1 files changed, 35 insertions, 0 deletions
diff --git a/widget/ThemeChangeKind.h b/widget/ThemeChangeKind.h
new file mode 100644
index 0000000000..2300ea648b
--- /dev/null
+++ b/widget/ThemeChangeKind.h
@@ -0,0 +1,35 @@
+/* -*- 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_ThemeChangeKind
+#define mozilla_widget_ThemeChangeKind
+
+#include "mozilla/TypedEnumBits.h"
+
+namespace mozilla::widget {
+
+enum class ThemeChangeKind : uint8_t {
+  // This is the cheapest change, no need to forcibly recompute style and/or
+  // layout.
+  MediaQueriesOnly = 0,
+  // Style needs to forcibly be recomputed because some of the stuff that may
+  // have changed, like system colors, are reflected in the computed style but
+  // not in the specified style.
+  Style = 1 << 0,
+  // Layout needs to forcibly be recomputed because some of the stuff that may
+  // have changed is layout-dependent, like system font.
+  Layout = 1 << 1,
+  // The union of the two flags above.
+  StyleAndLayout = Style | Layout,
+  // For IPC serialization purposes.
+  AllBits = Style | Layout,
+};
+
+MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(ThemeChangeKind)
+
+}  // namespace mozilla::widget
+
+#endif