render_list.cpp

konqueror3 embedded版本, KDE环境下的当家浏览器的嵌入式版本源码包.

/**
 * This file is part of the HTML rendering engine for KDE.
 *
 * Copyright (C) 1999-2003 Lars Knoll ([e-mail])
 *           (C) 1999 Antti Koivisto ([e-mail])
 *           (C) 2000-2002 Dirk Mueller ([e-mail])
 *           (C) 2003 Apple Computer, Inc.
 *           (C) 2004-2005 Allan Sandfeld Jensen ([e-mail])
 *
 * 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 "rendering/render_list.h"
#include "rendering/render_canvas.h"
#include "rendering/enumerate.h"
#include "rendering/counter_tree.h"
#include "html/html_listimpl.h"
#include "misc/helper.h"
#include "misc/htmltags.h"
#include "misc/loader.h"
#include "xml/dom_docimpl.h"

#include <kdebug.h>
#include <kglobal.h>
#include <qvaluelist.h>

//#define BOX_DEBUG

using namespace khtml;
using namespace Enumerate;

const int cMarkerPadding = 7;

// -------------------------------------------------------------------------

RenderListItem::RenderListItem(DOM::NodeImpl* node)
    : RenderBlock(node)
{
    // init RenderObject attributes
    setInline(false);   // our object is not Inline

    predefVal = -1;
    m_marker = 0;
    m_counter = 0;
    m_insideList = false;
    m_deleteMarker = false;
}

void RenderListItem::setStyle(RenderStyle *_style)
{
    RenderBlock::setStyle(_style);

    RenderStyle *newStyle = new RenderStyle();
    newStyle->ref();

    newStyle->inheritFrom(style());

    if(!m_marker && style()->listStyleType() != LNONE) {
        m_marker = new (renderArena()) RenderListMarker(element());
        m_marker->setIsAnonymous( true );
        m_marker->setStyle(newStyle);
        m_marker->setListItem( this );
        m_deleteMarker = true;
    } else if ( m_marker && style()->listStyleType() == LNONE) {
        m_marker->detach();
        m_marker = 0;
    }
    else if ( m_marker ) {
        m_marker->setStyle(newStyle);
    }

    newStyle->deref();
}

void RenderListItem::detach()
{
    if ( m_marker && m_deleteMarker )
        m_marker->detach();
    RenderBlock::detach();
}

static RenderObject* getParentOfFirstLineBox(RenderObject* curr, RenderObject* marker)
{
    RenderObject* firstChild = curr->firstChild();
    if (!firstChild)
        return 0;

    for (RenderObject* currChild = firstChild;
         currChild; currChild = currChild->nextSibling()) {
        if (currChild == marker)
            continue;

        if (currChild->isInline())
            return curr;

        if (currChild->isFloating() || currChild->isPositioned())
            continue;

        if (currChild->isTable() || !currChild->isRenderBlock())
            break;

        if (currChild->style()->htmlHacks() && currChild->element() &&
            (currChild->element()->id() == ID_UL || currChild->element()->id() == ID_OL))
            break;

        RenderObject* lineBox = getParentOfFirstLineBox(currChild, marker);
        if (lineBox)
            return lineBox;
    }

    return 0;
}


void RenderListItem::updateMarkerLocation()
{
    // Sanity check the location of our marker.
    if (m_marker) {
        RenderObject* markerPar = m_marker->parent();
        RenderObject* lineBoxParent = getParentOfFirstLineBox(this, m_marker);
        if (!lineBoxParent) {
            // If the marker is currently contained inside an anonymous box,
            // then we are the only item in that anonymous box (since no line box
            // parent was found).  It's ok to just leave the marker where it is
            // in this case.
            if (markerPar && markerPar->isAnonymousBlock())
                lineBoxParent = markerPar;
            else
                lineBoxParent = this;
        }
        if (markerPar != lineBoxParent)
        {
            if (markerPar)
                markerPar->removeChild(m_marker);
            if (!lineBoxParent)
                lineBoxParent = this;
            lineBoxParent->addChild(m_marker, lineBoxParent->firstChild());
            m_deleteMarker = false;
            if (!m_marker->minMaxKnown())
                m_marker->calcMinMaxWidth();
            recalcMinMaxWidths();
        }
    }
}

