C++ QTextLayout::position方法代码示例

void LineNumberWidget::paintEvent(QPaintEvent *){
	int contentsY = editor->verticalScrollBar()->value();
	qreal pageBottom = contentsY + editor->viewport()->height();
	int lineNumber = 1;
	const QFontMetrics fm = fontMetrics();
	const int ascent = fontMetrics().ascent() + 1; // height = ascent + descent + 1

	QPainter p(this);

	for (QTextBlock block = editor->document()->begin();block.isValid();block = block.next(), ++lineNumber) {
		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;

		const QString txt = QString::number(lineNumber);
		p.drawText(width() - fm.width(txt), qRound(position.y()) - contentsY + ascent, txt);
		}
	}

void BoxBuilder::build(const QTextDocument* doc,const QSize& pixmapSize, const QColor& glyphColor)
{
	pixmap_ = QPixmap(pixmapSize);
	pixmap_.fill(Qt::white);

	glyphPen_ = QPen(glyphColor);
		
	boxes_.clear();
	for(QTextBlock block = doc->begin();block!=doc->end();block=block.next())
	{
		//log_ << "BLOCK has started" << std::endl;
		QTextLayout* tl = block.layout();
		QString blockText = block.text();

			
		QList<QGlyphRun> glyphs = tl->glyphRuns();		
		
		int glyphsNum = 0;
		std::for_each(glyphs.begin(),glyphs.end(),[&glyphsNum](QGlyphRun grun)
		{
			glyphsNum += grun.glyphIndexes().size();
		});

		if(glyphsNum != blockText.length())
			log_ << " the number of glyphs in the layout differs with text length, the numbers are: " <<
			glyphsNum << " and " << blockText.length() << std::endl;
		
		glyphPosition_ = tl->position();		
		blockText_ = blockText;
			
		std::for_each(	glyphs.begin(),
						glyphs.end(),
						[this](const QGlyphRun& grun)
						{handleGlyphRun_(grun);});
	}
	
}

void TextLineNumbers::paintEvent( QPaintEvent* )
{
	int contentsY = m_textEdit->verticalScrollBar()->value();
	qreal pageBottom = contentsY + m_textEdit->viewport()->height();
	int m_lineNumber = 1;
	const QFontMetrics fm = fontMetrics();
	const int ascent = fontMetrics().ascent() +1;
	
	QPainter p( this );
	for ( QTextBlock block = m_textEdit->document()->begin(); block.isValid(); block = block.next(), m_lineNumber++ )
	{
		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;
		const QString txt = QString::number( m_lineNumber - 1 );
		
		p.drawText( width() -fm.width( txt ) - 2, qRound( position.y() ) -contentsY +ascent, txt ); // -fm.width( "0" ) is an ampty place/indent 		
	}
	p.end();
}

void TextLayer::recreateTexture(VidgfxContext *gfx)
{
	if(!m_isTexDirty)
		return; // Don't waste any time if it hasn't changed
	m_isTexDirty = false;

	// Delete existing texture if one exists
	if(m_texture != NULL)
		vidgfx_context_destroy_tex(gfx, m_texture);
	m_texture = NULL;

	// Determine texture size. We need to keep in mind that the text in the
	// document might extend outside of the layer's bounds.
	m_document.setTextWidth(m_rect.width());
	QSize size(
		(int)ceilf(m_document.size().width()),
		(int)ceilf(m_document.size().height()));

	if(m_document.isEmpty() || size.isEmpty()) {
		// Nothing to display
		return;
	}

	// Create temporary canvas. We need to be careful here as text is rendered
	// differently on premultiplied vs non-premultiplied pixel formats. On a
	// premultiplied format text is rendered with subpixel rendering enabled
	// while on a non-premultiplied format it is not. As we don't want subpixel
	// rendering we use the standard ARGB32 format.
	QSize imgSize(
		size.width() + m_strokeSize * 2, size.height() + m_strokeSize * 2);
	QImage img(imgSize, QImage::Format_ARGB32);
	img.fill(Qt::transparent);
	QPainter p(&img);
	p.setRenderHint(QPainter::Antialiasing, true);

	// Render text
	//m_document.drawContents(&p);

	// Render stroke
	if(m_strokeSize > 0) {
#define STROKE_TECHNIQUE 0
#if STROKE_TECHNIQUE == 0
		// Technique 0: Use QTextDocument's built-in text outliner
		//quint64 timeStart = App->getUsecSinceExec();

		QTextDocument *outlineDoc = m_document.clone(this);

		QTextCharFormat format;
		QPen pen(m_strokeColor, (double)(m_strokeSize * 2));
		pen.setJoinStyle(Qt::RoundJoin);
		format.setTextOutline(pen);
		QTextCursor cursor(outlineDoc);
		cursor.select(QTextCursor::Document);
		cursor.mergeCharFormat(format);

		// Take into account the stroke offset
		p.translate(m_strokeSize, m_strokeSize);

		//quint64 timePath = App->getUsecSinceExec();
		outlineDoc->drawContents(&p);
		delete outlineDoc;

		//quint64 timeEnd = App->getUsecSinceExec();
		//appLog() << "Path time = " << (timePath - timeStart) << " usec";
		//appLog() << "Render time = " << (timeEnd - timePath) << " usec";
		//appLog() << "Full time = " << (timeEnd - timeStart) << " usec";
#elif STROKE_TECHNIQUE == 1
		// Technique 1: Create a text QPainterPath and stroke it
		quint64 timeStart = App->getUsecSinceExec();

