gecko/content/html/content/src/nsHTMLSelectElement.cpp

/* -*- Mode: C++; 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 Mozilla Communicator client code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Pierre Phaneuf <pp@ludusdesign.com>
 *   Mats Palmgren <mats.palmgren@bredband.net>
 *
 * 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 "nsHTMLSelectElement.h"
#include "nsIDOMEventTarget.h"
#include "nsContentCreatorFunctions.h"
#include "nsGkAtoms.h"
#include "nsStyleConsts.h"
#include "nsPresContext.h"
#include "nsLayoutUtils.h"
#include "nsMappedAttributes.h"
#include "nsIForm.h"
#include "nsIFormSubmission.h"

#include "nsIDOMHTMLOptGroupElement.h"
#include "nsIOptionElement.h"
#include "nsIEventStateManager.h"
#include "nsGUIEvent.h"
#include "nsIPrivateDOMEvent.h"
#include "nsIBoxObject.h"
#include "nsIDOMNSDocument.h"
#include "nsIDOMDocumentEvent.h"

// Notify/query select frame for selectedIndex
#include "nsIDocument.h"
#include "nsIPresShell.h"
#include "nsIFormControlFrame.h"
#include "nsIComboboxControlFrame.h"
#include "nsIListControlFrame.h"
#include "nsIFrame.h"

#include "nsDOMError.h"
#include "nsRuleData.h"
#include "nsEventDispatcher.h"

NS_IMPL_ISUPPORTS1(nsSelectState, nsSelectState)
NS_DEFINE_STATIC_IID_ACCESSOR(nsSelectState, NS_SELECT_STATE_IID)

//----------------------------------------------------------------------
//
// nsSafeOptionListMutation
//

nsSafeOptionListMutation::nsSafeOptionListMutation(nsIContent* aSelect,
                                                   nsIContent* aParent,
                                                   nsIContent* aKid,
                                                   PRUint32 aIndex)
  : mSelect(do_QueryInterface(aSelect)), mTopLevelMutation(PR_FALSE),
    mNeedsRebuild(PR_FALSE)
{
  nsHTMLSelectElement* select = static_cast<nsHTMLSelectElement*>(mSelect.get());
  if (select) {
    mTopLevelMutation = !select->mMutating;
    if (mTopLevelMutation) {
      select->mMutating = PR_TRUE;
    } else {
      // This is very unfortunate, but to handle mutation events properly,
      // option list must be up-to-date before inserting or removing options.
      // Fortunately this is called only if mutation event listener
      // adds or removes options.
      select->RebuildOptionsArray();
    }
    nsresult rv;
    if (aKid) {
      rv = mSelect->WillAddOptions(aKid, aParent, aIndex);
    } else {
      rv = mSelect->WillRemoveOptions(aParent, aIndex);
    }
    mNeedsRebuild = NS_FAILED(rv);
  }
}

nsSafeOptionListMutation::~nsSafeOptionListMutation()
{
  if (mSelect) {
    nsHTMLSelectElement* select =
      static_cast<nsHTMLSelectElement*>(mSelect.get());
    if (mNeedsRebuild || (mTopLevelMutation && mGuard.Mutated(1))) {
      select->RebuildOptionsArray();
    }
    if (mTopLevelMutation) {
      select->mMutating = PR_FALSE;
    }
#ifdef DEBUG
    select->VerifyOptionsArray();
#endif
  }
}

//----------------------------------------------------------------------
//
// nsHTMLSelectElement
//

// construction, destruction


NS_IMPL_NS_NEW_HTML_ELEMENT_CHECK_PARSER(Select)

nsHTMLSelectElement::nsHTMLSelectElement(nsINodeInfo *aNodeInfo,
                                         PRBool aFromParser)
  : nsGenericHTMLFormElement(aNodeInfo),
    mOptions(new nsHTMLOptionCollection(this)),
    mIsDoneAddingChildren(!aFromParser),
    mDisabledChanged(PR_FALSE),
    mMutating(PR_FALSE),
    mNonOptionChildren(0),
    mOptGroupCount(0),
    mSelectedIndex(-1)
{
  // FIXME: Bug 328908, set mOptions in an Init function and get rid of null
  // checks.

  // DoneAddingChildren() will be called later if it's from the parser,
  // otherwise it is
}

nsHTMLSelectElement::~nsHTMLSelectElement()
{
  if (mOptions) {
    mOptions->DropReference();
  }
}

// ISupports

NS_IMPL_CYCLE_COLLECTION_CLASS(nsHTMLSelectElement)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(nsHTMLSelectElement,
                                                  nsGenericHTMLFormElement)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR_AMBIGUOUS(mOptions,
                                                       nsIDOMHTMLCollection)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMPL_ADDREF_INHERITED(nsHTMLSelectElement, nsGenericElement)
NS_IMPL_RELEASE_INHERITED(nsHTMLSelectElement, nsGenericElement)


// QueryInterface implementation for nsHTMLSelectElement
NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(nsHTMLSelectElement)
  NS_HTML_CONTENT_INTERFACE_TABLE3(nsHTMLSelectElement,
                                   nsIDOMHTMLSelectElement,
                                   nsIDOMNSHTMLSelectElement,
                                   nsISelectElement)
  NS_HTML_CONTENT_INTERFACE_TABLE_TO_MAP_SEGUE(nsHTMLSelectElement,
                                               nsGenericHTMLFormElement)
NS_HTML_CONTENT_INTERFACE_TABLE_TAIL_CLASSINFO(HTMLSelectElement)


// nsIDOMHTMLSelectElement


NS_IMPL_ELEMENT_CLONE(nsHTMLSelectElement)


NS_IMETHODIMP
nsHTMLSelectElement::GetForm(nsIDOMHTMLFormElement** aForm)
{
  return nsGenericHTMLFormElement::GetForm(aForm);
}

nsresult
nsHTMLSelectElement::InsertChildAt(nsIContent* aKid,
                                   PRUint32 aIndex,
                                   PRBool aNotify)
{
  nsSafeOptionListMutation safeMutation(this, this, aKid, aIndex);
  nsresult rv = nsGenericHTMLFormElement::InsertChildAt(aKid, aIndex, aNotify);
  if (NS_FAILED(rv)) {
    safeMutation.MutationFailed();
  }
  return rv;
}

nsresult
nsHTMLSelectElement::RemoveChildAt(PRUint32 aIndex, PRBool aNotify, PRBool aMutationEvent)
{
  NS_ASSERTION(aMutationEvent, "Someone tried to inhibit mutations on select child removal.");
  nsSafeOptionListMutation safeMutation(this, this, nsnull, aIndex);
  nsresult rv = nsGenericHTMLFormElement::RemoveChildAt(aIndex, aNotify, aMutationEvent);
  if (NS_FAILED(rv)) {
    safeMutation.MutationFailed();
  }
  return rv;
}


// SelectElement methods

nsresult
nsHTMLSelectElement::InsertOptionsIntoList(nsIContent* aOptions,
                                           PRInt32 aListIndex,
                                           PRInt32 aDepth)
{
  PRInt32 insertIndex = aListIndex;
  nsresult rv = InsertOptionsIntoListRecurse(aOptions, &insertIndex, aDepth);
  NS_ENSURE_SUCCESS(rv, rv);

  // Deal with the selected list
  if (insertIndex - aListIndex) {
    // Fix the currently selected index
    if (aListIndex <= mSelectedIndex) {
      mSelectedIndex += (insertIndex - aListIndex);
    }

    // Get the frame stuff for notification. No need to flush here
    // since if there's no frame for the select yet the select will
    // get into the right state once it's created.
    nsISelectControlFrame* selectFrame = nsnull;
    nsWeakFrame weakSelectFrame;
    PRBool didGetFrame = PR_FALSE;

