C++ InlineBox::isInlineFlowBox方法代码示例

void SVGRootInlineBox::layoutCharactersInTextBoxes(InlineFlowBox* start, SVGTextLayoutEngine& characterLayout)
{
    for (InlineBox* child = start->firstChild(); child; child = child->nextOnLine()) {
        if (child->isSVGInlineTextBox()) {
            ASSERT(child->renderer().isSVGInlineText());

            SVGInlineTextBox* textBox = toSVGInlineTextBox(child);
            characterLayout.layoutInlineTextBox(textBox);
        } else {
            // Skip generated content.
            Node* node = child->renderer().node();
            if (!node)
                continue;

            ASSERT_WITH_SECURITY_IMPLICATION(child->isInlineFlowBox());

            SVGInlineFlowBox* flowBox = toSVGInlineFlowBox(child);
            bool isTextPath = node->hasTagName(SVGNames::textPathTag);
            if (isTextPath) {
                // Build text chunks for all <textPath> children, using the line layout algorithm.
                // This is needeed as text-anchor is just an additional startOffset for text paths.
                SVGTextLayoutEngine lineLayout(characterLayout.layoutAttributes());
                layoutCharactersInTextBoxes(flowBox, lineLayout);

                characterLayout.beginTextPathLayout(&child->renderer(), lineLayout);
            }

            layoutCharactersInTextBoxes(flowBox, characterLayout);

            if (isTextPath)
                characterLayout.endTextPathLayout();
        }
    }
}

void SVGRootInlineBox::layoutChildBoxes(InlineFlowBox* start, FloatRect* childRect)
{
    for (InlineBox* child = start->firstChild(); child; child = child->nextOnLine()) {
        FloatRect boxRect;
        if (child->isSVGInlineTextBox()) {
            ASSERT(child->renderer().isSVGInlineText());

            SVGInlineTextBox* textBox = toSVGInlineTextBox(child);
            boxRect = textBox->calculateBoundaries();
            textBox->setX(boxRect.x());
            textBox->setY(boxRect.y());
            textBox->setLogicalWidth(boxRect.width());
            textBox->setLogicalHeight(boxRect.height());
        } else {
            // Skip generated content.
            if (!child->renderer().node())
                continue;

            ASSERT_WITH_SECURITY_IMPLICATION(child->isInlineFlowBox());

            SVGInlineFlowBox* flowBox = toSVGInlineFlowBox(child);
            layoutChildBoxes(flowBox);

            boxRect = flowBox->calculateBoundaries();
            flowBox->setX(boxRect.x());
            flowBox->setY(boxRect.y());
            flowBox->setLogicalWidth(boxRect.width());
            flowBox->setLogicalHeight(boxRect.height());
        }
        if (childRect)
            childRect->unite(boxRect);
    }
}

void InlineFlowBox::adjustMaxAscentAndDescent(int& maxAscent, int& maxDescent,
                                              int maxPositionTop, int maxPositionBottom)
{
    for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
        // The computed lineheight needs to be extended for the
        // positioned elements
        // see khtmltests/rendering/html_align.html

        if (curr->object()->isPositioned())
            continue; // Positioned placeholders don't affect calculations.
        if (curr->yPos() == PositionTop || curr->yPos() == PositionBottom) {
            if (curr->yPos() == PositionTop) {
                if (maxAscent + maxDescent < curr->height())
                    maxDescent = curr->height() - maxAscent;
            }
            else {
                if (maxAscent + maxDescent < curr->height())
                    maxAscent = curr->height() - maxDescent;
            }

            if ( maxAscent + maxDescent >= kMax( maxPositionTop, maxPositionBottom ) )
                break;
        }

        if (curr->isInlineFlowBox())
            static_cast<InlineFlowBox*>(curr)->adjustMaxAscentAndDescent(maxAscent, maxDescent, maxPositionTop, maxPositionBottom);
    }
}

static void placeBoxesVerticallyWithAbsBaseline(InlineFlowBox* flow, int& heightOfBlock, int& minY, int& maxY, int& baseline, int yPos)
{
    for (InlineBox* curr = flow->firstChild(); curr; curr = curr->nextOnLine()) {
        if (curr->isInlineFlowBox() && !curr->object()->element()->hasTagName(aTag)) {
            SVGTextPositioningElement* text = static_cast<SVGTextPositioningElement*>(curr->object()->element());
            baseline += (int)(text->dy()->getFirst().value());

