pref_change_registrar.cc 2.6 KB

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  1. // Copyright (c) 2010 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. #include "components/prefs/pref_change_registrar.h"
  5. #include "base/bind.h"
  6. #include "base/check.h"
  7. #include "base/notreached.h"
  8. #include "components/prefs/pref_service.h"
  9. PrefChangeRegistrar::PrefChangeRegistrar() : service_(nullptr) {}
  10. PrefChangeRegistrar::~PrefChangeRegistrar() {
  11. // If you see an invalid memory access in this destructor, this
  12. // PrefChangeRegistrar might be subscribed to an OffTheRecordProfileImpl that
  13. // has been destroyed. This should not happen any more but be warned.
  14. // Feel free to contact battre@chromium.org in case this happens.
  15. //
  16. // This can also happen for non-OTR profiles, when the
  17. // DestroyProfileOnBrowserClose flag is enabled. In that case, contact
  18. // nicolaso@chromium.org.
  19. RemoveAll();
  20. }
  21. void PrefChangeRegistrar::Init(PrefService* service) {
  22. DCHECK(IsEmpty() || service_ == service);
  23. service_ = service;
  24. }
  25. void PrefChangeRegistrar::Add(const std::string& path,
  26. const base::RepeatingClosure& obs) {
  27. Add(path,
  28. base::BindRepeating(&PrefChangeRegistrar::InvokeUnnamedCallback, obs));
  29. }
  30. void PrefChangeRegistrar::Add(const std::string& path,
  31. const NamedChangeCallback& obs) {
  32. if (!service_) {
  33. NOTREACHED();
  34. return;
  35. }
  36. DCHECK(!IsObserved(path)) << "Already had pref, \"" << path
  37. << "\", registered.";
  38. service_->AddPrefObserver(path, this);
  39. observers_[path] = obs;
  40. }
  41. void PrefChangeRegistrar::Remove(const std::string& path) {
  42. DCHECK(IsObserved(path));
  43. observers_.erase(path);
  44. service_->RemovePrefObserver(path, this);
  45. }
  46. void PrefChangeRegistrar::RemoveAll() {
  47. for (ObserverMap::const_iterator it = observers_.begin();
  48. it != observers_.end(); ++it) {
  49. service_->RemovePrefObserver(it->first, this);
  50. }
  51. observers_.clear();
  52. }
  53. bool PrefChangeRegistrar::IsEmpty() const {
  54. return observers_.empty();
  55. }
  56. bool PrefChangeRegistrar::IsObserved(const std::string& pref) {
  57. return observers_.find(pref) != observers_.end();
  58. }
  59. void PrefChangeRegistrar::OnPreferenceChanged(PrefService* service,
  60. const std::string& pref) {
  61. if (IsObserved(pref))
  62. observers_[pref].Run(pref);
  63. }
  64. void PrefChangeRegistrar::InvokeUnnamedCallback(
  65. const base::RepeatingClosure& callback,
  66. const std::string& pref_name) {
  67. callback.Run();
  68. }
  69. PrefService* PrefChangeRegistrar::prefs() {
  70. return service_;
  71. }
  72. const PrefService* PrefChangeRegistrar::prefs() const {
  73. return service_;
  74. }