C++ QTextImageFormat::isValid方法代码示例

void TextResultItem::setLatex(Cantor::LatexResult* result)
{
    QTextCursor cursor = textCursor();
    cursor.movePosition(QTextCursor::Start);
    cursor.movePosition(QTextCursor::End, QTextCursor::KeepAnchor);
    QString latex = result->toLatex().trimmed();
    if (latex.startsWith(QLatin1String("\\begin{eqnarray*}")) &&
        latex.endsWith(QLatin1String("\\end{eqnarray*}"))) {
        latex = latex.mid(17);
        latex = latex.left(latex.size() - 15);
    }
    if (result->isCodeShown()) {
        if (latex.isEmpty())
            cursor.removeSelectedText();
        else
            cursor.insertText(latex);
    } else {
        QTextImageFormat format;
        format = epsRenderer()->render(cursor.document(),
                                       result->data().toUrl());
        format.setProperty(EpsRenderer::CantorFormula,
                           EpsRenderer::LatexFormula);
        format.setProperty(EpsRenderer::Code, latex);
        format.setProperty(EpsRenderer::Delimiter, QLatin1String("$$"));
        if(format.isValid())
            cursor.insertText(QString(QChar::ObjectReplacementCharacter), format);
        else
            cursor.insertText(i18n("Cannot render Eps file. You may need additional packages"));
    }
}

void QTextBrowserEx::insertFromMimeData( const QMimeData *source )
{
	Q_ASSERT(source);

	if(m_pasteFlags == NotSupport)
		return;

	QByteArray bytes = source->data(KTextEditMime);

	KTextCursor tc = textCursor();

	if(!bytes.isEmpty() && m_pasteFlags.testFlag(Custom))
	{
		QDataStream ds(bytes);
		QList<QByteArray> lstFrags;
		ds >> lstFrags;
		for(int i = 0; i < lstFrags.count(); i++)
		{
			const QByteArray frags = lstFrags.at(i);
			QDataStream ds(frags);
			QString text;
			QTextCharFormat format;
			ds >> text >> format;
			bool bHandled = false;
			/*自定义控件，则可由外部处理*/
			emit insertMimiData(tc, text, format, bHandled);
			if(bHandled)
				continue;
			/*尝试主动处理相关信息。*/
			if(text.at(0) == QChar::ObjectReplacementCharacter)
			{
				for(int i = 0; i < text.length(); i++)
				{
					QTextImageFormat fmt = format.toImageFormat();
					if(!fmt.isValid())
					{
						/*自定义控件出现比较多*/
						continue;
					}
					QVariant vimgkey = fmt.property(KImageKey);
					QString imgkey = vimgkey.toString();
					tc.insertImage(imgkey, fmt);
				}
			}
			else
			{
				/*文字处理*/
				tc.insertText(text, format);
			}
		}
		return;
	}

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QTextEdit *editor = new QTextEdit;

    QTextDocument *document = new QTextDocument(editor);
    QTextCursor cursor(document);

    QTextImageFormat imageFormat;
    imageFormat.setName(":/images/advert.png");
    cursor.insertImage(imageFormat);

    QTextBlock block = cursor.block();
    QTextFragment fragment;
    QTextBlock::iterator it;

    for (it = block.begin(); !(it.atEnd()); ++it) {
        fragment = it.fragment();

        if (fragment.contains(cursor.position()))
            break;
    }

//! [0]
    if (fragment.isValid()) {
        QTextImageFormat newImageFormat = fragment.charFormat().toImageFormat();

        if (newImageFormat.isValid()) {
            newImageFormat.setName(":/images/newimage.png");
            QTextCursor helper = cursor;

            helper.setPosition(fragment.position());
            helper.setPosition(fragment.position() + fragment.length(),
                               QTextCursor::KeepAnchor);
            helper.setCharFormat(newImageFormat);
//! [0] //! [1]
        }
//! [1] //! [2]
    }
//! [2]

    cursor.insertBlock();
    cursor.insertText("Code less. Create more.");

    editor->setDocument(document);
    editor->setWindowTitle(tr("Text Document Image Format"));
    editor->resize(320, 480);
    editor->show();

    return app.exec();
}

QString Format::frameToString( QTextFrame *frame )
{
  QString out;

  QTextFrame::iterator it;
  for( it = frame->begin(); it != frame->end(); ++it ) {
    QTextBlock block = it.currentBlock();
    if ( block.isValid() ) {
      out += "<block";

      QTextCursor c( block );

      QDateTime dt = TextFormats::lastModified( c );
      if ( dt.isValid() ) {
        out += " lastmodified=\"" + dt.toString( Qt::ISODate ) + "\"";
      }

      if ( TextFormats::isTitle( c ) ) {
        out += " titlestyle=\"title\"";
      } else if ( TextFormats::isSubTitle( c ) ) {
        out += " titlestyle=\"subtitle\"";
      }

      QTextBlockFormat blockFormat = block.blockFormat();
      if ( blockFormat.isValid() ) {
        QTextList *list = block.textList();
        if ( list ) {
          QTextListFormat f = list->format();
          out += " liststyle=\"";
          switch( f.style() ) {
            default:
            case QTextListFormat::ListDisc:
              out += "disc";
              break;
            case QTextListFormat::ListDecimal:
              out += "decimal";
              break;
          }
          out += "\"";

          out += " listindent=\"" + QString::number( f.indent() ) + "\"";
        } else {
          if ( blockFormat.indent() != 0 ) {
            out += " blockindent=\"" + QString::number( blockFormat.indent() ) +
              "\"";
          }
        }
      }

      out += ">\n";
      
      QTextBlock::iterator it2;
      for( it2 = block.begin(); it2 != block.end(); ++it2 ) {
        QTextFragment fragment = it2.fragment();
        if ( !fragment.isValid() ) continue;

        QString text = fragment.text();

        QString outText;
        for( int i = 0; i < text.size(); ++i ) {
          if ( text.at( i ) == 0xfffc ) {
            outText += "<todo status=\"";

            QTextImageFormat imageFormat = fragment.charFormat().toImageFormat();
            if ( imageFormat.isValid() ) {
              if ( imageFormat.name().contains( "done" ) ) outText += "done";
              else outText += "todo";
            } else {
              dbg() << "NO IMAGE FORMAT" << endl;
            }
            
            outText += "\"/>";
          } else {
            outText += escape( QString( text.at( i ) ) );
          }
        }

        out += "  <fragment";

        QTextCharFormat format = fragment.charFormat();
        if ( !format.anchorHref().isEmpty() ) {
          out += " link=\"" + escape( format.anchorHref() ) + "\"";
        }
        if ( format.fontWeight() == QFont::Bold ) {
          out += " bold=\"true\"";
        }
        if ( format.fontItalic() ) {
          out += " italic=\"true\"";
        }
        if ( format.hasProperty( QTextFormat::FontPointSize ) &&
             format.fontPointSize() != 10 ) {
          out += " fontsize=\"" + QString::number( format.fontPointSize() ) +
            "\"";
        }

        if ( outText.trimmed().isEmpty() ) outText.replace( " ", "[FIXME:space]" );

        out += ">" + outText + "</fragment>\n";
      }
      
//.........这里部分代码省略.........