C++ QTextLayout::lineAt方法代码示例

void TestDocumentLayout::testCenteredItems()
{
    initForNewTest("ListItem\nListItem\nListItem");

    KoListStyle listStyle;
    KoListLevelProperties llp;
    llp.setStyle(KoListStyle::DecimalItem);
    listStyle.setLevelProperties(llp);

    QTextBlock block = m_doc->begin(); // normal block
    QVERIFY(block.isValid());
    listStyle.applyStyle(block);
    block = block.next(); // centered block
    QVERIFY(block.isValid());
    listStyle.applyStyle(block);
    QTextBlockFormat fmt;
    fmt.setAlignment(Qt::AlignHCenter);
    QTextCursor cursor(block);
    cursor.mergeBlockFormat(fmt);
    block = block.next(); // centered RTL text.
    listStyle.applyStyle(block);
    cursor = QTextCursor(block);
    fmt.setProperty(KoParagraphStyle::TextProgressionDirection, KoText::RightLeftTopBottom);
    cursor.mergeBlockFormat(fmt);

    m_layout->layout();

    block = m_doc->begin();
    QTextLayout *layout = block.layout();
    QTextLine line1 = layout->lineAt(0);
    KoTextBlockData *data1 = dynamic_cast<KoTextBlockData *>(block.userData());
    QVERIFY(line1.isValid());
    QVERIFY(line1.width() < 200); // the counter takes some space.

    block = block.next();
    layout = block.layout();
    QTextLine line2 = layout->lineAt(0);
    KoTextBlockData *data2 = dynamic_cast<KoTextBlockData *>(block.userData());
    QVERIFY(line2.isValid());
    QVERIFY(line2.width() < 200); // the counter takes some space.
    QCOMPARE(line1.width(), line2.width());

    const qreal width1 = line1.naturalTextWidth() + data1->counterWidth() + data1->counterSpacing();
    const qreal width2 = line2.naturalTextWidth() + data2->counterWidth() + data2->counterSpacing();
    QCOMPARE(width1, width2);
    QVERIFY(data1->counterPosition().x() < data2->counterPosition().x());
    const qreal padding = (200 - width2) / 2;
    QVERIFY(padding > 0);// not really a layout test, but the rest will be bogus otherwise.
    QCOMPARE(data2->counterPosition().x(), padding); // close to the centered text.

    // right to left parag places the counter on the right. Its centered, so not the far right.
    block = block.next();
    layout = block.layout();
    QTextLine line = layout->lineAt(0);
    KoTextBlockData *data = dynamic_cast<KoTextBlockData *>(block.userData());
    QCOMPARE(data->counterPosition().x(), 200 - padding - data->counterWidth());
}

void TestDocumentLayout::placeAnchoredFrame3()
{
    // basic inline frame that acts like a really big character
    initForNewTest(QString(loremIpsum));
    MockShape *picture = new MockShape();
    picture->setSize(QSizeF(100, 100));
    KTextAnchor *anchor = new KTextAnchor(picture);
    anchor->setAlignment(KTextAnchor::VerticalOffset);
    anchor->setAlignment(KTextAnchor::HorizontalOffset);
    QTextCursor cursor(doc);
    KInlineTextObjectManager *manager = new KInlineTextObjectManager();
    layout->setInlineTextObjectManager(manager);
    MockLayoutState *state = new MockLayoutState(doc);
    layout->setLayout(state);
    state->shape = shape1;
    manager->insertInlineObject(cursor, anchor);
    layout->layout();

/*
    I have two goals with 'offset'.
    One is that I want to be able to change the baseline of my anchored object.
    The other is that OOo / ODF allows me to have an arbitairy distance from my anchor
    so I can place something at the center of my page or whatever.

