C++ InlineFlowBox::root方法代码示例

bool RenderLineBoxList::hitTest(RenderBoxModelObject* renderer, const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty, HitTestAction hitTestAction) const
{
    if (hitTestAction != HitTestForeground)
        return false;

    ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could hit test like this is if it has a layer.

    // If we have no lines then we have no work to do.
    if (!firstLineBox())
        return false;

    // We can check the first box and last box and avoid hit testing if we don't
    // contain the point.  This is a quick short-circuit that we can take to avoid walking any lines.
    // FIXME: This check is flawed in the following extremely obscure way:
    // if some line in the middle has a huge overflow, it might actually extend below the last line.
    if ((y >= ty + lastLineBox()->root()->bottomVisibleOverflow()) || (y < ty + firstLineBox()->root()->topVisibleOverflow()))
        return false;

    // See if our root lines contain the point.  If so, then we hit test
    // them further.  Note that boxes can easily overlap, so we can't make any assumptions
    // based off positions of our first line box or our last line box.
    for (InlineFlowBox* curr = lastLineBox(); curr; curr = curr->prevLineBox()) {
        if (y >= ty + curr->root()->topVisibleOverflow() && y < ty + curr->root()->bottomVisibleOverflow()) {
            bool inside = curr->nodeAtPoint(request, result, x, y, tx, ty);
            if (inside) {
                renderer->updateHitTestResult(result, IntPoint(x - tx, y - ty));
                return true;
            }
        }
    }
    
    return false;
}

bool RenderFlow::hitTestLines(NodeInfo& i, int x, int y, int tx, int ty, HitTestAction hitTestAction)
{
   (void) hitTestAction;
   /*
    if (hitTestAction != HitTestForeground) // ### port hitTest
        return false;
   */

    if (!firstLineBox())
        return false;

    // We can check the first box and last box and avoid hit testing if we don't
    // contain the point.  This is a quick short-circuit that we can take to avoid walking any lines.
    // FIXME: This check is flawed in two extremely obscure ways.
    // (1) If some line in the middle has a huge overflow, it might actually extend below the last line.
    // (2) The overflow from an inline block on a line is not reported to the line.
    if ((y >= ty + lastLineBox()->root()->bottomOverflow()) || (y < ty + firstLineBox()->root()->topOverflow()))
        return false;

    // See if our root lines contain the point.  If so, then we hit test
    // them further.  Note that boxes can easily overlap, so we can't make any assumptions
    // based off positions of our first line box or our last line box.
    for (InlineFlowBox* curr = lastLineBox(); curr; curr = curr->prevFlowBox()) {
        if (y >= ty + curr->root()->topOverflow() && y < ty + curr->root()->bottomOverflow()) {
            bool inside = curr->nodeAtPoint(i, x, y, tx, ty);
            if (inside) {
                setInnerNode(i);
                return true;
            }
        }
    }

    return false;
}

bool LineBoxList::hitTest(LayoutBoxModelObject* renderer, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction) const
{
    if (hitTestAction != HitTestForeground)
        return false;

    ASSERT(renderer->isLayoutBlock() || (renderer->isLayoutInline() && renderer->hasLayer())); // The only way an inline could hit test like this is if it has a layer.

    // If we have no lines then we have no work to do.
    if (!firstLineBox())
        return false;

    LayoutPoint point = locationInContainer.point();
    LayoutRect rect(firstLineBox()->isHorizontal() ?
                    IntRect(point.x(), point.y() - locationInContainer.topPadding(), 1, locationInContainer.topPadding() + locationInContainer.bottomPadding() + 1) :
                    IntRect(point.x() - locationInContainer.leftPadding(), point.y(), locationInContainer.rightPadding() + locationInContainer.leftPadding() + 1, 1));

    if (!anyLineIntersectsRect(renderer, rect, accumulatedOffset))
        return false;

    // See if our root lines contain the point.  If so, then we hit test
    // them further.  Note that boxes can easily overlap, so we can't make any assumptions
    // based off positions of our first line box or our last line box.
    for (InlineFlowBox* curr = lastLineBox(); curr; curr = curr->prevLineBox()) {
        RootInlineBox& root = curr->root();
        if (rangeIntersectsRect(renderer, curr->logicalTopVisualOverflow(root.lineTop()), curr->logicalBottomVisualOverflow(root.lineBottom()), rect, accumulatedOffset)) {
            bool inside = curr->nodeAtPoint(result, locationInContainer, accumulatedOffset, root.lineTop(), root.lineBottom());
            if (inside) {
                renderer->updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset));
                return true;
            }
        }
    }

    return false;
}

void LineBoxListPainter::paint(const LayoutBoxModelObject& layoutObject, const PaintInfo& paintInfo, const LayoutPoint& paintOffset) const
{
    ASSERT(!shouldPaintSelfOutline(paintInfo.phase) && !shouldPaintDescendantOutlines(paintInfo.phase));