    // Actually select the options if the added options warrant it
    nsCOMPtr<nsIDOMNode> optionNode;
    nsCOMPtr<nsIDOMHTMLOptionElement> option;
    for (PRInt32 i=aListIndex;i<insertIndex;i++) {
      // Notify the frame that the option is added
      if (!didGetFrame || (selectFrame && !weakSelectFrame.IsAlive())) {
        selectFrame = GetSelectFrame();
        weakSelectFrame = do_QueryFrame(selectFrame);
        didGetFrame = PR_TRUE;
      }

      if (selectFrame) {
        selectFrame->AddOption(i);
      }

      Item(i, getter_AddRefs(optionNode));
      option = do_QueryInterface(optionNode);
      if (option) {
        PRBool selected;
        option->GetSelected(&selected);
        if (selected) {
          // Clear all other options
          PRBool isMultiple;
          GetMultiple(&isMultiple);
          if (!isMultiple) {
            SetOptionsSelectedByIndex(i, i, PR_TRUE, PR_TRUE, PR_TRUE, PR_TRUE, nsnull);
          }

          // This is sort of a hack ... we need to notify that the option was
          // set and change selectedIndex even though we didn't really change
          // its value.
          OnOptionSelected(selectFrame, i, PR_TRUE, PR_FALSE, PR_FALSE);
        }
      }
    }

    CheckSelectSomething();
  }

  return NS_OK;
}

nsresult
nsHTMLSelectElement::RemoveOptionsFromList(nsIContent* aOptions,
                                           PRInt32 aListIndex,
                                           PRInt32 aDepth)
{
  PRInt32 numRemoved = 0;
  nsresult rv = RemoveOptionsFromListRecurse(aOptions, aListIndex, &numRemoved,
                                             aDepth);
  NS_ENSURE_SUCCESS(rv, rv);

  if (numRemoved) {
    // Tell the widget we removed the options
    nsISelectControlFrame* selectFrame = GetSelectFrame();
    if (selectFrame) {
      nsAutoScriptBlocker scriptBlocker;
      for (int i = aListIndex; i < aListIndex + numRemoved; ++i) {
        selectFrame->RemoveOption(i);
      }
    }

    // Fix the selected index
    if (aListIndex <= mSelectedIndex) {
      if (mSelectedIndex < (aListIndex+numRemoved)) {
        // aListIndex <= mSelectedIndex < aListIndex+numRemoved
        // Find a new selected index if it was one of the ones removed.
        FindSelectedIndex(aListIndex);
      } else {
        // Shift the selected index if something in front of it was removed
        // aListIndex+numRemoved <= mSelectedIndex
        mSelectedIndex -= numRemoved;
      }
    }

    // Select something in case we removed the selected option on a
    // single select
    CheckSelectSomething();
  }

  return NS_OK;
}

static PRBool IsOptGroup(nsIContent *aContent)
{
  return (aContent->NodeInfo()->Equals(nsGkAtoms::optgroup) &&
          aContent->IsHTML());
}

// If the document is such that recursing over these options gets us
// deeper than four levels, there is something terribly wrong with the
// world.
nsresult
nsHTMLSelectElement::InsertOptionsIntoListRecurse(nsIContent* aOptions,
                                                  PRInt32* aInsertIndex,
                                                  PRInt32 aDepth)
{
  // We *assume* here that someone's brain has not gone horribly
  // wrong by putting <option> inside of <option>.  I'm sorry, I'm
  // just not going to look for an option inside of an option.
  // Sue me.

  nsCOMPtr<nsIDOMHTMLOptionElement> optElement(do_QueryInterface(aOptions));
  if (optElement) {
    nsresult rv = mOptions->InsertOptionAt(optElement, *aInsertIndex);
    NS_ENSURE_SUCCESS(rv, rv);
    (*aInsertIndex)++;
    return NS_OK;
  }

  // If it's at the top level, then we just found out there are non-options
  // at the top level, which will throw off the insert count
  if (aDepth == 0) {
    mNonOptionChildren++;
  }

  // Recurse down into optgroups
  if (IsOptGroup(aOptions)) {
    mOptGroupCount++;

    PRUint32 numChildren = aOptions->GetChildCount();
    for (PRUint32 i = 0; i < numChildren; ++i) {
      nsresult rv = InsertOptionsIntoListRecurse(aOptions->GetChildAt(i),
                                                 aInsertIndex, aDepth+1);
      NS_ENSURE_SUCCESS(rv, rv);
    }
  }

  return NS_OK;
}

// If the document is such that recursing over these options gets us deeper than
// four levels, there is something terribly wrong with the world.
nsresult
nsHTMLSelectElement::RemoveOptionsFromListRecurse(nsIContent* aOptions,
                                                  PRInt32 aRemoveIndex,
                                                  PRInt32* aNumRemoved,
                                                  PRInt32 aDepth)
{
  // We *assume* here that someone's brain has not gone horribly
  // wrong by putting <option> inside of <option>.  I'm sorry, I'm
  // just not going to look for an option inside of an option.
  // Sue me.

  nsCOMPtr<nsIDOMHTMLOptionElement> optElement(do_QueryInterface(aOptions));
  if (optElement) {
    if (mOptions->ItemAsOption(aRemoveIndex) != optElement) {
      NS_ERROR("wrong option at index");
      return NS_ERROR_UNEXPECTED;
    }
    mOptions->RemoveOptionAt(aRemoveIndex);
    (*aNumRemoved)++;
    return NS_OK;
  }

  // Yay, one less artifact at the top level.
  if (aDepth == 0) {
    mNonOptionChildren--;
  }

  // Recurse down deeper for options
  if (mOptGroupCount && IsOptGroup(aOptions)) {
    mOptGroupCount--;

    PRUint32 numChildren = aOptions->GetChildCount();
    for (PRUint32 i = 0; i < numChildren; ++i) {
      nsresult rv = RemoveOptionsFromListRecurse(aOptions->GetChildAt(i),
                                                 aRemoveIndex,
                                                 aNumRemoved,
                                                 aDepth + 1);
      NS_ENSURE_SUCCESS(rv, rv);
    }
  }

  return NS_OK;
}

// XXXldb Doing the processing before the content nodes have been added
// to the document (as the name of this function seems to require, and
// as the callers do), is highly unusual.  Passing around unparented
// content to other parts of the app can make those things think the
// options are the root content node.
NS_IMETHODIMP
nsHTMLSelectElement::WillAddOptions(nsIContent* aOptions,
                                    nsIContent* aParent,
                                    PRInt32 aContentIndex)
{
  PRInt32 level = GetContentDepth(aParent);
  if (level == -1) {
    return NS_ERROR_FAILURE;
  }

  // Get the index where the options will be inserted
  PRInt32 ind = -1;
  if (!mNonOptionChildren) {
    // If there are no artifacts, aContentIndex == ind
    ind = aContentIndex;
  } else {
    // If there are artifacts, we have to get the index of the option the
    // hard way
    PRInt32 children = aParent->GetChildCount();

    if (aContentIndex >= children) {
      // If the content insert is after the end of the parent, then we want to get
      // the next index *after* the parent and insert there.
      ind = GetOptionIndexAfter(aParent);
    } else {
      // If the content insert is somewhere in the middle of the container, then
      // we want to get the option currently at the index and insert in front of
      // that.
      nsIContent *currentKid = aParent->GetChildAt(aContentIndex);
      NS_ASSERTION(currentKid, "Child not found!");
      if (currentKid) {
        ind = GetOptionIndexAt(currentKid);
      } else {
        ind = -1;
      }
    }
  }

  return InsertOptionsIntoList(aOptions, ind, level);
}

NS_IMETHODIMP
nsHTMLSelectElement::WillRemoveOptions(nsIContent* aParent,
                                       PRInt32 aContentIndex)
{
  PRInt32 level = GetContentDepth(aParent);
  NS_ASSERTION(level >= 0, "getting notified by unexpected content");
  if (level == -1) {
    return NS_ERROR_FAILURE;
  }

