render_line.cpp

khtml在gtk上的移植版本

                                              bg, my, mh, _tx, _ty, w, h,
                                              borderLeft(), borderRight());
        else {
            // We have a background image that spans multiple lines.
            // We need to adjust _tx and _ty by the width of all previous lines.
            // Think of background painting on inlines as though you had one long line, a single continuous
            // strip.  Even though that strip has been broken up across multiple lines, you still paint it
            // as though you had one single line.  This means each line has to pick up the background where
            // the previous line left off.
            int startX = _tx - xOffsetOnLine;
            int totalWidth = xOffsetOnLine;
            for (InlineRunBox* curr = this; curr; curr = curr->nextLineBox())
                totalWidth += curr->width();
            QRect clipRect(_tx, _ty, width(), height());
            clipRect = p->xForm(clipRect);
            p->save();
            p->addClip(clipRect);
            object()->paintBackgroundExtended(p, object()->style()->backgroundColor(),
                                              object()->style()->backgroundImage(), my, mh, startX, _ty,
                                              totalWidth, h,
                                              borderLeft(), borderRight());
            p->restore();
        }

        // :first-line cannot be used to put borders on a line. Always paint borders with our
        // non-first-line style.
        if (parent() && object()->style()->hasBorder())
            object()->paintBorder(p, _tx, _ty, w, h, object()->style(), includeLeftEdge(), includeRightEdge());
    }
}

static bool shouldDrawDecoration(RenderObject* obj)
{
    bool shouldDraw = false;
    for (RenderObject* curr = obj->firstChild();
         curr; curr = curr->nextSibling()) {
        if (curr->isInlineFlow()) {
            shouldDraw = true;
            break;
        }
        else if (curr->isText() && !curr->isBR() && (curr->style()->whiteSpace() == PRE ||
                 !curr->element() || !curr->element()->containsOnlyWhitespace())) {
            shouldDraw = true;
            break;
        }	
    }
    return shouldDraw;
}

void InlineFlowBox::paintDecorations(RenderObject::PaintInfo& i, int _tx, int _ty, bool paintedChildren)
{
    // Now paint our text decorations. We only do this if we aren't in quirks mode (i.e., in
    // almost-strict mode or strict mode).
    QPainter* p = i.p;
    _tx += m_x;
    _ty += m_y;
    RenderStyle* styleToUse = object()->style(m_firstLine);
    int deco = parent() ? styleToUse->textDecoration() : styleToUse->textDecorationsInEffect();
    if (deco != TDNONE && 
        ((!paintedChildren && ((deco & UNDERLINE) || (deco & OVERLINE))) || (paintedChildren && (deco & LINE_THROUGH))) &&
        shouldDrawDecoration(object())) {
        int x = m_x + borderLeft() + paddingLeft();
        int w = m_width - (borderLeft() + paddingLeft() + borderRight() + paddingRight());
        RootInlineBox* rootLine = root();
        if (rootLine->ellipsisBox()) {
            int ellipsisX = rootLine->ellipsisBox()->xPos();
            int ellipsisWidth = rootLine->ellipsisBox()->width();
            
            // FIXME: Will need to work with RTL
            if (rootLine == this) {
                if (x + w >= ellipsisX + ellipsisWidth)
                    w -= (x + w - ellipsisX - ellipsisWidth);
            }
            else {
                if (x >= ellipsisX)
                    return;
                if (x + w >= ellipsisX)
                    w -= (x + w - ellipsisX);
            }
        }
            
#if APPLE_CHANGES
        // Set up the appropriate text-shadow effect for the decoration.
        // FIXME: Support multiple shadow effects.  Need more from the CG API before we can do this.
        bool setShadow = false;
        if (styleToUse->textShadow()) {
            p->setShadow(styleToUse->textShadow()->x, styleToUse->textShadow()->y,
                         styleToUse->textShadow()->blur, styleToUse->textShadow()->color);
            setShadow = true;
        }
#endif
        
        // We must have child boxes and have decorations defined.
        _tx += borderLeft() + paddingLeft();
        
