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nsDOMMouseScrollEvent.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * The contents of this file are subject to the Mozilla Public License Version
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 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Markus Stange <mstange@themasta.com>
 * Portions created by the Initial Developer are Copyright (C) 2008
 * the Initial Developer. All Rights Reserved.
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#include "nsDOMMouseScrollEvent.h"
#include "nsGUIEvent.h"
#include "nsIContent.h"
#include "nsIEventStateManager.h"
#include "nsContentUtils.h"

nsDOMMouseScrollEvent::nsDOMMouseScrollEvent(nsPresContext* aPresContext,
                                             nsInputEvent* aEvent)
  : nsDOMMouseEvent(aPresContext, aEvent ? aEvent :
                                  new nsMouseScrollEvent(PR_FALSE, 0, nsnull))
{
  if (aEvent) {
    mEventIsInternal = PR_FALSE;
  } else {
    mEventIsInternal = PR_TRUE;
    mEvent->time = PR_Now();
    mEvent->refPoint.x = mEvent->refPoint.y = 0;
  }

  if(mEvent->eventStructType == NS_MOUSE_SCROLL_EVENT) {
    nsMouseScrollEvent* mouseEvent = static_cast<nsMouseScrollEvent*>(mEvent);
    mDetail = mouseEvent->delta;
  }
}

nsDOMMouseScrollEvent::~nsDOMMouseScrollEvent()
{
  if (mEventIsInternal && mEvent) {
    switch (mEvent->eventStructType)
    {
      case NS_MOUSE_SCROLL_EVENT:
        delete static_cast<nsMouseScrollEvent*>(mEvent);
        break;
      default:
        delete mEvent;
        break;
    }
    mEvent = nsnull;
  }
}

NS_IMPL_ADDREF_INHERITED(nsDOMMouseScrollEvent, nsDOMMouseEvent)
NS_IMPL_RELEASE_INHERITED(nsDOMMouseScrollEvent, nsDOMMouseEvent)

NS_INTERFACE_MAP_BEGIN(nsDOMMouseScrollEvent)
  NS_INTERFACE_MAP_ENTRY(nsIDOMMouseScrollEvent)
  NS_INTERFACE_MAP_ENTRY_CONTENT_CLASSINFO(MouseScrollEvent)
NS_INTERFACE_MAP_END_INHERITING(nsDOMMouseEvent)

NS_IMETHODIMP
nsDOMMouseScrollEvent::InitMouseScrollEvent(const nsAString & aType, PRBool aCanBubble, PRBool aCancelable,
                                nsIDOMAbstractView *aView, PRInt32 aDetail, PRInt32 aScreenX, 
                                PRInt32 aScreenY, PRInt32 aClientX, PRInt32 aClientY, 
                                PRBool aCtrlKey, PRBool aAltKey, PRBool aShiftKey, 
                                PRBool aMetaKey, PRUint16 aButton, nsIDOMEventTarget *aRelatedTarget,
                                PRInt32 aAxis)
{
  nsresult rv = nsDOMMouseEvent::InitMouseEvent(aType, aCanBubble, aCancelable, aView, aDetail,
                                                aScreenX, aScreenY, aClientX, aClientY, aCtrlKey,
                                                aAltKey, aShiftKey, aMetaKey, aButton, aRelatedTarget);
  NS_ENSURE_SUCCESS(rv, rv);
  
  if (mEvent->eventStructType == NS_MOUSE_SCROLL_EVENT) {
    static_cast<nsMouseScrollEvent*>(mEvent)->scrollFlags =
        (aAxis == HORIZONTAL_AXIS) ? nsMouseScrollEvent::kIsHorizontal
                                   : nsMouseScrollEvent::kIsVertical;
  }

  return NS_OK;
}


NS_IMETHODIMP
nsDOMMouseScrollEvent::GetAxis(PRInt32* aResult)
{
  NS_ENSURE_ARG_POINTER(aResult);

  if (mEvent->eventStructType == NS_MOUSE_SCROLL_EVENT) {
    PRUint32 flags = static_cast<nsMouseScrollEvent*>(mEvent)->scrollFlags;
    *aResult = (flags & nsMouseScrollEvent::kIsHorizontal)
         ? PRInt32(HORIZONTAL_AXIS) : PRInt32(VERTICAL_AXIS);
  } else {
    *aResult = 0;
  }
  return NS_OK;
}

nsresult NS_NewDOMMouseScrollEvent(nsIDOMEvent** aInstancePtrResult,
                                   nsPresContext* aPresContext,
                                   nsInputEvent *aEvent) 
{
  nsDOMMouseScrollEvent* it = new nsDOMMouseScrollEvent(aPresContext, aEvent);
  if (nsnull == it) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  return CallQueryInterface(it, aInstancePtrResult);
}

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