ash/events/keyboard_driven_event_rewriter.h

// Copyright 2013 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 ASH_EVENTS_KEYBOARD_DRIVEN_EVENT_REWRITER_H_
#define ASH_EVENTS_KEYBOARD_DRIVEN_EVENT_REWRITER_H_

#include "ash/ash_export.h"
#include "base/macros.h"
#include "ui/events/event_rewriter.h"

namespace ash {

// KeyboardDrivenEventRewriter removes the modifier flags from
// Shift+<Arrow keys|Enter|F6> key events. This mapping only happens
// on login screen and only when the keyboard driven oobe is enabled.
class ASH_EXPORT KeyboardDrivenEventRewriter : public ui::EventRewriter {
 public:
  KeyboardDrivenEventRewriter();
  ~KeyboardDrivenEventRewriter() override;

  // Calls Rewrite for testing.
  ui::EventRewriteStatus RewriteForTesting(
      const ui::Event& event,
      std::unique_ptr<ui::Event>* new_event);

  // EventRewriter overrides:
  ui::EventRewriteStatus RewriteEvent(
      const ui::Event& event,
      std::unique_ptr<ui::Event>* new_event) override;
  ui::EventRewriteStatus NextDispatchEvent(
      const ui::Event& last_event,
      std::unique_ptr<ui::Event>* new_event) override;

  void set_enabled(bool enabled) { enabled_ = enabled; }
  void set_arrow_to_tab_rewriting_enabled(bool enabled) {
    arrow_to_tab_rewriting_enabled_ = enabled;
  }

 private:
  ui::EventRewriteStatus Rewrite(const ui::Event& event,
                                 std::unique_ptr<ui::Event>* new_event);

  // If true, this rewriter is enabled. It is only active before user login.
  bool enabled_ = false;

  // If true, Shift + Arrow keys are rewritten to Tab/Shift-Tab keys.
  // This only applies when the KeyboardDrivenEventRewriter is active.
  bool arrow_to_tab_rewriting_enabled_ = false;

  DISALLOW_COPY_AND_ASSIGN(KeyboardDrivenEventRewriter);
};

}  // namespace ash

#endif  // ASH_EVENTS_KEYBOARD_DRIVEN_EVENT_REWRITER_H_