    So what about I switch from the first to the latter based on the font height.
        If my offset 'x' != 0,  make the image floating.
        If my offset 'y' is such that it would be above or below my line; make floating.
*/

    QTextLayout *lay = doc->begin().layout();
    QVERIFY(lay->lineCount() >= 2);
    QTextLine line = lay->lineAt(0);
    QCOMPARE(line.descent(), (qreal) 100);
    QCOMPARE(line.position(), QPointF());
    line = lay->lineAt(1);
    QVERIFY(line.height() < 20);

    // now move the character which makes it a shape to run around and no longer
    // a big character.
    anchor->setOffset(QPointF(50, 20));
    layout->layout();

    lay = doc->begin().layout();
    QVERIFY(lay->lineCount() >= 2);
    line = lay->lineAt(0);
    QVERIFY(line.height() < 20);
    QCOMPARE(line.position(), QPointF());
    line = lay->lineAt(1);
    QVERIFY(line.height() < 20);
    QCOMPARE(line.position().x(), 0.);
    QVERIFY(qAbs(line.position().y() - 14.4) <  0.125);
}

void YTDelegate::layoutText(QTextLayout& textLayout, QString text, QSize constraint) const
{
    QTextOption textOption(Qt::AlignJustify);
    textLayout.setTextOption(textOption);
    textLayout.setText(text);
    textLayout.beginLayout();
    int lHeight = 0;
    while(true){
        QTextLine line = textLayout.createLine();
        if(!line.isValid())
            break;
        line.setLineWidth(constraint.width());
        line.setPosition(QPointF(0, lHeight));
        if(lHeight + line.height() > constraint.height())
        {
            QTextLine lastLine = textLayout.lineAt(textLayout.lineCount() - 2);
            QString lastString = text.mid(lastLine.textStart());
            QFontMetrics fm(textLayout.font());
            text.chop(lastString.length());
            text += fm.elidedText(lastString, Qt::ElideRight, constraint.width()-1);
            textLayout.endLayout();
            layoutText(textLayout, text, constraint);
            return;
        }
        lHeight += line.height();
        lHeight += line.leading();
    }
    textLayout.endLayout();
}

void tst_QTextFormat::testTabsUsed()
{
    QTextDocument doc;
    QTextCursor cursor(&doc);

    QList<QTextOption::Tab> tabs;
    QTextBlockFormat format;
    QTextOption::Tab tab;
    tab.position = 100;
    tabs.append(tab);
    format.setTabPositions(tabs);
    cursor.mergeBlockFormat(format);
    cursor.insertText("foo\tbar");
    //doc.setPageSize(QSizeF(200, 200));
    doc.documentLayout()->pageCount(); // force layout;

    QTextBlock block = doc.begin();
    QTextLayout *layout = block.layout();
    QVERIFY(layout);
    QCOMPARE(layout->lineCount(), 1);
    QTextLine line = layout->lineAt(0);
    QCOMPARE(line.cursorToX(4), 100.);

    QTextOption option = layout->textOption();
    QCOMPARE(option.tabs().count(), tabs.count());

}

QList<QGlyphRun> QTextFragment::glyphRuns(int pos, int len) const
{
    if (!p || !n)
        return QList<QGlyphRun>();

    int blockNode = p->blockMap().findNode(position());

    const QTextBlockData *blockData = p->blockMap().fragment(blockNode);
    QTextLayout *layout = blockData->layout;

    int blockPosition = p->blockMap().position(blockNode);
    if (pos < 0)
        pos = position() - blockPosition;
    if (len < 0)
        len = length();
    if (len == 0)
        return QList<QGlyphRun>();

    QList<QGlyphRun> ret;
    for (int i=0; i<layout->lineCount(); ++i) {
        QTextLine textLine = layout->lineAt(i);
        ret += textLine.glyphRuns(pos, len);
    }

    return ret;
}

    void setContent(const ToolTipContent &data)
    {
        QString html;
        if (!data.mainText().isEmpty()) {
            html.append("<div><b>" + data.mainText() + "</b></div>");
        }
        html.append(data.subText());

        m_anchor.clear();
        m_document->clear();
        data.registerResources(m_document);
        if (!html.isEmpty()) {
            m_document->setHtml("<p>" + html + "</p>");
        }
        m_document->adjustSize();

        m_haloRects.clear();
        QTextLayout *layout = m_document->begin().layout();
        //layout->setPosition(QPointF(textRect.x(), textBoundingRect->y()));
        QTextLine line;
        for (int i = 0; i < layout->lineCount(); ++i) {
            line = layout->lineAt(i);