    // Only paint during the foreground/selection phases.
    if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseTextClip && paintInfo.phase != PaintPhaseMask)
        return;

    ASSERT(layoutObject.isLayoutBlock() || (layoutObject.isLayoutInline() && layoutObject.hasLayer())); // The only way an inline could paint like this is if it has a layer.

    if (paintInfo.phase == PaintPhaseForeground && paintInfo.isPrinting())
        addPDFURLRectsForInlineChildrenRecursively(layoutObject, paintInfo, paintOffset);

    // If we have no lines then we have no work to do.
    if (!m_lineBoxList.firstLineBox())
        return;

    if (!m_lineBoxList.anyLineIntersectsRect(LineLayoutBoxModel(const_cast<LayoutBoxModelObject*>(&layoutObject)), paintInfo.cullRect(), paintOffset))
        return;

    PaintInfo info(paintInfo);

    // See if our root lines intersect with the dirty rect. If so, then we paint
    // them. Note that boxes can easily overlap, so we can't make any assumptions
    // based off positions of our first line box or our last line box.
    for (InlineFlowBox* curr = m_lineBoxList.firstLineBox(); curr; curr = curr->nextLineBox()) {
        if (m_lineBoxList.lineIntersectsDirtyRect(LineLayoutBoxModel(const_cast<LayoutBoxModelObject*>(&layoutObject)), curr, info.cullRect(), paintOffset)) {
            RootInlineBox& root = curr->root();
            curr->paint(info, paintOffset, root.lineTop(), root.lineBottom());
        }
    }
}

void LineBoxListPainter::paint(LayoutBoxModelObject* layoutObject, const PaintInfo& paintInfo, const LayoutPoint& paintOffset) const
{
    ASSERT(paintInfo.phase != PaintPhaseOutline && paintInfo.phase != PaintPhaseSelfOutline && paintInfo.phase != PaintPhaseChildOutlines);

    // Only paint during the foreground/selection phases.
    if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseTextClip && paintInfo.phase != PaintPhaseMask)
        return;

    ASSERT(layoutObject->isLayoutBlock() || (layoutObject->isLayoutInline() && layoutObject->hasLayer())); // The only way an inline could paint like this is if it has a layer.

    // FIXME: When Skia supports annotation rect covering (https://code.google.com/p/skia/issues/detail?id=3872),
    // these rects may be covered line box drawings. Then we may need a dedicated paint phase.
    if (paintInfo.phase == PaintPhaseForeground && paintInfo.isPrinting())
        addPDFURLRectsForInlineChildrenRecursively(layoutObject, paintInfo, paintOffset);

    // If we have no lines then we have no work to do.
    if (!m_lineBoxList.firstLineBox())
        return;

    if (!m_lineBoxList.anyLineIntersectsRect(LineLayoutBoxModel(layoutObject), LayoutRect(paintInfo.rect), paintOffset))
        return;

    PaintInfo info(paintInfo);

    // See if our root lines intersect with the dirty rect. If so, then we paint
    // them. Note that boxes can easily overlap, so we can't make any assumptions
    // based off positions of our first line box or our last line box.
    for (InlineFlowBox* curr = m_lineBoxList.firstLineBox(); curr; curr = curr->nextLineBox()) {
        if (m_lineBoxList.lineIntersectsDirtyRect(LineLayoutBoxModel(layoutObject), curr, info, paintOffset)) {
            RootInlineBox& root = curr->root();
            curr->paint(info, paintOffset, root.lineTop(), root.lineBottom());
        }
    }
}

void InlinePainter::paintOutline(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    RenderStyle* styleToUse = m_renderInline.style();
    if (!styleToUse->hasOutline())
        return;

