C++ LayoutView::style方法代码示例

void TextAutosizer::updatePageInfo()
{
    if (m_updatePageInfoDeferred || !m_document->page() || !m_document->settings())
        return;

    PageInfo previousPageInfo(m_pageInfo);
    m_pageInfo.m_settingEnabled = m_document->settings()->textAutosizingEnabled();

    if (!m_pageInfo.m_settingEnabled || m_document->printing()) {
        m_pageInfo.m_pageNeedsAutosizing = false;
    } else {
        LayoutView* layoutView = m_document->layoutView();
        bool horizontalWritingMode = isHorizontalWritingMode(layoutView->style()->writingMode());

        // FIXME: With out-of-process iframes, the top frame can be remote and
        // doesn't have sizing information. Just return if this is the case.
        Frame* frame = m_document->frame()->tree().top();
        if (frame->isRemoteFrame())
            return;

        LocalFrame* mainFrame = toLocalFrame(frame);
        IntSize frameSize = m_document->settings()->textAutosizingWindowSizeOverride();
        if (frameSize.isEmpty())
            frameSize = windowSize();

        m_pageInfo.m_frameWidth = horizontalWritingMode ? frameSize.width() : frameSize.height();

        IntSize layoutSize = mainFrame->view()->layoutSize();
        m_pageInfo.m_layoutWidth = horizontalWritingMode ? layoutSize.width() : layoutSize.height();

        // Compute the base font scale multiplier based on device and accessibility settings.
        m_pageInfo.m_baseMultiplier = m_document->settings()->accessibilityFontScaleFactor();
        // If the page has a meta viewport or @viewport, don't apply the device scale adjustment.
        const ViewportDescription& viewportDescription = mainFrame->document()->viewportDescription();
        if (!viewportDescription.isSpecifiedByAuthor()) {
            float deviceScaleAdjustment = m_document->settings()->deviceScaleAdjustment();
            m_pageInfo.m_baseMultiplier *= deviceScaleAdjustment;
        }

        m_pageInfo.m_pageNeedsAutosizing = !!m_pageInfo.m_frameWidth
            && (m_pageInfo.m_baseMultiplier * (static_cast<float>(m_pageInfo.m_layoutWidth) / m_pageInfo.m_frameWidth) > 1.0f);
    }

    if (m_pageInfo.m_pageNeedsAutosizing) {
        // If page info has changed, multipliers may have changed. Force a layout to recompute them.
        if (m_pageInfo.m_frameWidth != previousPageInfo.m_frameWidth
            || m_pageInfo.m_layoutWidth != previousPageInfo.m_layoutWidth
            || m_pageInfo.m_baseMultiplier != previousPageInfo.m_baseMultiplier
            || m_pageInfo.m_settingEnabled != previousPageInfo.m_settingEnabled)
            setAllTextNeedsLayout();
    } else if (previousPageInfo.m_hasAutosized) {
        // If we are no longer autosizing the page, we won't do anything during the next layout.
        // Set all the multipliers back to 1 now.
        resetMultipliers();
        m_pageInfo.m_hasAutosized = false;
    }
}

void PrintContext::computePageRectsWithPageSizeInternal(const FloatSize& pageSizeInPixels)
{
    if (!m_frame->document() || !m_frame->view() || !m_frame->document()->layoutView())
        return;

    LayoutView* view = m_frame->document()->layoutView();

    IntRect docRect = view->documentRect();

    int pageWidth = pageSizeInPixels.width();
    int pageHeight = pageSizeInPixels.height();

    bool isHorizontal = view->style()->isHorizontalWritingMode();

    int docLogicalHeight = isHorizontal ? docRect.height() : docRect.width();
    int pageLogicalHeight = isHorizontal ? pageHeight : pageWidth;
    int pageLogicalWidth = isHorizontal ? pageWidth : pageHeight;

    int inlineDirectionStart;
    int inlineDirectionEnd;
    int blockDirectionStart;
    int blockDirectionEnd;
    if (isHorizontal) {
        if (view->style()->isFlippedBlocksWritingMode()) {
            blockDirectionStart = docRect.maxY();
            blockDirectionEnd = docRect.y();
        } else {
            blockDirectionStart = docRect.y();
            blockDirectionEnd = docRect.maxY();
        }
        inlineDirectionStart = view->style()->isLeftToRightDirection() ? docRect.x() : docRect.maxX();
        inlineDirectionEnd = view->style()->isLeftToRightDirection() ? docRect.maxX() : docRect.x();
    } else {
        if (view->style()->isFlippedBlocksWritingMode()) {
            blockDirectionStart = docRect.maxX();
            blockDirectionEnd = docRect.x();
        } else {
            blockDirectionStart = docRect.x();
            blockDirectionEnd = docRect.maxX();
        }
        inlineDirectionStart = view->style()->isLeftToRightDirection() ? docRect.y() : docRect.maxY();
        inlineDirectionEnd = view->style()->isLeftToRightDirection() ? docRect.maxY() : docRect.y();
    }

    unsigned pageCount = ceilf((float)docLogicalHeight / pageLogicalHeight);
    for (unsigned i = 0; i < pageCount; ++i) {
        int pageLogicalTop = blockDirectionEnd > blockDirectionStart ?
            blockDirectionStart + i * pageLogicalHeight :
            blockDirectionStart - (i + 1) * pageLogicalHeight;

        int pageLogicalLeft = inlineDirectionEnd > inlineDirectionStart ? inlineDirectionStart : inlineDirectionStart - pageLogicalWidth;
        IntRect pageRect(pageLogicalLeft, pageLogicalTop, pageLogicalWidth, pageLogicalHeight);
        if (!isHorizontal)
            pageRect = pageRect.transposedRect();
        m_pageRects.append(pageRect);

    }
}