            // Add halo rect only when a non empty line is found
            if (line.naturalTextWidth()) {
                m_haloRects.append(line.naturalTextRect().translated(layout->position().toPoint()).toRect().translated(m_margin, m_margin));
            }
        }

        update();
    }

void TestDocumentLayout::testBasicList()
{
    initForNewTest("Base\nListItem\nListItem2: The quick brown fox jums over the lazy dog.\nNormal\nNormal");

    KoParagraphStyle style;
    QTextBlock block = m_doc->begin();
    style.applyStyle(block);
    block = block.next();
    QVERIFY(block.isValid());

    KoListStyle listStyle;
    KoListLevelProperties level1;
    level1.setStyle(KoListStyle::Bullet);
    listStyle.setLevelProperties(level1);
    style.setListStyle(&listStyle);
    style.applyStyle(block); // make this a listStyle
    QVERIFY(block.textList());
    QCOMPARE(block.textList()->format().intProperty(QTextListFormat::ListStyle), (int) KoListStyle::Bullet);
    block = block.next();
    QVERIFY(block.isValid());
    style.applyStyle(block); // make this a listStyle

    m_layout->layout();
    QTextLayout *blockLayout = m_block.layout();

    QCOMPARE(blockLayout->lineAt(0).x(), 0.0);
    block = m_doc->begin().next();
    QVERIFY(block.isValid());
    blockLayout = block.layout(); // parag 2
    KoTextBlockData *data = dynamic_cast<KoTextBlockData *>(block.userData());
    QVERIFY(data);
    qreal counterSpacing = data->counterSpacing();
    QVERIFY(counterSpacing > 0.);
    // 12 is hardcoded to be the width of a discitem (taken from the default font):
    QCOMPARE(blockLayout->lineAt(0).x(), 12.0 + counterSpacing);
    block = block.next();
    QVERIFY(block.isValid());
    blockLayout = block.layout(); // parag 3
    QCOMPARE(blockLayout->lineAt(0).x(), 12.0 + counterSpacing);
    QVERIFY(blockLayout->lineCount() > 1);
    QCOMPARE(blockLayout->lineAt(1).x(), 12.0 + counterSpacing); // make sure not only the first line is indented
    block = block.next();
    QVERIFY(block.isValid());
    blockLayout = block.layout(); // parag 4
    QCOMPARE(blockLayout->lineAt(0).x(), 0.0);
}

int KTextDocumentLayout::hitTestIterated(QTextFrame::iterator begin, QTextFrame::iterator end, const QPointF &point, Qt::HitTestAccuracy accuracy) const
{
    int position = -1;
    QTextFrame::iterator it = begin;
    for (it = begin; it != end; ++it) {
        QTextBlock block = it.currentBlock();
        QTextTable *table = qobject_cast<QTextTable*>(it.currentFrame());
        QTextFrame *subFrame = it.currentFrame();

        if (table) {
            QTextTableCell cell = m_state->hitTestTable(table, point);
            if (cell.isValid()) {
                position = hitTestIterated(cell.begin(), cell.end(), point,
                                accuracy);
                if (position == -1)
                    position = cell.lastPosition();
                return position;
            }
            continue;
        } else if (subFrame) {
            position = hitTestIterated(subFrame->begin(), subFrame->end(), point, accuracy);
            if (position != -1)
                return position;
            continue;
        } else {
            if (!block.isValid())
                continue;
        }
        // kDebug(32500) <<"hitTest[" << point.x() <<"," << point.y() <<"]";
        QTextLayout *layout = block.layout();
        if (point.y() > layout->boundingRect().bottom()) {
            // just skip this block. position = block.position() + block.length() - 1;
            continue;
        }
        for (int i = 0; i < layout->lineCount(); i++) {
            QTextLine line = layout->lineAt(i);
            // kDebug(32500) <<" + line[" << line.textStart() <<"]:" << line.y() <<"-" << line.height();
            if (point.y() > line.y() + line.height()) {
                position = line.textStart() + line.textLength();
                continue;
            }
            if (accuracy == Qt::ExactHit && point.y() < line.y()) // between lines
                return -1;
            if (accuracy == Qt::ExactHit && // left or right of line
                    (point.x() < line.x() || point.x() > line.x() + line.width()))
                return -1;
            if (point.x() > line.width() && layout->textOption().textDirection() == Qt::RightToLeft) {
                // totally right of RTL text means the position is the start of the text.
                return block.position() + line.textStart();
            }
            return block.position() + line.xToCursor(point.x());
        }
    }
    return -1;
}