void RenderListItem::calcMinMaxWidth()
{
    // Make sure our marker is in the correct location.
    updateMarkerLocation();
    if (!minMaxKnown())
        RenderBlock::calcMinMaxWidth();
}
/*
short RenderListItem::marginLeft() const
{
    if (m_insideList)
        return RenderBlock::marginLeft();
    else
        return kMax(m_marker->markerWidth(), RenderBlock::marginLeft());
}

short RenderListItem::marginRight() const
{
    return RenderBlock::marginRight();
}*/

void RenderListItem::layout( )
{
    KHTMLAssert( needsLayout() );
    KHTMLAssert( minMaxKnown() );

    updateMarkerLocation();
    RenderBlock::layout();
}

// -----------------------------------------------------------

RenderListMarker::RenderListMarker(DOM::NodeImpl* node)
    : RenderBox(node), m_listImage(0), m_markerWidth(0)
{
    // init RenderObject attributes
    setInline(true);   // our object is Inline
    setReplaced(true); // pretend to be replaced
    // val = -1;
    // m_listImage = 0;
}

RenderListMarker::~RenderListMarker()
{
    if(m_listImage)
        m_listImage->deref(this);
}

void RenderListMarker::setStyle(RenderStyle *s)
{
    if ( s && style() && s->listStylePosition() != style()->listStylePosition() )
        setNeedsLayoutAndMinMaxRecalc();

    RenderBox::setStyle(s);

    if ( m_listImage != style()->listStyleImage() ) {
	if(m_listImage)  m_listImage->deref(this);
	m_listImage = style()->listStyleImage();
	if(m_listImage)  m_listImage->ref(this);
    }
}


void RenderListMarker::paint(PaintInfo& paintInfo, int _tx, int _ty)
{
    if (paintInfo.phase != PaintActionForeground)
        return;

    if (style()->visibility() != VISIBLE)  return;

    _tx += m_x;
    _ty += m_y;

    if((_ty > paintInfo.r.bottom()) || (_ty + m_height <= paintInfo.r.top()))
        return;

    if(shouldPaintBackgroundOrBorder())
        paintBoxDecorations(paintInfo, _tx, _ty);

    QPainter* p = paintInfo.p;
#ifdef DEBUG_LAYOUT
    kdDebug( 6040 ) << nodeName().string() << "(ListMarker)::paintObject(" << _tx << ", " << _ty << ")" << endl;
#endif
    p->setFont(style()->font());
    const QFontMetrics fm = p->fontMetrics();


    // The marker needs to adjust its tx, for the case where it's an outside marker.
    RenderObject* listItem = 0;
    int leftLineOffset = 0;
    int rightLineOffset = 0;
    if (!listPositionInside()) {
        listItem = this;
        int yOffset = 0;
        int xOffset = 0;
        while (listItem && listItem != m_listItem) {
            yOffset += listItem->yPos();
            xOffset += listItem->xPos();
            listItem = listItem->parent();
        }

        // Now that we have our xoffset within the listbox, we need to adjust ourselves by the delta
        // between our current xoffset and our desired position (which is just outside the border box
        // of the list item).
        if (style()->direction() == LTR) {
            leftLineOffset = m_listItem->leftRelOffset(yOffset, m_listItem->leftOffset(yOffset));
            _tx -= (xOffset - leftLineOffset) + m_listItem->paddingLeft() + m_listItem->borderLeft();
        }
        else {
            rightLineOffset = m_listItem->rightRelOffset(yOffset, m_listItem->rightOffset(yOffset));
            _tx += (rightLineOffset-xOffset) + m_listItem->paddingRight() + m_listItem->borderRight();
        }
    }

    int offset = fm.ascent()*2/3;
    bool haveImage = m_listImage && !m_listImage->isErrorImage();
    if (haveImage)
        offset = m_listImage->pixmap().width();

    int xoff = 0;
    int yoff = fm.ascent() - offset;

    int bulletWidth = offset/2;
    if (offset%2)
        bulletWidth++;
    if (!listPositionInside()) {
        if (listItem->style()->direction() == LTR)
            xoff = -cMarkerPadding - offset;
        else
            xoff = cMarkerPadding + (haveImage ? 0 : (offset - bulletWidth));
    }
    else if (style()->direction() == RTL)
        xoff += haveImage ? cMarkerPadding : (m_width - bulletWidth);

    if ( m_listImage && !m_listImage->isErrorImage()) {
	p->drawPixmap( QPoint( _tx + xoff, _ty ), m_listImage->pixmap());
        return;