/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Novell code.
 *
 * The Initial Developer of the Original Code is
 * Novell Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Robert O'Callahan <robert@ocallahan.org>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsClientRect.h"
#include "nsContentUtils.h"
#include "nsDOMClassInfoID.h"

#include "nsPresContext.h"
#include "dombindings.h"

DOMCI_DATA(ClientRect, nsClientRect)

NS_INTERFACE_TABLE_HEAD(nsClientRect)
  NS_INTERFACE_TABLE1(nsClientRect, nsIDOMClientRect)
  NS_INTERFACE_TABLE_TO_MAP_SEGUE
  NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(ClientRect)
NS_INTERFACE_MAP_END

NS_IMPL_ADDREF(nsClientRect)
NS_IMPL_RELEASE(nsClientRect)

nsClientRect::nsClientRect()
  : mX(0.0), mY(0.0), mWidth(0.0), mHeight(0.0)
{
}

NS_IMETHODIMP
nsClientRect::GetLeft(float* aResult)
{
  *aResult = mX;
  return NS_OK;
}

NS_IMETHODIMP
nsClientRect::GetTop(float* aResult)
{
  *aResult = mY;
  return NS_OK;
}

NS_IMETHODIMP
nsClientRect::GetRight(float* aResult)
{
  *aResult = mX + mWidth;
  return NS_OK;
}

NS_IMETHODIMP
nsClientRect::GetBottom(float* aResult)
{
  *aResult = mY + mHeight;
  return NS_OK;
}

NS_IMETHODIMP
nsClientRect::GetWidth(float* aResult)
{
  *aResult = mWidth;
  return NS_OK;
}

NS_IMETHODIMP
nsClientRect::GetHeight(float* aResult)
{
  *aResult = mHeight;
  return NS_OK;
}

DOMCI_DATA(ClientRectList, nsClientRectList)

NS_IMPL_CYCLE_COLLECTION_CLASS(nsClientRectList)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsClientRectList)
  NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mParent)
  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsClientRectList)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mParent)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsClientRectList)
  NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_TRACE_END

NS_INTERFACE_TABLE_HEAD(nsClientRectList)
  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  NS_INTERFACE_TABLE1(nsClientRectList, nsIDOMClientRectList)
  NS_INTERFACE_TABLE_TO_MAP_SEGUE_CYCLE_COLLECTION(nsClientRectList)
  NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(ClientRectList)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(nsClientRectList)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsClientRectList)


NS_IMETHODIMP    
nsClientRectList::GetLength(PRUint32* aLength)
{
  *aLength = mArray.Count();
  return NS_OK;
}

NS_IMETHODIMP    
nsClientRectList::Item(PRUint32 aIndex, nsIDOMClientRect** aReturn)
{
  NS_IF_ADDREF(*aReturn = nsClientRectList::GetItemAt(aIndex));
  return NS_OK;
}

nsIDOMClientRect*
nsClientRectList::GetItemAt(PRUint32 aIndex)
{
  return mArray.SafeObjectAt(aIndex);
}

JSObject*
nsClientRectList::WrapObject(JSContext *cx, XPCWrappedNativeScope *scope,
                             bool *triedToWrap)
{
  return mozilla::dom::binding::ClientRectList::create(cx, scope, this,
                                                       triedToWrap);
}

static double
RoundFloat(double aValue)
{
  return floor(aValue + 0.5);
}

void
nsClientRect::SetLayoutRect(const nsRect& aLayoutRect)
{
  double scale = 65536.0;
  // Round to the nearest 1/scale units. We choose scale so it can be represented
  // exactly by machine floating point.
  double scaleInv = 1/scale;
  double t2pScaled = scale/nsPresContext::AppUnitsPerCSSPixel();
  double x = RoundFloat(aLayoutRect.x*t2pScaled)*scaleInv;
  double y = RoundFloat(aLayoutRect.y*t2pScaled)*scaleInv;
  SetRect(x, y, RoundFloat(aLayoutRect.XMost()*t2pScaled)*scaleInv - x,
          RoundFloat(aLayoutRect.YMost()*t2pScaled)*scaleInv - y);
}
