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 (isInline()) { ts << " inline"; }
    if (isReplaced()) { ts << " replaced"; }
    if (shouldPaintBackgroundOrBorder()) { ts << " paintBackground"; }
    if (needsLayout()) { ts << " needsLayout"; }
    if (minMaxKnown()) { ts << " minMaxKnown"; }
    if (overhangingContents()) { ts << " overhangingContents"; }
    if (hasFirstLine()) { ts << " hasFirstLine"; }
    if (afterPageBreak()) { ts << " afterPageBreak"; }
}
#endif

void RenderObject::selectionStartEnd(int& spos, int& epos)
{
    if (parent())
        parent()->selectionStartEnd(spos, epos);
}

void RenderObject::setStyle(RenderStyle *style)
{
    if (m_style == style)
        return;

    RenderStyle::Diff d = m_style ? m_style->diff( style ) : RenderStyle::Layout;

    //qDebug("m_style: %p new style, diff=%d", m_style,  d);

    if ( d == RenderStyle::Visible && m_parent && m_style &&
         m_style->outlineWidth() > style->outlineWidth() )
        repaint();

    if ( m_style &&
         ( ( isFloating() && m_style->floating() != style->floating() ) ||
           ( isPositioned() && m_style->position() != style->position() &&
             style->position() != ABSOLUTE && style->position() != FIXED ) ) )
        removeFromObjectLists();

    // reset style flags
    m_floating = false;
    m_positioned = false;
    m_relPositioned = false;
    m_paintBackground = false;

    if ( style->position() == STATIC ) {
        if ( isRoot() )
            style->setZIndex( 0 );
        else
            style->setHasAutoZIndex();
    }

    if ( layer() && style && m_style ) {
        if ( ( m_style->hasAutoZIndex() != style->hasAutoZIndex() ||
               m_style->zIndex() != style->zIndex() ||
               m_style->visibility() != style->visibility() ) ) {
            layer()->stackingContext()->dirtyZOrderLists();
            layer()->dirtyZOrderLists();
        }
    }

    RenderStyle *oldStyle = m_style;
    m_style = style;

    updateBackgroundImages(oldStyle);

    if (m_style)
        m_style->ref();

    if (oldStyle)
        oldStyle->deref();

    setShouldPaintBackgroundOrBorder(m_style->hasBorder() || m_style->hasBackground());

    m_hasFirstLine = (style->getPseudoStyle(RenderStyle::FIRST_LINE) != 0);
    if (m_parent) {
        if ( d >= RenderStyle::Position ) {
            if (!isText() && d == RenderStyle::CbLayout) {
                dirtyFormattingContext( true );
            }
            setNeedsLayoutAndMinMaxRecalc();
        } else if (!isText() && d == RenderStyle::Visible) {
            if (layer() && !isInlineFlow())
                layer()->repaint();
            else
                repaint();
        }
    }
}

void RenderObject::dirtyFormattingContext( bool checkContainer )
{
    if (m_markedForRepaint && !checkContainer)
        return;
    m_markedForRepaint = true;
    if (layer() && (style()->position() == FIXED || style()->position() == ABSOLUTE))
        return;
    if (m_parent && (checkContainer || style()->width().isVariable() || style()->height().isVariable() ||
                     !(isFloating() || flowAroundFloats() || isTableCell())))
        m_parent->dirtyFormattingContext(false);
}

void RenderObject::repaintDuringLayout()
{
    if (canvas()->needsFullRepaint() || isText())
        return;
    if (layer() && !isInlineFlow()) {
        layer()->repaint( true );
    } else {
       repaint();
       canvas()->deferredRepaint( this );
    }
}

void RenderObject::setOverhangingContents(bool p)
{
    if (m_overhangingContents == p)
        return;

    RenderBlock *cb = containingBlock();
    if (p)
    {
        m_overhangingContents = true;
        KHTMLAssert( cb != this || isCanvas());
        if (cb && cb != this)
            cb->setOverhangingContents();
    }
    else
    {
        RenderObject *n;
        bool c=false;

        for( n = firstChild(); n != 0; n = n->nextSibling() )
        {
            if (n->isPositioned() || n->overhangingContents())
                c=true;
        }

        if (c)
            return;
        else
        {
            m_overhangingContents = false;
            KHTMLAssert( cb != this );
            if (cb && cb != this)
                cb->setOverhangingContents(false);
        }
    }
}

