/**

 * This file is part of the DOM implementation for KDE.

 *

 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)

 *           (C) 1999 Antti Koivisto (koivisto@kde.org)

 *           (C) 2000 Simon Hausmann (hausmann@kde.org)

 *           (C) 2001 Dirk Mueller (mueller@kde.org)

 * Copyright (C) 2004, 2006 Apple Computer, Inc.

 *

 * 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 "HTMLFrameElementBase.h"

#include "Document.h"

#include "EventNames.h"

#include "FocusController.h"

#include "Frame.h"

#include "FrameLoader.h"

#include "FrameTree.h"

#include "FrameView.h"

#include "HTMLFrameSetElement.h"

#include "HTMLNames.h"

#include "KURL.h"

#include "Page.h"

#include "RenderFrame.h"

#include "Settings.h"

namespace WebCore {

using namespace EventNames;

using namespace HTMLNames;

HTMLFrameElementBase::HTMLFrameElementBase(const QualifiedName& tagName, Document *doc)

    : HTMLFrameOwnerElement(tagName, doc)

    , m_scrolling(ScrollbarAuto)

    , m_marginWidth(-1)

    , m_marginHeight(-1)

    , m_noResize(false)

    , m_viewSource(false)

    , m_shouldOpenURLAfterAttach(false)

{

}

bool HTMLFrameElementBase::isURLAllowed(const AtomicString& URLString) const

{

    if (URLString.isEmpty())

        return true;

    KURL completeURL(document()->completeURL(URLString.deprecatedString()));

    completeURL.setRef(DeprecatedString::null);

    // Don't allow more than 200 total frames in a set. This seems

    // like a reasonable upper bound, and otherwise mutually recursive

    // frameset pages can quickly bring the program to its knees with

    // exponential growth in the number of frames.

    // FIXME: This limit could be higher, but WebKit has some

    // algorithms that happen while loading which appear to be N^2 or

    // worse in the number of frames

    if (Frame* parentFrame = document()->frame())

        if (parentFrame->page()->frameCount() > 200)

            return false;

    // We allow one level of self-reference because some sites depend on that.

    // But we don't allow more than one.

    bool foundSelfReference = false;

    for (Frame* frame = document()->frame(); frame; frame = frame->tree()->parent()) {

        KURL frameURL = frame->loader()->url();

        frameURL.setRef(DeprecatedString::null);

        if (frameURL == completeURL) {

            if (foundSelfReference)

                return false;

            foundSelfReference = true;

        }

    }

    return true;

}

void HTMLFrameElementBase::openURL()

{

    ASSERT(!m_name.isEmpty());

    if (!isURLAllowed(m_URL))

        return;

    if (m_URL.isEmpty())

        m_URL = "about:blank";

    Frame* parentFrame = document()->frame();

    if (!parentFrame)

        return;

    parentFrame->loader()->requestFrame(this, m_URL, m_name);

    if (contentFrame())

        contentFrame()->setInViewSourceMode(viewSourceMode());

}

void HTMLFrameElementBase::parseMappedAttribute(MappedAttribute *attr)

{

    if (attr->name() == srcAttr)

        setLocation(parseURL(attr->value()));

    else if (attr->name() == idAttr) {

        // Important to call through to base for the id attribute so the hasID bit gets set.

        HTMLFrameOwnerElement::parseMappedAttribute(attr);

        m_name = attr->value();

    } else if (attr->name() == nameAttr) {

        m_name = attr->value();

        // FIXME: If we are already attached, this doesn't actually change the frame's name.

        // FIXME: If we are already attached, this doesn't check for frame name

        // conflicts and generate a unique frame name.

    } else if (attr->name() == marginwidthAttr) {

        m_marginWidth = attr->value().toInt();

        // FIXME: If we are already attached, this has no effect.

    } else if (attr->name() == marginheightAttr) {

        m_marginHeight = attr->value().toInt();

        // FIXME: If we are already attached, this has no effect.

    } else if (attr->name() == noresizeAttr) {

        m_noResize = true;

        // FIXME: If we are already attached, this has no effect.

    } else if (attr->name() == scrollingAttr) {

        // Auto and yes both simply mean "allow scrolling." No means "don't allow scrolling."

        if (equalIgnoringCase(attr->value(), "auto") || equalIgnoringCase(attr->value(), "yes"))

            m_scrolling = ScrollbarAuto;

        else if (equalIgnoringCase(attr->value(), "no"))

            m_scrolling = ScrollbarAlwaysOff;

        // FIXME: If we are already attached, this has no effect.

