C++ QTextBlock::layout方法代码示例

void KTextDocumentLayout::Private::adjustSize()
{
    if (parent->resizeMethod() == KTextDocument::NoResize)
        return;

    if (parent->shapes().isEmpty())
        return;
    // Limit auto-resizing to the first shape only (there won't be more
    // with auto-resizing turned on, unless specifically set)
    KShape *shape = parent->shapes().first();

    // Determine the maximum width of all text lines
    qreal width = 0;
    for (QTextBlock block = parent->document()->begin(); block.isValid(); block = block.next()) {
        // The block layout's wrap mode must be QTextOption::NoWrap, thus the line count
        // of a valid block must be 1 (otherwise this resizing scheme wouldn't work)
        Q_ASSERT(block.layout()->lineCount() == 1);
        QTextLine line = block.layout()->lineAt(0);
        width = qMax(width, line.naturalTextWidth());
    }

    // Use position and height of last text line to calculate height
    QTextLine line = parent->document()->lastBlock().layout()->lineAt(0);
    qreal height = line.position().y() + line.height();

    shape->setSize(QSizeF(width, height));
}

static void calculateBoundingRect( QTextDocument *document, int startPosition, int endPosition,
                                   QRectF &rect )
{
    const QTextBlock startBlock = document->findBlock( startPosition );
    const QRectF startBoundingRect = document->documentLayout()->blockBoundingRect( startBlock );

    const QTextBlock endBlock = document->findBlock( endPosition );
    const QRectF endBoundingRect = document->documentLayout()->blockBoundingRect( endBlock );

    QTextLayout *startLayout = startBlock.layout();
    QTextLayout *endLayout = endBlock.layout();

    int startPos = startPosition - startBlock.position();
    int endPos = endPosition - endBlock.position();
    const QTextLine startLine = startLayout->lineForTextPosition( startPos );
    const QTextLine endLine = endLayout->lineForTextPosition( endPos );

    double x = startBoundingRect.x() + startLine.cursorToX( startPos );
    double y = startBoundingRect.y() + startLine.y();
    double r = endBoundingRect.x() + endLine.cursorToX( endPos );
    double b = endBoundingRect.y() + endLine.y() + endLine.height();

    const QSizeF size = document->size();
    rect = QRectF( x / size.width(), y / size.height(),
                   (r - x) / size.width(), (b - y) / size.height() );
}

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 KPrAttributeHeight::updateCache(KPrAnimationCache *cache, KPrShapeAnimation *shapeAnimation, qreal value)
{
    qreal tx = 0.0, ty = 0.0;
    KoShape * shape = shapeAnimation->shape();
    KoTextBlockData * textBlockData = shapeAnimation->textBlockData();
    QTransform transform;
    if (textBlockData) {
        if (KoTextShapeData *textShapeData = dynamic_cast<KoTextShapeData*>(shape->userData())) {
            QTextDocument *textDocument = textShapeData->document();
            for (int i = 0; i < textDocument->blockCount(); i++) {
                QTextBlock textBlock = textDocument->findBlockByNumber(i);
                if (textBlock.userData() == textBlockData) {
                    QTextLayout *layout = textBlock.layout();
                    value = value * cache->pageSize().height() / layout->boundingRect().height();
                    tx = layout->minimumWidth() * cache->zoom() / 2;
                    ty = layout->boundingRect().height() * cache->zoom() / 2;
                }
            }
        }
    }
    else {
        value = value * cache->pageSize().height() / shape->size().height();
        tx = shape->size().width() * cache->zoom() / 2;
        ty = shape->size().height() * cache->zoom() / 2;
    }
    transform.translate(tx, ty).scale(1, value).translate(-tx, -ty);
    cache->update(shape, shapeAnimation->textBlockData(), "transform", transform);
}

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());

}

void TestDocumentLayout::testRightToLeftList()
{
    initForNewTest("a\nb\nc");
    KoParagraphStyle h1;
    h1.setTextProgressionDirection(KoText::RightLeftTopBottom);
    m_styleManager->add(&h1);
    KoListStyle listStyle;
    KoListLevelProperties llp = listStyle.levelProperties(1);
    llp.setStyle(KoListStyle::DecimalItem);
    listStyle.setLevelProperties(llp);
    h1.setListStyle(&listStyle);

