/**

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

 *

 * Copyright (C) 2000 Lars Knoll (knoll@kde.org)

 * Copyright (C) 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 "RenderBR.h"

#include "Document.h"

#include "InlineTextBox.h"

#include "VisiblePosition.h"

namespace WebCore {

RenderBR::RenderBR(Node* node)

    : RenderText(node, new StringImpl("\n"))

    , m_lineHeight(-1)

{

}

RenderBR::~RenderBR()

{

}

InlineBox* RenderBR::createInlineBox(bool makePlaceholder, bool isRootLineBox, bool isOnlyRun)

{

    // We only treat a box as text for a <br> if we are on a line by ourself or in strict mode

    // (Note the use of strict mode.  In "almost strict" mode, we don't treat the box for <br> as text.)

    InlineTextBox* box = static_cast<InlineTextBox*>(RenderText::createInlineBox(makePlaceholder, isRootLineBox, isOnlyRun));

    return box;

}

short RenderBR::baselinePosition(bool firstLine, bool isRootLineBox) const

{

    if (firstTextBox() && !firstTextBox()->isText())

        return 0;

    return RenderText::baselinePosition(firstLine, isRootLineBox);

}

short RenderBR::lineHeight(bool firstLine, bool isRootLineBox) const

{

    if (firstTextBox() && !firstTextBox()->isText())

        return 0;

    if (firstLine) {

        RenderStyle* s = style(firstLine);

        Length lh = s->lineHeight();

        if (lh.isNegative()) {

            if (s == style()) {

                if (m_lineHeight == -1)

                    m_lineHeight = RenderObject::lineHeight(false);

                return m_lineHeight;

            }

            return s->font().lineSpacing();

        }

        if (lh.isPercent())

            return lh.calcMinValue(s->fontSize());

        return lh.value();

    }

    if (m_lineHeight == -1)

        m_lineHeight = RenderObject::lineHeight(false);

    return m_lineHeight;

}

void RenderBR::setStyle(RenderStyle* newStyle)

{

    RenderText::setStyle(newStyle);

    m_lineHeight = -1;

}

int RenderBR::caretMinOffset() const 

{ 

    return 0;

}

int RenderBR::caretMaxOffset() const 

{ 

    return 1;

}

unsigned RenderBR::caretMaxRenderedOffset() const

{

    return 1;

}

VisiblePosition RenderBR::positionForCoordinates(int /*x*/, int /*y*/)

{

    return VisiblePosition(element(), 0, DOWNSTREAM);

}

InlineBox* RenderBR::inlineBox(int /*offset*/, EAffinity /*affinity*/)

{

    return firstTextBox();

}

} // namespace WebCore