1 files changed, 72 insertions, 0 deletions
diff --git a/widget/windows/WinContentSystemParameters.h b/widget/windows/WinContentSystemParameters.h
new file mode 100644
index 0000000000..daa7db2115
--- /dev/null
+++ b/widget/windows/WinContentSystemParameters.h
@@ -0,0 +1,72 @@
+/* -*- 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_WinContentSystemParameters_h
+#define mozilla_widget_WinContentSystemParameters_h
+#include <memory>
+#include <cinttypes>
+#include "nsTArray.h"
+
+namespace mozilla {
+namespace dom {
+
+class SystemParameterKVPair;
+
+}
+
+namespace widget {
+
+enum class SystemParameterId : uint8_t {
+  IsPerMonitorDPIAware = 0,
+  SystemDPI,
+  FlatMenusEnabled,
+  IsAppThemed,
+  Count,
+};
+
+class WinContentSystemParameters {
+ public:
+  static WinContentSystemParameters* GetSingleton();
+
+  bool IsPerMonitorDPIAware();
+
+  float SystemDPI();
+
+  bool AreFlatMenusEnabled();
+
+  bool IsAppThemed();
+
+  void SetContentValues(const nsTArray<dom::SystemParameterKVPair>& values);
+
+  nsTArray<dom::SystemParameterKVPair> GetParentValues();
+
+  void OnThemeChanged();
+
+  WinContentSystemParameters(const WinContentSystemParameters&) = delete;
+  WinContentSystemParameters(WinContentSystemParameters&&) = delete;
+  WinContentSystemParameters& operator=(const WinContentSystemParameters&) =
+      delete;
+  WinContentSystemParameters& operator=(WinContentSystemParameters&&) = delete;
+
+ private:
+  WinContentSystemParameters();
+  ~WinContentSystemParameters();
+
+  void SetContentValueInternal(const dom::SystemParameterKVPair& aKVPair);
+
+  bool GetParentValueInternal(SystemParameterId aId,
+                              dom::SystemParameterKVPair* aKVPair);
+
+  bool IsCachedValueValid(SystemParameterId aId);
+  void SetCachedValueValid(SystemParameterId aId, bool aIsValid);
+
+  struct Detail;
+  std::unique_ptr<Detail> mDetail;
+};
+
+}  // namespace widget
+}  // namespace mozilla
+
+#endif  // mozilla_widget_WinContentSystemParameters_h