1 files changed, 62 insertions, 0 deletions
diff --git a/dom/xul/XULResizerElement.h b/dom/xul/XULResizerElement.h
new file mode 100644
index 0000000000..f7c9e4d75d
--- /dev/null
+++ b/dom/xul/XULResizerElement.h
@@ -0,0 +1,62 @@
+/* -*- 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_XULResizerElement_h
+#define mozilla_dom_XULResizerElement_h
+
+#include "nsXULElement.h"
+#include "Units.h"
+
+namespace mozilla::dom {
+
+nsXULElement* NS_NewXULResizerElement(
+    already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);
+
+class XULResizerElement final : public nsXULElement {
+ public:
+  explicit XULResizerElement(already_AddRefed<dom::NodeInfo>&& aNodeInfo)
+      : nsXULElement(std::move(aNodeInfo)) {}
+
+  MOZ_CAN_RUN_SCRIPT
+  nsresult PostHandleEvent(EventChainPostVisitor&) override;
+
+ private:
+  virtual ~XULResizerElement() = default;
+  JSObject* WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) final;
+
+  MOZ_CAN_RUN_SCRIPT
+  void PostHandleEventInternal(EventChainPostVisitor&);
+
+  struct Direction {
+    int8_t mHorizontal;
+    int8_t mVertical;
+  };
+  Direction GetDirection();
+
+  nsIContent* GetContentToResize() const;
+  // The current size of the content to resize (if available).
+  Maybe<nsSize> GetCurrentSize() const;
+
+  struct SizeInfo {
+    nsCString width, height;
+  };
+  static void SizeInfoDtorFunc(void* aObject, nsAtom* aPropertyName,
+                               void* aPropertyValue, void* aData);
+  static void ResizeContent(nsIContent* aContent, const Direction& aDirection,
+                            const SizeInfo& aSizeInfo,
+                            SizeInfo* aOriginalSizeInfo);
+  static void MaybePersistOriginalSize(nsIContent* aContent,
+                                       const SizeInfo& aSizeInfo);
+  static void RestoreOriginalSize(nsIContent* aContent);
+
+  nsSize mMouseDownSize;
+  LayoutDeviceIntPoint mMouseDownPoint;
+  bool mTrackingMouseMove = false;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // XULResizerElement_h