            if (text->y()->numberOfItems() > 0)
                baseline = (int)(text->y()->getFirst().value() - yPos);

            placeBoxesVerticallyWithAbsBaseline(static_cast<InlineFlowBox*>(curr), heightOfBlock, minY, maxY, baseline, yPos);
        }
        const Font& font = curr->object()->firstLineStyle()->font(); // FIXME: Is it right to always use firstLineStyle here?
        int ascent = font.ascent();
        int position = baseline - ascent;
        int height = ascent + font.descent();
        curr->setBaseline(ascent);
        curr->setYPos(position);
        curr->setHeight(height);

        if (position < minY)
            minY = position;
        if (position + height > maxY)
            maxY = position + height;
    }

    if (flow->isRootInlineBox()) {
        flow->setYPos(minY);
        flow->setHeight(maxY - minY);
        flow->setBaseline(baseline - minY);
        heightOfBlock += maxY - minY;
    }
}

void SVGRootInlineBox::layoutChildBoxes(InlineFlowBox* start)
{
    for (InlineBox* child = start->firstChild(); child; child = child->nextOnLine()) {
        if (child->isSVGInlineTextBox()) {
            ASSERT(child->renderer());
            ASSERT(child->renderer()->isSVGInlineText());

            SVGInlineTextBox* textBox = static_cast<SVGInlineTextBox*>(child);
            IntRect boxRect = textBox->calculateBoundaries();
            textBox->setX(boxRect.x());
            textBox->setY(boxRect.y());
            textBox->setLogicalWidth(boxRect.width());
            textBox->setLogicalHeight(boxRect.height());
        } else {
            ASSERT(child->isInlineFlowBox());

            // Skip generated content.
            if (!child->renderer()->node())
                continue;

            SVGInlineFlowBox* flowBox = static_cast<SVGInlineFlowBox*>(child);
            layoutChildBoxes(flowBox);

            IntRect boxRect = flowBox->calculateBoundaries();
            flowBox->setX(boxRect.x());
            flowBox->setY(boxRect.y());
            flowBox->setLogicalWidth(boxRect.width());
            flowBox->setLogicalHeight(boxRect.height());
        }
    }
}

void InlineFlowBox::determineSpacingForFlowBoxes(bool lastLine, RenderObject* endObject)
{
    // All boxes start off open.  They will not apply any margins/border/padding on
    // any side.
    bool includeLeftEdge = false;
    bool includeRightEdge = false;

    RenderFlow* flow = static_cast<RenderFlow*>(object());

    if (!flow->firstChild())
        includeLeftEdge = includeRightEdge = true; // Empty inlines never split across lines.
    else if (parent()) { // The root inline box never has borders/margins/padding.
        bool ltr = flow->style()->direction() == LTR;

        // Check to see if all initial lines are unconstructed.  If so, then
        // we know the inline began on this line.
        if (!flow->firstLineBox()->isConstructed()) {
            if (ltr && flow->firstLineBox() == this)
                includeLeftEdge = true;
            else if (!ltr && flow->lastLineBox() == this)
                includeRightEdge = true;
        }

        // In order to determine if the inline ends on this line, we check three things:
        // (1) If we are the last line and we don't have a continuation(), then we can
        // close up.
        // (2) If the last line box for the flow has an object following it on the line (ltr,
        // reverse for rtl), then the inline has closed.
        // (3) The line may end on the inline.  If we are the last child (climbing up
        // the end object's chain), then we just closed as well.
        if (!flow->lastLineBox()->isConstructed()) {
            if (ltr) {
                if (!nextLineBox() &&
                    ((lastLine && !object()->continuation()) || nextOnLineExists()
                     || onEndChain(endObject)))
                    includeRightEdge = true;
            }
            else {
                if ((!prevLineBox() || !prevLineBox()->isConstructed()) &&
                    ((lastLine && !object()->continuation()) ||
                     prevOnLineExists() || onEndChain(endObject)))
                    includeLeftEdge = true;
            }

        }
    }

    setEdges(includeLeftEdge, includeRightEdge);

