1 files changed, 66 insertions, 0 deletions
diff --git a/widget/ScreenManager.h b/widget/ScreenManager.h
new file mode 100644
index 0000000000..7c40b9fcdb
--- /dev/null
+++ b/widget/ScreenManager.h
@@ -0,0 +1,66 @@
+/* -*- 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_widget_ScreenManager_h
+#define mozilla_widget_ScreenManager_h
+
+#include "nsIScreenManager.h"
+
+#include "mozilla/RefPtr.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/widget/Screen.h"
+#include "nsTArray.h"
+
+namespace mozilla {
+namespace dom {
+class ContentParent;
+class ScreenDetails;
+}  // namespace dom
+}  // namespace mozilla
+
+namespace mozilla::widget {
+
+class ScreenManager final : public nsIScreenManager {
+ public:
+  class Helper {
+   public:
+    virtual ~Helper() = default;
+  };
+
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSISCREENMANAGER
+
+  static ScreenManager& GetSingleton();
+  static already_AddRefed<ScreenManager> GetAddRefedSingleton();
+
+  void SetHelper(UniquePtr<Helper> aHelper);
+  static void Refresh(nsTArray<RefPtr<Screen>>&& aScreens);
+  void Refresh(nsTArray<mozilla::dom::ScreenDetails>&& aScreens);
+  void CopyScreensToRemote(mozilla::dom::ContentParent* aContentParent);
+  already_AddRefed<Screen> GetPrimaryScreen();
+  already_AddRefed<Screen> ScreenForRect(const DesktopIntRect& aRect);
+
+  const nsTArray<RefPtr<Screen>>& CurrentScreenList() const {
+    return mScreenList;
+  }
+
+ private:
+  ScreenManager();
+  virtual ~ScreenManager();
+
+  void RefreshInternal(nsTArray<RefPtr<Screen>>&& aScreens);
+  template <class Range>
+  void CopyScreensToRemoteRange(Range aRemoteRange);
+  void CopyScreensToAllRemotesIfIsParent();
+
+  AutoTArray<RefPtr<Screen>, 4> mScreenList;
+  UniquePtr<Helper> mHelper;
+};
+
+}  // namespace mozilla::widget
+
+#endif  // mozilla_widget_ScreenManager_h