  // Get the index where the options will be removed
  nsIContent *currentKid = aParent->GetChildAt(aContentIndex);
  if (currentKid) {
    PRInt32 ind;
    if (!mNonOptionChildren) {
      // If there are no artifacts, aContentIndex == ind
      ind = aContentIndex;
    } else {
      // If there are artifacts, we have to get the index of the option the
      // hard way
      ind = GetFirstOptionIndex(currentKid);
    }
    if (ind != -1) {
      nsresult rv = RemoveOptionsFromList(currentKid, ind, level);
      NS_ENSURE_SUCCESS(rv, rv);
    }
  }

  return NS_OK;
}

PRInt32
nsHTMLSelectElement::GetContentDepth(nsIContent* aContent)
{
  nsIContent* content = aContent;

  PRInt32 retval = 0;
  while (content != this) {
    retval++;
    content = content->GetParent();
    if (!content) {
      retval = -1;
      break;
    }
  }

  return retval;
}

PRInt32
nsHTMLSelectElement::GetOptionIndexAt(nsIContent* aOptions)
{
  // Search this node and below.
  // If not found, find the first one *after* this node.
  PRInt32 retval = GetFirstOptionIndex(aOptions);
  if (retval == -1) {
    retval = GetOptionIndexAfter(aOptions);
  }

  return retval;
}

PRInt32
nsHTMLSelectElement::GetOptionIndexAfter(nsIContent* aOptions)
{
  // - If this is the select, the next option is the last.
  // - If not, search all the options after aOptions and up to the last option
  //   in the parent.
  // - If it's not there, search for the first option after the parent.
  if (aOptions == this) {
    PRUint32 len;
    GetLength(&len);
    return len;
  }

  PRInt32 retval = -1;

  nsCOMPtr<nsIContent> parent = aOptions->GetParent();

  if (parent) {
    PRInt32 index = parent->IndexOf(aOptions);
    PRInt32 count = parent->GetChildCount();

    retval = GetFirstChildOptionIndex(parent, index+1, count);

    if (retval == -1) {
      retval = GetOptionIndexAfter(parent);
    }
  }

  return retval;
}

PRInt32
nsHTMLSelectElement::GetFirstOptionIndex(nsIContent* aOptions)
{
  PRInt32 listIndex = -1;
  nsCOMPtr<nsIDOMHTMLOptionElement> optElement(do_QueryInterface(aOptions));
  if (optElement) {
    GetOptionIndex(optElement, 0, PR_TRUE, &listIndex);
    // If you nested stuff under the option, you're just plain
    // screwed.  *I'm* not going to aid and abet your evil deed.
    return listIndex;
  }

  listIndex = GetFirstChildOptionIndex(aOptions, 0, aOptions->GetChildCount());

  return listIndex;
}

PRInt32
nsHTMLSelectElement::GetFirstChildOptionIndex(nsIContent* aOptions,
                                              PRInt32 aStartIndex,
                                              PRInt32 aEndIndex)
{
  PRInt32 retval = -1;

  for (PRInt32 i = aStartIndex; i < aEndIndex; ++i) {
    retval = GetFirstOptionIndex(aOptions->GetChildAt(i));
    if (retval != -1) {
      break;
    }
  }

  return retval;
}

nsISelectControlFrame *
nsHTMLSelectElement::GetSelectFrame()
{
  nsIFormControlFrame* form_control_frame = GetFormControlFrame(PR_FALSE);

  nsISelectControlFrame *select_frame = nsnull;

  if (form_control_frame) {
    select_frame = do_QueryFrame(form_control_frame);
  }

  return select_frame;
}

NS_IMETHODIMP
nsHTMLSelectElement::Add(nsIDOMHTMLElement* aElement,
                         nsIDOMHTMLElement* aBefore)
{
  nsCOMPtr<nsIDOMNode> added;
  if (!aBefore) {
    return AppendChild(aElement, getter_AddRefs(added));
  }

  // Just in case we're not the parent, get the parent of the reference
  // element
  nsCOMPtr<nsIDOMNode> parent;
  aBefore->GetParentNode(getter_AddRefs(parent));
  if (!parent) {
    // NOT_FOUND_ERR: Raised if before is not a descendant of the SELECT
    // element.
    return NS_ERROR_DOM_NOT_FOUND_ERR;
  }

  nsCOMPtr<nsIDOMNode> ancestor(parent);
  nsCOMPtr<nsIDOMNode> temp;
  while (ancestor != static_cast<nsIDOMNode*>(this)) {
    ancestor->GetParentNode(getter_AddRefs(temp));
    if (!temp) {
      // NOT_FOUND_ERR: Raised if before is not a descendant of the SELECT
      // element.
      return NS_ERROR_DOM_NOT_FOUND_ERR;
    }
    temp.swap(ancestor);
  }

  // If the before parameter is not null, we are equivalent to the
  // insertBefore method on the parent of before.
  return parent->InsertBefore(aElement, aBefore, getter_AddRefs(added));
}

NS_IMETHODIMP
nsHTMLSelectElement::Remove(PRInt32 aIndex)
{
  nsCOMPtr<nsIDOMNode> option;
  Item(aIndex, getter_AddRefs(option));

  if (option) {
    nsCOMPtr<nsIDOMNode> parent;

    option->GetParentNode(getter_AddRefs(parent));
    if (parent) {
      nsCOMPtr<nsIDOMNode> ret;
      parent->RemoveChild(option, getter_AddRefs(ret));
    }
  }

  return NS_OK;
}

NS_IMETHODIMP
nsHTMLSelectElement::GetOptions(nsIDOMHTMLOptionsCollection** aValue)
{
  *aValue = mOptions;
  NS_IF_ADDREF(*aValue);

  return NS_OK;
}

NS_IMETHODIMP
nsHTMLSelectElement::GetType(nsAString& aType)
{
  PRBool isMultiple;
  GetMultiple(&isMultiple);
  if (isMultiple) {
    aType.AssignLiteral("select-multiple");
  }
  else {
    aType.AssignLiteral("select-one");
  }

  return NS_OK;
}

NS_IMETHODIMP
nsHTMLSelectElement::GetLength(PRUint32* aLength)
{
  return mOptions->GetLength(aLength);
}

#define MAX_DYNAMIC_SELECT_LENGTH 10000

NS_IMETHODIMP
nsHTMLSelectElement::SetLength(PRUint32 aLength)
{
  nsresult rv=NS_OK;

  PRUint32 curlen;
  PRUint32 i;

  rv = GetLength(&curlen);
  if (NS_FAILED(rv)) {
    curlen = 0;
  }

  if (curlen > aLength) { // Remove extra options
    for (i = curlen; i > aLength && NS_SUCCEEDED(rv); --i) {
      rv = Remove(i-1);
    }
  } else if (aLength > curlen) {
    if (aLength > MAX_DYNAMIC_SELECT_LENGTH) {
      return NS_ERROR_DOM_NOT_SUPPORTED_ERR;
    }
    
    // This violates the W3C DOM but we do this for backwards compatibility
    nsCOMPtr<nsINodeInfo> nodeInfo;

    nsContentUtils::NameChanged(mNodeInfo, nsGkAtoms::option,
                                getter_AddRefs(nodeInfo));

    nsCOMPtr<nsIContent> element = NS_NewHTMLOptionElement(nodeInfo);
    if (!element) {
      return NS_ERROR_OUT_OF_MEMORY;
    }

    nsCOMPtr<nsIContent> text;
    rv = NS_NewTextNode(getter_AddRefs(text), mNodeInfo->NodeInfoManager());
    NS_ENSURE_SUCCESS(rv, rv);

    rv = element->AppendChildTo(text, PR_FALSE);
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsIDOMNode> node(do_QueryInterface(element));

    for (i = curlen; i < aLength; i++) {
      nsCOMPtr<nsIDOMNode> tmpNode;

      rv = AppendChild(node, getter_AddRefs(tmpNode));
      NS_ENSURE_SUCCESS(rv, rv);

      if (i < ((PRInt32)aLength - 1)) {
        nsCOMPtr<nsIDOMNode> newNode;

        rv = node->CloneNode(PR_TRUE, getter_AddRefs(newNode));
        NS_ENSURE_SUCCESS(rv, rv);

        node = newNode;
      }
    }
  }

  return NS_OK;
}

//NS_IMPL_INT_ATTR(nsHTMLSelectElement, SelectedIndex, selectedindex)