    // Recur into our children.
    for (InlineBox* currChild = firstChild(); currChild; currChild = currChild->nextOnLine()) {
        if (currChild->isInlineFlowBox()) {
            InlineFlowBox* currFlow = static_cast<InlineFlowBox*>(currChild);
            currFlow->determineSpacingForFlowBoxes(lastLine, endObject);
        }
    }
}

int InlineFlowBox::getFlowSpacingWidth() const
{
    int totWidth = marginBorderPaddingLeft() + marginBorderPaddingRight();
    for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
        if (curr->isInlineFlowBox())
            totWidth += static_cast<InlineFlowBox*>(curr)->getFlowSpacingWidth();
    }
    return totWidth;
}

static void invalidateLineBoxPaintOffsetsInternal(PaintController& paintController, InlineFlowBox* inlineBox)
{
    paintController.invalidatePaintOffset(*inlineBox);
    for (InlineBox* child = inlineBox->firstChild(); child; child = child->nextOnLine()) {
        if (!child->lineLayoutItem().isText() && child->boxModelObject().hasSelfPaintingLayer())
            continue;
        if (child->isInlineFlowBox())
            invalidateLineBoxPaintOffsetsInternal(paintController, toInlineFlowBox(child));
        else
            paintController.invalidatePaintOffset(*child);
    }
}

void InlineFlowBox::computeLogicalBoxHeights(int& maxPositionTop, int& maxPositionBottom,
                                             int& maxAscent, int& maxDescent, bool strictMode)
{
    if (isRootInlineBox()) {
        // Examine our root box.
        setHeight(object()->lineHeight(m_firstLine));
        bool isTableCell = object()->isTableCell();
        if (isTableCell) {
            RenderTableCell* tableCell = static_cast<RenderTableCell*>(object());
            setBaseline(tableCell->RenderBlock::baselinePosition(m_firstLine));
        }
        else
            setBaseline(object()->baselinePosition(m_firstLine));
        if (hasTextChildren() || strictMode) {
            int ascent = baseline();
            int descent = height() - ascent;
            if (maxAscent < ascent)
                maxAscent = ascent;
            if (maxDescent < descent)
                maxDescent = descent;
        }
    }

    for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
        if (curr->object()->isPositioned())
            continue; // Positioned placeholders don't affect calculations.

        curr->setHeight(curr->object()->lineHeight(m_firstLine));
        curr->setBaseline(curr->object()->baselinePosition(m_firstLine));
        curr->setYPos(curr->object()->verticalPositionHint(m_firstLine));
        if (curr->yPos() == PositionTop) {
            if (maxPositionTop < curr->height())
                maxPositionTop = curr->height();
        }
        else if (curr->yPos() == PositionBottom) {
            if (maxPositionBottom < curr->height())
                maxPositionBottom = curr->height();
        }
        else if (curr->hasTextChildren() || strictMode) {
            int ascent = curr->baseline() - curr->yPos();
            int descent = curr->height() - ascent;
            if (maxAscent < ascent)
                maxAscent = ascent;
            if (maxDescent < descent)
                maxDescent = descent;
        }

        if (curr->isInlineFlowBox())
            static_cast<InlineFlowBox*>(curr)->computeLogicalBoxHeights(maxPositionTop, maxPositionBottom, maxAscent, maxDescent, strictMode);
    }
}

void SVGTextQuery::collectTextBoxesInFlowBox(InlineFlowBox* flowBox)
{
    if (!flowBox)
        return;

    for (InlineBox* child = flowBox->firstChild(); child; child = child->nextOnLine()) {
        if (child->isInlineFlowBox()) {
            // Skip generated content.
            if (!child->renderer()->node())
                continue;

            collectTextBoxesInFlowBox(toInlineFlowBox(child));
            continue;
        }

        if (child->isSVGInlineTextBox())
            m_textBoxes.append(toSVGInlineTextBox(child));
    }
}

static void collectTextBoxesInFlowBox(InlineFlowBox* flowBox, Vector<SVGInlineTextBox*>& textBoxes)
{
    if (!flowBox)
        return;

    for (InlineBox* child = flowBox->firstChild(); child; child = child->nextOnLine()) {
        if (child->isInlineFlowBox()) {
            // Skip generated content.
            if (!child->layoutObject().node())
                continue;

            collectTextBoxesInFlowBox(toInlineFlowBox(child), textBoxes);
            continue;
        }

        if (child->isSVGInlineTextBox())
            textBoxes.append(toSVGInlineTextBox(child));
    }
}

void InlineFlowBox::shrinkBoxesWithNoTextChildren(int topPos, int bottomPos)
{
    // First shrink our kids.
    for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
        if (curr->object()->isPositioned())
            continue; // Positioned placeholders don't affect calculations.

