/**
 * Copyright (C) 1997 Martin Jones (mjones@kde.org)
 *           (C) 1997 Torben Weis (weis@kde.org)
 *           (C) 1998 Waldo Bastian (bastian@kde.org)
 *           (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
 *
 * 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 "core/rendering/RenderTableRow.h"

#include "HTMLNames.h"
#include "core/dom/Document.h"
#include "core/fetch/ImageResource.h"
#include "core/rendering/HitTestResult.h"
#include "core/rendering/PaintInfo.h"
#include "core/rendering/RenderTableCell.h"
#include "core/rendering/RenderView.h"
#include "core/rendering/SubtreeLayoutScope.h"
#include "core/rendering/style/StyleInheritedData.h"

namespace WebCore {

using namespace HTMLNames;

RenderTableRow::RenderTableRow(Element* element)
    : RenderBox(element)
    , m_rowIndex(unsetRowIndex)
{
    // init RenderObject attributes
    setInline(false);   // our object is not Inline
}

void RenderTableRow::willBeRemovedFromTree()
{
    RenderBox::willBeRemovedFromTree();

    section()->setNeedsCellRecalc();
}

static bool borderWidthChanged(const RenderStyle* oldStyle, const RenderStyle* newStyle)
{
    return oldStyle->borderLeftWidth() != newStyle->borderLeftWidth()
        || oldStyle->borderTopWidth() != newStyle->borderTopWidth()
        || oldStyle->borderRightWidth() != newStyle->borderRightWidth()
        || oldStyle->borderBottomWidth() != newStyle->borderBottomWidth();
}

void RenderTableRow::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
    ASSERT(style()->display() == TABLE_ROW);

    RenderBox::styleDidChange(diff, oldStyle);
    propagateStyleToAnonymousChildren();

    if (section() && oldStyle && style()->logicalHeight() != oldStyle->logicalHeight())
        section()->rowLogicalHeightChanged(rowIndex());

    // If border was changed, notify table.
    if (parent()) {
        RenderTable* table = this->table();
        if (table && !table->selfNeedsLayout() && !table->normalChildNeedsLayout() && oldStyle && oldStyle->border() != style()->border())
            table->invalidateCollapsedBorders();

        if (table && oldStyle && diff == StyleDifferenceLayout && needsLayout() && table->collapseBorders() && borderWidthChanged(oldStyle, style())) {
            // If the border width changes on a row, we need to make sure the cells in the row know to lay out again.
            // This only happens when borders are collapsed, since they end up affecting the border sides of the cell
            // itself.
            for (RenderBox* childBox = firstChildBox(); childBox; childBox = childBox->nextSiblingBox()) {
                if (!childBox->isTableCell())
                    continue;
                childBox->setChildNeedsLayout();
            }
        }
    }
}

const BorderValue& RenderTableRow::borderAdjoiningStartCell(const RenderTableCell* cell) const
{
    ASSERT_UNUSED(cell, cell->isFirstOrLastCellInRow());
    // FIXME: https://webkit.org/b/79272 - Add support for mixed directionality at the cell level.
    return style()->borderStart();
}

const BorderValue& RenderTableRow::borderAdjoiningEndCell(const RenderTableCell* cell) const
{
    ASSERT_UNUSED(cell, cell->isFirstOrLastCellInRow());
    // FIXME: https://webkit.org/b/79272 - Add support for mixed directionality at the cell level.
    return style()->borderEnd();
}

void RenderTableRow::addChild(RenderObject* child, RenderObject* beforeChild)
{
    if (!child->isTableCell()) {
        RenderObject* last = beforeChild;
        if (!last)
            last = lastChild();
        if (last && last->isAnonymous() && last->isTableCell() && !last->isBeforeOrAfterContent()) {
            if (beforeChild == last)
                beforeChild = last->firstChild();
            last->addChild(child, beforeChild);
            return;
        }

        if (beforeChild && !beforeChild->isAnonymous() && beforeChild->parent() == this) {
            RenderObject* cell = beforeChild->previousSibling();
            if (cell && cell->isTableCell() && cell->isAnonymous()) {
                cell->addChild(child);
                return;
            }
        }

        // If beforeChild is inside an anonymous cell, insert into the cell.
        if (last && !last->isTableCell() && last->parent() && last->parent()->isAnonymous() && !last->parent()->isBeforeOrAfterContent()) {
            last->parent()->addChild(child, beforeChild);
            return;
        }

        RenderTableCell* cell = RenderTableCell::createAnonymousWithParentRenderer(this);
        addChild(cell, beforeChild);
        cell->addChild(child);
        return;
    }

    if (beforeChild && beforeChild->parent() != this)
        beforeChild = splitAnonymousBoxesAroundChild(beforeChild);

    RenderTableCell* cell = toRenderTableCell(child);

    // Generated content can result in us having a null section so make sure to null check our parent.
    if (parent())
        section()->addCell(cell, this);