    LayoutRect bounds;
    if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
        // FIXME: Use tighter bounds.
        RenderBlock* cb = m_renderInline.containingBlock();
        bounds = cb->visualOverflowRect();
        bounds.moveBy(paintOffset);
    }
    RenderDrawingRecorder recorder(paintInfo.context, m_renderInline, paintInfo.phase, bounds);
    if (recorder.canUseCachedDrawing())
        return;

    if (styleToUse->outlineStyleIsAuto()) {
        if (RenderTheme::theme().shouldDrawDefaultFocusRing(&m_renderInline)) {
            // Only paint the focus ring by hand if the theme isn't able to draw the focus ring.
            ObjectPainter(m_renderInline).paintFocusRing(paintInfo, paintOffset, styleToUse);
        }
        return;
    }

    if (styleToUse->outlineStyle() == BNONE)
        return;

    Vector<LayoutRect> rects;

    rects.append(LayoutRect());
    for (InlineFlowBox* curr = m_renderInline.firstLineBox(); curr; curr = curr->nextLineBox()) {
        RootInlineBox& root = curr->root();
        LayoutUnit top = std::max<LayoutUnit>(root.lineTop(), curr->logicalTop());
        LayoutUnit bottom = std::min<LayoutUnit>(root.lineBottom(), curr->logicalBottom());
        rects.append(LayoutRect(curr->x(), top, curr->logicalWidth(), bottom - top));
    }
    rects.append(LayoutRect());

    Color outlineColor = m_renderInline.resolveColor(styleToUse, CSSPropertyOutlineColor);
    bool useTransparencyLayer = outlineColor.hasAlpha();

    GraphicsContext* graphicsContext = paintInfo.context;
    if (useTransparencyLayer) {
        graphicsContext->beginTransparencyLayer(static_cast<float>(outlineColor.alpha()) / 255);
        outlineColor = Color(outlineColor.red(), outlineColor.green(), outlineColor.blue());
    }

    for (unsigned i = 1; i < rects.size() - 1; i++)
        paintOutlineForLine(graphicsContext, paintOffset, rects.at(i - 1), rects.at(i), rects.at(i + 1), outlineColor);

    if (useTransparencyLayer)
        graphicsContext->endLayer();
}

void InlinePainter::paintOutline(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    const ComputedStyle& styleToUse = m_layoutInline.styleRef();
    if (!styleToUse.hasOutline())
        return;

    if (styleToUse.outlineStyleIsAuto()) {
        if (!LayoutTheme::theme().shouldDrawDefaultFocusRing(&m_layoutInline))
            return;
        if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*paintInfo.context, m_layoutInline, paintInfo.phase))
            return;

        Vector<LayoutRect> focusRingRects;
        m_layoutInline.addOutlineRects(focusRingRects, paintOffset);

        LayoutObjectDrawingRecorder recorder(*paintInfo.context, m_layoutInline, paintInfo.phase, outlinePaintRect(focusRingRects, LayoutPoint()));
        // Only paint the focus ring by hand if the theme isn't able to draw the focus ring.
        ObjectPainter(m_layoutInline).paintFocusRing(paintInfo, styleToUse, focusRingRects);
        return;
    }

    if (styleToUse.outlineStyle() == BNONE)
        return;

    GraphicsContext* graphicsContext = paintInfo.context;
    if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(*graphicsContext, m_layoutInline, paintInfo.phase))
        return;

    Vector<LayoutRect> rects;

    rects.append(LayoutRect());
    for (InlineFlowBox* curr = m_layoutInline.firstLineBox(); curr; curr = curr->nextLineBox()) {
        RootInlineBox& root = curr->root();
        LayoutUnit top = std::max<LayoutUnit>(root.lineTop(), curr->logicalTop());
        LayoutUnit bottom = std::min<LayoutUnit>(root.lineBottom(), curr->logicalBottom());
        rects.append(LayoutRect(curr->x(), top, curr->logicalWidth(), bottom - top));
    }
    rects.append(LayoutRect());

    Color outlineColor = m_layoutInline.resolveColor(styleToUse, CSSPropertyOutlineColor);
    bool useTransparencyLayer = outlineColor.hasAlpha();

    LayoutObjectDrawingRecorder recorder(*graphicsContext, m_layoutInline, paintInfo.phase, outlinePaintRect(rects, paintOffset));
    if (useTransparencyLayer) {
        graphicsContext->beginLayer(static_cast<float>(outlineColor.alpha()) / 255);
        outlineColor = Color(outlineColor.red(), outlineColor.green(), outlineColor.blue());
    }

    for (unsigned i = 1; i < rects.size() - 1; i++)
        paintOutlineForLine(graphicsContext, paintOffset, rects.at(i - 1), rects.at(i), rects.at(i + 1), outlineColor);

    if (useTransparencyLayer)
        graphicsContext->endLayer();
}

void RenderFlow::paintLines(PaintInfo& i, int _tx, int _ty)
{
    // Only paint during the foreground/selection phases.
    if (i.phase != PaintActionForeground && i.phase != PaintActionSelection && i.phase != PaintActionOutline)
        return;

    if (!firstLineBox())
        return;