		// Create the path for the text's stroke
		QPainterPath path;
		QTextBlock &block = m_document.firstBlock();
		int numBlocks = m_document.blockCount();
		for(int i = 0; i < numBlocks; i++) {
			QTextLayout *layout = block.layout();
			for(int j = 0; j < layout->lineCount(); j++) {
				QTextLine &line = layout->lineAt(j);
				const QString text = block.text().mid(
					line.textStart(), line.textLength());
				QPointF pos = layout->position() + line.position();
				pos.ry() += line.ascent();
				//appLog() << pos << ": " << text;
				path.addText(pos, block.charFormat().font(), text);
			}
			block = block.next();
		}

		quint64 timePath = App->getUsecSinceExec();
		path = path.simplified(); // Fixes gaps with large stroke sizes
		quint64 timeSimplify = App->getUsecSinceExec();

		// Render the path
		//p.strokePath(path, QPen(m_strokeColor, m_strokeSize));

		// Convert it to a stroke
		QPainterPathStroker stroker;
		stroker.setWidth(m_strokeSize);
		//stroker.setCurveThreshold(2.0);
		stroker.setJoinStyle(Qt::RoundJoin);
//.........这里部分代码省略.........

void Text::layout()
      {
#if 0
      QSizeF pageSize(-1.0, 1000000);
      setPos(0.0, 0.0);
      if (parent() && _layoutToParentWidth) {
            pageSize.setWidth(parent()->width());
            if (parent()->type() == HBOX || parent()->type() == VBOX || parent()->type() == TBOX) {
                  Box* box = static_cast<Box*>(parent());
                  rxpos() += box->leftMargin() * DPMM;
                  rypos() += box->topMargin() * DPMM;
                  // pageSize.setHeight(box->height() - (box->topMargin() + box->bottomMargin()) * DPMM);
                  pageSize.setWidth(box->width()   - (box->leftMargin() + box->rightMargin()) * DPMM);
                  }
            }

      QTextOption to = _doc->defaultTextOption();
      to.setUseDesignMetrics(true);
      to.setWrapMode(pageSize.width() <= 0.0 ? QTextOption::NoWrap : QTextOption::WrapAtWordBoundaryOrAnywhere);
      _doc->setDefaultTextOption(to);

      if (pageSize.width() <= 0.0)
            _doc->setTextWidth(_doc->idealWidth());
      else
            _doc->setPageSize(pageSize);

      if (hasFrame()) {
            frame = QRectF();
            for (QTextBlock tb = _doc->begin(); tb.isValid(); tb = tb.next()) {
                  QTextLayout* tl = tb.layout();
                  int n = tl->lineCount();
                  for (int i = 0; i < n; ++i)
                        // frame |= tl->lineAt(0).naturalTextRect().translated(tl->position());
                        frame |= tl->lineAt(0).rect().translated(tl->position());
                  }
            if (circle()) {
                  if (frame.width() > frame.height()) {
                        frame.setY(frame.y() + (frame.width() - frame.height()) * -.5);
                        frame.setHeight(frame.width());
                        }
                  else {
                        frame.setX(frame.x() + (frame.height() - frame.width()) * -.5);
                        frame.setWidth(frame.height());
                        }
                  }
            qreal w = (paddingWidth() + frameWidth() * .5) * DPMM;
            frame.adjust(-w, -w, w, w);
            w = frameWidth() * DPMM;
            _bbox = frame.adjusted(-w, -w, w, w);
            }
      else {
            _bbox = QRectF(QPointF(0.0, 0.0), _doc->size()); //_doc->documentLayout()->frameBoundingRect(_doc->rootFrame());
            }
      _doc->setModified(false);
      style().layout(this);      // process alignment

      if ((style().align() & ALIGN_VCENTER) && (subtype() == TEXT_TEXTLINE)) {
            // special case: vertically centered text with TextLine needs to
            // take into account the line width
            TextLineSegment* tls = (TextLineSegment*)parent();
            TextLine* tl = (TextLine*)(tls->line());
            qreal textlineLineWidth = point(tl->lineWidth());
            rypos() -= textlineLineWidth * .5;
            }

      if (parent() == 0)
            return;
      if (parent()->type() == SEGMENT) {
            Segment* s = static_cast<Segment*>(parent());
            rypos() += s ? s->measure()->system()->staff(staffIdx())->y() : 0.0;
            }
#endif
      Font f = style().font(spatium());
      qreal asc, desc, leading;
      qreal w = textMetrics(f.family(), _text, f.size(), &asc, &desc, &leading);

// printf("text(%s) asc %f desc %f leading %f  w %f\n", qPrintable(_text), asc, desc, leading, w);
      _lineHeight  = asc + desc;
      _lineSpacing = _lineHeight + leading;
      _baseLine    = asc;

      setbbox(QRectF(0.0, -asc, w, _lineHeight));
#if 0
      if (parent() && _layoutToParentWidth) {
            qreal wi = parent()->width();
            qreal ph = parent()->height();
            qreal x;
            qreal y = pos.y();
            if (align() & ALIGN_HCENTER)
                  x = (wi - w) * .5;
            else if (align() & ALIGN_RIGHT)
                  x = wi - w;
            else
                  x = 0.0;
            if (align() & ALIGN_VCENTER)
                  y = (ph - asc) * .5;
            else if (align() & ALIGN_BOTTOM)
                  y = ph - asc;
            else
                  y = asc;
//.........这里部分代码省略.........