render_object.cpp

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

            if ( state.m_lastNode ) {
                node = state.m_lastNode;
                offset = state.m_lastOffset;
                //kdDebug(6030) << "RenderObject::checkSelectionPoint " << this << " before this child "
                //              << node << "-> returning SelectionPointInside, offset=" << offset << endl;
                return SelectionPointInside;
            } else {
                node = nod;
                offset = off;
                //kdDebug(6030) << "RenderObject::checkSelectionPoint " << this << " before us -> returning SelectionPointBefore " << node << "/" << offset << endl;
                return SelectionPointBefore;
            }
            break;
        case SelectionPointAfter:
            if (state.m_afterInLine) break;
            // fall through
        case SelectionPointAfterInLine:
            if (pos == SelectionPointAfterInLine) state.m_afterInLine = true;
            //kdDebug(6030) << "RenderObject::checkSelectionPoint: selection after: " << nod << " offset: " << off << " afterInLine: " << state.m_afterInLine << endl;
            state.m_lastNode = nod;
            state.m_lastOffset = off;
            // No "return" here, obviously. We must keep looking into the children.
            break;
        }
    }
    // If we are after the last child, return lastNode/lastOffset
    // But lastNode can be 0L if there is no child, for instance.
    if ( state.m_lastNode )
    {
        node = state.m_lastNode;
        offset = state.m_lastOffset;
    }
    //kdDebug(6030) << "fallback - SelectionPointAfter  node=" << node << " offset=" << offset << endl;
    return SelectionPointAfter;
}

bool RenderObject::mouseInside() const
{
    if (!m_mouseInside && continuation())
        return continuation()->mouseInside();
    return m_mouseInside;
}

bool RenderObject::nodeAtPoint(NodeInfo& info, int _x, int _y, int _tx, int _ty, HitTestAction hitTestAction, bool inside)
{
    int tx = _tx + xPos();
    int ty = _ty + yPos();

    inside |= ( style()->visibility() != HIDDEN &&
                (_y >= ty) && (_y < ty + height()) && (_x >= tx) && (_x < tx + width())) || isRoot() || isBody();
    bool inOverflowRect = inside;
    if ( !inOverflowRect ) {
        QRect overflowRect( tx, ty, overflowWidth(), overflowHeight() );
        inOverflowRect = overflowRect.contains( _x, _y );
    }

    // ### table should have its own, more performant method
    if (hitTestAction != HitTestSelfOnly &&
        (( !isRenderBlock() ||
           !static_cast<RenderBlock*>( this )->isPointInScrollbar( _x, _y, _tx, _ty )) &&
        (overhangingContents() || inOverflowRect || isInline() || isRoot() || isCanvas() ||
        isTableRow() || isTableSection() || inside || mouseInside() ))) {
        if ( hitTestAction == HitTestChildrenOnly )
            inside = false;
        if ( style()->hidesOverflow() && layer() )
            layer()->subtractScrollOffset(tx, ty);
        for (RenderObject* child = lastChild(); child; child = child->previousSibling())
            if (!child->layer() && child->nodeAtPoint(info, _x, _y, tx, ty, HitTestAll))
                inside = true;
    }

    if (inside) {
        if (!info.innerNode() && !isInline() && continuation()) {
            // We are in the margins of block elements that are part of a continuation.  In
            // this case we're actually still inside the enclosing inline element that was
            // split.  Go ahead and set our inner node accordingly.
            info.setInnerNode(continuation()->element());
            if (!info.innerNonSharedNode())
                info.setInnerNonSharedNode(continuation()->element());
        }

        if (info.innerNode() && info.innerNode()->renderer() &&
            !info.innerNode()->renderer()->isInline() && element() && isInline()) {
            // Within the same layer, inlines are ALWAYS fully above blocks.  Change inner node.
            info.setInnerNode(element());

            // Clear everything else.
            info.setInnerNonSharedNode(0);
            info.setURLElement(0);
        }

        if (!info.innerNode() && element())
            info.setInnerNode(element());

        if(!info.innerNonSharedNode() && element())
            info.setInnerNonSharedNode(element());

    }

    return inside;
}

short RenderObject::verticalPositionHint( bool firstLine ) const
{
    short vpos = m_verticalPosition;
    if ( m_verticalPosition == PositionUndefined || firstLine ) {
        vpos = getVerticalPosition( firstLine );
        if ( !firstLine )
            const_cast<RenderObject *>(this)->m_verticalPosition = vpos;
    }
    return vpos;

