C++ QTextLayout::setTextOption方法代码示例

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 TestDocumentLayout::placeAnchoredFrame()
{
    initForNewTest(QString());
    MockShape *picture = new MockShape();
    picture->setSize(QSizeF(100, 100));
    KTextAnchor *anchor = new KTextAnchor(picture);
    anchor->setOffset(QPointF(23, 45));
    QTextCursor cursor(doc);

    KInlineTextObjectManager *manager = new KInlineTextObjectManager();
    layout->setInlineTextObjectManager(manager);
    MockLayoutState *state = new MockLayoutState(doc);
    layout->setLayout(state);
    state->shape = shape1;
    QCOMPARE(doc->begin().text().length(), 0);
    manager->insertInlineObject(cursor, anchor);
    QCOMPARE(doc->begin().text().length(), 1);
    QCOMPARE(cursor.position(), 1);

    shape1->setPosition(QPointF(300, 300));
    layout->layout();
    QCOMPARE(picture->parent(), shape1);
    QCOMPARE(picture->position(), QPointF(23, 59.4));

    cursor.setPosition(0);
    cursor.insertText("foo"); // moves my anchors slightly to the right/down and gives line height
    layout->layout();
    QCOMPARE(picture->parent(), shape1);
    QPointF newPos = picture->position();
    QVERIFY(newPos.x() > 23);
    QVERIFY(newPos.y() > 45); // it adds the baseline now

    cursor.movePosition(QTextCursor::End);
    cursor.insertText("\nNew Line\nAnd another");

    layout->layout();
    QCOMPARE(picture->position(), newPos);

    QTextLayout *firstLineLayout = doc->begin().layout();
    QTextOption option = firstLineLayout->textOption();
    option.setAlignment(Qt::AlignHCenter);
    firstLineLayout->setTextOption(option);

    layout->layout();
    QTextLine first = doc->begin().layout()->lineAt(0);
    QVERIFY(first.isValid());
    QVERIFY(first.naturalTextRect().x() > 10);
    newPos.setX(newPos.x() + first.naturalTextRect().x()); // text is moved due to alignment
    QCOMPARE(picture->position(), newPos);

    anchor->setOffset(QPointF());
    anchor->setAlignment(KTextAnchor::Left);
    anchor->setAlignment(KTextAnchor::TopOfParagraph);
    layout->layout();
    // image is 100 wide, now centered in a parent of 200 so X = 50
    QCOMPARE(picture->position(), QPointF(50, 0));
}

static QSize viewItemTextSize ( const QStyleOptionViewItemV4 *option )
{
	QStyle *style = option->widget ? option->widget->style() : QApplication::style();
	QTextOption textOption;
	textOption.setWrapMode ( QTextOption::WrapAtWordBoundaryOrAnywhere );
	QTextLayout textLayout;
	textLayout.setTextOption ( textOption );
	textLayout.setFont ( option->font );
	textLayout.setText ( option->text );
	const int textMargin = style->pixelMetric ( QStyle::PM_FocusFrameHMargin, option, option->widget ) + 1;
	QRect bounds ( 0,0,100 - 2*textMargin,600 );
	qreal height = 0, widthUsed = 0;
	viewItemTextLayout ( textLayout, bounds.width(), height, widthUsed );
	const QSize size ( qCeil ( widthUsed ), qCeil ( height ) );
	return QSize ( size.width() + 2 * textMargin, size.height() );
}

void QStaticTextPrivate::paintText(const QPointF &topLeftPosition, QPainter *p)
{
    bool preferRichText = textFormat == Qt::RichText
                          || (textFormat == Qt::AutoText && Qt::mightBeRichText(text));

    if (!preferRichText) {
        QTextLayout textLayout;
        textLayout.setText(text);
        textLayout.setFont(font);
        textLayout.setTextOption(textOption);

        qreal leading = QFontMetricsF(font).leading();
        qreal height = -leading;

        textLayout.beginLayout();
        while (1) {
            QTextLine line = textLayout.createLine();
            if (!line.isValid())
                break;

