1 files changed, 43 insertions, 0 deletions
diff --git a/dom/xul/ChromeObserver.h b/dom/xul/ChromeObserver.h
new file mode 100644
index 0000000000..af897c4420
--- /dev/null
+++ b/dom/xul/ChromeObserver.h
@@ -0,0 +1,43 @@
+/* -*- 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_dom_ChromeObserver_h
+#define mozilla_dom_ChromeObserver_h
+
+#include "nsStubMutationObserver.h"
+
+class nsIWidget;
+
+namespace mozilla::dom {
+class Document;
+
+class ChromeObserver final : public nsStubMutationObserver {
+ public:
+  NS_DECL_ISUPPORTS
+
+  explicit ChromeObserver(Document* aDocument);
+  void Init();
+
+  NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
+  NS_DECL_NSIMUTATIONOBSERVER_NODEWILLBEDESTROYED
+
+ protected:
+  nsIWidget* GetWindowWidget();
+  void SetDrawsInTitlebar(bool aState);
+  void SetDrawsTitle(bool aState);
+  void SetChromeMargins(const nsAttrValue* aValue);
+  nsresult HideWindowChrome(bool aShouldHide);
+
+ private:
+  void ResetChromeMargins();
+  ~ChromeObserver();
+  // A weak pointer cleared when the element will be destroyed.
+  Document* MOZ_NON_OWNING_REF mDocument;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_ChromeObserver_h