    // We can check the first box and last box and avoid painting if we don't
    // intersect.  This is a quick short-circuit that we can take to avoid walking any lines.
    // FIXME: This check is flawed in two extremely obscure ways.
    // (1) If some line in the middle has a huge overflow, it might actually extend below the last line.
    // (2) The overflow from an inline block on a line is not reported to the line.
    int maxOutlineSize = maximalOutlineSize(i.phase);
    int yPos = firstLineBox()->root()->topOverflow() - maxOutlineSize;
    int h = maxOutlineSize + lastLineBox()->root()->bottomOverflow() - yPos;
    yPos += _ty;
    if ((yPos >= i.r.y() + i.r.height()) || (yPos + h <= i.r.y()))
        return;
    for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextFlowBox()) {
        yPos = curr->root()->topOverflow() - maxOutlineSize;
        h = curr->root()->bottomOverflow() + maxOutlineSize - yPos;
        yPos += _ty;
        if ((yPos < i.r.y() + i.r.height()) && (yPos + h > i.r.y()))
            curr->paint(i, _tx, _ty);
    }

    if (i.phase == PaintActionOutline && i.outlineObjects) {
          QValueList<RenderFlow *>::iterator it;;
          for( it = (*i.outlineObjects).begin(); it != (*i.outlineObjects).end(); ++it )
              if ((*it)->isRenderInline())
                  static_cast<RenderInline*>(*it)->paintOutlines(i.p, _tx, _ty);
          i.outlineObjects->clear();
    }
}

void RenderLineBoxList::paint(RenderBoxModelObject* renderer, PaintInfo& paintInfo, const LayoutPoint& paintOffset) const
{
    // Only paint during the foreground/selection phases.
    if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseOutline
        && paintInfo.phase != PaintPhaseSelfOutline && paintInfo.phase != PaintPhaseChildOutlines && paintInfo.phase != PaintPhaseTextClip
        && paintInfo.phase != PaintPhaseMask)
        return;

    ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could paint like this is if it has a layer.

    // If we have no lines then we have no work to do.
    if (!firstLineBox())
        return;

    if (!anyLineIntersectsRect(renderer, paintInfo.rect, paintOffset))
        return;

    PaintInfo info(paintInfo);
    ListHashSet<RenderInline*> outlineObjects;
    info.setOutlineObjects(&outlineObjects);

    // See if our root lines intersect with the dirty rect.  If so, then we paint
    // them.  Note that boxes can easily overlap, so we can't make any assumptions
    // based off positions of our first line box or our last line box.
    for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) {
        if (lineIntersectsDirtyRect(renderer, curr, info, paintOffset)) {
            RootInlineBox& root = curr->root();
            curr->paint(info, paintOffset, root.lineTop(), root.lineBottom());
        }
    }

    if (info.phase == PaintPhaseOutline || info.phase == PaintPhaseSelfOutline || info.phase == PaintPhaseChildOutlines) {
        ListHashSet<RenderInline*>::iterator end = info.outlineObjects()->end();
        for (ListHashSet<RenderInline*>::iterator it = info.outlineObjects()->begin(); it != end; ++it) {
            RenderInline* flow = *it;
            flow->paintOutline(info, paintOffset);
        }
        info.outlineObjects()->clear();
    }
}

void RenderLineBoxList::paint(RenderBoxModelObject* renderer, PaintInfo& paintInfo, const LayoutPoint& paintOffset, Vector<RenderBox*>& layers) const
{
    ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could paint like this is if it has a layer.