    QTextBlock block = m_doc->begin();
    h1.applyStyle(block);
    block = block.next();
    h1.applyStyle(block);
    block = block.next();
    h1.applyStyle(block);
    block = block.next();

    m_layout->layout();

    block = m_doc->begin();
    while (block.isValid()) {
        KoTextBlockData *data = dynamic_cast<KoTextBlockData *>(block.userData());
        QVERIFY(data);
        QVERIFY(data->counterWidth() > 2);
        QVERIFY(data->counterPosition().x() > 100);
        QTextLine line = block.layout()->lineAt(0);
        QVERIFY(line.isValid());
        QCOMPARE(line.x(), (qreal)0);
        QCOMPARE(line.width() + data->counterWidth() + data->counterSpacing(), (qreal)200);
        block = block.next();
    }
}

void TestDocumentLayout::initForNewTest(const QString &initText)
{
    // this leaks memory like mad, but who cares ;)
    frameSet = new KWTextFrameSet(0);
    shape1 = new MockTextShape();
    shape1->setSize(QSizeF(200, 1000));
    new KWTextFrame(shape1, frameSet);
    doc = frameSet->document();
    Q_ASSERT(doc);
    layout = dynamic_cast<KWTextDocumentLayout*>(doc->documentLayout());
    Q_ASSERT(layout);
    styleManager = new KStyleManager();
    KTextDocument(doc).setStyleManager(styleManager);

    QTextBlock block = doc->begin();
    if (initText.length() > 0) {
        QTextCursor cursor(doc);
        cursor.insertText(initText);
        KParagraphStyle style;
        style.setStyleId(101); // needed to do manually since we don't use the stylemanager
        QTextBlock b2 = doc->begin();
        while (b2.isValid()) {
            style.applyStyle(b2);
            b2 = b2.next();
        }
    }
    blockLayout = block.layout();
}

void TextDocumentModel::fillBlock(const QTextBlock &block, QStandardItem *parent)
{
    for (auto it = block.begin(); it != block.end(); ++it) {
        QStandardItem *item = new QStandardItem(tr("Fragment: %1").arg(it.fragment().text()));
        const QRectF b = m_document->documentLayout()->blockBoundingRect(block);
        appendRow(parent, item, it.fragment().charFormat(), b);
        if (!block.layout())
            continue;
#if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
        foreach (const auto &range, block.layout()->formats()) {
            const auto start = std::max(range.start, it.fragment().position() - block.position());
            const auto end = std::min(range.start + range.length,
                                      it.fragment().position() + it.fragment().length()
                                      - block.position());
            if (start >= end)
                continue;
            auto child
                = new QStandardItem(tr("Layout Range: %1").arg(it.fragment().text().mid(start,
                                                                                        end
                                                                                        -start)));
            appendRow(item, child, range.format, QRectF());
        }
#endif
    }
}

void KPrAttributeHeight::initCache(KPrAnimationCache *animationCache, int step, KPrShapeAnimation * shapeAnimation, qreal startValue, qreal endValue)
{
    qreal v1 = 0.0, v2 = 0.0, tx = 0.0, ty = 0.0;
    KoShape * shape = shapeAnimation->shape();
    KoTextBlockData * textBlockData = shapeAnimation->textBlockData();

    if (textBlockData) {
        if (KoTextShapeData *textShapeData = dynamic_cast<KoTextShapeData*>(shape->userData())) {
            QTextDocument *textDocument = textShapeData->document();
            for (int i = 0; i < textDocument->blockCount(); i++) {
                QTextBlock textBlock = textDocument->findBlockByNumber(i);
                if (textBlock.userData() == textBlockData) {
                    QTextLayout *layout = textBlock.layout();
                    v1 = startValue * animationCache->pageSize().height() / layout->boundingRect().height();
                    v2 = endValue * animationCache->pageSize().height() / layout->boundingRect().height();
                    tx = layout->minimumWidth() * animationCache->zoom() / 2;
                    ty = layout->boundingRect().height() * animationCache->zoom() / 2;
                }
            }
        }
    }
    else {
        v1 = startValue * animationCache->pageSize().height() / shape->size().height();
        v2 = endValue * animationCache->pageSize().height() / shape->size().height();
        tx = shape->size().width() * animationCache->zoom() / 2;
        ty = shape->size().height() * animationCache->zoom() / 2;
    }
    animationCache->init(step, shape, textBlockData, "transform", QTransform().translate(tx, ty).scale(1, v1).translate(-tx, -ty));
    animationCache->init(step + 1, shape, textBlockData, "transform", QTransform().translate(tx, ty).scale(1, v2).translate(-tx, -ty));
}

void CodeHighlighter::updateFormatting(QTextDocument* _document, CodeHighlighterSettings const& _settings)
{
	QTextBlock block = _document->firstBlock();
	QList<QTextLayout::FormatRange> ranges;