void TestSections::testBasicLayout()
{
    KSectionStyle *sectionStyle = new KSectionStyle();
    Q_ASSERT(sectionStyle);
    sectionStyle->setLeftMargin(0.0);
    sectionStyle->setRightMargin(0.0);

    initTest(sectionStyle);

    m_layout->layout();

    // a block in a section with no special margins or columns should be just as wide
    // as the reference (first) block.
    QTextLayout *blockLayout = m_doc->begin().layout();
    QCOMPARE(blockLayout->lineAt(0).width(), 200.0);

    blockLayout = m_doc->begin().next().layout();
    QCOMPARE(blockLayout->lineAt(0).width(), 200.0);
    cleanupTest();
}

void TestSections::testMoveByMargin()
{
    KSectionStyle *sectionStyle = new KSectionStyle();
    Q_ASSERT(sectionStyle);
    sectionStyle->setLeftMargin(20.0);
    sectionStyle->setRightMargin(-20.0);

    initTest(sectionStyle);

    m_layout->layout();

    // a block in a section with margins (and no columns) that essentially just moves the block
    // should be just as wide as the reference (first) block.
    QTextLayout *blockLayout = m_doc->begin().layout();
    QCOMPARE(blockLayout->lineAt(0).width(), 200.0);

    blockLayout = m_doc->begin().next().layout();
    QCOMPARE(blockLayout->lineAt(0).width(), 200.0);
    cleanupTest();
}

ParagraphFragment::ParagraphFragment(KShape *shape, const QTextBlock &textBlock, KParagraphStyle *style)
        : m_shape(shape)
{
    QTextLayout *layout = textBlock.layout();

    m_isSingleLine = (layout->lineCount() == 1);

    // border rectangle left and right
    m_border.setLeft(0.0);
    m_border.setRight(shape->size().width());

    // first line rectangle
    m_firstLine = layout->lineAt(0).rect();
    m_firstLine.setRight(m_border.right() - style->rightMargin());

    // counter rectangle
    KTextBlockData *blockData = static_cast<KTextBlockData*>(textBlock.userData());
    if (blockData != NULL) {
        m_counter = QRectF(blockData->counterPosition(), QSizeF(blockData->counterWidth() - blockData->counterSpacing(), m_firstLine.height()));
    }

    // following lines rectangle
    if (!m_isSingleLine) {
        m_followingLines = QRectF(layout->lineAt(1).rect().topLeft(), layout->lineAt(layout->lineCount() - 1).rect().bottomRight());
    } else {
        m_followingLines = m_firstLine;
    }

    // border rectangle top and bottom
    m_border.setTop(m_firstLine.top() - style->topMargin());
    m_border.setBottom(m_isSingleLine ? m_firstLine.bottom() + style->bottomMargin() : m_followingLines.bottom() + style->bottomMargin());

    // TODO: the lines overlap slightly so right now we simply
    // calculate the mean of the two y-values, should be handled properly
    if (!m_isSingleLine) {
        qreal lineBreak((m_firstLine.bottom() + m_followingLines.top()) / 2.0);
        m_firstLine.setBottom(lineBreak);
        m_counter.setBottom(lineBreak);
        m_followingLines.setTop(lineBreak);
    }
}

void TestSections::testShrinkByMargin()
{
    KSectionStyle *sectionStyle = new KSectionStyle();
    Q_ASSERT(sectionStyle);
    sectionStyle->setLeftMargin(20.0);
    sectionStyle->setRightMargin(20.0);

    initTest(sectionStyle);

    m_layout->layout();