NS_IMETHODIMP
nsHTMLSelectElement::GetSelectedIndex(PRInt32* aValue)
{
  *aValue = mSelectedIndex;

  return NS_OK;
}

NS_IMETHODIMP
nsHTMLSelectElement::SetSelectedIndex(PRInt32 aIndex)
{
  PRInt32 oldSelectedIndex = mSelectedIndex;

  nsresult rv = SetOptionsSelectedByIndex(aIndex, aIndex, PR_TRUE,
                                          PR_TRUE, PR_TRUE, PR_TRUE, nsnull);

  if (NS_SUCCEEDED(rv)) {
    nsISelectControlFrame* selectFrame = GetSelectFrame();
    if (selectFrame) {
      rv = selectFrame->OnSetSelectedIndex(oldSelectedIndex, mSelectedIndex);
    }
  }

  return rv;
}

NS_IMETHODIMP
nsHTMLSelectElement::GetOptionIndex(nsIDOMHTMLOptionElement* aOption,
                                    PRInt32 aStartIndex, PRBool aForward,
                                    PRInt32* aIndex)
{
  return mOptions->GetOptionIndex(aOption, aStartIndex, aForward, aIndex);
}

PRBool
nsHTMLSelectElement::IsOptionSelectedByIndex(PRInt32 aIndex)
{
  nsIDOMHTMLOptionElement *option = mOptions->ItemAsOption(aIndex);
  PRBool isSelected = PR_FALSE;
  if (option) {
    option->GetSelected(&isSelected);
  }
  return isSelected;
}

void
nsHTMLSelectElement::OnOptionSelected(nsISelectControlFrame* aSelectFrame,
                                      PRInt32 aIndex,
                                      PRBool aSelected,
                                      PRBool aChangeOptionState,
                                      PRBool aNotify)
{
  // Set the selected index
  if (aSelected && (aIndex < mSelectedIndex || mSelectedIndex < 0)) {
    mSelectedIndex = aIndex;
  } else if (!aSelected && aIndex == mSelectedIndex) {
    FindSelectedIndex(aIndex+1);
  }

  if (aChangeOptionState) {
    // Tell the option to get its bad self selected
    nsCOMPtr<nsIDOMNode> option;
    Item(aIndex, getter_AddRefs(option));
    if (option) {
      nsCOMPtr<nsIOptionElement> optionElement(do_QueryInterface(option));
      optionElement->SetSelectedInternal(aSelected, aNotify);
    }
  }

  // Let the frame know too
  if (aSelectFrame) {
    aSelectFrame->OnOptionSelected(aIndex, aSelected);
  }
}

void
nsHTMLSelectElement::FindSelectedIndex(PRInt32 aStartIndex)
{
  mSelectedIndex = -1;
  PRUint32 len;
  GetLength(&len);
  for (PRInt32 i=aStartIndex; i<(PRInt32)len; i++) {
    if (IsOptionSelectedByIndex(i)) {
      mSelectedIndex = i;
      break;
    }
  }
}

// XXX Consider splitting this into two functions for ease of reading:
// SelectOptionsByIndex(startIndex, endIndex, clearAll, checkDisabled)
//   startIndex, endIndex - the range of options to turn on
//                          (-1, -1) will clear all indices no matter what.
//   clearAll - will clear all other options unless checkDisabled is on
//              and all the options attempted to be set are disabled
//              (note that if it is not multiple, and an option is selected,
//              everything else will be cleared regardless).
//   checkDisabled - if this is TRUE, and an option is disabled, it will not be
//                   changed regardless of whether it is selected or not.
//                   Generally the UI passes TRUE and JS passes FALSE.
//                   (setDisabled currently is the opposite)
// DeselectOptionsByIndex(startIndex, endIndex, checkDisabled)
//   startIndex, endIndex - the range of options to turn on
//                          (-1, -1) will clear all indices no matter what.
//   checkDisabled - if this is TRUE, and an option is disabled, it will not be
//                   changed regardless of whether it is selected or not.
//                   Generally the UI passes TRUE and JS passes FALSE.
//                   (setDisabled currently is the opposite)
//
// XXXbz the above comment is pretty confusing.  Maybe we should actually
// document the args to this function too, in addition to documenting what
// things might end up looking like?  In particular, pay attention to the
// setDisabled vs checkDisabled business.
NS_IMETHODIMP
nsHTMLSelectElement::SetOptionsSelectedByIndex(PRInt32 aStartIndex,
                                               PRInt32 aEndIndex,
                                               PRBool aIsSelected,
                                               PRBool aClearAll,
                                               PRBool aSetDisabled,
                                               PRBool aNotify,
                                               PRBool* aChangedSomething)
{
#if 0
  printf("SetOption(%d-%d, %c, ClearAll=%c)\n", aStartIndex, aEndIndex,
                                       (aIsSelected ? 'Y' : 'N'),
                                       (aClearAll ? 'Y' : 'N'));
#endif
  if (aChangedSomething) {
    *aChangedSomething = PR_FALSE;
  }

  nsresult rv;

  // Don't bother if the select is disabled
  if (!aSetDisabled) {
    PRBool selectIsDisabled = PR_FALSE;
    rv = GetDisabled(&selectIsDisabled);
    if (NS_SUCCEEDED(rv) && selectIsDisabled) {
      return NS_OK;
    }
  }

  // Don't bother if there are no options
  PRUint32 numItems = 0;
  GetLength(&numItems);
  if (numItems == 0) {
    return NS_OK;
  }

  // First, find out whether multiple items can be selected
  PRBool isMultiple;
  rv = GetMultiple(&isMultiple);
  if (NS_FAILED(rv)) {
    isMultiple = PR_FALSE;
  }

  // These variables tell us whether any options were selected
  // or deselected.
  PRBool optionsSelected = PR_FALSE;
  PRBool optionsDeselected = PR_FALSE;

  nsISelectControlFrame *selectFrame = nsnull;
  PRBool didGetFrame = PR_FALSE;
  nsWeakFrame weakSelectFrame;

  if (aIsSelected) {
    // Setting selectedIndex to an out-of-bounds index means -1. (HTML5)
    if (aStartIndex >= (PRInt32)numItems || aStartIndex < 0 ||
        aEndIndex >= (PRInt32)numItems || aEndIndex < 0) {
      aStartIndex = -1;
      aEndIndex = -1;
    }

    // Only select the first value if it's not multiple
    if (!isMultiple) {
      aEndIndex = aStartIndex;
    }

    // This variable tells whether or not all of the options we attempted to
    // select are disabled.  If ClearAll is passed in as true, and we do not
    // select anything because the options are disabled, we will not clear the
    // other options.  (This is to make the UI work the way one might expect.)
    PRBool allDisabled = !aSetDisabled;

    //
    // Save a little time when clearing other options
    //
    PRInt32 previousSelectedIndex = mSelectedIndex;

    //
    // Select the requested indices
    //
    // If index is -1, everything will be deselected (bug 28143)
    if (aStartIndex != -1) {
      // Loop through the options and select them (if they are not disabled and
      // if they are not already selected).
      for (PRInt32 optIndex = aStartIndex; optIndex <= aEndIndex; optIndex++) {

