInputEvent() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     InputEvent();
     InputEvent(const AtomicString&, const InputEventInit&);
+
+    InputType m_inputType;
+    String m_data;
 };
 
 DEFINE_EVENT_TYPE_CASTS(InputEvent);
 
 } // namespace blink
 
 #endif // InputEvent_h