    // If we have no lines then we have no work to do.
    if (!firstLineBox())
        return;

    if (!anyLineIntersectsRect(renderer, paintInfo.rect, paintOffset))
        return;

    PaintInfo info(paintInfo);

    // See if our root lines intersect with the dirty rect.  If so, then we paint
    // them.  Note that boxes can easily overlap, so we can't make any assumptions
    // based off positions of our first line box or our last line box.
    for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) {
        if (lineIntersectsDirtyRect(renderer, curr, info, paintOffset)) {
            RootInlineBox& root = curr->root();
            curr->paint(info, paintOffset, root.lineTop(), root.lineBottom(), layers);
        }
    }
}

void RenderFlow::paintLines(PaintInfo& i, int _tx, int _ty)
{
    // Only paint during the foreground/selection phases.
    if (i.phase != PaintActionForeground && i.phase != PaintActionSelection && i.phase != PaintActionOutline)
        return;

    bool inlineFlow = isInlineFlow();
    if (inlineFlow)
        KHTMLAssert(m_layer); // The only way a compact/run-in/inline could paint like this is if it has a layer.

    // If we have no lines then we have no work to do.
    if (!firstLineBox())
        return;

    // We can check the first box and last box and avoid painting if we don't
    // intersect.  This is a quick short-circuit that we can take to avoid walking any lines.
    // FIXME: This check is flawed in two extremely obscure ways.
    // (1) If some line in the middle has a huge overflow, it might actually extend below the last line.
    // (2) The overflow from an inline block on a line is not reported to the line.
    int yPos = firstLineBox()->root()->selectionTop() - maximalOutlineSize(i.phase);
    int h = maximalOutlineSize(i.phase) + lastLineBox()->root()->selectionTop() + lastLineBox()->root()->selectionHeight() - yPos;
    yPos += _ty;
    if ((yPos >= i.r.y() + i.r.height()) || (yPos + h <= i.r.y()))
        return;

    // See if our root lines intersect with the dirty rect.  If so, then we paint
    // them.  Note that boxes can easily overlap, so we can't make any assumptions
    // based off positions of our first line box or our last line box.
    bool isPrinting = (i.p->device()->devType() == QInternal::Printer);
    for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextFlowBox()) {
        if (isPrinting) {
            // FIXME: This is a feeble effort to avoid splitting a line across two pages.
            // It is utterly inadequate, and this should not be done at paint time at all.
            // The whole way objects break across pages needs to be redone.
            RenderCanvas* c = canvas();
            // Try to avoid splitting a line vertically, but only if it's less than the height
            // of the entire page.
            if (curr->root()->bottomOverflow() - curr->root()->topOverflow() <= c->printRect().height()) {
                if (_ty + curr->root()->bottomOverflow() > c->printRect().y() + c->printRect().height()) {
                    if (_ty + curr->root()->topOverflow() < c->truncatedAt())
                        c->setBestTruncatedAt(_ty + curr->root()->topOverflow(), this);
                    // If we were able to truncate, don't paint.
                    if (_ty + curr->root()->topOverflow() >= c->truncatedAt())
                        break;
                }
            }
        }

        int top = kMin(curr->root()->topOverflow(), curr->root()->selectionTop()) - maximalOutlineSize(i.phase);
        int bottom = kMax(curr->root()->selectionTop() + curr->root()->selectionHeight(), curr->root()->bottomOverflow()) + maximalOutlineSize(i.phase);
        h = bottom - top;
        yPos = _ty + top;
        if ((yPos < i.r.y() + i.r.height()) && (yPos + h > i.r.y()))
            curr->paint(i, _tx, _ty);
    }

    if (i.phase == PaintActionOutline && i.outlineObjects) {
        // FIXME: Will the order in which we added objects to the dictionary be preserved? Probably not.
        // This means the paint order of outlines will be wrong, although this is a minor issue.
        QPtrDictIterator<RenderFlow> objects(*i.outlineObjects);
        for (objects.toFirst(); objects.current(); ++objects) {
#ifdef APPLE_CHANGES
            if (objects.current()->style()->outlineStyleIsAuto())
                objects.current()->paintFocusRing(i.p, _tx, _ty);
            else
#endif
                objects.current()->paintOutlines(i.p, _tx, _ty);
        }
        i.outlineObjects->clear();
    }
}

void RenderLineBoxList::readyWRATHWidgets(PaintedWidgetsOfWRATHHandle &handle,
                                          RenderBoxModelObject *renderer,
                                          PaintInfoOfWRATH &paintInfo, int tx, int ty)
{
    RenderLineBoxList_WRATHWidgets *d;
    d=RenderLineBoxList_WRATHWidgets::object(renderer, handle);

    ContextOfWRATH::AutoPushNode autoPushRoot(paintInfo.wrath_context, d->m_root_node);

    /*
      this just.. sucks. WebKit builds a list of 
      RenderInline objects that it will draw outlines.
      It is not clear if and how that list changes,
      so we punt and make all them handle non-visible
      and only those that are found in the list
      are then made visible.
     */
    d->m_handles.hideEachObject();
    d->m_outlineHandles.hideEachObject();

  // Only paint during the foreground/selection phases.
    if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseOutline 
        && paintInfo.phase != PaintPhaseSelfOutline && paintInfo.phase != PaintPhaseChildOutlines && paintInfo.phase != PaintPhaseTextClip
        && paintInfo.phase != PaintPhaseMask)
        return;

    ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could paint like this is if it has a layer.

