chrome/browser/chromeos/accessibility/spoken_feedback_event_rewriter.h

   1 // Copyright 2015 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 CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_SPOKEN_FEEDBACK_EVENT_REWRITER_H_
   6 #define CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_SPOKEN_FEEDBACK_EVENT_REWRITER_H_
   7
   8 #include <vector>
   9
  10 #include "ui/events/event_rewriter.h"
  11
  12 namespace ui {
  13 class KeyEvent;
  14 }
  15
  16 // Receives requests for spoken feedback enabled state and command dispatch.
  17 class SpokenFeedbackEventRewriterDelegate {
  18  public:
  19   SpokenFeedbackEventRewriterDelegate();
  20   virtual ~SpokenFeedbackEventRewriterDelegate() {}
  21
  22   // Returns true when ChromeVox is enabled.
  23   virtual bool IsSpokenFeedbackEnabled() const;
  24
  25   // Returns true when |key_event| is dispatched to ChromeVox.
  26   virtual bool DispatchKeyEventToChromeVox(const ui::KeyEvent& key_event);
  27
  28  private:
  29   // Whether the user previously hit a sequencing prefix command.
  30   bool is_sequencing_;
  31
  32   DISALLOW_COPY_AND_ASSIGN(SpokenFeedbackEventRewriterDelegate);
  33 };
  34
  35 // SpokenFeedbackEventRewriter discards all keyboard events mapped by the spoken
  36 // feedback manifest commands block. It dispatches the associated command name
  37 // directly to spoken feedback. This only occurs whenever spoken feedback is
  38 // enabled.
  39 class SpokenFeedbackEventRewriter : public ui::EventRewriter {
  40  public:
  41   SpokenFeedbackEventRewriter();
  42   ~SpokenFeedbackEventRewriter() override;
  43
  44   void SetDelegateForTest(
  45       scoped_ptr<SpokenFeedbackEventRewriterDelegate> delegate);
  46
  47  private:
  48   // EventRewriter:
  49   ui::EventRewriteStatus RewriteEvent(
  50       const ui::Event& event,
  51       scoped_ptr<ui::Event>* new_event) override;
  52   ui::EventRewriteStatus NextDispatchEvent(
  53       const ui::Event& last_event,
  54       scoped_ptr<ui::Event>* new_event) override;
  55
  56   // Active delegate (used for testing).
  57   scoped_ptr<SpokenFeedbackEventRewriterDelegate> delegate_;
  58
  59   // Stores all key codes we've captured.
  60   std::vector<int> captured_key_codes_;
  61
  62   DISALLOW_COPY_AND_ASSIGN(SpokenFeedbackEventRewriter);
  63 };
  64
  65 #endif  // CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_SPOKEN_FEEDBACK_EVENT_REWRITER_H_