            if (textWidth >= 0.0)
                line.setLineWidth(textWidth);
            height += leading;
            line.setPosition(QPointF(0.0, height));
            height += line.height();
        }
        textLayout.endLayout();

        actualSize = textLayout.boundingRect().size();
        textLayout.draw(p, topLeftPosition);
    } else {
        QTextDocument document;
#ifndef QT_NO_CSSPARSER
        QColor color = p->pen().color();
        document.setDefaultStyleSheet(QString::fromLatin1("body { color: #%1%2%3 }")
                                      .arg(QString::number(color.red(), 16), 2, QLatin1Char('0'))
                                      .arg(QString::number(color.green(), 16), 2, QLatin1Char('0'))
                                      .arg(QString::number(color.blue(), 16), 2, QLatin1Char('0')));
#endif
        document.setDefaultFont(font);
        document.setDocumentMargin(0.0);        
#ifndef QT_NO_TEXTHTMLPARSER
        document.setHtml(text);
#else
        document.setPlainText(text);
#endif
        if (textWidth >= 0.0)
            document.setTextWidth(textWidth);
        else
            document.adjustSize();
        document.setDefaultTextOption(textOption);

        p->save();
        p->translate(topLeftPosition);
        QAbstractTextDocumentLayout::PaintContext ctx;
        ctx.palette.setColor(QPalette::Text, p->pen().color());
        document.documentLayout()->draw(p, ctx);
        p->restore();

        if (textWidth >= 0.0)
            document.adjustSize(); // Find optimal size

        actualSize = document.size();
    }
}

void TextDocumentLayout::layoutBlock(const QTextBlock &block)
{
    QTextDocument *doc = document();
    qreal margin = doc->documentMargin();
    qreal blockMaximumWidth = 0;

    qreal height = 0;
    QTextLayout *tl = block.layout();
    QTextOption option = doc->defaultTextOption();
    tl->setTextOption(option);

    int extraMargin = 0;
    if (option.flags() & QTextOption::AddSpaceForLineAndParagraphSeparators) {
        QFontMetrics fm(block.charFormat().font());
        extraMargin += fm.width(QChar(0x21B5));
    }
    tl->beginLayout();
    qreal availableWidth = d->width;
    if (availableWidth <= 0) {
        availableWidth = qreal(INT_MAX); // similar to text edit with pageSize.width == 0
    }
    availableWidth -= 2*margin + extraMargin;
    qreal indentMargin = 0;
    while (1) {
        QTextLine line = tl->createLine();
        if (!line.isValid())
            break;
        line.setLeadingIncluded(true);
        line.setLineWidth(availableWidth - indentMargin);
        line.setPosition(QPointF(margin + indentMargin, height));
        if(!height) //enter only in the first iteration
        {
            indentMargin = indentWidth(block);
        }
        height += line.height();
        blockMaximumWidth = qMax(blockMaximumWidth, line.naturalTextWidth() + 2*margin);
    }
    tl->endLayout();

    int previousLineCount = doc->lineCount();
    const_cast<QTextBlock&>(block).setLineCount(block.isVisible() ? tl->lineCount() : 0);
    int lineCount = doc->lineCount();

    bool emitDocumentSizeChanged = previousLineCount != lineCount;
    if (blockMaximumWidth > d->maximumWidth) {
        // new longest line
        d->maximumWidth = blockMaximumWidth;
        d->maximumWidthBlockNumber = block.blockNumber();
        emitDocumentSizeChanged = true;
    } else if (block.blockNumber() == d->maximumWidthBlockNumber && blockMaximumWidth < d->maximumWidth) {
        // longest line shrinking
        QTextBlock b = doc->firstBlock();
        d->maximumWidth = 0;
        QTextBlock maximumBlock;
        while (b.isValid()) {
            qreal blockMaximumWidth = blockWidth(b);
            if (blockMaximumWidth > d->maximumWidth) {
                d->maximumWidth = blockMaximumWidth;
                maximumBlock = b;
            }
            b = b.next();
        }
        if (maximumBlock.isValid()) {
            d->maximumWidthBlockNumber = maximumBlock.blockNumber();
            emitDocumentSizeChanged = true;
        }
    }
    if (emitDocumentSizeChanged)// && !d->blockDocumentSizeChanged)
        emit documentSizeChanged(documentSize());

    emit updateBlock(block);
}

//.........这里部分代码省略.........
	