    // If we have no lines then we have no work to do.
    if (!firstLineBox())
        return;

    RenderView* v = renderer->view();
    bool usePrintRect = !v->printRect().isEmpty();
    int outlineSize = renderer->maximalOutlineSize(paintInfo.phase);
    if (!anyLineIntersectsRect(renderer, paintInfo.rect, tx, ty, usePrintRect, outlineSize))
        return;

    PaintInfoOfWRATH info(paintInfo);
    ListHashSet<RenderInline*> outlineObjects;
    info.outlineObjects = &outlineObjects;

    

    for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) {
        if (usePrintRect) {

            RootInlineBox* root = curr->root();
            int topForPaginationCheck = curr->logicalTopVisualOverflow(root->lineTop());
            int bottomForPaginationCheck = curr->logicalLeftVisualOverflow();
            if (!curr->parent()) {
                // We're a root box.  Use lineTop and lineBottom as well here.
                topForPaginationCheck = min(topForPaginationCheck, root->lineTop());
                bottomForPaginationCheck = max(bottomForPaginationCheck, root->lineBottom());
            }
            if (bottomForPaginationCheck - topForPaginationCheck <= v->printRect().height()) {
                if (ty + bottomForPaginationCheck > v->printRect().maxY()) {
                    if (RootInlineBox* nextRootBox = curr->root()->nextRootBox())
                        bottomForPaginationCheck = min(bottomForPaginationCheck, min(nextRootBox->logicalTopVisualOverflow(), nextRootBox->lineTop()));
                }
                if (ty + bottomForPaginationCheck > v->printRect().maxY()) {
                    if (ty + topForPaginationCheck < v->truncatedAt())
                        v->setBestTruncatedAt(ty + topForPaginationCheck, renderer);
                    // If we were able to truncate, don't paint.
                    if (ty + topForPaginationCheck >= v->truncatedAt())
                        break;
                }
            }
        }

        if (lineIntersectsDirtyRect(renderer, curr, info, tx, ty)) {
            RootInlineBox* root = curr->root();
            PaintedWidgetsOfWRATHHandleT<InlineBox> &currHandle(d->m_handles.getHandle(curr));

            currHandle.visible(true);
            curr->readyWRATHWidgets(currHandle, info, tx, ty, root->lineTop(), root->lineBottom());
        }
    }

    if (info.phase == PaintPhaseOutline || info.phase == PaintPhaseSelfOutline || info.phase == PaintPhaseChildOutlines) {
        ListHashSet<RenderInline*>::iterator end = info.outlineObjects->end();
        for (ListHashSet<RenderInline*>::iterator it = info.outlineObjects->begin(); it != end; ++it) {
            RenderInline* flow = *it;
            PaintedWidgetsOfWRATHHandle &handle(d->m_outlineHandles.getHandle(flow));

            handle.visible(true);
            flow->readyWRATHWidgetOutline(handle, info.wrath_context, tx, ty);
        }
        info.outlineObjects->clear();
    }

    
    d->m_handles.removeNonVisibleHandles();
    d->m_outlineHandles.removeNonVisibleHandles();
}

void RenderLineBoxList::paint(RenderBoxModelObject* renderer, PaintInfo& paintInfo, const LayoutPoint& paintOffset) const
{
    ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could paint like this is if it has a layer.