        // Ignore disabled options.
        if (!aSetDisabled) {
          PRBool isDisabled;
          IsOptionDisabled(optIndex, &isDisabled);

          if (isDisabled) {
            continue;
          } else {
            allDisabled = PR_FALSE;
          }
        }

        nsIDOMHTMLOptionElement *option = mOptions->ItemAsOption(optIndex);
        if (option) {
          // If the index is already selected, ignore it.
          PRBool isSelected = PR_FALSE;
          option->GetSelected(&isSelected);
          if (!isSelected) {
            // To notify the frame if anything gets changed. No need
            // to flush here, if there's no frame yet we don't need to
            // force it to be created just to notify it about a change
            // in the select.
            selectFrame = GetSelectFrame();
            weakSelectFrame = do_QueryFrame(selectFrame);
            didGetFrame = PR_TRUE;

            OnOptionSelected(selectFrame, optIndex, PR_TRUE, PR_TRUE, aNotify);
            optionsSelected = PR_TRUE;
          }
        }
      }
    }

    // Next remove all other options if single select or all is clear
    // If index is -1, everything will be deselected (bug 28143)
    if (((!isMultiple && optionsSelected)
       || (aClearAll && !allDisabled)
       || aStartIndex == -1)
       && previousSelectedIndex != -1) {
      for (PRInt32 optIndex = previousSelectedIndex;
           optIndex < (PRInt32)numItems;
           optIndex++) {
        if (optIndex < aStartIndex || optIndex > aEndIndex) {
          nsIDOMHTMLOptionElement *option = mOptions->ItemAsOption(optIndex);
          if (option) {
            // If the index is already selected, ignore it.
            PRBool isSelected = PR_FALSE;
            option->GetSelected(&isSelected);
            if (isSelected) {
              if (!didGetFrame || (selectFrame && !weakSelectFrame.IsAlive())) {
                // To notify the frame if anything gets changed, don't
                // flush, if the frame doesn't exist we don't need to
                // create it just to tell it about this change.
                selectFrame = GetSelectFrame();
                weakSelectFrame = do_QueryFrame(selectFrame);

                didGetFrame = PR_TRUE;
              }

              OnOptionSelected(selectFrame, optIndex, PR_FALSE, PR_TRUE,
                               aNotify);
              optionsDeselected = PR_TRUE;

              // Only need to deselect one option if not multiple
              if (!isMultiple) {
                break;
              }
            }
          }
        }
      }
    }

  } else {

    // If we're deselecting, loop through all selected items and deselect
    // any that are in the specified range.
    for (PRInt32 optIndex = aStartIndex; optIndex <= aEndIndex; optIndex++) {
      if (!aSetDisabled) {
        PRBool isDisabled;
        IsOptionDisabled(optIndex, &isDisabled);
        if (isDisabled) {
          continue;
        }
      }

      nsIDOMHTMLOptionElement *option = mOptions->ItemAsOption(optIndex);
      if (option) {
        // If the index is already selected, ignore it.
        PRBool isSelected = PR_FALSE;
        option->GetSelected(&isSelected);
        if (isSelected) {
          if (!didGetFrame || (selectFrame && !weakSelectFrame.IsAlive())) {
            // To notify the frame if anything gets changed, don't
            // flush, if the frame doesn't exist we don't need to
            // create it just to tell it about this change.
            selectFrame = GetSelectFrame();
            weakSelectFrame = do_QueryFrame(selectFrame);

            didGetFrame = PR_TRUE;
          }

          OnOptionSelected(selectFrame, optIndex, PR_FALSE, PR_TRUE, aNotify);
          optionsDeselected = PR_TRUE;
        }
      }
    }
  }

  // Make sure something is selected unless we were set to -1 (none)
  if (optionsDeselected && aStartIndex != -1) {
    optionsSelected = CheckSelectSomething() || optionsSelected;
  }

  // Let the caller know whether anything was changed
  if (optionsSelected || optionsDeselected) {
    if (aChangedSomething)
      *aChangedSomething = PR_TRUE;
  }

  return NS_OK;
}

NS_IMETHODIMP
nsHTMLSelectElement::IsOptionDisabled(PRInt32 aIndex, PRBool* aIsDisabled)
{
  *aIsDisabled = PR_FALSE;
  nsCOMPtr<nsIDOMNode> optionNode;
  Item(aIndex, getter_AddRefs(optionNode));
  NS_ENSURE_TRUE(optionNode, NS_ERROR_FAILURE);

  nsCOMPtr<nsIDOMHTMLOptionElement> option = do_QueryInterface(optionNode);
  if (option) {
    PRBool isDisabled;
    option->GetDisabled(&isDisabled);
    if (isDisabled) {
      *aIsDisabled = PR_TRUE;
      return NS_OK;
    }
  }

  // Check for disabled optgroups
  // If there are no artifacts, there are no optgroups
  if (mNonOptionChildren) {
    nsCOMPtr<nsIDOMNode> parent;
    while (1) {
      optionNode->GetParentNode(getter_AddRefs(parent));

      // If we reached the top of the doc (scary), we're done
      if (!parent) {
        break;
      }

      // If we reached the select element, we're done
      nsCOMPtr<nsIDOMHTMLSelectElement> selectElement =
        do_QueryInterface(parent);
      if (selectElement) {
        break;
      }

      nsCOMPtr<nsIDOMHTMLOptGroupElement> optGroupElement =
        do_QueryInterface(parent);

      if (optGroupElement) {
        PRBool isDisabled;
        optGroupElement->GetDisabled(&isDisabled);

        if (isDisabled) {
          *aIsDisabled = PR_TRUE;
          return NS_OK;
        }
      } else {
        // If you put something else between you and the optgroup, you're a
        // moron and you deserve not to have optgroup disabling work.
        break;
      }

      optionNode = parent;
    }
  }

  return NS_OK;
}

NS_IMETHODIMP
nsHTMLSelectElement::GetValue(nsAString& aValue)
{
  PRInt32 selectedIndex;

  nsresult rv = GetSelectedIndex(&selectedIndex);

  if (NS_SUCCEEDED(rv) && selectedIndex > -1) {
    nsCOMPtr<nsIDOMNode> node;

    rv = Item(selectedIndex, getter_AddRefs(node));

    nsCOMPtr<nsIDOMHTMLOptionElement> option = do_QueryInterface(node);
    if (NS_SUCCEEDED(rv) && option) {
      return option->GetValue(aValue);
    }
  }

  aValue.Truncate(0);
  return rv;
}

NS_IMETHODIMP
nsHTMLSelectElement::SetValue(const nsAString& aValue)
{
  nsresult rv = NS_OK;

  PRUint32 length;
  rv = GetLength(&length);
  if (NS_SUCCEEDED(rv)) {
    PRUint32 i;
    for (i = 0; i < length; i++) {
      nsCOMPtr<nsIDOMNode> node;

      rv = Item(i, getter_AddRefs(node));

      if (NS_SUCCEEDED(rv) && node) {
        nsCOMPtr<nsIDOMHTMLOptionElement> option = do_QueryInterface(node);

        if (option) {
          nsAutoString optionVal;

          option->GetValue(optionVal);

          if (optionVal.Equals(aValue)) {
            SetSelectedIndex((PRInt32)i);

            break;
          }
        }
      }
    }
  }

  return rv;
}


NS_IMPL_BOOL_ATTR(nsHTMLSelectElement, Disabled, disabled)
NS_IMPL_BOOL_ATTR(nsHTMLSelectElement, Multiple, multiple)
NS_IMPL_STRING_ATTR(nsHTMLSelectElement, Name, name)
NS_IMPL_INT_ATTR_DEFAULT_VALUE(nsHTMLSelectElement, Size, size, 0)
NS_IMPL_INT_ATTR_DEFAULT_VALUE(nsHTMLSelectElement, TabIndex, tabindex, 0)

NS_IMETHODIMP
nsHTMLSelectElement::Blur()
{
  return nsGenericHTMLElement::Blur();
}

NS_IMETHODIMP
nsHTMLSelectElement::Focus()
{
  return nsGenericHTMLElement::Focus();
}

