/*

 * 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, 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 "HTMLLabelElement.h"

#include "Document.h"

#include "Event.h"

#include "EventNames.h"

#include "HTMLFormControlElement.h"

#include "HTMLFormElement.h"

#include "HTMLNames.h"

namespace WebCore {

using namespace HTMLNames;

static HTMLFormControlElement* nodeAsLabelableFormControl(Node* node)

{

    if (!node || !node->isElementNode() || !static_cast<Element*>(node)->isFormControlElement())

        return 0;

    HTMLFormControlElement* formControlElement = static_cast<HTMLFormControlElement*>(node);

    if (!formControlElement->isLabelable())

        return 0;

    return formControlElement;

}

inline HTMLLabelElement::HTMLLabelElement(const QualifiedName& tagName, Document* document)

    : HTMLElement(tagName, document)

{

    ASSERT(hasTagName(labelTag));

}

PassRefPtr<HTMLLabelElement> HTMLLabelElement::create(const QualifiedName& tagName, Document* document)

{

    return adoptRef(new HTMLLabelElement(tagName, document));

}

bool HTMLLabelElement::isFocusable() const

{

    return false;

}

HTMLFormControlElement* HTMLLabelElement::control()

{

    const AtomicString& controlId = getAttribute(forAttr);

    if (controlId.isNull()) {

        // Search the children and descendants of the label element for a form element.

        // per http://dev.w3.org/html5/spec/Overview.html#the-label-element

        // the form element must be "labelable form-associated element".

        Node* node = this;

        while ((node = node->traverseNextNode(this))) {

            if (HTMLFormControlElement* formControlElement = nodeAsLabelableFormControl(node))

                return formControlElement;

        }

        return 0;

    }

    // Find the first element whose id is controlId. If it is found and it is a labelable form control,

    // return it, otherwise return 0.

    return nodeAsLabelableFormControl(document()->getElementById(controlId));

}

void HTMLLabelElement::setActive(bool down, bool pause)

{

    if (down == active())

        return;

    // Update our status first.

    HTMLElement::setActive(down, pause);

    // Also update our corresponding control.

    if (HTMLElement* element = control())

        element->setActive(down, pause);

}

void HTMLLabelElement::setHovered(bool over)

{

    if (over == hovered())

        return;

    // Update our status first.

    HTMLElement::setHovered(over);

    // Also update our corresponding control.

    if (HTMLElement* element = control())

        element->setHovered(over);

}

void HTMLLabelElement::defaultEventHandler(Event* evt)

{

    static bool processingClick = false;

    if (evt->type() == eventNames().clickEvent && !processingClick) {

        RefPtr<HTMLElement> element = control();

        // If we can't find a control or if the control received the click

        // event, then there's no need for us to do anything.

        if (!element || (evt->target() && element->contains(evt->target()->toNode())))

            return;

        processingClick = true;

        // Click the corresponding control.

        element->dispatchSimulatedClick(evt);

        // If the control can be focused via the mouse, then do that too.

        if (element->isMouseFocusable())

            element->focus();

        processingClick = false;

        evt->setDefaultHandled();

    }

    HTMLElement::defaultEventHandler(evt);

}

void HTMLLabelElement::focus(bool)

{

    // to match other browsers, always restore previous selection

    if (HTMLElement* element = control())

        element->focus();

}

void HTMLLabelElement::accessKeyAction(bool sendToAnyElement)

{

    if (HTMLElement* element = control())

        element->accessKeyAction(sendToAnyElement);

    else

        HTMLElement::accessKeyAction(sendToAnyElement);

}

void HTMLLabelElement::parseMappedAttribute(Attribute* attribute)

{

    if (attribute->name() == forAttr) {

        // htmlFor attribute change affects other nodes than this.

        // Clear the caches to ensure that the labels caches are cleared.

        if (document())

            document()->notifyLocalNodeListsLabelChanged();

    } else

        HTMLElement::parseMappedAttribute(attribute);

}

} // namespace