        if (curr->isInlineFlowBox())
            static_cast<InlineFlowBox*>(curr)->shrinkBoxesWithNoTextChildren(topPos, bottomPos);
    }

    // See if we have text children. If not, then we need to shrink ourselves to fit on the line.
    if (!hasTextDescendant()) {
        if (yPos() < topPos)
            setYPos(topPos);
        if (yPos() + height() > bottomPos)
            setHeight(bottomPos - yPos());
        if (baseline() > height())
            setBaseline(height());
    }
}

//.........这里部分代码省略.........
                        fprintf(stderr, " | -> Record last chunk of inline text box!\n");
#endif

                        startTextChunk();
                        SVGInlineBoxCharacterRange& range = m_chunk.boxes.last();

                        m_assignChunkProperties = false;
                        m_chunk.isVerticalText = isVerticalWritingMode(text->style()->svgStyle());
                        m_chunk.isTextPath = m_handlingTextPath;
                        m_chunk.anchor = text->style()->svgStyle()->textAnchor();
                        m_chunk.textLength = textContent->textLength().value(textContent);
                        m_chunk.lengthAdjust = (ELengthAdjust) textContent->lengthAdjust();

                        range.box = curr;
                        range.startOffset = i;

                        ASSERT(!range.isOpen());
                        ASSERT(!range.isClosed());
                    }
                }

                // This should only hold true for the first character of the first chunk
                if (isFirstCharacter)
                    isFirstCharacter = false;
    
                ++m_charsIt;
            }

#if DEBUG_CHUNK_BUILDING > 1    
            fprintf(stderr, " -> Finished inline text box!\n");
#endif

            SVGInlineBoxCharacterRange& range = m_chunk.boxes.last();
            if (!range.isOpen() && !range.isClosed()) {
#if DEBUG_CHUNK_BUILDING > 1
                fprintf(stderr, " -> Last range not closed - closing with endOffset: %i\n", length);
#endif

                // Current text chunk is not yet closed. Finish the current range, but don't start a new chunk.
                range.endOffset = length;

                if (m_charsIt != m_charsEnd) {
#if DEBUG_CHUNK_BUILDING > 1
                    fprintf(stderr, " -> Not at last character yet!\n");
#endif

                    // If we're not at the end of the last box to be processed, and if the next
                    // character starts a new chunk, then close the current chunk and start a new one.
                    if (m_charsIt->newTextChunk) {
#if DEBUG_CHUNK_BUILDING > 1
                        fprintf(stderr, " -> Next character starts new chunk! Closing current chunk, and starting a new one...\n");
#endif

                        closeTextChunk();
                        startTextChunk();
                    } else {
                        // Just start a new character range
                        m_chunk.boxes.append(SVGInlineBoxCharacterRange());

#if DEBUG_CHUNK_BUILDING > 1
                        fprintf(stderr, " -> Next character does NOT start a new chunk! Starting new character range...\n");
#endif
                    }
                } else {
#if DEBUG_CHUNK_BUILDING > 1
                    fprintf(stderr, " -> Closing final chunk! Finished processing!\n");
#endif

                    // Close final chunk, once we're at the end of the last box
                    closeTextChunk();
                }
            }
        } else {
            ASSERT(curr->isInlineFlowBox());
            InlineFlowBox* flowBox = static_cast<InlineFlowBox*>(curr);

            // Skip generated content.
            if (!flowBox->renderer()->node())
                continue;

            bool isTextPath = flowBox->renderer()->node()->hasTagName(SVGNames::textPathTag);

#if DEBUG_CHUNK_BUILDING > 1
            fprintf(stderr, " -> Handle inline flow box (%p), isTextPath=%i\n", flowBox, (int) isTextPath);
#endif

            if (isTextPath)
                m_handlingTextPath = true;

            recursiveBuildTextChunks(flowBox);

            if (isTextPath)
                m_handlingTextPath = false;
        }
    }

#if DEBUG_CHUNK_BUILDING > 1
    fprintf(stderr, " <- buildTextChunks(start=%p)\n", start);
#endif
}

void InlineFlowBox::placeBoxesVertically(int y, int maxHeight, int maxAscent, bool strictMode,
                                         int& topPosition, int& bottomPosition)
{
    if (isRootInlineBox()) {
        setYPos(y + maxAscent - baseline());// Place our root box.
        // CSS2: 10.8.1 - line-height on the block level element specifies the *minimum*
        // height of the generated line box
        if (hasTextChildren() && maxHeight < object()->lineHeight(m_firstLine))
            maxHeight = object()->lineHeight(m_firstLine);
    }

    for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
        if (curr->object()->isPositioned())
            continue; // Positioned placeholders don't affect calculations.