}

short RenderObject::getVerticalPosition( bool firstLine, RenderObject* ref ) const
{
    // vertical align for table cells has a different meaning
    int vpos = 0;
    if ( !isTableCell() && isInline() ) {
        EVerticalAlign va = style()->verticalAlign();
        if ( va == TOP ) {
            vpos = PositionTop;
        } else if ( va == BOTTOM ) {
            vpos = PositionBottom;
        } else {
            if (!ref) ref = parent();
            bool checkParent = ref->isInline() && !ref->isReplacedBlock() &&
                               !( ref->style()->verticalAlign() == TOP || ref->style()->verticalAlign() == BOTTOM );
            vpos = checkParent ? ref->verticalPositionHint( firstLine ) : 0;
            // don't allow elements nested inside text-top to have a different valignment.
            if ( va == BASELINE )
                return vpos;
            else if ( va == LENGTH )
                return vpos - style()->verticalAlignLength().width( lineHeight( firstLine ) );

            const QFont &f = ref->font( firstLine );
            int fontheight = ref->lineHeight( firstLine );
            int fontsize = f.pixelSize();
            int halfleading = ( fontheight - fontsize ) / 2;

            if ( va == SUB )
                vpos += fontsize/5 + 1;
            else if ( va == SUPER )
                vpos -= fontsize/3 + 1;
            else if ( va == TEXT_TOP ) {
//                 qDebug( "got TEXT_TOP vertical pos hint" );
//                 qDebug( "parent:" );
//                 qDebug( "CSSLH: %d, CSS_FS: %d, basepos: %d", fontheight, fontsize, ref->baselinePosition( firstLine ) );
//                 qDebug( "this:" );
//                 qDebug( "CSSLH: %d, CSS_FS: %d, basepos: %d", lineHeight( firstLine ), style()->font().pixelSize(), baselinePosition( firstLine ) );
                vpos += ( baselinePosition( firstLine ) - ref->baselinePosition( firstLine ) +
                        halfleading );
            } else if ( va == MIDDLE ) {
                QRect b = QFontMetrics(f).boundingRect('x');
                vpos += -b.height()/2 - lineHeight( firstLine )/2 + baselinePosition( firstLine );
            } else if ( va == TEXT_BOTTOM ) {
                vpos += QFontMetrics(f).descent();
                if ( !isReplaced() )
                    vpos -= fontMetrics(firstLine).descent();
            } else if ( va == BASELINE_MIDDLE )
                vpos += - lineHeight( firstLine )/2 + baselinePosition( firstLine );
        }
    }
    return vpos;
}

short RenderObject::lineHeight( bool firstLine ) const
{
    // Inline blocks are replaced elements. Otherwise, just pass off to
    // the base class.  If we're being queried as though we're the root line
    // box, then the fact that we're an inline-block is irrelevant, and we behave
    // just like a block.

    if (isReplaced() && (!isInlineBlockOrInlineTable() || !needsLayout()))
        return height()+marginTop()+marginBottom();

    Length lh;
    if( firstLine && hasFirstLine() ) {
        RenderStyle *pseudoStyle  = style()->getPseudoStyle(RenderStyle::FIRST_LINE);
        if ( pseudoStyle )
            lh = pseudoStyle->lineHeight();
    }
    else
        lh = style()->lineHeight();

    // its "unset", choose nice default
    if ( lh.value() < 0 )
        return style()->fontMetrics().lineSpacing();

    if ( lh.isPercent() )
        return lh.minWidth( style()->font().pixelSize() );

    // its fixed
    return lh.value();
}

short RenderObject::baselinePosition( bool firstLine ) const
{
    // Inline blocks are replaced elements. Otherwise, just pass off to
    // the base class.  If we're being queried as though we're the root line
    // box, then the fact that we're an inline-block is irrelevant, and we behave
    // just like a block.

    if (isReplaced() && (!isInlineBlockOrInlineTable() || !needsLayout()))
        return height()+marginTop()+marginBottom();

    const QFontMetrics &fm = fontMetrics( firstLine );
    return fm.ascent() + ( lineHeight( firstLine) - fm.height() ) / 2;
}

void RenderObject::invalidateVerticalPositions()
{
    m_verticalPosition = PositionUndefined;
    RenderObject *child = firstChild();
    while( child ) {
        child->invalidateVerticalPositions();
        child = child->nextSibling();
    }
}

void RenderObject::recalcMinMaxWidths()
{
    KHTMLAssert( m_recalcMinMax );

#ifdef DEBUG_LAYOUT
    kdDebug( 6040 ) << renderName() << " recalcMinMaxWidths() this=" << this <<endl;
#endif

    RenderObject *child = firstChild();
    int cmin=0;
    int cmax=0;

    while( child ) {
        bool test = false;
        if ( ( m_minMaxKnown && child->m_recalcMinMax ) || !child->m_minMaxKnown ) {
            cmin = child->minWidth();
            cmax = child->maxWidth();
            test = true;
        }
        if ( child->m_recalcMinMax )
            child->recalcMinMaxWidths();
        if ( !child->m_minMaxKnown )
            child->calcMinMaxWidth();
        if ( m_minMaxKnown && test && (cmin != child->minWidth() || cmax != child->maxWidth()) )
            m_minMaxKnown = false;
        child = child->nextSibling();
    }