void RenderObject::updateBackgroundImages(RenderStyle* oldStyle)
{
    // FIXME: This will be slow when a large number of images is used.  Fix by using a dict.
    const BackgroundLayer* oldLayers = oldStyle ? oldStyle->backgroundLayers() : 0;
    const BackgroundLayer* newLayers = m_style ? m_style->backgroundLayers() : 0;
    for (const BackgroundLayer* currOld = oldLayers; currOld; currOld = currOld->next()) {
        if (currOld->backgroundImage() && (!newLayers || !newLayers->containsImage(currOld->backgroundImage())))
            currOld->backgroundImage()->deref(this);
    }
    for (const BackgroundLayer* currNew = newLayers; currNew; currNew = currNew->next()) {
        if (currNew->backgroundImage() && (!oldLayers || !oldLayers->containsImage(currNew->backgroundImage())))
            currNew->backgroundImage()->ref(this);
    }
}

QRect RenderObject::viewRect() const
{
    return containingBlock()->viewRect();
}

bool RenderObject::absolutePosition(int &xPos, int &yPos, bool f)
{
    RenderObject* p = parent();
    if(p) {
        parent()->absolutePosition(xPos, yPos, f);
        if ( p->style()->hidesOverflow() && p->layer() )
            p->layer()->subtractScrollOffset( xPos, yPos );
        return true;
    }
    else
    {
        xPos = yPos = 0;
        return false;
    }
}

void RenderObject::caretPos(int /*offset*/, int /*flags*/, int &_x, int &_y, int &width, int &height)
{
    _x = _y = height = -1;
    width = 1;        // the caret has a default width of one pixel. If you want
                    // to check for validity, only test the x-coordinate for >= 0.
}

int RenderObject::paddingTop() const
{
    int w = 0;
    Length padding = m_style->paddingTop();
    if (padding.isPercent())
        w = containingBlock()->contentWidth();
    w = padding.minWidth(w);
    if ( isTableCell() && padding.isVariable() )
        w = static_cast<const RenderTableCell *>(this)->table()->cellPadding();
    return w;
}

int RenderObject::paddingBottom() const
{
    int w = 0;
    Length padding = style()->paddingBottom();
    if (padding.isPercent())
        w = containingBlock()->contentWidth();
    w = padding.minWidth(w);
    if ( isTableCell() && padding.isVariable() )
        w = static_cast<const RenderTableCell *>(this)->table()->cellPadding();
    return w;
}

int RenderObject::paddingLeft() const
{
    int w = 0;
    Length padding = style()->paddingLeft();
    if (padding.isPercent())
        w = containingBlock()->contentWidth();
    w = padding.minWidth(w);
    if ( isTableCell() && padding.isVariable() )
        w = static_cast<const RenderTableCell *>(this)->table()->cellPadding();
    return w;
}

int RenderObject::paddingRight() const
{
    int w = 0;
    Length padding = style()->paddingRight();
    if (padding.isPercent())
        w = containingBlock()->contentWidth();
    w = padding.minWidth(w);
    if ( isTableCell() && padding.isVariable() )
        w = static_cast<const RenderTableCell *>(this)->table()->cellPadding();
    return w;
}

RenderObject *RenderObject::container() const
{
    // This method is extremely similar to containingBlock(), but with a few notable
    // exceptions.
    // (1) It can be used on orphaned subtrees, i.e., it can be called safely even when
    // the object is not part of the primary document subtree yet.
    // (2) For normal flow elements, it just returns the parent.
    // (3) For absolute positioned elements, it will return a relative positioned inline.
    // containingBlock() simply skips relpositioned inlines and lets an enclosing block handle
    // the layout of the positioned object.  This does mean that calcAbsoluteHorizontal and
    // calcAbsoluteVertical have to use container().
    EPosition pos = m_style->position();
    RenderObject *o = 0;
    if( pos == FIXED ) {
        // container() can be called on an object that is not in the
        // tree yet.  We don't call canvas() since it will assert if it
        // can't get back to the canvas.  Instead we just walk as high up
        // as we can.  If we're in the tree, we'll get the root.  If we
        // aren't we'll get the root of our little subtree (most likely
        // we'll just return 0).
        o = parent();
        while ( o && o->parent() ) o = o->parent();
    }
    else if ( pos == ABSOLUTE ) {
        // Same goes here.  We technically just want our containing block, but
        // we may not have one if we're part of an uninstalled subtree.  We'll
        // climb as high as we can though.
        o = parent();
        while (o && o->style()->position() == STATIC && !o->isCanvas())
            o = o->parent();
    }
    else
        o = parent();
    return o;
}