    // a block in a section with margins (and no columns) should be exact amoung less wide
    // as the reference (first) block.
    QTextLayout *blockLayout = m_doc->begin().layout();
    QCOMPARE(blockLayout->lineAt(0).width(), 200.0);

    blockLayout = m_doc->begin().next().layout();
    QEXPECT_FAIL("", "unimplemented", Abort);
    QCOMPARE(blockLayout->lineAt(0).width(), 160.0);
    cleanupTest();
}

qreal TextDocumentLayout::blockWidth(const QTextBlock &block)
{
    QTextLayout *layout = block.layout();
    if (!layout->lineCount())
        return 0; // only for layouted blocks
    qreal blockWidth = 0;
    for (int i = 0; i < layout->lineCount(); ++i) {
        QTextLine line = layout->lineAt(i);
        blockWidth = qMax(line.naturalTextWidth() + 8, blockWidth);
    }
    return blockWidth;
}

void TestTableLayout::testColumnWidthUndefined()
{
    setupTest("","","","","","");
    m_layout->layout();

    QCOMPARE(m_table->columns(), 3);
    QCOMPARE(m_table->rows(), 3);
    QVERIFY(qAbs(m_block.layout()->lineAt(0).width() - 200.0) < ROUNDING);
    QTextLayout *lay = bottomLeftCellBlock().layout();
    QVERIFY(lay);
    QCOMPARE(lay->lineCount(), 1);
    QVERIFY(qAbs(lay->lineAt(0).width() - 200.0/3) < ROUNDING);
    lay = bottomMidCellBlock().layout();
    QVERIFY(lay);
    QCOMPARE(lay->lineCount(), 1);
    QVERIFY(qAbs(lay->lineAt(0).width() - 200.0/3) < ROUNDING);
    lay = bottomRightCellBlock().layout();
    QVERIFY(lay);
    QCOMPARE(lay->lineCount(), 1);
    QVERIFY(qAbs(lay->lineAt(0).width() - 200.0/3) < ROUNDING);
}

void TextLabel::drawTextLayout(QPainter *painter, const QTextLayout &layout, const QRect &rect)
{
    if (rect.width() < 1 || rect.height() < 1) {
        return;
    }

    QPixmap pixmap(rect.size());
    pixmap.fill(Qt::transparent);

    QPainter p(&pixmap);
    p.setPen(painter->pen());

    // Create the alpha gradient for the fade out effect
    QLinearGradient alphaGradient(0, 0, 1, 0);
    alphaGradient.setCoordinateMode(QGradient::ObjectBoundingMode);
    if (layout.textOption().textDirection() == Qt::LeftToRight) {
        alphaGradient.setColorAt(0, QColor(0, 0, 0, 255));
        alphaGradient.setColorAt(1, QColor(0, 0, 0, 0));
    } else {
        alphaGradient.setColorAt(0, QColor(0, 0, 0, 0));
        alphaGradient.setColorAt(1, QColor(0, 0, 0, 255));
    }

    QFontMetrics fm(layout.font());
    int textHeight = layout.lineCount() * fm.lineSpacing();

    QPointF position(0, (rect.height() - textHeight) / 2);
    QList<QRect> fadeRects;
    int fadeWidth = 30;

    // Draw each line in the layout
    for (int i = 0; i < layout.lineCount(); i++) {
        QTextLine line = layout.lineAt(i);
        line.draw(&p, position);

        // Add a fade out rect to the list if the line is too long
        if (line.naturalTextWidth() > rect.width())
        {
            int x = int(qMin(line.naturalTextWidth(), (qreal)pixmap.width())) - fadeWidth;
            int y = int(line.position().y() + position.y());
            QRect r = QStyle::visualRect(layout.textOption().textDirection(), pixmap.rect(),
                                         QRect(x, y, fadeWidth, int(line.height())));
            fadeRects.append(r);
        }
    }

    // Reduce the alpha in each fade out rect using the alpha gradient
    if (!fadeRects.isEmpty()) {
        p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
        foreach (const QRect &rect, fadeRects) {
            p.fillRect(rect, alphaGradient);
        }