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 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

 /* vim: set ts=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, 0, 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->deltaMode == nsIDOMWheelEvent::DOM_DELTA_PIXEL) {

       mAppUnitsPerDevPixel = aPresContext->AppUnitsPerDevPixel();

     }

   } else {

     mEventIsInternal = true;

     mEvent->time = PR_Now();

     mEvent->refPoint.x = mEvent->refPoint.y = 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_ENTRY(nsIDOMWheelEvent)

 NS_INTERFACE_MAP_END_INHERITING(MouseEvent)

 NS_IMETHODIMP

 WheelEvent::InitWheelEvent(const nsAString& aType,

                            bool aCanBubble,

                            bool aCancelable,

                            nsIDOMWindow* aView,

                            int32_t aDetail,

                            int32_t aScreenX,

                            int32_t aScreenY,

                            int32_t aClientX,

                            int32_t aClientY, 

                            uint16_t aButton,

                            nsIDOMEventTarget* aRelatedTarget,

                            const nsAString& aModifiersList,

                            double aDeltaX,

                            double aDeltaY,

                            double aDeltaZ,

                            uint32_t aDeltaMode)

 {

   nsresult rv =

     MouseEvent::InitMouseEvent(aType, aCanBubble, aCancelable, aView, aDetail,

                                aScreenX, aScreenY, aClientX, aClientY, aButton,

                                aRelatedTarget, aModifiersList);

   NS_ENSURE_SUCCESS(rv, rv);

   WidgetWheelEvent* wheelEvent = mEvent->AsWheelEvent();

   wheelEvent->deltaX = aDeltaX;

   wheelEvent->deltaY = aDeltaY;

   wheelEvent->deltaZ = aDeltaZ;

   wheelEvent->deltaMode = aDeltaMode;

   return NS_OK;

 }

 double

 WheelEvent::DeltaX()

 {

   if (!mAppUnitsPerDevPixel) {

     return mEvent->AsWheelEvent()->deltaX;

   }

   return mEvent->AsWheelEvent()->deltaX *

     mAppUnitsPerDevPixel / nsPresContext::AppUnitsPerCSSPixel();

 }

 NS_IMETHODIMP

 WheelEvent::GetDeltaX(double* aDeltaX)

 {

   NS_ENSURE_ARG_POINTER(aDeltaX);

   *aDeltaX = DeltaX();

   return NS_OK;

 }

 double

 WheelEvent::DeltaY()

 {

   if (!mAppUnitsPerDevPixel) {

     return mEvent->AsWheelEvent()->deltaY;

   }

   return mEvent->AsWheelEvent()->deltaY *

     mAppUnitsPerDevPixel / nsPresContext::AppUnitsPerCSSPixel();

 }

 NS_IMETHODIMP

 WheelEvent::GetDeltaY(double* aDeltaY)

 {

   NS_ENSURE_ARG_POINTER(aDeltaY);

   *aDeltaY = DeltaY();

   return NS_OK;

 }

 double

 WheelEvent::DeltaZ()

 {

   if (!mAppUnitsPerDevPixel) {

     return mEvent->AsWheelEvent()->deltaZ;

   }

   return mEvent->AsWheelEvent()->deltaZ *

     mAppUnitsPerDevPixel / nsPresContext::AppUnitsPerCSSPixel();

 }

 NS_IMETHODIMP

 WheelEvent::GetDeltaZ(double* aDeltaZ)

 {

   NS_ENSURE_ARG_POINTER(aDeltaZ);

   *aDeltaZ = DeltaZ();

   return NS_OK;

 }

 uint32_t

 WheelEvent::DeltaMode()

 {

   return mEvent->AsWheelEvent()->deltaMode;

 }

 NS_IMETHODIMP

 WheelEvent::GetDeltaMode(uint32_t* aDeltaMode)

 {

   NS_ENSURE_ARG_POINTER(aDeltaMode);

   *aDeltaMode = DeltaMode();

   return NS_OK;

 }

 static void

 GetModifierList(bool aCtrl, bool aShift, bool aAlt, bool aMeta,

                 nsAString& aModifierList)

 {

   if (aCtrl) {

     aModifierList.AppendLiteral(NS_DOM_KEYNAME_CONTROL);

   }

   if (aShift) {

     if (!aModifierList.IsEmpty()) {

       aModifierList.AppendLiteral(" ");

     }

     aModifierList.AppendLiteral(NS_DOM_KEYNAME_SHIFT);

   }

   if (aAlt) {

     if (!aModifierList.IsEmpty()) {

       aModifierList.AppendLiteral(" ");

     }

     aModifierList.AppendLiteral(NS_DOM_KEYNAME_ALT);

   }

   if (aMeta) {

     if (!aModifierList.IsEmpty()) {

       aModifierList.AppendLiteral(" ");

     }

     aModifierList.AppendLiteral(NS_DOM_KEYNAME_META);

   }

 }

 already_AddRefed<WheelEvent>

 WheelEvent::Constructor(const GlobalObject& aGlobal,

                         const nsAString& aType,

                         const WheelEventInit& aParam,

                         ErrorResult& aRv)

 {

   nsCOMPtr<EventTarget> t = do_QueryInterface(aGlobal.GetAsSupports());

   nsRefPtr<WheelEvent> e = new WheelEvent(t, nullptr, nullptr);

   bool trusted = e->Init(t);

   nsAutoString modifierList;

   GetModifierList(aParam.mCtrlKey, aParam.mShiftKey,

                   aParam.mAltKey, aParam.mMetaKey,

                   modifierList);

   aRv = e->InitWheelEvent(aType, aParam.mBubbles, aParam.mCancelable,

                           aParam.mView, aParam.mDetail,

                           aParam.mScreenX, aParam.mScreenY,

                           aParam.mClientX, aParam.mClientY,

                           aParam.mButton, aParam.mRelatedTarget,

                           modifierList, aParam.mDeltaX,

                           aParam.mDeltaY, aParam.mDeltaZ, aParam.mDeltaMode);

   e->mEvent->AsWheelEvent()->buttons = aParam.mButtons;

   e->SetTrusted(trusted);

   return e.forget();

 }

 } // namespace dom

 } // namespace mozilla

 using namespace mozilla;

 using namespace mozilla::dom;

 nsresult

 NS_NewDOMWheelEvent(nsIDOMEvent** aInstancePtrResult,

                     EventTarget* aOwner,

                     nsPresContext* aPresContext,

                     WidgetWheelEvent* aEvent)

 {

   WheelEvent* it = new WheelEvent(aOwner, aPresContext, aEvent);

   NS_ADDREF(it);

   *aInstancePtrResult = static_cast<Event*>(it);

   return NS_OK;

 }