ash/event_rewriter_delegate.h

   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_