PRBool
nsHTMLSelectElement::IsHTMLFocusable(PRBool *aIsFocusable, PRInt32 *aTabIndex)
{
  if (nsGenericHTMLElement::IsHTMLFocusable(aIsFocusable, aTabIndex)) {
    return PR_TRUE;
  }
  if (aTabIndex && (sTabFocusModel & eTabFocus_formElementsMask) == 0) {
    *aTabIndex = -1;
  }
  *aIsFocusable = !HasAttr(kNameSpaceID_None, nsGkAtoms::disabled);
  return PR_FALSE;
}

NS_IMETHODIMP
nsHTMLSelectElement::Item(PRUint32 aIndex, nsIDOMNode** aReturn)
{
  return mOptions->Item(aIndex, aReturn);
}

NS_IMETHODIMP
nsHTMLSelectElement::NamedItem(const nsAString& aName,
                               nsIDOMNode** aReturn)
{
  return mOptions->NamedItem(aName, aReturn);
}

PRBool
nsHTMLSelectElement::CheckSelectSomething()
{
  if (mIsDoneAddingChildren) {
    if (mSelectedIndex < 0 && IsCombobox()) {
      return SelectSomething();
    }
  }
  return PR_FALSE;
}

PRBool
nsHTMLSelectElement::SelectSomething()
{
  // If we're not done building the select, don't play with this yet.
  if (!mIsDoneAddingChildren) {
    return PR_FALSE;
  }

  PRUint32 count;
  GetLength(&count);
  for (PRUint32 i=0; i<count; i++) {
    PRBool disabled;
    nsresult rv = IsOptionDisabled(i, &disabled);

    if (NS_FAILED(rv) || !disabled) {
      rv = SetSelectedIndex(i);
      NS_ENSURE_SUCCESS(rv, PR_FALSE);
      return PR_TRUE;
    }
  }

  return PR_FALSE;
}

nsresult
nsHTMLSelectElement::BeforeSetAttr(PRInt32 aNameSpaceID, nsIAtom* aName,
                                   const nsAString* aValue, PRBool aNotify)
{
  if (aNotify && aName == nsGkAtoms::disabled &&
      aNameSpaceID == kNameSpaceID_None) {
    mDisabledChanged = PR_TRUE;
  }

  return nsGenericHTMLFormElement::BeforeSetAttr(aNameSpaceID, aName,
                                                 aValue, aNotify);
}

nsresult
nsHTMLSelectElement::UnsetAttr(PRInt32 aNameSpaceID, nsIAtom* aAttribute,
                               PRBool aNotify)
{
  if (aNotify && aNameSpaceID == kNameSpaceID_None &&
      aAttribute == nsGkAtoms::multiple) {
    // We're changing from being a multi-select to a single-select.
    // Make sure we only have one option selected before we do that.
    // Note that this needs to come before we really unset the attr,
    // since SetOptionsSelectedByIndex does some bail-out type
    // optimization for cases when the select is not multiple that
    // would lead to only a single option getting deselected.
    if (mSelectedIndex >= 0) {
      SetSelectedIndex(mSelectedIndex);
    }
  }

  nsresult rv = nsGenericHTMLFormElement::UnsetAttr(aNameSpaceID, aAttribute,
                                                    aNotify);
  NS_ENSURE_SUCCESS(rv, rv);

  if (aNotify && aNameSpaceID == kNameSpaceID_None &&
      aAttribute == nsGkAtoms::multiple) {
    // We might have become a combobox; make sure _something_ gets
    // selected in that case
    CheckSelectSomething();
  }

  return rv;
}

PRBool
nsHTMLSelectElement::IsDoneAddingChildren()
{
  return mIsDoneAddingChildren;
}

nsresult
nsHTMLSelectElement::DoneAddingChildren(PRBool aHaveNotified)
{
  mIsDoneAddingChildren = PR_TRUE;

  nsISelectControlFrame* selectFrame = GetSelectFrame();

  // If we foolishly tried to restore before we were done adding
  // content, restore the rest of the options proper-like
  if (mRestoreState) {
    RestoreStateTo(mRestoreState);
    mRestoreState = nsnull;
  }

  // Notify the frame
  if (selectFrame) {
    selectFrame->DoneAddingChildren(PR_TRUE);
  }

  // Restore state
  RestoreFormControlState(this, this);

  // Now that we're done, select something (if it's a single select something
  // must be selected)
  CheckSelectSomething();

  return NS_OK;
}

PRBool
nsHTMLSelectElement::ParseAttribute(PRInt32 aNamespaceID,
                                    nsIAtom* aAttribute,
                                    const nsAString& aValue,
                                    nsAttrValue& aResult)
{
  if (aAttribute == nsGkAtoms::size && kNameSpaceID_None == aNamespaceID) {
    return aResult.ParseIntWithBounds(aValue, 0);
  }
  return nsGenericHTMLElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
                                              aResult);
}

static void
MapAttributesIntoRule(const nsMappedAttributes* aAttributes,
                      nsRuleData* aData)
{
  nsGenericHTMLFormElement::MapImageAlignAttributeInto(aAttributes, aData);
  nsGenericHTMLFormElement::MapCommonAttributesInto(aAttributes, aData);
}

nsChangeHint
nsHTMLSelectElement::GetAttributeChangeHint(const nsIAtom* aAttribute,
                                            PRInt32 aModType) const
{
  nsChangeHint retval =
      nsGenericHTMLFormElement::GetAttributeChangeHint(aAttribute, aModType);
  if (aAttribute == nsGkAtoms::multiple ||
      aAttribute == nsGkAtoms::size) {
    NS_UpdateHint(retval, NS_STYLE_HINT_FRAMECHANGE);
  }
  return retval;
}

NS_IMETHODIMP_(PRBool)
nsHTMLSelectElement::IsAttributeMapped(const nsIAtom* aAttribute) const
{
  static const MappedAttributeEntry* const map[] = {
    sCommonAttributeMap,
    sImageAlignAttributeMap
  };

  return FindAttributeDependence(aAttribute, map, NS_ARRAY_LENGTH(map));
}

nsMapRuleToAttributesFunc
nsHTMLSelectElement::GetAttributeMappingFunction() const
{
  return &MapAttributesIntoRule;
}


nsresult
nsHTMLSelectElement::PreHandleEvent(nsEventChainPreVisitor& aVisitor)
{
  aVisitor.mCanHandle = PR_FALSE;
  // Do not process any DOM events if the element is disabled
  // XXXsmaug This is not the right thing to do. But what is?
  PRBool disabled;
  nsresult rv = GetDisabled(&disabled);
  if (NS_FAILED(rv) || disabled) {
    return rv;
  }

  nsIFormControlFrame* formControlFrame = GetFormControlFrame(PR_FALSE);
  nsIFrame* formFrame = nsnull;

  if (formControlFrame &&
      (formFrame = do_QueryFrame(formControlFrame))) {
    const nsStyleUserInterface* uiStyle = formFrame->GetStyleUserInterface();

    if (uiStyle->mUserInput == NS_STYLE_USER_INPUT_NONE ||
        uiStyle->mUserInput == NS_STYLE_USER_INPUT_DISABLED) {
      return NS_OK;
    }
  }

  return nsGenericHTMLFormElement::PreHandleEvent(aVisitor);
}

// nsIFormControl

NS_IMETHODIMP
nsHTMLSelectElement::SaveState()
{
  nsRefPtr<nsSelectState> state = new nsSelectState();
  if (!state) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  PRUint32 len;
  GetLength(&len);

  for (PRUint32 optIndex = 0; optIndex < len; optIndex++) {
    nsIDOMHTMLOptionElement *option = mOptions->ItemAsOption(optIndex);
    if (option) {
      PRBool isSelected;
      option->GetSelected(&isSelected);
      if (isSelected) {
        nsAutoString value;
        option->GetValue(value);
        state->PutOption(optIndex, value);
      }
    }
  }

  nsPresState *presState = nsnull;
  nsresult rv = GetPrimaryPresState(this, &presState);
  if (presState) {
    presState->SetStateProperty(state);

    if (mDisabledChanged) {
      PRBool disabled;
      GetDisabled(&disabled);
      presState->SetDisabled(disabled);
    }
  }

  return rv;
}

PRBool
nsHTMLSelectElement::RestoreState(nsPresState* aState)
{
  // Get the presentation state object to retrieve our stuff out of.
  nsCOMPtr<nsSelectState> state(
    do_QueryInterface(aState->GetStateProperty()));

  if (state) {
    RestoreStateTo(state);

