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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef ASH_EVENT_REWRITER_DELEGATE_H_
      6 #define ASH_EVENT_REWRITER_DELEGATE_H_
      7 
      8 namespace ui {
      9 class KeyEvent;
     10 class LocatedEvent;
     11 }  // namespace aura
     12 
     13 namespace ash {
     14 
     15 // Delegate for rewriting or filtering an event.
     16 class EventRewriterDelegate {
     17  public:
     18   enum Action {
     19     ACTION_REWRITE_EVENT,
     20     ACTION_DROP_EVENT,
     21   };
     22 
     23   virtual ~EventRewriterDelegate() {}
     24 
     25   // A derived class can do either of the following:
     26   // 1) Just return ACTION_DROP_EVENT to drop the |event|.
     27   // 2) Rewrite the |event| and return ACTION_REWRITE_EVENT.
     28   virtual Action RewriteOrFilterKeyEvent(ui::KeyEvent* event) = 0;
     29   virtual Action RewriteOrFilterLocatedEvent(ui::LocatedEvent* event) = 0;
     30 };
     31 
     32 }  // namespace ash
     33 
     34 #endif  // ASH_EVENT_REWRITER_DELEGATE_H_
     35