    } else if (attr->name() == viewsourceAttr) {

        m_viewSource = !attr->isNull();

        if (contentFrame())

            contentFrame()->setInViewSourceMode(viewSourceMode());

    } else if (attr->name() == onloadAttr) {

        setHTMLEventListener(loadEvent, attr);

    } else if (attr->name() == onbeforeunloadAttr) {

        // FIXME: should <frame> elements have beforeunload handlers?

        setHTMLEventListener(beforeunloadEvent, attr);

    } else if (attr->name() == onunloadAttr) {

        setHTMLEventListener(unloadEvent, attr);

    } else

        HTMLFrameOwnerElement::parseMappedAttribute(attr);

}

void HTMLFrameElementBase::setNameAndOpenURL()

{

    m_name = getAttribute(nameAttr);

    if (m_name.isNull())

        m_name = getAttribute(idAttr);

    if (Frame* parentFrame = document()->frame())

        m_name = parentFrame->tree()->uniqueChildName(m_name);

    openURL();

}

void HTMLFrameElementBase::setNameAndOpenURLCallback(Node* n)

{

    static_cast<HTMLFrameElementBase*>(n)->setNameAndOpenURL();

}

void HTMLFrameElementBase::insertedIntoDocument()

{

    HTMLFrameOwnerElement::insertedIntoDocument();

    // We delay frame loading until after the render tree is fully constructed.

    // Othewise, a synchronous load that executed JavaScript would see incorrect 

    // (0) values for the frame's renderer-dependent properties, like width.

    m_shouldOpenURLAfterAttach = true;

}

void HTMLFrameElementBase::removedFromDocument()

{

    m_shouldOpenURLAfterAttach = false;

    HTMLFrameOwnerElement::removedFromDocument();

}

void HTMLFrameElementBase::attach()

{

    if (m_shouldOpenURLAfterAttach) {

        m_shouldOpenURLAfterAttach = false;

        queuePostAttachCallback(&HTMLFrameElementBase::setNameAndOpenURLCallback, this);

    }

    HTMLFrameOwnerElement::attach();

    if (RenderPart* renderPart = static_cast<RenderPart*>(renderer()))

        if (Frame* frame = contentFrame())

            renderPart->setWidget(frame->view());

}

void HTMLFrameElementBase::willRemove()

{

    if (Frame* frame = contentFrame()) {

        frame->disconnectOwnerElement();

        frame->loader()->frameDetached();

    }

    HTMLFrameOwnerElement::willRemove();

}

String HTMLFrameElementBase::location() const

{

    return src();

}

void HTMLFrameElementBase::setLocation(const String& str)

{

    Settings* settings = document()->settings();

    if (settings && settings->needsAcrobatFrameReloadingQuirk() && m_URL == str)

        return;

    m_URL = AtomicString(str);

    if (inDocument())

        openURL();

}

bool HTMLFrameElementBase::isFocusable() const

{

    return renderer();

}

void HTMLFrameElementBase::setFocus(bool received)

{

    HTMLFrameOwnerElement::setFocus(received);

    if (Page* page = document()->page())

        page->focusController()->setFocusedFrame(received ? contentFrame() : 0);

}

bool HTMLFrameElementBase::isURLAttribute(Attribute *attr) const

{

    return attr->name() == srcAttr;

}

String HTMLFrameElementBase::frameBorder() const

{

    return getAttribute(frameborderAttr);

}

void HTMLFrameElementBase::setFrameBorder(const String &value)

{

    setAttribute(frameborderAttr, value);

}

String HTMLFrameElementBase::longDesc() const

{

    return getAttribute(longdescAttr);

}

void HTMLFrameElementBase::setLongDesc(const String &value)

{

    setAttribute(longdescAttr, value);

}

String HTMLFrameElementBase::marginHeight() const

{

    return getAttribute(marginheightAttr);

}

void HTMLFrameElementBase::setMarginHeight(const String &value)

{

    setAttribute(marginheightAttr, value);

}

String HTMLFrameElementBase::marginWidth() const

{

    return getAttribute(marginwidthAttr);

}

void HTMLFrameElementBase::setMarginWidth(const String &value)

{

    setAttribute(marginwidthAttr, value);

}

String HTMLFrameElementBase::name() const

{

    return getAttribute(nameAttr);

}

void HTMLFrameElementBase::setName(const String &value)

{

    setAttribute(nameAttr, value);

}

void HTMLFrameElementBase::setNoResize(bool noResize)

{

    setAttribute(noresizeAttr, noResize ? "" : 0);

}

String HTMLFrameElementBase::scrolling() const

{

    return getAttribute(scrollingAttr);

}

void HTMLFrameElementBase::setScrolling(const String &value)

{

    setAttribute(scrollingAttr, value);

}

String HTMLFrameElementBase::src() const

{

    return document()->completeURL(getAttribute(srcAttr));

}

void HTMLFrameElementBase::setSrc(const String &value)

{

    setAttribute(srcAttr, value);

}

int HTMLFrameElementBase::width() const

{

    if (!renderer())

        return 0;

    document()->updateLayoutIgnorePendingStylesheets();

    return renderer()->width();

}

int HTMLFrameElementBase::height() const

{

    if (!renderer())

        return 0;

    document()->updateLayoutIgnorePendingStylesheets();

    return renderer()->height();

}

} // namespace WebCore