        QColor underline, overline, linethrough;
        underline = overline = linethrough = styleToUse->color();
        if (!parent())
            object()->getTextDecorationColors(deco, underline, overline, linethrough);

        if (styleToUse->font() != p->font())
            p->setFont(styleToUse->font());

        if (deco & UNDERLINE && !paintedChildren) {
            p->setPen(underline);
            p->drawLineForText(_tx, _ty, m_baseline, w);
        }
        if (deco & OVERLINE && !paintedChildren) {
            p->setPen(overline);
            p->drawLineForText(_tx, _ty, 0, w);
        }
        if (deco & LINE_THROUGH && paintedChildren) {
            p->setPen(linethrough);
            p->drawLineForText(_tx, _ty, 2*m_baseline/3, w);
        }

#if APPLE_CHANGES
        if (setShadow)
            p->clearShadow();
#endif
    }
}

InlineBox* InlineFlowBox::firstLeafChild()
{
    InlineBox *box = firstChild();
    while (box) {
        InlineBox* next = 0;
        if (!box->isInlineFlowBox())
            break;
        next = static_cast<InlineFlowBox*>(box)->firstChild();
        if (!next)
            break;
        box = next;
    }
    return box;
}

InlineBox* InlineFlowBox::lastLeafChild()
{
    InlineBox *box = lastChild();
    while (box) {
        InlineBox* next = 0;
        if (!box->isInlineFlowBox())
            break;
        next = static_cast<InlineFlowBox*>(box)->lastChild();
        if (!next)
            break;
        box = next;
    }
    return box;
}

InlineBox* InlineFlowBox::closestChildForXPos(int _x, int _tx)
{
    if (_x < _tx + firstChild()->m_x)
        // if the x coordinate is to the left of the first child
        return firstChild(); 
    else if (_x >= _tx + lastChild()->m_x + lastChild()->m_width)
        // if the x coordinate is to the right of the last child
        return lastChild(); 
    else
        // look for the closest child;
        // check only the right edges, since the left edge of the first
        // box has already been checked
        for (InlineBox *box = firstChild(); box; box = box->nextOnLine())
            if (_x < _tx + box->m_x + box->m_width)
                return box;

    return 0;
}

bool InlineFlowBox::canAccommodateEllipsis(bool ltr, int blockEdge, int ellipsisWidth)
{
    for (InlineBox *box = firstChild(); box; box = box->nextOnLine()) {
        if (!box->canAccommodateEllipsis(ltr, blockEdge, ellipsisWidth))
            return false;
    }
    return true;
}

int InlineFlowBox::placeEllipsisBox(bool ltr, int blockEdge, int ellipsisWidth, bool& foundBox)
{
    int result = -1;
    for (InlineBox *box = firstChild(); box; box = box->nextOnLine()) {
        int currResult = box->placeEllipsisBox(ltr, blockEdge, ellipsisWidth, foundBox);
        if (currResult != -1 && result == -1)
            result = currResult;
    }
    return result;
}

void InlineFlowBox::clearTruncation()
{
    for (InlineBox *box = firstChild(); box; box = box->nextOnLine())
        box->clearTruncation();
}

void EllipsisBox::paint(RenderObject::PaintInfo& i, int _tx, int _ty)
{
    QPainter* p = i.p;
    RenderStyle* _style = m_firstLine ? m_object->style(true) : m_object->style();
    if (_style->font() != p->font())
        p->setFont(_style->font());

    const Font* font = &_style->htmlFont();
    QColor textColor = _style->color();
    if (textColor != p->pen().color())
        p->setPen(textColor);
    bool setShadow = false;
    if (_style->textShadow()) {
        p->setShadow(_style->textShadow()->x, _style->textShadow()->y,
                     _style->textShadow()->blur, _style->textShadow()->color);
        setShadow = true;
    }
    
    const DOMString& str = m_str.string();
    font->drawText(p, m_x + _tx, 
                      m_y + _ty + m_baseline,
                      (str.implementation())->s,
                      str.length(), 0, str.length(),
                      0, 
                      QPainter::LTR, _style->visuallyOrdered());
                      
    if (setShadow)
        p->clearShadow();
    
    if (m_markupBox) {
        // Paint the markup box
        _tx += m_x + m_width - m_markupBox->xPos();
        _ty += m_y + m_baseline - (m_markupBox->yPos() + m_markupBox->baseline());
        m_markupBox->object()->paint(i, _tx, _ty);
    }
}