    // Don't flush, if the frame doesn't exist yet it doesn't care if
    // we're reset or not.
    DispatchContentReset();
  }

  if (aState->IsDisabledSet()) {
    SetDisabled(aState->GetDisabled());
  }

  return PR_FALSE;
}

void
nsHTMLSelectElement::RestoreStateTo(nsSelectState* aNewSelected)
{
  if (!mIsDoneAddingChildren) {
    mRestoreState = aNewSelected;
    return;
  }

  PRUint32 len;
  GetLength(&len);

  // First clear all
  SetOptionsSelectedByIndex(-1, -1, PR_TRUE, PR_TRUE, PR_TRUE, PR_TRUE, nsnull);

  // Next set the proper ones
  for (PRInt32 i = 0; i < (PRInt32)len; i++) {
    nsIDOMHTMLOptionElement *option = mOptions->ItemAsOption(i);
    if (option) {
      nsAutoString value;
      nsresult rv = option->GetValue(value);
      if (NS_SUCCEEDED(rv) && aNewSelected->ContainsOption(i, value)) {
        SetOptionsSelectedByIndex(i, i, PR_TRUE, PR_FALSE, PR_TRUE, PR_TRUE, nsnull);
      }
    }
  }

  //CheckSelectSomething();
}

NS_IMETHODIMP
nsHTMLSelectElement::Reset()
{
  PRUint32 numSelected = 0;

  //
  // Cycle through the options array and reset the options
  //
  PRUint32 numOptions;
  nsresult rv = GetLength(&numOptions);
  NS_ENSURE_SUCCESS(rv, rv);

  for (PRUint32 i = 0; i < numOptions; i++) {
    nsCOMPtr<nsIDOMNode> node;
    rv = Item(i, getter_AddRefs(node));
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsIDOMHTMLOptionElement> option(do_QueryInterface(node));

    NS_ASSERTION(option, "option not an OptionElement");
    if (option) {
      //
      // Reset the option to its default value
      //
      PRBool selected = PR_FALSE;
      option->GetDefaultSelected(&selected);
      SetOptionsSelectedByIndex(i, i, selected,
                                PR_FALSE, PR_TRUE, PR_TRUE, nsnull);
      if (selected) {
        numSelected++;
      }
    }
  }

  //
  // If nothing was selected and it's not multiple, select something
  //
  if (numSelected == 0 && IsCombobox()) {
    SelectSomething();
  }

  //
  // Let the frame know we were reset
  //
  // Don't flush, if there's no frame yet it won't care about us being
  // reset even if we forced it to be created now.
  //
  DispatchContentReset();

  return NS_OK;
}

NS_IMETHODIMP
nsHTMLSelectElement::SubmitNamesValues(nsIFormSubmission* aFormSubmission,
                                       nsIContent* aSubmitElement)
{
  nsresult rv = NS_OK;

  //
  // Disabled elements don't submit
  //
  PRBool disabled;
  rv = GetDisabled(&disabled);
  if (NS_FAILED(rv) || disabled) {
    return rv;
  }

  //
  // Get the name (if no name, no submit)
  //
  nsAutoString name;
  GetAttr(kNameSpaceID_None, nsGkAtoms::name, name);
  if (name.IsEmpty()) {
    return NS_OK;
  }

  //
  // Submit
  //
  PRUint32 len;
  GetLength(&len);

  for (PRUint32 optIndex = 0; optIndex < len; optIndex++) {
    // Don't send disabled options
    PRBool disabled;
    rv = IsOptionDisabled(optIndex, &disabled);
    if (NS_FAILED(rv) || disabled) {
      continue;
    }

    nsIDOMHTMLOptionElement *option = mOptions->ItemAsOption(optIndex);
    NS_ENSURE_TRUE(option, NS_ERROR_UNEXPECTED);

    PRBool isSelected;
    rv = option->GetSelected(&isSelected);
    NS_ENSURE_SUCCESS(rv, rv);
    if (!isSelected) {
      continue;
    }

    nsCOMPtr<nsIDOMHTMLOptionElement> optionElement = do_QueryInterface(option);
    NS_ENSURE_TRUE(optionElement, NS_ERROR_UNEXPECTED);

    nsAutoString value;
    rv = optionElement->GetValue(value);
    NS_ENSURE_SUCCESS(rv, rv);

    rv = aFormSubmission->AddNameValuePair(this, name, value);
  }

  return NS_OK;
}

NS_IMETHODIMP
nsHTMLSelectElement::GetHasOptGroups(PRBool* aHasGroups)
{
  *aHasGroups = (mOptGroupCount > 0);
  return NS_OK;
}

void nsHTMLSelectElement::DispatchContentReset() {
  nsIFormControlFrame* formControlFrame = GetFormControlFrame(PR_FALSE);
  if (formControlFrame) {
    // Only dispatch content reset notification if this is a list control
    // frame or combo box control frame.
    if (IsCombobox()) {
      nsIComboboxControlFrame* comboFrame = do_QueryFrame(formControlFrame);
      if (comboFrame) {
        comboFrame->OnContentReset();
      }
    } else {
      nsIListControlFrame* listFrame = do_QueryFrame(formControlFrame);
      if (listFrame) {
        listFrame->OnContentReset();
      }
    }
  }
}

static void
AddOptionsRecurse(nsIContent* aRoot, nsHTMLOptionCollection* aArray)
{
  nsIContent* child;
  for(PRUint32 i = 0; (child = aRoot->GetChildAt(i)); ++i) {
    nsCOMPtr<nsIDOMHTMLOptionElement> opt = do_QueryInterface(child);
    if (opt) {
      // If we fail here, then at least we've tried our best
      aArray->AppendOption(opt);
    }
    else if (IsOptGroup(child)) {
      AddOptionsRecurse(child, aArray);
    }
  }
}

void
nsHTMLSelectElement::RebuildOptionsArray()
{
  mOptions->Clear();
  AddOptionsRecurse(this, mOptions);
  FindSelectedIndex(0);
}

#ifdef DEBUG

static void
VerifyOptionsRecurse(nsIContent* aRoot, PRInt32& aIndex,
                     nsHTMLOptionCollection* aArray)
{
  nsIContent* child;
  for(PRUint32 i = 0; (child = aRoot->GetChildAt(i)); ++i) {
    nsCOMPtr<nsIDOMHTMLOptionElement> opt = do_QueryInterface(child);
    if (opt) {
      NS_ASSERTION(opt == aArray->ItemAsOption(aIndex++),
                   "Options collection broken");
    }
    else if (IsOptGroup(child)) {
      VerifyOptionsRecurse(child, aIndex, aArray);
    }
  }
}

void
nsHTMLSelectElement::VerifyOptionsArray()
{
  PRInt32 aIndex = 0;
  VerifyOptionsRecurse(this, aIndex, mOptions);
}


#endif

//----------------------------------------------------------------------
//
// nsHTMLOptionCollection implementation
//

nsHTMLOptionCollection::nsHTMLOptionCollection(nsHTMLSelectElement* aSelect)
{
  // Do not maintain a reference counted reference. When
  // the select goes away, it will let us know.
  mSelect = aSelect;
}

nsHTMLOptionCollection::~nsHTMLOptionCollection()
{
  DropReference();
}

void
nsHTMLOptionCollection::DropReference()
{
  // Drop our (non ref-counted) reference
  mSelect = nsnull;
}

nsresult
nsHTMLOptionCollection::GetOptionIndex(nsIDOMHTMLOptionElement* aOption,
                                       PRInt32 aStartIndex,
                                       PRBool aForward,
                                       PRInt32* aIndex)
{
  PRInt32 index;