DOM::DocumentImpl* RenderObject::document() const
{
    return m_node->getDocument();
}

void RenderObject::remove()
{
    removeFromObjectLists();

    if ( parent() )
        //have parent, take care of the tree integrity
        parent()->removeChild(this);
}

void RenderObject::removeFromObjectLists()
{
    // in destruction mode, don't care.
    if ( !document()->renderer() ) return;

    if (isFloating()) {
        RenderBlock* outermostBlock = containingBlock();
        for (RenderBlock* p = outermostBlock; p && !p->isCanvas() && p->containsFloat(this);) {
            outermostBlock = p;
            if (p->isFloatingOrPositioned())
                break;
            p = p->containingBlock();
        }

        if (outermostBlock)
            outermostBlock->markAllDescendantsWithFloatsForLayout(this);
    }

    if (isPositioned()) {
        RenderObject *p;
        for (p = parent(); p; p = p->parent()) {
            if (p->isRenderBlock())
                static_cast<RenderBlock*>(p)->removePositionedObject(this);
        }
    }
}

RenderArena* RenderObject::renderArena() const
{
    return m_node->getDocument()->renderArena();
}

void RenderObject::detach()
{
    detachCounters();

    deleteInlineBoxes();
    remove();

    // by default no refcounting
    arenaDelete(renderArena(), this);
}

void RenderObject::arenaDelete(RenderArena *arena, void *base)
{
#ifndef NDEBUG
    void *savedBase = baseOfRenderObjectBeingDeleted;
    baseOfRenderObjectBeingDeleted = base;
#endif
    delete this;
#ifndef NDEBUG
    baseOfRenderObjectBeingDeleted = savedBase;
#endif

    // Recover the size left there for us by operator delete and free the memory.
    arena->free(*(size_t *)base, base);
}

void RenderObject::arenaDelete(RenderArena *arena)
{
    // static_cast unfortunately doesn't work, since we multiple inherit
    // in eg. RenderWidget.
    arenaDelete(arena, dynamic_cast<void *>(this));
}

FindSelectionResult RenderObject::checkSelectionPoint( int _x, int _y, int _tx, int _ty, DOM::NodeImpl*& node, int & offset, SelPointState &state )
{
#if 0
    NodeInfo info(true, false);
    if ( nodeAtPoint( info, _x, _y, _tx, _ty ) && info.innerNode() )
    {
        RenderObject* r = info.innerNode()->renderer();
        if ( r ) {
            if ( r == this ) {
                node = info.innerNode();
                offset = 0; // we have no text...
                return SelectionPointInside;
            }
            else
                return r->checkSelectionPoint( _x, _y, _tx, _ty, node, offset, state );
        }
    }
    //kdDebug(6030) << "nodeAtPoint Failed. Fallback - hmm, SelectionPointAfter" << endl;
    node = 0;
    offset = 0;
    return SelectionPointAfter;
#endif
    int off = offset;
    DOM::NodeImpl* nod = node;

    for (RenderObject *child = firstChild(); child; child=child->nextSibling()) {
        // ignore empty text boxes, they produce totally bogus information
        // for caret navigation (LS)
        if (child->isText() && !static_cast<RenderText *>(child)->inlineTextBoxCount())
            continue;

//        kdDebug(6040) << "iterating " << (child ? child->renderName() : "") << "@" << child << (child->isText() ? " contains: \"" + QConstString(static_cast<RenderText *>(child)->text(), kMin(static_cast<RenderText *>(child)->length(), 10u)).string() + "\"" : QString::null) << endl;
//        kdDebug(6040) << "---------- checkSelectionPoint recursive -----------" << endl;
        khtml::FindSelectionResult pos = child->checkSelectionPoint(_x, _y, _tx+xPos(), _ty+yPos(), nod, off, state);
//        kdDebug(6040) << "-------- end checkSelectionPoint recursive ---------" << endl;
//        kdDebug(6030) << this << " child->findSelectionNode returned result=" << pos << " nod=" << nod << " off=" << off << endl;
        switch(pos) {
        case SelectionPointBeforeInLine:
        case SelectionPointInside:
            //kdDebug(6030) << "RenderObject::checkSelectionPoint " << this << " returning SelectionPointInside offset=" << offset << endl;
            node = nod;
            offset = off;
            return SelectionPointInside;
        case SelectionPointBefore:
            //x,y is before this element -> stop here