1 files changed, 147 insertions, 0 deletions
diff --git a/dom/events/WheelEvent.cpp b/dom/events/WheelEvent.cpp
new file mode 100644
index 000000000..de6c9445a
--- /dev/null
+++ b/dom/events/WheelEvent.cpp
@@ -0,0 +1,147 @@
+/* -*- 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/WheelEvent.h"
+#include "mozilla/MouseEvents.h"
+#include "prtime.h"
+
+namespace mozilla {
+namespace dom {
+
+WheelEvent::WheelEvent(EventTarget* aOwner,
+                       nsPresContext* aPresContext,
+                       WidgetWheelEvent* aWheelEvent)
+  : MouseEvent(aOwner, aPresContext,
+               aWheelEvent ? aWheelEvent :
+                             new WidgetWheelEvent(false, eVoidEvent, nullptr))
+  , mAppUnitsPerDevPixel(0)
+{
+  if (aWheelEvent) {
+    mEventIsInternal = false;
+    // If the delta mode is pixel, the WidgetWheelEvent's delta values are in
+    // device pixels.  However, JS contents need the delta values in CSS pixels.
+    // We should store the value of mAppUnitsPerDevPixel here because
+    // it might be changed by changing zoom or something.
+    if (aWheelEvent->mDeltaMode == nsIDOMWheelEvent::DOM_DELTA_PIXEL) {
+      mAppUnitsPerDevPixel = aPresContext->AppUnitsPerDevPixel();
+    }
+  } else {
+    mEventIsInternal = true;
+    mEvent->mTime = PR_Now();
+    mEvent->mRefPoint = LayoutDeviceIntPoint(0, 0);
+    mEvent->AsWheelEvent()->inputSource = nsIDOMMouseEvent::MOZ_SOURCE_UNKNOWN;
+  }
+}
+
+NS_IMPL_ADDREF_INHERITED(WheelEvent, MouseEvent)
+NS_IMPL_RELEASE_INHERITED(WheelEvent, MouseEvent)
+
+NS_INTERFACE_MAP_BEGIN(WheelEvent)
+NS_INTERFACE_MAP_END_INHERITING(MouseEvent)
+
+void
+WheelEvent::InitWheelEvent(const nsAString& aType,
+                           bool aCanBubble,
+                           bool aCancelable,
+                           nsGlobalWindow* aView,
+                           int32_t aDetail,
+                           int32_t aScreenX,
+                           int32_t aScreenY,
+                           int32_t aClientX,
+                           int32_t aClientY, 
+                           uint16_t aButton,
+                           EventTarget* aRelatedTarget,
+                           const nsAString& aModifiersList,
+                           double aDeltaX,
+                           double aDeltaY,
+                           double aDeltaZ,
+                           uint32_t aDeltaMode)
+{
+  NS_ENSURE_TRUE_VOID(!mEvent->mFlags.mIsBeingDispatched);
+
+  MouseEvent::InitMouseEvent(aType, aCanBubble, aCancelable, aView, aDetail,
+                             aScreenX, aScreenY, aClientX, aClientY, aButton,
+                             aRelatedTarget, aModifiersList);
+
+  WidgetWheelEvent* wheelEvent = mEvent->AsWheelEvent();
+  wheelEvent->mDeltaX = aDeltaX;
+  wheelEvent->mDeltaY = aDeltaY;
+  wheelEvent->mDeltaZ = aDeltaZ;
+  wheelEvent->mDeltaMode = aDeltaMode;
+}
+
+double
+WheelEvent::DeltaX()
+{
+  if (!mAppUnitsPerDevPixel) {
+    return mEvent->AsWheelEvent()->mDeltaX;
+  }
+  return mEvent->AsWheelEvent()->mDeltaX *
+    mAppUnitsPerDevPixel / nsPresContext::AppUnitsPerCSSPixel();
+}
+
+double
+WheelEvent::DeltaY()
+{
+  if (!mAppUnitsPerDevPixel) {
+    return mEvent->AsWheelEvent()->mDeltaY;
+  }
+  return mEvent->AsWheelEvent()->mDeltaY *
+    mAppUnitsPerDevPixel / nsPresContext::AppUnitsPerCSSPixel();
+}
+
+double
+WheelEvent::DeltaZ()
+{
+  if (!mAppUnitsPerDevPixel) {
+    return mEvent->AsWheelEvent()->mDeltaZ;
+  }
+  return mEvent->AsWheelEvent()->mDeltaZ *
+    mAppUnitsPerDevPixel / nsPresContext::AppUnitsPerCSSPixel();
+}
+
+uint32_t
+WheelEvent::DeltaMode()
+{
+  return mEvent->AsWheelEvent()->mDeltaMode;
+}
+
+already_AddRefed<WheelEvent>
+WheelEvent::Constructor(const GlobalObject& aGlobal,
+                        const nsAString& aType,
+                        const WheelEventInit& aParam,
+                        ErrorResult& aRv)
+{
+  nsCOMPtr<EventTarget> t = do_QueryInterface(aGlobal.GetAsSupports());
+  RefPtr<WheelEvent> e = new WheelEvent(t, nullptr, nullptr);
+  bool trusted = e->Init(t);
+  e->InitWheelEvent(aType, aParam.mBubbles, aParam.mCancelable,
+                    aParam.mView, aParam.mDetail,
+                    aParam.mScreenX, aParam.mScreenY,
+                    aParam.mClientX, aParam.mClientY,
+                    aParam.mButton, aParam.mRelatedTarget,
+                    EmptyString(), aParam.mDeltaX,
+                    aParam.mDeltaY, aParam.mDeltaZ, aParam.mDeltaMode);
+  e->InitializeExtraMouseEventDictionaryMembers(aParam);
+  e->SetTrusted(trusted);
+  e->SetComposed(aParam.mComposed);
+  return e.forget();
+}
+
+} // namespace dom
+} // namespace mozilla
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+already_AddRefed<WheelEvent>
+NS_NewDOMWheelEvent(EventTarget* aOwner,
+                    nsPresContext* aPresContext,
+                    WidgetWheelEvent* aEvent)
+{
+  RefPtr<WheelEvent> it = new WheelEvent(aOwner, aPresContext, aEvent);
+  return it.forget();
+}