bool EllipsisBox::nodeAtPoint(RenderObject::NodeInfo& info, int _x, int _y, int _tx, int _ty,
                              HitTestAction hitTestAction, bool inBox)
{
    if (m_markupBox) {
        _tx += m_x + m_width - m_markupBox->xPos();
        _ty += m_y + m_baseline - (m_markupBox->yPos() + m_markupBox->baseline());
        inBox |= m_markupBox->object()->nodeAtPoint(info, _x, _y, _tx, _ty, hitTestAction, inBox);
    }
    
    return inBox;
}

void RootInlineBox::detach(RenderArena* arena)
{
    detachEllipsisBox(arena);
    InlineFlowBox::detach(arena);
}

void RootInlineBox::detachEllipsisBox(RenderArena* arena)
{
    if (m_ellipsisBox) {
        m_ellipsisBox->detach(arena);
        m_ellipsisBox = 0;
    }
}

void RootInlineBox::clearTruncation()
{
    if (m_ellipsisBox) {
        detachEllipsisBox(m_object->renderArena());
        InlineFlowBox::clearTruncation();
    }
}

bool RootInlineBox::canAccommodateEllipsis(bool ltr, int blockEdge, int lineBoxEdge, int ellipsisWidth)
{
    // First sanity-check the unoverflowed width of the whole line to see if there is sufficient room.
    int delta = ltr ? lineBoxEdge - blockEdge : blockEdge - lineBoxEdge;
    if (width() - delta < ellipsisWidth)
        return false;

    // Next iterate over all the line boxes on the line.  If we find a replaced element that intersects
    // then we refuse to accommodate the ellipsis.  Otherwise we're ok.
    return InlineFlowBox::canAccommodateEllipsis(ltr, blockEdge, ellipsisWidth);
}

void RootInlineBox::placeEllipsis(const AtomicString& ellipsisStr,  bool ltr, int blockEdge, int ellipsisWidth,
                                  InlineBox* markupBox)
{
    // Create an ellipsis box.
    m_ellipsisBox = new (m_object->renderArena()) EllipsisBox(m_object, ellipsisStr, this, 
                                                              ellipsisWidth - (markupBox ? markupBox->width() : 0),
                                                              yPos(), height(), baseline(), !prevRootBox(),
                                                              markupBox);

    if (ltr && (xPos() + width() + ellipsisWidth) <= blockEdge) {
        m_ellipsisBox->m_x = xPos() + width();
        return;
    }

    // Now attempt to find the nearest glyph horizontally and place just to the right (or left in RTL)
    // of that glyph.  Mark all of the objects that intersect the ellipsis box as not painting (as being
    // truncated).
    bool foundBox = false;
    m_ellipsisBox->m_x = placeEllipsisBox(ltr, blockEdge, ellipsisWidth, foundBox);
}

int RootInlineBox::placeEllipsisBox(bool ltr, int blockEdge, int ellipsisWidth, bool& foundBox)
{
    int result = InlineFlowBox::placeEllipsisBox(ltr, blockEdge, ellipsisWidth, foundBox);
    if (result == -1)
        result = ltr ? blockEdge - ellipsisWidth : blockEdge;
    return result;
}

void RootInlineBox::paintEllipsisBox(RenderObject::PaintInfo& i, int _tx, int _ty) const
{
    if (m_ellipsisBox)
        m_ellipsisBox->paint(i, _tx, _ty);
}

bool RootInlineBox::hitTestEllipsisBox(RenderObject::NodeInfo& info, int _x, int _y, int _tx, int _ty,
                                       HitTestAction hitTestAction, bool inBox)
{
    if (m_ellipsisBox)
        inBox |= m_ellipsisBox->nodeAtPoint(info, _x, _y, _tx, _ty, hitTestAction, inBox);
    return inBox;
}

void RootInlineBox::adjustPosition(int dx, int dy)
{
    InlineFlowBox::adjustPosition(dx, dy);
    m_topOverflow += dy;
    m_bottomOverflow += dy;
    m_blockHeight += dy;
}

void RootInlineBox::childRemoved(InlineBox* box)
{
    if (box->object() == m_lineBreakObj)
        setLineBreakInfo(0,0);

    RootInlineBox* prev = prevRootBox();
    if (prev && prev->lineBreakObj() == box->object()) {
        prev->setLineBreakInfo(0,0);
        prev->markDirty();
    }
}

}