C++ QTextDocument::findBlock方法代码示例

void GenericCodeEditor::paintLineIndicator( QPaintEvent *e )
{
    QPalette plt( mLineIndicator->palette() );
    QRect r( e->rect() );
    QPainter p( mLineIndicator );

    p.fillRect( r, plt.color( QPalette::Mid ) );
    p.setPen( plt.color(QPalette::Dark) );
    p.drawLine( r.topRight(), r.bottomRight() );

    p.setPen( plt.color(QPalette::ButtonText) );

    QTextDocument *doc = QPlainTextEdit::document();
    QTextCursor cursor(textCursor());
    int selStartBlock, selEndBlock;
    if (cursor.hasSelection()) {
        selStartBlock = doc->findBlock(cursor.selectionStart()).blockNumber();
        selEndBlock = doc->findBlock(cursor.selectionEnd()).blockNumber();
    }
    else
        selStartBlock = selEndBlock = -1;

    QTextBlock block = firstVisibleBlock();
    int blockNumber = block.blockNumber();
    qreal top = blockBoundingGeometry(block).translated(contentOffset()).top();
    qreal bottom = top + blockBoundingRect(block).height();

    while (block.isValid() && top <= e->rect().bottom()) {
        if (block.isVisible() && bottom >= e->rect().top()) {
            p.save();

            QRectF numRect( 0, top, mLineIndicator->width() - 1, bottom - top );

            int num = blockNumber;
            if (num >= selStartBlock && num <= selEndBlock) {
                num -= selStartBlock;
                p.setPen(Qt::NoPen);
                p.setBrush(plt.color(QPalette::Highlight));
                p.drawRect(numRect);
                p.setPen(plt.color(QPalette::HighlightedText));
            }

            QString number = QString::number(num + 1);
            p.drawText(0, top, mLineIndicator->width() - 4, bottom - top,
                       Qt::AlignRight, number);

            p.restore();
        }

        block = block.next();
        top = bottom;
        bottom = top + blockBoundingRect(block).height();
        ++blockNumber;
    }
}

void ProFileHoverHandler::identifyMatch(TextEditor::ITextEditor *editor, int pos)
{
    m_docFragment.clear();
    m_manualKind = UnknownManual;
    if (ProFileEditorWidget *proFileEditor = qobject_cast<ProFileEditorWidget *>(editor->widget())) {
        if (!proFileEditor->extraSelectionTooltip(pos).isEmpty()) {
            setToolTip(proFileEditor->extraSelectionTooltip(pos));
        } else {
            QTextDocument *document = proFileEditor->document();
            QTextBlock block = document->findBlock(pos);
            identifyQMakeKeyword(block.text(), pos - block.position());

            if (m_manualKind != UnknownManual) {
                QUrl url(QString::fromLatin1("qthelp://com.trolltech.qmake/qdoc/qmake-%1-reference.html#%2")
                        .arg(manualName()).arg(m_docFragment));
                setLastHelpItemIdentified(TextEditor::HelpItem(url.toString(),
                                          m_docFragment, TextEditor::HelpItem::QMakeVariableOfFunction));
            } else {
                // General qmake manual will be shown outside any function or variable
                setLastHelpItemIdentified(TextEditor::HelpItem(QLatin1String("qmake"),
                                          TextEditor::HelpItem::Unknown));
            }
        }
    }
}

template<> void 
QConsoleWidget::_pf<void, UpdatePromptWidget>(
        QConsoleWidget * thisp
        ) {
    //TODO: UpdatePromptWidget
    {
        QFontMetricsF fontMetrics(
                    thisp->thisp->textCharFormat.font());
        
		{
            QTextDocument * doc = thisp->document();
            QTextBlock textBlock =
                    doc->findBlock(thisp->promptEndPos_);
		 			 
            QTextCursor cursor_(textBlock);
            QTextBlockFormat bf_ = textBlock.blockFormat();

            float fh =
                    fontMetrics.height()
                    +1.55f;

            thisp->thisp->setFixedHeight(fh);
            thisp->thisp->setFixedWidth(fh);
            bf_.setTextIndent( thisp->thisp->width() );
            cursor_.setBlockFormat(bf_);
            thisp->setTextCursor(cursor_);
        }
		         
    }
    _pf<void, UpdatePromptWidgetPositon>(thisp);
    thisp->raise();
}

QTextBlock QTextDocumentProto::findBlock(int pos) const
{
  QTextDocument *item = qscriptvalue_cast<QTextDocument*>(thisObject());
  if (item)
    return item->findBlock(pos);
  return QTextBlock();
}

void VPreviewManager::fetchImageLinksFromRegions(QVector<VElementRegion> p_imageRegions,
                                                 QVector<ImageLinkInfo> &p_imageLinks)
{
    p_imageLinks.clear();

    if (p_imageRegions.isEmpty()) {
        return;
    }

    p_imageLinks.reserve(p_imageRegions.size());

