host_status_provider.h 2.4 KB

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  1. // Copyright 2018 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. #ifndef ASH_SERVICES_MULTIDEVICE_SETUP_HOST_STATUS_PROVIDER_H_
  5. #define ASH_SERVICES_MULTIDEVICE_SETUP_HOST_STATUS_PROVIDER_H_
  6. #include "ash/components/multidevice/remote_device_ref.h"
  7. #include "ash/services/multidevice_setup/public/mojom/multidevice_setup.mojom.h"
  8. #include "base/observer_list.h"
  9. #include "third_party/abseil-cpp/absl/types/optional.h"
  10. namespace ash {
  11. namespace multidevice_setup {
  12. // Provides the status of the current MultiDevice host, if it exists.
  13. // Additionally, provides an observer interface for being notified when the host
  14. // status changes.
  15. class HostStatusProvider {
  16. public:
  17. class HostStatusWithDevice {
  18. public:
  19. HostStatusWithDevice(
  20. mojom::HostStatus host_status,
  21. const absl::optional<multidevice::RemoteDeviceRef>& host_device);
  22. HostStatusWithDevice(const HostStatusWithDevice& other);
  23. ~HostStatusWithDevice();
  24. bool operator==(const HostStatusWithDevice& other) const;
  25. bool operator!=(const HostStatusWithDevice& other) const;
  26. mojom::HostStatus host_status() const { return host_status_; }
  27. // If host_status() is kNoEligibleHosts or
  28. // kEligibleHostExistsButNoHostSet, host_device() is null.
  29. const absl::optional<multidevice::RemoteDeviceRef>& host_device() const {
  30. return host_device_;
  31. }
  32. private:
  33. mojom::HostStatus host_status_;
  34. absl::optional<multidevice::RemoteDeviceRef> host_device_;
  35. };
  36. class Observer {
  37. public:
  38. virtual ~Observer() = default;
  39. virtual void OnHostStatusChange(
  40. const HostStatusWithDevice& host_status_with_device) = 0;
  41. };
  42. HostStatusProvider(const HostStatusProvider&) = delete;
  43. HostStatusProvider& operator=(const HostStatusProvider&) = delete;
  44. virtual ~HostStatusProvider();
  45. virtual HostStatusWithDevice GetHostWithStatus() const = 0;
  46. void AddObserver(Observer* observer);
  47. void RemoveObserver(Observer* observer);
  48. protected:
  49. HostStatusProvider();
  50. void NotifyHostStatusChange(
  51. mojom::HostStatus host_status,
  52. const absl::optional<multidevice::RemoteDeviceRef>& host_device);
  53. private:
  54. base::ObserverList<Observer>::Unchecked observer_list_;
  55. };
  56. } // namespace multidevice_setup
  57. } // namespace ash
  58. #endif // ASH_SERVICES_MULTIDEVICE_SETUP_HOST_STATUS_PROVIDER_H_