/*

 * Copyright (C) 2010 Apple Inc. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

 */

#include "config.h"

#include "RenderIFrame.h"

#include "FrameView.h"

#include "HTMLNames.h"

#include "HTMLIFrameElement.h"

#include "RenderView.h"

#include "Settings.h"

namespace WebCore {

using namespace HTMLNames;

RenderIFrame::RenderIFrame(Element* element)

    : RenderFrameBase(element)

{

}

void RenderIFrame::calcHeight()

{

    RenderPart::calcHeight();

    if (!flattenFrame())

         return;

    HTMLIFrameElement* frame = static_cast<HTMLIFrameElement*>(node());

    bool isScrollable = frame->scrollingMode() != ScrollbarAlwaysOff;

    if (isScrollable || !style()->height().isFixed()) {

        FrameView* view = static_cast<FrameView*>(widget());

        if (!view)

            return;

        int border = borderTop() + borderBottom();

        setHeight(max(height(), view->contentsHeight() + border));

    }

}

void RenderIFrame::calcWidth()

{

    RenderPart::calcWidth();

    if (!flattenFrame())

        return;

    HTMLIFrameElement* frame = static_cast<HTMLIFrameElement*>(node());

    bool isScrollable = frame->scrollingMode() != ScrollbarAlwaysOff;

    if (isScrollable || !style()->width().isFixed()) {

        FrameView* view = static_cast<FrameView*>(widget());

        if (!view)

            return;

        int border = borderLeft() + borderRight();

        setWidth(max(width(), view->contentsWidth() + border));

    }

}

bool RenderIFrame::flattenFrame()

{

    if (!node() || !node()->hasTagName(iframeTag))

        return false;

    HTMLIFrameElement* element = static_cast<HTMLIFrameElement*>(node());

    bool isScrollable = element->scrollingMode() != ScrollbarAlwaysOff;

    if (!isScrollable && style()->width().isFixed()

        && style()->height().isFixed())

        return false;

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

    bool enabled = frame && frame->settings()->frameFlatteningEnabled();

    if (!enabled || !frame->page())

        return false;

    FrameView* view = frame->page()->mainFrame()->view();

    if (!view)

        return false;

    // Do not flatten offscreen inner frames during frame flattening.

    return absoluteBoundingBoxRect().intersects(IntRect(IntPoint(0, 0), view->contentsSize()));

}

void RenderIFrame::layout()

{

    ASSERT(needsLayout());

    RenderPart::calcWidth();

    RenderPart::calcHeight();

    if (flattenFrame()) {

        layoutWithFlattening(style()->width().isFixed(), style()->height().isFixed());

        return;

    }

    RenderPart::layout();

    m_overflow.clear();

    addShadowOverflow();

    setNeedsLayout(false);

}

#if USE(ACCELERATED_COMPOSITING)

bool RenderIFrame::requiresLayer() const

{

    if (RenderPart::requiresLayer())

        return true;

    return requiresAcceleratedCompositing();

}

bool RenderIFrame::requiresAcceleratedCompositing() const

{

    if (!node() || !node()->hasTagName(iframeTag))

        return false;

    // If the contents of the iframe are composited, then we have to be as well.

    HTMLIFrameElement* element = static_cast<HTMLIFrameElement*>(node());

    if (Document* contentDocument = element->contentDocument()) {

        if (RenderView* view = contentDocument->renderView())

            return view->usesCompositing();

    }

    return false;

}

#endif

}