	textHighlightRect.adjust ( 0,iconSize + 5,0,0 );

	// draw background
	{
		QSize textSize = viewItemTextSize ( &opt );
		QPalette::ColorGroup cg;
		QStyleOptionViewItemV4 opt2(opt);
		
		if((opt.widget && opt.widget->isEnabled()) || (opt.state & QStyle::State_Enabled))
		{
			if(! ( opt.state & QStyle::State_Active ))
				cg = QPalette::Inactive;
			else
				cg = QPalette::Normal;
		}
		else
		{
			cg = QPalette::Disabled;
		}
		opt2.palette.setCurrentColorGroup(cg);
		
		// fill in background, if any
		if ( opt.backgroundBrush.style() != Qt::NoBrush )
		{
			QPointF oldBO = painter->brushOrigin();
			painter->setBrushOrigin ( opt.rect.topLeft() );
			painter->fillRect ( opt.rect, opt.backgroundBrush );
			painter->setBrushOrigin ( oldBO );
		}
		
		if ( opt.showDecorationSelected )
		{
			drawSelectionRect(painter,opt2, opt.rect);
			drawFocusRect(painter,opt2, opt.rect);
			//painter->fillRect ( opt.rect, opt.palette.brush ( cg, QPalette::Highlight ) );
		}
		else
		{
			
			//if ( opt.state & QStyle::State_Selected )
			{
				//QRect textRect = subElementRect ( QStyle::SE_ItemViewItemText,  opt, opt.widget );
				//painter->fillRect ( textHighlightRect, opt.palette.brush ( cg, QPalette::Highlight ) );
				drawSelectionRect(painter,opt2, textHighlightRect);
				drawFocusRect(painter,opt2, textHighlightRect);
			}
		}
	}

	// draw the icon
	{
		QIcon::Mode mode = QIcon::Normal;
		if ( ! ( opt.state & QStyle::State_Enabled ) )
			mode = QIcon::Disabled;
		else if ( opt.state & QStyle::State_Selected )
			mode = QIcon::Selected;
		QIcon::State state = opt.state & QStyle::State_Open ? QIcon::On : QIcon::Off;

		iconbox.setHeight ( iconSize );
		opt.icon.paint ( painter, iconbox, Qt::AlignCenter, mode, state );
	}
	// set the text colors
	QPalette::ColorGroup cg = opt.state & QStyle::State_Enabled ? QPalette::Normal : QPalette::Disabled;
	if ( cg == QPalette::Normal && ! ( opt.state & QStyle::State_Active ) )
		cg = QPalette::Inactive;
	if ( opt.state & QStyle::State_Selected )
	{
		painter->setPen ( opt.palette.color ( cg, QPalette::HighlightedText ) );
	}
	else
	{
		painter->setPen ( opt.palette.color ( cg, QPalette::Text ) );
	}

	// draw the text
	QTextOption textOption;
	textOption.setWrapMode ( QTextOption::WrapAtWordBoundaryOrAnywhere );
	textOption.setTextDirection ( opt.direction );
	textOption.setAlignment ( QStyle::visualAlignment ( opt.direction, opt.displayAlignment ) );
	QTextLayout textLayout;
	textLayout.setTextOption ( textOption );
	textLayout.setFont ( opt.font );
	textLayout.setText ( opt.text );

	qreal width, height;
	viewItemTextLayout ( textLayout, iconbox.width(), height, width );

	const int lineCount = textLayout.lineCount();