    ASSERT(!beforeChild || beforeChild->isTableCell());
    RenderBox::addChild(cell, beforeChild);

    if (beforeChild || nextSibling())
        section()->setNeedsCellRecalc();
}

void RenderTableRow::layout()
{
    ASSERT(needsLayout());

    // Table rows do not add translation.
    LayoutStateMaintainer statePusher(view(), this, LayoutSize(), style()->isFlippedBlocksWritingMode());

    bool paginated = view()->layoutState()->isPaginated();

    for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
        if (child->isTableCell()) {
            SubtreeLayoutScope layouter(child);
            RenderTableCell* cell = toRenderTableCell(child);
            if (!cell->needsLayout() && paginated && view()->layoutState()->pageLogicalHeight() && view()->layoutState()->pageLogicalOffset(cell, cell->logicalTop()) != cell->pageLogicalOffset())
                layouter.setChildNeedsLayout(cell);

            if (child->needsLayout()) {
                cell->computeAndSetBlockDirectionMargins(table());
                cell->layout();
            }
        }
    }

    // We only ever need to repaint if our cells didn't, which menas that they didn't need
    // layout, so we know that our bounds didn't change. This code is just making up for
    // the fact that we did not repaint in setStyle() because we had a layout hint.
    // We cannot call repaint() because our clippedOverflowRectForRepaint() is taken from the
    // parent table, and being mid-layout, that is invalid. Instead, we repaint our cells.
    if (selfNeedsLayout() && checkForRepaintDuringLayout()) {
        for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
            if (child->isTableCell())
                child->repaint();
        }
    }

    statePusher.pop();
    // RenderTableSection::layoutRows will set our logical height and width later, so it calls updateLayerTransform().
    clearNeedsLayout();
}

LayoutRect RenderTableRow::clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const
{
    ASSERT(parent());

    if (repaintContainer == this)
        return RenderBox::clippedOverflowRectForRepaint(repaintContainer);

    // For now, just repaint the whole table.
    // FIXME: Find a better way to do this, e.g., need to repaint all the cells that we
    // might have propagated a background color into.
    // FIXME: do repaintContainer checks here
    if (RenderTable* parentTable = table())
        return parentTable->clippedOverflowRectForRepaint(repaintContainer);

    return LayoutRect();
}

// Hit Testing
bool RenderTableRow::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction action)
{
    // Table rows cannot ever be hit tested.  Effectively they do not exist.
    // Just forward to our children always.
    for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
        // FIXME: We have to skip over inline flows, since they can show up inside table rows
        // at the moment (a demoted inline <form> for example). If we ever implement a
        // table-specific hit-test method (which we should do for performance reasons anyway),
        // then we can remove this check.
        if (child->isTableCell() && !toRenderBox(child)->hasSelfPaintingLayer()) {
            LayoutPoint cellPoint = flipForWritingModeForChild(toRenderTableCell(child), accumulatedOffset);
            if (child->nodeAtPoint(request, result, locationInContainer, cellPoint, action)) {
                updateHitTestResult(result, locationInContainer.point() - toLayoutSize(cellPoint));
                return true;
            }
        }
    }

    return false;
}

void RenderTableRow::paintOutlineForRowIfNeeded(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    LayoutPoint adjustedPaintOffset = paintOffset + location();
    PaintPhase paintPhase = paintInfo.phase;
    if ((paintPhase == PaintPhaseOutline || paintPhase == PaintPhaseSelfOutline) && style()->visibility() == VISIBLE)
        paintOutline(paintInfo, LayoutRect(adjustedPaintOffset, size()));
}

void RenderTableRow::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    ASSERT(hasSelfPaintingLayer());
    ANNOTATE_GRAPHICS_CONTEXT(paintInfo, this);

    paintOutlineForRowIfNeeded(paintInfo, paintOffset);
    for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
        if (child->isTableCell()) {
            // Paint the row background behind the cell.
            if (paintInfo.phase == PaintPhaseBlockBackground || paintInfo.phase == PaintPhaseChildBlockBackground) {
                RenderTableCell* cell = toRenderTableCell(child);
                cell->paintBackgroundsBehindCell(paintInfo, paintOffset, this);
            }
            if (!toRenderBox(child)->hasSelfPaintingLayer())
                child->paint(paintInfo, paintOffset);
        }
    }
}

void RenderTableRow::imageChanged(WrappedImagePtr, const IntRect*)
{
    // FIXME: Examine cells and repaint only the rect the image paints in.
    repaint();
}

RenderTableRow* RenderTableRow::createAnonymous(Document* document)
{
    RenderTableRow* renderer = new RenderTableRow(0);
    renderer->setDocumentForAnonymous(document);
    return renderer;
}

RenderTableRow* RenderTableRow::createAnonymousWithParentRenderer(const RenderObject* parent)
{
    RenderTableRow* newRow = RenderTableRow::createAnonymous(&parent->document());
    RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(parent->style(), TABLE_ROW);
    newRow->setStyle(newStyle.release());
    return newRow;
}

} // namespace WebCore