        // Adjust boxes to use their real box y/height and not the logical height (as dictated by
        // line-height).
        if (curr->isInlineFlowBox())
            static_cast<InlineFlowBox*>(curr)->placeBoxesVertically(y, maxHeight, maxAscent, strictMode,
                                                                    topPosition, bottomPosition);

        bool childAffectsTopBottomPos = true;

        if (curr->yPos() == PositionTop)
            curr->setYPos(y);
        else if (curr->yPos() == PositionBottom)
            curr->setYPos(y + maxHeight - curr->height());
        else {
            if (!strictMode && !curr->hasTextDescendant())
                childAffectsTopBottomPos = false;
            curr->setYPos(curr->yPos() + y + maxAscent - curr->baseline());
        }
        int newY = curr->yPos();
        int newHeight = curr->height();
        int newBaseline = curr->baseline();
        int overflowTop = 0;
        int overflowBottom = 0;
        if (curr->isInlineTextBox() || curr->isInlineFlowBox()) {
            const QFontMetrics &fm = curr->object()->fontMetrics( m_firstLine );
#ifdef APPLE_CHANGES
            newBaseline = fm.ascent();
            newY += curr->baseline() - newBaseline;
            newHeight = newBaseline+fm.descent();
#else
            // only adjust if the leading delta is superior to the font's natural leading
            if ( kAbs(fm.ascent() - curr->baseline()) > fm.leading()/2 ) {
                int ascent = fm.ascent()+fm.leading()/2;
                newBaseline = ascent;
                newY += curr->baseline() - newBaseline;
                newHeight = fm.lineSpacing();
            }
#endif
            for (ShadowData* shadow = curr->object()->style()->textShadow(); shadow; shadow = shadow->next) {
                overflowTop = kMin(overflowTop, shadow->y - shadow->blur);
                overflowBottom = kMax(overflowBottom, shadow->y + shadow->blur);
            }
            if (curr->isInlineFlowBox()) {
                newHeight += curr->object()->borderTop() + curr->object()->paddingTop() +
                            curr->object()->borderBottom() + curr->object()->paddingBottom();
                newY -= curr->object()->borderTop() + curr->object()->paddingTop();
                newBaseline += curr->object()->borderTop() + curr->object()->paddingTop();
            }
        } else {
            newY += curr->object()->marginTop();
            newHeight = curr->height() - (curr->object()->marginTop() + curr->object()->marginBottom());
            overflowTop = curr->object()->overflowTop();
            overflowBottom = curr->object()->overflowHeight() - newHeight;
       }
        curr->setYPos(newY);
        curr->setHeight(newHeight);
        curr->setBaseline(newBaseline);

        if (childAffectsTopBottomPos) {
            topPosition = kMin(topPosition, newY + overflowTop);
            bottomPosition = kMax(bottomPosition, newY + newHeight + overflowBottom);
        }
    }

    if (isRootInlineBox()) {
        const QFontMetrics &fm = object()->fontMetrics( m_firstLine );
#ifdef APPLE_CHANGES
        setHeight(fm.ascent()+fm.descent());
        setYPos(yPos() + baseline() - fm.ascent());
        setBaseline(fm.ascent());
#else
        if ( kAbs(fm.ascent() - baseline()) > fm.leading()/2 ) {
            int ascent = fm.ascent()+fm.leading()/2;
            setHeight(fm.lineSpacing());
            setYPos(yPos() + baseline() - ascent);
            setBaseline(ascent);
        }
#endif
        if (hasTextDescendant() || strictMode) {
            if (yPos() < topPosition)
                topPosition = yPos();
            if (yPos() + height() > bottomPosition)
                bottomPosition = yPos() + height();
        }
    }
}