render_table.cpp

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/**
 * This file is part of the DOM implementation for KDE.
 *
 * Copyright (C) 1997 Martin Jones ([e-mail])
 *           (C) 1997 Torben Weis ([e-mail])
 *           (C) 1998 Waldo Bastian ([e-mail])
 *           (C) 1999 Lars Knoll ([e-mail])
 *           (C) 1999 Antti Koivisto ([e-mail])
 * Copyright (C) 2003 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

//#define TABLE_DEBUG
//#define TABLE_PRINT
//#define DEBUG_LAYOUT
//#define BOX_DEBUG
#include "rendering/render_table.h"
#include "rendering/table_layout.h"
#include "html/html_tableimpl.h"
#include "misc/htmltags.h"
#include "misc/htmlattrs.h"
#include "xml/dom_docimpl.h"

#include <kglobal.h>

#include <qapplication.h>
#include <qstyle.h>

#include <kdebug.h>
#include <assert.h>

#include "khtmlview.h"

using namespace khtml;
using namespace DOM;

RenderTable::RenderTable(DOM::NodeImpl* node)
    : RenderBlock(node)
{

    tCaption = 0;
    head = foot = firstBody = 0;
    tableLayout = 0;
    m_currentBorder = 0;

    rules = None;
    frame = Void;
    has_col_elems = false;
    hspacing = 0;
    vspacing = 0;
    padding = 0;
    needSectionRecalc = false;
    padding = 0;

    columnPos.resize( 2 );
    columnPos.fill( 0 );
    columns.resize( 1 );
    columns.fill( ColumnStruct() );

    columnPos[0] = 0;
}

RenderTable::~RenderTable()
{
    delete tableLayout;
}

void RenderTable::setStyle(RenderStyle *_style)
{
    ETableLayout oldTableLayout = style() ? style()->tableLayout() : TAUTO;
    RenderBlock::setStyle(_style);

    // In the collapsed border model, there is no cell spacing.
    hspacing = collapseBorders() ? 0 : style()->horizontalBorderSpacing();
    vspacing = collapseBorders() ? 0 : style()->verticalBorderSpacing();
    columnPos[0] = hspacing;

    if ( !tableLayout || style()->tableLayout() != oldTableLayout ) {
	delete tableLayout;

        // According to the CSS2 spec, you only use fixed table layout if an
        // explicit width is specified on the table.  Auto width implies auto table layout.
	if (style()->tableLayout() == TFIXED && !style()->width().isVariable()) {
	    tableLayout = new FixedTableLayout(this);
#ifdef DEBUG_LAYOUT
	    kdDebug( 6040 ) << "using fixed table layout" << endl;
#endif
	} else
	    tableLayout = new AutoTableLayout(this);
    }
}

void RenderTable::addChild(RenderObject *child, RenderObject *beforeChild)
{
#ifdef DEBUG_LAYOUT
    kdDebug( 6040 ) << renderName() << "(Table)::addChild( " << child->renderName() << ", " <<
                       (beforeChild ? beforeChild->renderName() : "0") << " )" << endl;
#endif
    RenderObject *o = child;

    if (child->element() && child->element()->id() == ID_FORM) {
        RenderContainer::addChild(child,beforeChild);
        return;
    }

    switch(child->style()->display())
    {
    case TABLE_CAPTION:
        tCaption = static_cast<RenderBlock *>(child);
        break;
    case TABLE_COLUMN:
    case TABLE_COLUMN_GROUP:
	has_col_elems = true;
        break;
    case TABLE_HEADER_GROUP:
	if ( !head )
	    head = static_cast<RenderTableSection *>(child);
	else if ( !firstBody )
            firstBody = static_cast<RenderTableSection *>(child);
        break;
    case TABLE_FOOTER_GROUP:
	if ( !foot ) {
	    foot = static_cast<RenderTableSection *>(child);
	    break;
	}
	// fall through
    case TABLE_ROW_GROUP:
        if(!firstBody)
            firstBody = static_cast<RenderTableSection *>(child);
        break;
    default:
        if ( !beforeChild && lastChild() &&
	     lastChild()->isTableSection() && lastChild()->isAnonymous() ) {
            o = lastChild();
        } else {
	    RenderObject *lastBox = beforeChild;
	    while ( lastBox && lastBox->parent()->isAnonymous() &&
		    !lastBox->isTableSection() && lastBox->style()->display() != TABLE_CAPTION )
		lastBox = lastBox->parent();
	    if ( lastBox && lastBox->isAnonymous() ) {
		lastBox->addChild( child, beforeChild );
		return;
	    } else {
		if ( beforeChild && !beforeChild->isTableSection() )
		    beforeChild = 0;
  		//kdDebug( 6040 ) << this <<" creating anonymous table section beforeChild="<< beforeChild << endl;
		o = new (renderArena()) RenderTableSection(document() /* anonymous */);
		RenderStyle *newStyle = new (renderArena()) RenderStyle();
		newStyle->inheritFrom(style());
                newStyle->setDisplay(TABLE_ROW_GROUP);
		o->setStyle(newStyle);
		addChild(o, beforeChild);
	    }
        }
        o->addChild(child);
        child->setNeedsLayoutAndMinMaxRecalc();
	return;
    }
    RenderContainer::addChild(child,beforeChild);
}



