chrome/browser/chromeos/events/event_rewriter_controller.h

   1 // Copyright 2014 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_EVENTS_EVENT_REWRITER_CONTROLLER_H_
   6 #define CHROME_BROWSER_CHROMEOS_EVENTS_EVENT_REWRITER_CONTROLLER_H_
   7
   8 #include <list>
   9 #include <vector>
  10
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/memory/scoped_vector.h"
  13 #include "ui/aura/env_observer.h"
  14 #include "ui/events/event_rewriter.h"
  15
  16 namespace ui {
  17 class EventSource;
  18 }  // namespace ui
  19
  20 namespace chromeos {
  21
  22 // Owns |ui::EventRewriter|s and ensures that they are added to all root
  23 // windows |EventSource|s, current and future, in the order that they are
  24 // added to this.
  25 class EventRewriterController : public aura::EnvObserver {
  26  public:
  27   EventRewriterController();
  28   ~EventRewriterController() override;
  29
  30   // Takes ownership of an EventRewriter; can only be called before Init().
  31   void AddEventRewriter(scoped_ptr<ui::EventRewriter> rewriter);
  32
  33   // Add rewriters to any existing root windows; must be called once only
  34   // after ash::Shell has been initialized.
  35   void Init();
  36
  37   // aura::EnvObserver overrides:
  38   void OnWindowInitialized(aura::Window* window) override {}
  39   void OnHostInitialized(aura::WindowTreeHost* host) override;
  40
  41  private:
  42   typedef std::list<ui::EventSource*> EventSourceList;
  43   typedef ScopedVector<ui::EventRewriter> EventRewriters;
  44
  45   void AddToEventSource(ui::EventSource* source);
  46
  47   // The |EventRewriter|s managed by this controller.
  48   EventRewriters rewriters_;
  49
  50   // Whether the owned event rewriters have been added to existing
  51   // root windows; after this no more rewriters can be added.
  52   bool initialized_;
  53
  54   DISALLOW_COPY_AND_ASSIGN(EventRewriterController);
  55 };
  56
  57 }  // namespace chromeos
  58
  59 #endif  // CHROME_BROWSER_CHROMEOS_EVENTS_EVENT_REWRITER_CONTROLLER_H_