1 files changed, 39 insertions, 0 deletions
diff --git a/toolkit/components/antitracking/SettingsChangeObserver.h b/toolkit/components/antitracking/SettingsChangeObserver.h
new file mode 100644
index 0000000000..961942deac
--- /dev/null
+++ b/toolkit/components/antitracking/SettingsChangeObserver.h
@@ -0,0 +1,39 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_settingschangeobserver_h
+#define mozilla_settingschangeobserver_h
+
+#include "nsIObserver.h"
+
+#include <functional>
+
+namespace mozilla {
+
+class SettingsChangeObserver final : public nsIObserver {
+  ~SettingsChangeObserver() = default;
+
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIOBSERVER
+
+  // This API allows consumers to get notified when the anti-tracking component
+  // settings change.  After this callback is called, an anti-tracking check
+  // that has been previously performed with the same parameters may now return
+  // a different result.
+  using AntiTrackingSettingsChangedCallback = std::function<void()>;
+  static void OnAntiTrackingSettingsChanged(
+      const AntiTrackingSettingsChangedCallback& aCallback);
+
+  static void PrivacyPrefChanged(const char* aPref = nullptr, void* = nullptr);
+
+ private:
+  static void RunAntiTrackingSettingsChangedCallbacks();
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_settingschangeobserver_h