void RenderTable::calcWidth()
{
    if ( isPositioned() ) {
        calcAbsoluteHorizontal();
    }

    RenderBlock *cb = containingBlock();
    int availableWidth = cb->contentWidth();

    LengthType widthType = style()->width().type;
    if (widthType > Relative && style()->width().value > 0) {
	// Percent or fixed table
        m_width = style()->width().minWidth( availableWidth );
        if(m_minWidth > m_width) m_width = m_minWidth;
    }
    else {
        // An auto width table should shrink to fit within the line width if necessary in order to
        // avoid overlapping floats.
        availableWidth = cb->lineWidth( m_y );

        // Subtract out any fixed margins from our available width for auto width tables.
        int marginTotal = 0;
        if (style()->marginLeft().type != Variable)
            marginTotal += style()->marginLeft().width(availableWidth);
        if (style()->marginRight().type != Variable)
            marginTotal += style()->marginRight().width(availableWidth);

        // Subtract out our margins to get the available content width.
        int availContentWidth = kMax(0, availableWidth - marginTotal);

        // Ensure we aren't bigger than our max width or smaller than our min width.
        m_width = kMin(availContentWidth, m_maxWidth);
    }

    m_width = kMax(m_width, m_minWidth);

    // Finally, with our true width determined, compute our margins for real.
    m_marginRight = 0;
    m_marginLeft = 0;
    calcHorizontalMargins(style()->marginLeft(),style()->marginRight(),availableWidth);
}

void RenderTable::layout()
{
    KHTMLAssert( needsLayout() );
    KHTMLAssert( minMaxKnown() );
    KHTMLAssert( !needSectionRecalc );

    if (posChildNeedsLayout() && !normalChildNeedsLayout() && !selfNeedsLayout()) {
        // All we have to is lay out our positioned objects.
        layoutPositionedObjects(true);
        setNeedsLayout(false);
        return;
    }

    QRect oldBounds, oldFullBounds;
    bool checkForRepaint = checkForRepaintDuringLayout();
    if (checkForRepaint)
        getAbsoluteRepaintRectIncludingFloats(oldBounds, oldFullBounds);

    //kdDebug( 6040 ) << renderName() << "(Table)"<< this << " ::layout0() width=" << width() << ", needsLayout=" << needsLayout() << endl;

    m_height = m_overflowHeight = 0;
    initMaxMarginValues();

    //int oldWidth = m_width;
    calcWidth();
    m_overflowWidth = m_width;

    // the optimisation below doesn't work since the internal table
    // layout could have changed.  we need to add a flag to the table
    // layout that tells us if something has changed in the min max
    // calculations to do it correctly.
//     if ( oldWidth != m_width || columns.size() + 1 != columnPos.size() )
    tableLayout->layout();

#ifdef DEBUG_LAYOUT
    kdDebug( 6040 ) << renderName() << "(Table)::layout1() width=" << width() << ", marginLeft=" << marginLeft() << " marginRight=" << marginRight() << endl;
#endif

    setCellWidths();

    // layout child objects
    int calculatedHeight = 0;

    RenderObject *child = firstChild();
    while( child ) {
	if ( child->needsLayout() && !(child->element() && child->element()->id() == ID_FORM))
	    child->layout();
	if ( child->isTableSection() ) {
	    static_cast<RenderTableSection *>(child)->calcRowHeight();
	    calculatedHeight += static_cast<RenderTableSection *>(child)->layoutRows( 0 );
	}
	child = child->nextSibling();
    }

