/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
 *           (C) 2001 Dirk Mueller (mueller@kde.org)
 * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
 *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#include "config.h"
#include "HTMLOptGroupElement.h"

#include "Document.h"
#include "HTMLNames.h"
#include "HTMLSelectElement.h"
#include "RenderMenuList.h"
#include "NodeRenderStyle.h"
#include "StyleResolver.h"
#include <wtf/StdLibExtras.h>

namespace WebCore {

using namespace HTMLNames;

inline HTMLOptGroupElement::HTMLOptGroupElement(const QualifiedName& tagName, Document& document)
    : HTMLElement(tagName, document)
{
    ASSERT(hasTagName(optgroupTag));
    setHasCustomStyleResolveCallbacks();
}

PassRefPtr<HTMLOptGroupElement> HTMLOptGroupElement::create(const QualifiedName& tagName, Document& document)
{
    return adoptRef(new HTMLOptGroupElement(tagName, document));
}

bool HTMLOptGroupElement::isDisabledFormControl() const
{
    return fastHasAttribute(disabledAttr);
}

bool HTMLOptGroupElement::isFocusable() const
{
    // Optgroup elements do not have a renderer so we check the renderStyle instead.
    return supportsFocus() && renderStyle() && renderStyle()->display() != NONE;
}

const AtomicString& HTMLOptGroupElement::formControlType() const
{
    DEFINE_STATIC_LOCAL(const AtomicString, optgroup, ("optgroup", AtomicString::ConstructFromLiteral));
    return optgroup;
}

void HTMLOptGroupElement::childrenChanged(const ChildChange& change)
{
    recalcSelectOptions();
    HTMLElement::childrenChanged(change);
}

void HTMLOptGroupElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
{
    HTMLElement::parseAttribute(name, value);
    recalcSelectOptions();

    if (name == disabledAttr)
        didAffectSelector(AffectedSelectorDisabled | AffectedSelectorEnabled);
}

void HTMLOptGroupElement::recalcSelectOptions()
{
    ContainerNode* select = parentNode();
    while (select && !select->hasTagName(selectTag))
        select = select->parentNode();
    if (select)
        toHTMLSelectElement(select)->setRecalcListItems();
}

void HTMLOptGroupElement::didAttachRenderers()
{
    // If after attaching nothing called styleForRenderer() on this node we
    // manually cache the value. This happens if our parent doesn't have a
    // renderer like <optgroup> or if it doesn't allow children like <select>.
    if (!m_style && parentNode()->renderStyle())
        updateNonRenderStyle();
}

void HTMLOptGroupElement::willDetachRenderers()
{
    m_style.clear();
}

void HTMLOptGroupElement::updateNonRenderStyle()
{
    m_style = document().ensureStyleResolver().styleForElement(this);
}

RenderStyle* HTMLOptGroupElement::nonRendererStyle() const
{
    return m_style.get();
}

PassRefPtr<RenderStyle> HTMLOptGroupElement::customStyleForRenderer()
{
    // styleForRenderer is called whenever a new style should be associated
    // with an Element so now is a good time to update our cached style.
    updateNonRenderStyle();
    return m_style;
}

String HTMLOptGroupElement::groupLabelText() const
{
    String itemText = document().displayStringModifiedByEncoding(getAttribute(labelAttr));
    
    // In WinIE, leading and trailing whitespace is ignored in options and optgroups. We match this behavior.
    itemText = itemText.stripWhiteSpace();
    // We want to collapse our whitespace too.  This will match other browsers.
    itemText = itemText.simplifyWhiteSpace();
        
    return itemText;
}
    
HTMLSelectElement* HTMLOptGroupElement::ownerSelectElement() const
{
    ContainerNode* select = parentNode();
    while (select && !select->hasTagName(selectTag))
        select = select->parentNode();
    
    if (!select)
       return 0;
    
    return toHTMLSelectElement(select);
}

void HTMLOptGroupElement::accessKeyAction(bool)
{
    HTMLSelectElement* select = ownerSelectElement();
    // send to the parent to bring focus to the list box
    if (select && !select->focused())
        select->accessKeyAction(false);
}

} // namespace