  // Make the common case fast
  if (aStartIndex == 0 && aForward) {
    index = mElements.IndexOf(aOption);
    if (index == -1) {
      return NS_ERROR_FAILURE;
    }
    
    *aIndex = index;
    return NS_OK;
  }

  PRInt32 high = mElements.Count();
  PRInt32 step = aForward ? 1 : -1;

  for (index = aStartIndex; index < high && index > -1; index += step) {
    if (mElements[index] == aOption) {
      *aIndex = index;
      return NS_OK;
    }
  }

  return NS_ERROR_FAILURE;
}


NS_IMPL_CYCLE_COLLECTION_CLASS(nsHTMLOptionCollection)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsHTMLOptionCollection)
  NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMARRAY(mElements)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsHTMLOptionCollection)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMARRAY(mElements)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

// nsISupports

// QueryInterface implementation for nsHTMLOptionCollection
NS_INTERFACE_TABLE_HEAD(nsHTMLOptionCollection)
  NS_INTERFACE_TABLE4(nsHTMLOptionCollection,
                      nsIHTMLCollection,
                      nsIDOMNSHTMLOptionCollection,
                      nsIDOMHTMLOptionsCollection,
                      nsIDOMHTMLCollection)
  NS_INTERFACE_TABLE_TO_MAP_SEGUE_CYCLE_COLLECTION(nsHTMLOptionCollection)
  NS_INTERFACE_MAP_ENTRY_CONTENT_CLASSINFO(HTMLOptionsCollection)
NS_INTERFACE_MAP_END


NS_IMPL_CYCLE_COLLECTING_ADDREF_AMBIGUOUS(nsHTMLOptionCollection,
                                          nsIHTMLCollection)
NS_IMPL_CYCLE_COLLECTING_RELEASE_AMBIGUOUS(nsHTMLOptionCollection,
                                           nsIHTMLCollection)


// nsIDOMNSHTMLOptionCollection interface

NS_IMETHODIMP
nsHTMLOptionCollection::GetLength(PRUint32* aLength)
{
  *aLength = mElements.Count();

  return NS_OK;
}

NS_IMETHODIMP
nsHTMLOptionCollection::SetLength(PRUint32 aLength)
{
  if (!mSelect) {
    return NS_ERROR_UNEXPECTED;
  }

  return mSelect->SetLength(aLength);
}

NS_IMETHODIMP
nsHTMLOptionCollection::SetOption(PRInt32 aIndex,
                                  nsIDOMHTMLOptionElement *aOption)
{
  if (aIndex < 0 || !mSelect) {
    return NS_OK;
  }
  
  // if the new option is null, just remove this option.  Note that it's safe
  // to pass a too-large aIndex in here.
  if (!aOption) {
    mSelect->Remove(aIndex);

    // We're done.
    return NS_OK;
  }

  nsresult rv = NS_OK;

  // Now we're going to be setting an option in our collection
  if (aIndex > mElements.Count()) {
    // Fill our array with blank options up to (but not including, since we're
    // about to change it) aIndex, for compat with other browsers.
    rv = SetLength(aIndex);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  NS_ASSERTION(aIndex <= mElements.Count(), "SetLength lied");
  
  nsCOMPtr<nsIDOMNode> ret;
  if (aIndex == mElements.Count()) {
    rv = mSelect->AppendChild(aOption, getter_AddRefs(ret));
  } else {
    // Find the option they're talking about and replace it
    // hold a strong reference to follow COM rules.
    nsCOMPtr<nsIDOMHTMLOptionElement> refChild = mElements.SafeObjectAt(aIndex);
    NS_ENSURE_TRUE(refChild, NS_ERROR_UNEXPECTED);

    nsCOMPtr<nsIDOMNode> parent;
    refChild->GetParentNode(getter_AddRefs(parent));
    if (parent) {
      rv = parent->ReplaceChild(aOption, refChild, getter_AddRefs(ret));
    }
  }

  return rv;
}

NS_IMETHODIMP
nsHTMLOptionCollection::GetSelectedIndex(PRInt32 *aSelectedIndex)
{
  NS_ENSURE_TRUE(mSelect, NS_ERROR_UNEXPECTED);

  return mSelect->GetSelectedIndex(aSelectedIndex);
}

NS_IMETHODIMP
nsHTMLOptionCollection::SetSelectedIndex(PRInt32 aSelectedIndex)
{
  NS_ENSURE_TRUE(mSelect, NS_ERROR_UNEXPECTED);

  return mSelect->SetSelectedIndex(aSelectedIndex);
}

NS_IMETHODIMP
nsHTMLOptionCollection::Item(PRUint32 aIndex, nsIDOMNode** aReturn)
{
  nsresult rv;
  nsISupports* item = GetNodeAt(aIndex, &rv);
  if (!item) {
    *aReturn = nsnull;

    return rv;
  }

  return CallQueryInterface(item, aReturn);
}

nsISupports*
nsHTMLOptionCollection::GetNamedItem(const nsAString& aName, nsresult* aResult)
{
  *aResult = NS_OK;

  PRInt32 count = mElements.Count();
  for (PRInt32 i = 0; i < count; i++) {
    nsCOMPtr<nsIContent> content = do_QueryInterface(mElements.ObjectAt(i));
    if (content &&
        (content->AttrValueIs(kNameSpaceID_None, nsGkAtoms::name, aName,
                              eCaseMatters) ||
         content->AttrValueIs(kNameSpaceID_None, nsGkAtoms::id, aName,
                              eCaseMatters))) {
      return content;
    }
  }

  return nsnull;
}

NS_IMETHODIMP
nsHTMLOptionCollection::NamedItem(const nsAString& aName,
                                  nsIDOMNode** aReturn)
{
  nsresult rv;
  nsISupports* item = GetNamedItem(aName, &rv);
  if (!item) {
    *aReturn = nsnull;

    return rv;
  }

  return CallQueryInterface(item, aReturn);
}

NS_IMETHODIMP
nsHTMLOptionCollection::GetSelect(nsIDOMHTMLSelectElement **aReturn)
{
  NS_IF_ADDREF(*aReturn = mSelect);
  return NS_OK;
}

NS_IMETHODIMP
nsHTMLOptionCollection::Add(nsIDOMHTMLOptionElement *aOption,
                            PRInt32 aIndex, PRUint8 optional_argc)
{
  if (!aOption) {
    return NS_ERROR_INVALID_ARG;
  }

  if (aIndex < -1) {
    return NS_ERROR_DOM_INDEX_SIZE_ERR;
  }

  if (!mSelect) {
    return NS_ERROR_NOT_INITIALIZED;
  }

  PRUint32 length;
  GetLength(&length);

  if (optional_argc == 0 || aIndex == -1 || aIndex > (PRInt32)length) {
    // IE appends in these cases
    aIndex = length;
  }

  nsCOMPtr<nsIDOMNode> beforeNode;
  Item(aIndex, getter_AddRefs(beforeNode));

  nsCOMPtr<nsIDOMHTMLOptionElement> beforeElement =
    do_QueryInterface(beforeNode);

  return mSelect->Add(aOption, beforeElement);
}

NS_IMETHODIMP
nsHTMLOptionCollection::Remove(PRInt32 aIndex)
{
  NS_ENSURE_TRUE(mSelect, NS_ERROR_UNEXPECTED);

  PRUint32 len = 0;
  mSelect->GetLength(&len);
  if (aIndex < 0 || aIndex >= len)
    aIndex = 0;

  return mSelect->Remove(aIndex);
}