    // If we have no lines then we have no work to do.
    if (!firstLineBox())
        return;

    // FIXME: Paint-time pagination is obsolete and is now only used by embedded WebViews inside AppKit
    // NSViews.  Do not add any more code for this.
    RenderView& v = renderer->view();
    bool usePrintRect = !v.printRect().isEmpty();
    if (!anyLineIntersectsRect(renderer, paintInfo.rect, paintOffset, usePrintRect))
        return;

    PaintInfo info(paintInfo);
    ListHashSet<RenderInline*> outlineObjects;
    info.outlineObjects = &outlineObjects;

    // See if our root lines intersect with the dirty rect.  If so, then we paint
    // them.  Note that boxes can easily overlap, so we can't make any assumptions
    // based off positions of our first line box or our last line box.
    for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) {
        if (usePrintRect) {
            // FIXME: This is the deprecated pagination model that is still needed
            // for embedded views inside AppKit.  AppKit is incapable of paginating vertical
            // text pages, so we don't have to deal with vertical lines at all here.
            const RootInlineBox& rootBox = curr->root();
            LayoutUnit topForPaginationCheck = curr->logicalTopVisualOverflow(rootBox.lineTop());
            LayoutUnit bottomForPaginationCheck = curr->logicalLeftVisualOverflow();
            if (!curr->parent()) {
                // We're a root box.  Use lineTop and lineBottom as well here.
                topForPaginationCheck = std::min(topForPaginationCheck, rootBox.lineTop());
                bottomForPaginationCheck = std::max(bottomForPaginationCheck, rootBox.lineBottom());
            }
            if (bottomForPaginationCheck - topForPaginationCheck <= v.printRect().height()) {
                if (paintOffset.y() + bottomForPaginationCheck > v.printRect().maxY()) {
                    if (RootInlineBox* nextRootBox = rootBox.nextRootBox())
                        bottomForPaginationCheck = std::min(bottomForPaginationCheck, std::min<LayoutUnit>(nextRootBox->logicalTopVisualOverflow(), nextRootBox->lineTop()));
                }
                if (paintOffset.y() + bottomForPaginationCheck > v.printRect().maxY()) {
                    if (paintOffset.y() + topForPaginationCheck < v.truncatedAt())
                        v.setBestTruncatedAt(paintOffset.y() + topForPaginationCheck, renderer);
                    // If we were able to truncate, don't paint.
                    if (paintOffset.y() + topForPaginationCheck >= v.truncatedAt())
                        break;
                }
            }
        }

        if (lineIntersectsDirtyRect(renderer, curr, info, paintOffset)) {
            const RootInlineBox& rootBox = curr->root();
            curr->paint(info, paintOffset, rootBox.lineTop(), rootBox.lineBottom());
        }
    }

    if (info.phase == PaintPhaseOutline || info.phase == PaintPhaseSelfOutline || info.phase == PaintPhaseChildOutlines) {
        ListHashSet<RenderInline*>::iterator end = info.outlineObjects->end();
        for (ListHashSet<RenderInline*>::iterator it = info.outlineObjects->begin(); it != end; ++it) {
            RenderInline* flow = *it;
            flow->paintOutline(info, paintOffset);
        }
        info.outlineObjects->clear();
    }
}

void RenderLineBoxList::dirtyLinesFromChangedChild(RenderObject* container, RenderObject* child)
{
    if (!container->parent() || (container->isRenderBlock() && (container->selfNeedsLayout() || !container->isBlockFlow())))
        return;

    // If we have no first line box, then just bail early.
    if (!firstLineBox()) {
        // For an empty inline, go ahead and propagate the check up to our parent, unless the parent
        // is already dirty.
        if (container->isInline() && !container->parent()->selfNeedsLayout())
            container->parent()->dirtyLinesFromChangedChild(container);
        return;
    }

    // Try to figure out which line box we belong in.  First try to find a previous
    // line box by examining our siblings.  If we didn't find a line box, then use our 
    // parent's first line box.
    RootInlineBox* box = 0;
    RenderObject* curr = 0;
    for (curr = child->previousSibling(); curr; curr = curr->previousSibling()) {
        if (curr->isFloatingOrPositioned())
            continue;

        if (curr->isReplaced()) {
            InlineBox* wrapper = toRenderBox(curr)->inlineBoxWrapper();
            if (wrapper)
                box = wrapper->root();
        } else if (curr->isText()) {
            InlineTextBox* textBox = toRenderText(curr)->lastTextBox();
            if (textBox)
                box = textBox->root();
        } else if (curr->isRenderInline()) {
            InlineFlowBox* flowBox = toRenderInline(curr)->lastLineBox();
            if (flowBox)
                box = flowBox->root();
        }

        if (box)
            break;
    }
    if (!box)
        box = firstLineBox()->root();

    // If we found a line box, then dirty it.
    if (box) {
        RootInlineBox* adjacentBox;
        box->markDirty();