	Formats::const_iterator format = m_formats.begin();
	while (true)
	{
		while ((format == m_formats.end() || (block.position() + block.length() <= format->start)) && block.isValid())
		{
			auto layout = block.layout();
			layout->clearAdditionalFormats();
			layout->setAdditionalFormats(ranges);
			_document->markContentsDirty(block.position(), block.length());
			block = block.next();
			ranges.clear();
		}
		if (!block.isValid())
			break;

		int intersectionStart = std::max(format->start, block.position());
		int intersectionLength = std::min(format->start + format->length, block.position() + block.length()) - intersectionStart;
		if (intersectionLength > 0)
		{
			QTextLayout::FormatRange range;
			range.format = _settings.formats[format->token];
			range.start = format->start - block.position();
			range.length = format->length;
			ranges.append(range);
		}
		++format;
	}
}

/*!
    \fn QString QAbstractTextDocumentLayout::anchorAt(const QPointF &position) const

    Returns the reference of the anchor the given \a position, or an empty
    string if no anchor exists at that point.
*/
QString QAbstractTextDocumentLayout::anchorAt(const QPointF& pos) const
{
    int cursorPos = hitTest(pos, Qt::ExactHit);
    if (cursorPos == -1)
        return QString();

    // compensate for preedit in the hit text block
    QTextBlock block = document()->firstBlock();
    while (block.isValid()) {
        QRectF blockBr = blockBoundingRect(block);
        if (blockBr.contains(pos)) {
            QTextLayout *layout = block.layout();
            int relativeCursorPos = cursorPos - block.position();
            const int preeditLength = layout ? layout->preeditAreaText().length() : 0;
            if (preeditLength > 0 && relativeCursorPos > layout->preeditAreaPosition())
                cursorPos -= qMin(cursorPos - layout->preeditAreaPosition(), preeditLength);
            break;
        }
        block = block.next();
    }

    QTextDocumentPrivate *pieceTable = qobject_cast<const QTextDocument *>(parent())->docHandle();
    QTextDocumentPrivate::FragmentIterator it = pieceTable->find(cursorPos);
    QTextCharFormat fmt = pieceTable->formatCollection()->charFormat(it->format);
    return fmt.anchorHref();
}

void HGMarkdownHighlighter::clearFormatting()
{
    QTextBlock block = document->firstBlock();
    while (block.isValid()) {
        block.layout()->clearAdditionalFormats();
        block = block.next();
    }
}

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);
}

///Indique si on est à la dernière ligne
bool RzxTextEdit::atEnd() const
{
	QTextBlock block = textCursor().block();
	if(block.next().isValid()) return false;

	QTextLine line = currentTextLine();
	return line.isValid() && line.lineNumber() == block.layout()->lineCount() - 1;
}

void DevLineNumber::paintEvent(QPaintEvent *e)
{
	const QPixmap pm[] ={ 	
							QPixmap(":/break.png"),
							QPixmap(":/error.png")
						};
	
	int n = 1, contentsY = editor->verticalScrollBar()->value();
	qreal pageBottom = contentsY + editor->viewport()->height();
	const QFontMetrics fm( editor->document()->defaultFont() );
	
	QPainter p(this);
	
	for (QTextBlock block = editor->document()->begin();
		block.isValid(); 
		block = block.next(), ++n )
	{
		QTextLayout *layout = block.layout();
		
		const QRectF boundingRect = layout->boundingRect();
		QPointF position = layout->position();
		if (position.y() + boundingRect.height() < contentsY)
			continue;
		if (position.y() > pageBottom)
			break;
			
		int posY = qRound(position.y());
            
		BlockData *dat = BlockData::data(block);
		const QString txt = QString::number(n);
		
		p.drawText(	0,
					posY - contentsY,
					width(),
					fm.lineSpacing(),
					Qt::AlignRight | Qt::AlignVCenter,
					txt);
		
		if ( !dat )
			continue;
		
		int x = 0;
		
		if ( dat->s & BlockData::BreakPoint )
		p.drawPixmap(	15*(x++),
						posY - contentsY +(fm.lineSpacing() - (*pm).height())/2,
						(*pm).width(),
						(*pm).height(),
						*pm);
		
		if ( dat->s & BlockData::Error )
		p.drawPixmap(	15*(x++),
						posY - contentsY +(fm.lineSpacing() - pm[1].height())/2,
						pm[1].width(),
						pm[1].height(),
						pm[1]);
	}
}