/*

 * Copyright (C) 2010 Alex Milowski (alex@milowski.com). 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "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 THE COPYRIGHT

 * OWNER 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"

#if ENABLE(MATHML)

#include "RenderMathMLRow.h"

#include "MathMLNames.h"

#include "RenderMathMLOperator.h"

namespace WebCore {

using namespace MathMLNames;

RenderMathMLRow::RenderMathMLRow(Node* row)

    : RenderMathMLBlock(row)

{

}

int RenderMathMLRow::nonOperatorHeight() const

{

    int maxHeight = 0;

    for (RenderObject* current = firstChild(); current; current = current->nextSibling()) {

        if (current->isRenderMathMLBlock()) {

            RenderMathMLBlock* block = toRenderMathMLBlock(current);

            int blockHeight = block->nonOperatorHeight();

            // Check to see if this box has a larger height

            if (blockHeight > maxHeight)

                maxHeight = blockHeight;

        } else if (current->isBoxModelObject()) {

            RenderBoxModelObject* box = toRenderBoxModelObject(current);

            // Check to see if this box has a larger height

            if (box->offsetHeight() > maxHeight)

                maxHeight = box->offsetHeight();

        }

    }

    return maxHeight;

}

void RenderMathMLRow::layout() 

{

    RenderBlock::layout();

    // Calculate the maximum height of the row without the operators.

    int maxHeight = nonOperatorHeight();

    // Notify contained operators they may need to re-layout their stretched operators.

    // We need to keep track of the number of children and operators because a row of

    // operators needs some special handling.

    int childCount = 0;

    int operatorCount = 0;

    for (RenderObject* current = firstChild(); current; current = current->nextSibling()) {

        childCount++;

        if (current->isRenderMathMLBlock()) {

            RenderMathMLBlock* block = toRenderMathMLBlock(current);

            block->stretchToHeight(maxHeight);

            if (block->isRenderMathMLOperator()) 

                operatorCount++;

        }

    }

    // Layout the non-operators which have just been stretched.

    setNeedsLayoutAndPrefWidthsRecalc();

    markContainingBlocksForLayout();

    RenderBlock::layout();

    // Make a second pass with the real height of the operators.

    int operatorHeight = 0;

    for (RenderObject* current = firstChild(); current; current = current->nextSibling()) {

        if (current->isRenderMathMLBlock()) {

            RenderMathMLBlock* block = toRenderMathMLBlock(current);

            if (!block->hasBase() && !block->isRenderMathMLOperator()) {

                // Check to see if this box has a larger height.

                if (block->offsetHeight() > maxHeight)

                    maxHeight = block->offsetHeight();

            }

            if (block->isRenderMathMLOperator())

                if (block->offsetHeight() > operatorHeight)

                    operatorHeight = block->offsetHeight();

        } else if (current->isBoxModelObject()) {

            RenderBoxModelObject* box = toRenderBoxModelObject(current);

            // Check to see if this box has a larger height.

            if (box->offsetHeight() > maxHeight)

                maxHeight = box->offsetHeight();

        }

    }

    if (childCount > 0 && childCount == operatorCount) {

        // We have only operators and so set the max height to the operator height.

        maxHeight = operatorHeight;

    }

    int stretchHeight = maxHeight;

    // Stretch the operators again and re-calculate the row height.

    for (RenderObject* current = firstChild(); current; current = current->nextSibling()) {

        if (current->isRenderMathMLBlock()) {

            RenderMathMLBlock* block = toRenderMathMLBlock(current);

            if (block->isRenderMathMLOperator()) {

                RenderMathMLOperator* mathop = toRenderMathMLOperator(block);

                mathop->stretchToHeight(stretchHeight);

            } else {

                block->stretchToHeight(stretchHeight);

                RenderBoxModelObject* box = toRenderBoxModelObject(current);

                // Check to see if this box has a larger height

                if (box->offsetHeight() > maxHeight)

                    maxHeight = box->offsetHeight();

            }

        } else if (current->isBoxModelObject()) {

            RenderBoxModelObject* box = toRenderBoxModelObject(current);

            // Check to see if this box has a larger height

            if (box->offsetHeight() > maxHeight)

                maxHeight = box->offsetHeight();

        }

    }

    // Mark outself as needing layout and do the final layout of the row.

    setNeedsLayoutAndPrefWidthsRecalc();

    markContainingBlocksForLayout();

    RenderBlock::layout();

}    

int RenderMathMLRow::baselinePosition(bool firstLine, bool isRootLineBox) const

{

    if (firstChild() && firstChild()->isRenderMathMLBlock()) {

        RenderMathMLBlock* block = toRenderMathMLBlock(firstChild());

        if (block->isRenderMathMLOperator())

            return block->baselinePosition(firstLine, isRootLineBox);

    }

    return RenderBlock::baselinePosition(firstLine, isRootLineBox);

}

}

#endif // ENABLE(MATHML)