	const QRect layoutRect = QStyle::alignedRect ( opt.direction, opt.displayAlignment, QSize ( iconbox.width(), int ( height ) ), textRect );
	const QPointF position = layoutRect.topLeft();
	for ( int i = 0; i < lineCount; ++i )
	{
		const QTextLine line = textLayout.lineAt ( i );
		line.draw ( painter, position );
	}

	painter->restore();
}

// copied from QItemDelegate to be able to add the 'format' parameter
void HighlightingItemDelegate::drawDisplay(QPainter *painter,
                                           const QStyleOptionViewItem &option,
                                           const QRect &rect, const QString &text,
                                           const QVector<QTextLayout::FormatRange> &format) const
{
    QPalette::ColorGroup cg = option.state & QStyle::State_Enabled
                              ? QPalette::Normal : QPalette::Disabled;
    if (cg == QPalette::Normal && !(option.state & QStyle::State_Active))
        cg = QPalette::Inactive;
    if (option.state & QStyle::State_Selected) {
        painter->fillRect(rect, option.palette.brush(cg, QPalette::Highlight));
        painter->setPen(option.palette.color(cg, QPalette::HighlightedText));
    } else {
        painter->setPen(option.palette.color(cg, QPalette::Text));
    }

    if (text.isEmpty())
        return;

    if (option.state & QStyle::State_Editing) {
        painter->save();
        painter->setPen(option.palette.color(cg, QPalette::Text));
        painter->drawRect(rect.adjusted(0, 0, -1, -1));
        painter->restore();
    }

    const QStyleOptionViewItem opt = option;

    const QWidget *widget = option.widget;
    QStyle *style = widget ? widget->style() : QApplication::style();
    const int textMargin = style->pixelMetric(QStyle::PM_FocusFrameHMargin, nullptr, widget) + 1;
    QRect textRect = rect.adjusted(textMargin, 0, -textMargin, 0); // remove width padding
    const bool wrapText = opt.features & QStyleOptionViewItem::WrapText;
    QTextOption textOption;
    textOption.setWrapMode(wrapText ? QTextOption::WordWrap : QTextOption::ManualWrap);
    textOption.setTextDirection(option.direction);
    textOption.setAlignment(QStyle::visualAlignment(option.direction, option.displayAlignment));
    QTextLayout textLayout;
    textLayout.setTextOption(textOption);
    textLayout.setFont(option.font);
    textLayout.setText(replaceNewLine(text));

    QSizeF textLayoutSize = doTextLayout(&textLayout, textRect.width());

    if (textRect.width() < textLayoutSize.width()
        || textRect.height() < textLayoutSize.height()) {
        QString elided;
        int start = 0;
        int end = text.indexOf(QChar::LineSeparator, start);
        if (end == -1) {
            elided += option.fontMetrics.elidedText(text, option.textElideMode, textRect.width());
        } else {
            while (end != -1) {
                elided += option.fontMetrics.elidedText(text.mid(start, end - start),
                                                        option.textElideMode, textRect.width());
                elided += QChar::LineSeparator;
                start = end + 1;
                end = text.indexOf(QChar::LineSeparator, start);
            }
            // let's add the last line (after the last QChar::LineSeparator)
            elided += option.fontMetrics.elidedText(text.mid(start),
                                                    option.textElideMode, textRect.width());
        }
        textLayout.setText(elided);
        textLayoutSize = doTextLayout(&textLayout, textRect.width());
    }

    const QSize layoutSize(textRect.width(), int(textLayoutSize.height()));
    const QRect layoutRect = QStyle::alignedRect(option.direction, option.displayAlignment,
                                                  layoutSize, textRect);
    // if we still overflow even after eliding the text, enable clipping
    if (!hasClipping() && (textRect.width() < textLayoutSize.width()
                           || textRect.height() < textLayoutSize.height())) {
        painter->save();
        painter->setClipRect(layoutRect);
        textLayout.draw(painter, layoutRect.topLeft(), format, layoutRect);
        painter->restore();
    } else {
        textLayout.draw(painter, layoutRect.topLeft(), format, layoutRect);
    }
}