    // ### collapse caption margin
    if(tCaption && tCaption->style()->captionSide() != CAPBOTTOM) {
        tCaption->setPos(tCaption->marginLeft(), m_height);
        m_height += tCaption->height() + tCaption->marginTop() + tCaption->marginBottom();
    }

    int bpTop = borderTop() + (collapseBorders() ? 0 : paddingTop());
    int bpBottom = borderBottom() + (collapseBorders() ? 0 : paddingBottom());

    m_height += bpTop;

    int oldHeight = m_height;
    calcHeight();
    int newHeight = m_height;
    m_height = oldHeight;

    Length h = style()->height();
    int th = 0;
    if (isPositioned())
        th = newHeight; // FIXME: Leave this alone for now but investigate later.
    else if (h.isFixed())
        th = h.value - (bpTop + bpBottom);  // Tables size as though CSS height includes border/padding.
    else if (h.isPercent())
        th = calcPercentageHeight(h);
    th = kMax(0, th);

    // layout rows
    if ( th > calculatedHeight ) {
	// we have to redistribute that height to get the constraint correctly
	// just force the first body to the height needed
	// ### FIXME This should take height constraints on all table sections into account and distribute
	// accordingly. For now this should be good enough
        if (firstBody) {
            firstBody->calcRowHeight();
            firstBody->layoutRows( th - calculatedHeight );
        }
    }

    int bl = borderLeft();
    if (!collapseBorders())
        bl += paddingLeft();

    // position the table sections
    if ( head ) {
	head->setPos(bl, m_height);
	m_height += head->height();
    }
    RenderObject *body = firstBody;
    while ( body ) {
	if ( body != head && body != foot && body->isTableSection() ) {
	    body->setPos(bl, m_height);
	    m_height += body->height();
	}
	body = body->nextSibling();
    }
    if ( foot ) {
	foot->setPos(bl, m_height);
	m_height += foot->height();
    }

    m_height += bpBottom;

    if(tCaption && tCaption->style()->captionSide()==CAPBOTTOM) {
        tCaption->setPos(tCaption->marginLeft(), m_height);
        m_height += tCaption->height() + tCaption->marginTop() + tCaption->marginBottom();
    }

    //kdDebug(0) << "table height: " << m_height << endl;

    // table can be containing block of positioned elements.
    // ### only pass true if width or height changed.
    layoutPositionedObjects( true );

    // Repaint with our new bounds if they are different from our old bounds.
    if (checkForRepaint)
        repaintAfterLayoutIfNeeded(oldBounds, oldFullBounds);

    m_overflowHeight = kMax(m_overflowHeight, m_height);
    m_overflowWidth = kMax(m_overflowWidth, m_width);

    setNeedsLayout(false);
}

void RenderTable::setCellWidths()
{
#ifdef DEBUG_LAYOUT
    kdDebug( 6040 ) << renderName() << "(Table, this=0x" << this << ")::setCellWidths()" << endl;
#endif

    RenderObject *child = firstChild();
    while( child ) {
	if ( child->isTableSection() )
	    static_cast<RenderTableSection *>(child)->setCellWidths();
	child = child->nextSibling();
    }
}

void RenderTable::paint(PaintInfo& i, int _tx, int _ty)
{
    _tx += xPos();
    _ty += yPos();

    PaintAction paintAction = i.phase;

#ifdef TABLE_PRINT
    kdDebug( 6040 ) << "RenderTable::paint() w/h = (" << width() << "/" << height() << ")" << endl;
#endif

    int os = 2*maximalOutlineSize(paintAction);
    if ((_ty >= i.r.y() + i.r.height() + os) || (_ty + height() <= i.r.y() - os)) return;
    if ((_tx >= i.r.x() + i.r.width() + os) || (_tx + width() <= i.r.x() - os)) return;

#ifdef TABLE_PRINT
    kdDebug( 6040 ) << "RenderTable::paint(2) " << _tx << "/" << _ty << " (" << _y << "/" << _h << ")" << endl;
#endif

    if ((paintAction == PaintActionBlockBackground || paintAction == PaintActionChildBlockBackground)
        && shouldPaintBackgroundOrBorder() && style()->visibility() == VISIBLE)
        paintBoxDecorations(i, _tx, _ty);

    // We're done.  We don't bother painting any children.
    if (paintAction == PaintActionBlockBackground)
        return;
    // We don't paint our own background, but we do let the kids paint their backgrounds.
    if (paintAction == PaintActionChildBlockBackgrounds)
        paintAction = PaintActionChildBlockBackground;