        // dirty the adjacent lines that might be affected
        // NOTE: we dirty the previous line because RootInlineBox objects cache
        // the address of the first object on the next line after a BR, which we may be
        // invalidating here.  For more info, see how RenderBlock::layoutInlineChildren
        // calls setLineBreakInfo with the result of findNextLineBreak.  findNextLineBreak,
        // despite the name, actually returns the first RenderObject after the BR.
        // <rdar://problem/3849947> "Typing after pasting line does not appear until after window resize."
        adjacentBox = box->prevRootBox();
        if (adjacentBox)
            adjacentBox->markDirty();
        if (child->isBR() || (curr && curr->isBR())) {
            adjacentBox = box->nextRootBox();
            if (adjacentBox)
                adjacentBox->markDirty();
        }
    }
}

void RenderLineBoxList::paint(RenderBoxModelObject* renderer, RenderObject::PaintInfo& paintInfo, int tx, int ty) const
{
    // Only paint during the foreground/selection phases.(只有画前景和选择才会跑到这里)
    if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseOutline 
        && paintInfo.phase != PaintPhaseSelfOutline && paintInfo.phase != PaintPhaseChildOutlines && paintInfo.phase != PaintPhaseTextClip
        && paintInfo.phase != PaintPhaseMask)
        return;

    ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could paint like this is if it has a layer.

    // If we have no lines then we have no work to do.
    if (!firstLineBox())
        return;

    // We can check the first box and last box and avoid painting if we don't
    // intersect.  This is a quick short-circuit that we can take to avoid walking any lines.
    // FIXME: This check is flawed in the following extremely obscure way:
    // if some line in the middle has a huge overflow, it might actually extend below the last line.
    int yPos = firstLineBox()->topVisibleOverflow() - renderer->maximalOutlineSize(paintInfo.phase);
    int h = renderer->maximalOutlineSize(paintInfo.phase) + lastLineBox()->bottomVisibleOverflow() - yPos; // 要画的inline块(从第一行到最后一行的)整个高度
    yPos += ty;	// 起始高度
    if (yPos >= paintInfo.rect.bottom() || yPos + h <= paintInfo.rect.y())
        return;

    RenderObject::PaintInfo info(paintInfo);
    ListHashSet<RenderInline*> outlineObjects;
    info.outlineObjects = &outlineObjects;

    // See if our root lines intersect with the dirty rect.  If so, then we paint
    // them.  Note that boxes can easily overlap, so we can't make any assumptions
    // based off positions of our first line box or our last line box.
    RenderView* v = renderer->view();
    bool usePrintRect = !v->printRect().isEmpty();
    for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) { // 开始对每行进行绘制
        if (usePrintRect) {
            // FIXME: This is a feeble effort to avoid splitting a line across two pages.
            // It is utterly inadequate, and this should not be done at paint time at all.
            // The whole way objects break across pages needs to be redone.
            // Try to avoid splitting a line vertically, but only if it's less than the height
            // of the entire page.
            if (curr->bottomVisibleOverflow() - curr->topVisibleOverflow() <= v->printRect().height()) {
                if (ty + curr->bottomVisibleOverflow() > v->printRect().bottom()) {
                    if (ty + curr->topVisibleOverflow() < v->truncatedAt())
                        v->setBestTruncatedAt(ty + curr->root()->topVisibleOverflow(), renderer);
                    // If we were able to truncate, don't paint.
                    if (ty + curr->topVisibleOverflow() >= v->truncatedAt())
                        break;
                }
            }
        }

        int top = min(curr->topVisibleOverflow(), curr->root()->selectionTop()) - renderer->maximalOutlineSize(info.phase); // 高点
        int bottom = curr->bottomVisibleOverflow() + renderer->maximalOutlineSize(info.phase); // 底点
        h = bottom - top;	// 高度
        yPos = ty + top;	// 开始绘制点
        v->setMinimumColumnHeight(h);
        if (yPos < info.rect.bottom() && yPos + h > info.rect.y()) 
            curr->paint(info, tx, ty); // 开始绘制该行
    }

    if (info.phase == PaintPhaseOutline || info.phase == PaintPhaseSelfOutline || info.phase == PaintPhaseChildOutlines) {
        ListHashSet<RenderInline*>::iterator end = info.outlineObjects->end();
        for (ListHashSet<RenderInline*>::iterator it = info.outlineObjects->begin(); it != end; ++it) {
            RenderInline* flow = *it;
            flow->paintOutline(info.context, tx, ty);
        }
        info.outlineObjects->clear();
    }
}