1 files changed, 122 insertions, 0 deletions
diff --git a/dom/events/UIEvent.h b/dom/events/UIEvent.h
new file mode 100644
index 0000000000..3ccf041591
--- /dev/null
+++ b/dom/events/UIEvent.h
@@ -0,0 +1,122 @@
+/* -*- 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_UIEvent_h_
+#define mozilla_dom_UIEvent_h_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/Event.h"
+#include "mozilla/dom/Nullable.h"
+#include "mozilla/dom/UIEventBinding.h"
+#include "mozilla/dom/WindowProxyHolder.h"
+#include "nsDeviceContext.h"
+#include "nsDocShell.h"
+#include "nsIContent.h"
+#include "nsPresContext.h"
+
+class nsINode;
+
+namespace mozilla::dom {
+
+class UIEvent : public Event {
+ public:
+  UIEvent(EventTarget* aOwner, nsPresContext* aPresContext,
+          WidgetGUIEvent* aEvent);
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(UIEvent, Event)
+
+  void DuplicatePrivateData() override;
+  void Serialize(IPC::MessageWriter* aWriter,
+                 bool aSerializeInterfaceType) override;
+  bool Deserialize(IPC::MessageReader* aReader) override;
+
+  static already_AddRefed<UIEvent> Constructor(const GlobalObject& aGlobal,
+                                               const nsAString& aType,
+                                               const UIEventInit& aParam);
+
+  virtual JSObject* WrapObjectInternal(
+      JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override {
+    return UIEvent_Binding::Wrap(aCx, this, aGivenProto);
+  }
+
+  UIEvent* AsUIEvent() override { return this; }
+
+  void InitUIEvent(const nsAString& typeArg, bool canBubbleArg,
+                   bool cancelableArg, nsGlobalWindowInner* viewArg,
+                   int32_t detailArg);
+
+  Nullable<WindowProxyHolder> GetView() const {
+    if (!mView) {
+      return nullptr;
+    }
+    return WindowProxyHolder(mView->GetBrowsingContext());
+  }
+
+  int32_t Detail() const { return mDetail; }
+
+  int32_t LayerX() const { return GetLayerPoint().x; }
+
+  int32_t LayerY() const { return GetLayerPoint().y; }
+
+  virtual uint32_t Which(CallerType aCallerType = CallerType::System) {
+    MOZ_ASSERT(mEvent->mClass != eKeyboardEventClass,
+               "Key events should override Which()");
+    MOZ_ASSERT(mEvent->mClass != eMouseEventClass,
+               "Mouse events should override Which()");
+    return 0;
+  }
+
+  /**
+   * GetRangeParent() should be used only by JS.  C++ callers should use
+   * GetRangeParentContent() or GetRangeParentContentAndOffset() instead.
+   */
+  MOZ_CAN_RUN_SCRIPT already_AddRefed<nsINode> GetRangeParent() {
+    return GetRangeParentContent();
+  }
+  MOZ_CAN_RUN_SCRIPT already_AddRefed<nsIContent> GetRangeParentContent() {
+    return GetRangeParentContentAndOffset(nullptr);
+  }
+  /**
+   * aOffset is optional (i.e., can be nullptr), but when you call this with
+   * nullptr, you should use GetRangeParentContent() instead.
+   */
+  MOZ_CAN_RUN_SCRIPT already_AddRefed<nsIContent>
+  GetRangeParentContentAndOffset(int32_t* aOffset) const;
+
+  /**
+   * If you also need to compute range parent in C++ code, you should use
+   * GetRangeParentContentAndOffset() instead.
+   */
+  MOZ_CAN_RUN_SCRIPT int32_t RangeOffset() const;
+
+ protected:
+  ~UIEvent() = default;
+
+  // Internal helper functions
+  nsIntPoint GetMovementPoint();
+  nsIntPoint GetLayerPoint() const;
+
+  nsCOMPtr<nsPIDOMWindowOuter> mView;
+  int32_t mDetail;
+  CSSIntPoint mDefaultClientPoint;
+  // Screenpoint is mEvent->mRefPoint.
+  nsIntPoint mLayerPoint;
+  CSSIntPoint mPagePoint;
+  nsIntPoint mMovementPoint;
+
+  static Modifiers ComputeModifierState(const nsAString& aModifiersList);
+  bool GetModifierStateInternal(const nsAString& aKey);
+  void InitModifiers(const EventModifierInit& aParam);
+};
+
+}  // namespace mozilla::dom
+
+already_AddRefed<mozilla::dom::UIEvent> NS_NewDOMUIEvent(
+    mozilla::dom::EventTarget* aOwner, nsPresContext* aPresContext,
+    mozilla::WidgetGUIEvent* aEvent);
+
+#endif  // mozilla_dom_UIEvent_h_