1 files changed, 98 insertions, 0 deletions
diff --git a/dom/events/DragEvent.cpp b/dom/events/DragEvent.cpp
new file mode 100644
index 0000000000..aa576e2f8e
--- /dev/null
+++ b/dom/events/DragEvent.cpp
@@ -0,0 +1,98 @@
+/* -*- 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/. */
+
+#include "mozilla/dom/DragEvent.h"
+#include "mozilla/dom/MouseEventBinding.h"
+#include "mozilla/MouseEvents.h"
+#include "nsContentUtils.h"
+#include "prtime.h"
+
+namespace mozilla::dom {
+
+DragEvent::DragEvent(EventTarget* aOwner, nsPresContext* aPresContext,
+                     WidgetDragEvent* aEvent)
+    : MouseEvent(
+          aOwner, aPresContext,
+          aEvent ? aEvent : new WidgetDragEvent(false, eVoidEvent, nullptr)) {
+  if (aEvent) {
+    mEventIsInternal = false;
+  } else {
+    mEventIsInternal = true;
+    mEvent->mRefPoint = LayoutDeviceIntPoint(0, 0);
+    mEvent->AsMouseEvent()->mInputSource =
+        MouseEvent_Binding::MOZ_SOURCE_UNKNOWN;
+  }
+}
+
+void DragEvent::InitDragEvent(const nsAString& aType, bool aCanBubble,
+                              bool aCancelable, nsGlobalWindowInner* aView,
+                              int32_t aDetail, int32_t aScreenX,
+                              int32_t aScreenY, int32_t aClientX,
+                              int32_t aClientY, bool aCtrlKey, bool aAltKey,
+                              bool aShiftKey, bool aMetaKey, uint16_t aButton,
+                              EventTarget* aRelatedTarget,
+                              DataTransfer* aDataTransfer) {
+  NS_ENSURE_TRUE_VOID(!mEvent->mFlags.mIsBeingDispatched);
+
+  MouseEvent::InitMouseEvent(aType, aCanBubble, aCancelable, aView, aDetail,
+                             aScreenX, aScreenY, aClientX, aClientY, aCtrlKey,
+                             aAltKey, aShiftKey, aMetaKey, aButton,
+                             aRelatedTarget);
+  if (mEventIsInternal) {
+    mEvent->AsDragEvent()->mDataTransfer = aDataTransfer;
+  }
+}
+
+DataTransfer* DragEvent::GetDataTransfer() {
+  // the dataTransfer field of the event caches the DataTransfer associated
+  // with the drag. It is initialized when an attempt is made to retrieve it
+  // rather that when the event is created to avoid duplicating the data when
+  // no listener ever uses it.
+  if (!mEvent || mEvent->mClass != eDragEventClass) {
+    NS_WARNING("Tried to get dataTransfer from non-drag event!");
+    return nullptr;
+  }
+
+  WidgetDragEvent* dragEvent = mEvent->AsDragEvent();
+  // for synthetic events, just use the supplied data transfer object even if
+  // null
+  if (!mEventIsInternal) {
+    nsresult rv = nsContentUtils::SetDataTransferInEvent(dragEvent);
+    NS_ENSURE_SUCCESS(rv, nullptr);
+  }
+
+  return dragEvent->mDataTransfer;
+}
+
+// static
+already_AddRefed<DragEvent> DragEvent::Constructor(
+    const GlobalObject& aGlobal, const nsAString& aType,
+    const DragEventInit& aParam) {
+  nsCOMPtr<EventTarget> t = do_QueryInterface(aGlobal.GetAsSupports());
+  RefPtr<DragEvent> e = new DragEvent(t, nullptr, nullptr);
+  bool trusted = e->Init(t);
+  e->InitDragEvent(aType, aParam.mBubbles, aParam.mCancelable, aParam.mView,
+                   aParam.mDetail, aParam.mScreenX, aParam.mScreenY,
+                   aParam.mClientX, aParam.mClientY, aParam.mCtrlKey,
+                   aParam.mAltKey, aParam.mShiftKey, aParam.mMetaKey,
+                   aParam.mButton, aParam.mRelatedTarget, aParam.mDataTransfer);
+  e->InitializeExtraMouseEventDictionaryMembers(aParam);
+  e->SetTrusted(trusted);
+  e->SetComposed(aParam.mComposed);
+  return e.forget();
+}
+
+}  // namespace mozilla::dom
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+already_AddRefed<DragEvent> NS_NewDOMDragEvent(EventTarget* aOwner,
+                                               nsPresContext* aPresContext,
+                                               WidgetDragEvent* aEvent) {
+  RefPtr<DragEvent> event = new DragEvent(aOwner, aPresContext, aEvent);
+  return event.forget();
+}