    // we need to recalculate, if the contains inline children, as the change could have
    // happened somewhere deep inside the child tree
    if ( ( !isInline() || isReplacedBlock() ) && childrenInline() )
        m_minMaxKnown = false;

    if ( !m_minMaxKnown )
        calcMinMaxWidth();
    m_recalcMinMax = false;
}

void RenderObject::scheduleRelayout(RenderObject *clippedObj)
{
    if (!isCanvas()) return;
    KHTMLView *view = static_cast<RenderCanvas *>(this)->view();
    if ( view )
        view->scheduleRelayout(clippedObj);
}


void RenderObject::removeLeftoverAnonymousBoxes()
{
}

InlineBox* RenderObject::createInlineBox(bool /*makePlaceHolderBox*/, bool /*isRootLineBox*/)
{
    KHTMLAssert(false);
    return 0;
}

void RenderObject::getTextDecorationColors(int decorations, QColor& underline, QColor& overline,
                                           QColor& linethrough, bool quirksMode)
{
    RenderObject* curr = this;
    do {
        RenderStyle *st = curr->style();
        int currDecs = st->textDecoration();
        if (currDecs) {
            if (currDecs & UNDERLINE) {
                decorations &= ~UNDERLINE;
                underline = st->color();
            }
            if (currDecs & OVERLINE) {
                decorations &= ~OVERLINE;
                overline = st->color();
            }
            if (currDecs & LINE_THROUGH) {
                decorations &= ~LINE_THROUGH;
                linethrough = st->color();
            }
        }
        curr = curr->parent();
        if (curr && curr->isRenderBlock() && curr->continuation())
            curr = curr->continuation();
    } while (curr && decorations && (!quirksMode || !curr->element() ||
                                     (curr->element()->id() != ID_A && curr->element()->id() != ID_FONT)));

    // If we bailed out, use the element we bailed out at (typically a <font> or <a> element).
    if (decorations && curr) {
        RenderStyle *st = curr->style();
        if (decorations & UNDERLINE)
            underline = st->color();
        if (decorations & OVERLINE)
            overline = st->color();
        if (decorations & LINE_THROUGH)
            linethrough = st->color();
    }
}

int RenderObject::maximalOutlineSize(PaintAction p) const
{
    if (p != PaintActionOutline)
        return 0;
    return static_cast<RenderCanvas*>(document()->renderer())->maximalOutlineSize();
}

void RenderObject::collectBorders(QValueList<CollapsedBorderValue>& borderStyles)
{
    for (RenderObject* curr = firstChild(); curr; curr = curr->nextSibling())
        curr->collectBorders(borderStyles);
}

bool RenderObject::flowAroundFloats() const
{
    return isReplaced() || hasOverflowClip() || style()->flowAroundFloats();
}

bool RenderObject::usesLineWidth() const
{
    // 1. All auto-width objects that avoid floats should always use lineWidth
    // 2. For objects with a specified width, we match WinIE's behavior:
    // (a) tables use contentWidth
    // (b) <hr>s use lineWidth
    // (c) all other objects use lineWidth in quirks mode and contentWidth in strict mode.
    return (flowAroundFloats() && (style()->width().isVariable() || isHR() || (style()->htmlHacks() && !isTable())));
}

bool RenderObject::hasCounter(const QString& counter) const
{
    if (style() && (!isText() || isCounter())) {
        if (lookupCounter(counter)) return true;
        if (style()->hasCounterReset(counter)) {
            return true;
        }
        else if (style()->hasCounterIncrement(counter)) {
            return true;
        }
    }
    if (counter == "list-item") {
        if (isListItem()) return true;
        if (element() && (
                element()->id() == ID_OL ||
                element()->id() == ID_UL ||
                element()->id() == ID_MENU ||
                element()->id() == ID_DIR))
            return true;
    } else
    if (counter == "-khtml-quotes" && isQuote()) {
        return (static_cast<const RenderQuote*>(this)->quoteCount() != 0);
    }
    return false;
}

CounterNode* RenderObject::getCounter(const QString& counter, bool view, bool counters)
{
//     kdDebug( 6040 ) << renderName() << " getCounter(" << counter << ")" << endl;

    if (!style()) return 0;

    if (isText() && !isCounter()) return 0;

    CounterNode *i = lookupCounter(counter);
    if (i) return i;
    int val = 0;

    if (style()->hasCounterReset(counter) || isRoot()) {
        i = new CounterReset(this);
        val = style()->counterReset(counter);
//         kdDebug( 6040 ) << renderName() << " counter-reset: " << counter << " " << val << endl;
    }
    else
    if (style()->hasCounterIncrement(counter)) {
        i = new CounterNode(this);
        val = style()->counterIncrement(counter);
//         kdDebug( 6040 ) << renderName() << " counter-increment: " << counter << " " << val << endl;
    }
    else if (counter == "list-item") {
        if (isListItem()) {
            if (element() && element()->id() ==