    QTextDocument *doc = m_editor->document();

    for (int i = 0; i < p_imageRegions.size(); ++i) {
        const VElementRegion &reg = p_imageRegions[i];
        QTextBlock block = doc->findBlock(reg.m_startPos);
        if (!block.isValid()) {
            continue;
        }

        int blockStart = block.position();
        int blockEnd = blockStart + block.length() - 1;
        QString text = block.text();

        // Since the image links update signal is emitted after a timer, during which
        // the content may be changed.
        if (reg.m_endPos > blockEnd) {
            continue;
        }

        ImageLinkInfo info(reg.m_startPos,
                           reg.m_endPos,
                           blockStart,
                           block.blockNumber(),
                           calculateBlockMargin(block, m_editor->tabStopWidthW()));
        if ((reg.m_startPos == blockStart
             || isAllSpaces(text, 0, reg.m_startPos - blockStart))
            && (reg.m_endPos == blockEnd
                || isAllSpaces(text, reg.m_endPos - blockStart, blockEnd - blockStart))) {
            // Image block.
            info.m_isBlock = true;
            fetchImageInfoToPreview(text, info);
        } else {
            // Inline image.
            info.m_isBlock = false;
            fetchImageInfoToPreview(text.mid(reg.m_startPos - blockStart,
                                             reg.m_endPos - reg.m_startPos),
                                    info);
        }

        if (info.m_linkUrl.isEmpty() || info.m_linkShortUrl.isEmpty()) {
            continue;
        }

        p_imageLinks.append(info);
    }
}

void PlainTextEditor::indentOrUnindent( bool doIndent )
{
    QTextCursor cursor = textCursor();
    cursor.beginEditBlock();

    // Indent or unindent the selected lines
    int pos = cursor.position();
    int anchor = cursor.anchor();
    int start = qMin( anchor, pos );
    int end = qMax( anchor, pos );

    QTextDocument* doc = document();
    QTextBlock startBlock = doc->findBlock(start);
    QTextBlock endBlock = doc->findBlock( end -1 ).next();

    for ( QTextBlock block = startBlock; block != endBlock; block = block.next() ) {
        QString text = block.text();

        if ( doIndent ) {
            const int indentPosition = firstNonSpace( text );
            cursor.setPosition( block.position() +indentPosition );
            cursor.insertText( QString( IndentSize, QLatin1Char( ' ' ) ) );
        } else {
            const int indentPosition = firstNonSpace( text );
            const int targetColumn = indentedColumn( columnAt( text, indentPosition ), false );
            cursor.setPosition( block.position() +indentPosition );
            cursor.setPosition( block.position() +targetColumn, QTextCursor::KeepAnchor );
            cursor.removeSelectedText();
        }
    }

    // Reselect the selected lines
    cursor.setPosition( startBlock.position() );
    cursor.setPosition( endBlock.previous().position(), QTextCursor::KeepAnchor );
    cursor.movePosition( QTextCursor::EndOfBlock, QTextCursor::KeepAnchor );

    cursor.endEditBlock();
    setTextCursor( cursor );
}

int ScCodeEditor::indentationLevel(const QTextCursor & cursor)
{
    QTextDocument *doc = QPlainTextEdit::document();
    int startBlockNum = doc->findBlock(cursor.selectionStart()).blockNumber();

    QStack<int> stack;
    int level = 0;
    int blockNum = 0;
    QTextBlock block = QPlainTextEdit::document()->begin();
    while (block.isValid()) {
        if (level > 0) {
            stack.push(level);
            level = 0;
        }

        TextBlockData *data = static_cast<TextBlockData*>(block.userData());
        if (data) {
            int count = data->tokens.size();
            for (int idx = 0; idx < count; ++idx) {
                const Token & token = data->tokens[idx];
                switch (token.type) {
                case Token::OpeningBracket:
                    if (token.character != '(' || stack.size() || token.positionInBlock)
                        level += 1;
                    break;

                case Token::ClosingBracket:
                    if (level)
                        level -= 1;
                    else if(!stack.isEmpty()) {
                        stack.top() -= 1;
                        if (stack.top() <= 0)
                            stack.pop();
                    }
                    break;

                default:
                    ;
                }
            }
        }

        if (blockNum == startBlockNum)
            return stack.size();

        block = block.next();
        ++blockNum;
    }

    return -1;
}

    virtual void indentSelection(const QTextCursor &selection,
                                 const QString &fileName,
                                 const TextEditor::TextDocument *textDocument) const
    {
        // ### shares code with QmlJSTextEditor::indent
        QTextDocument *doc = selection.document();

        QTextBlock block = doc->findBlock(selection.selectionStart());
        const QTextBlock end = doc->findBlock(selection.selectionEnd()).next();

        const TextEditor::TabSettings &tabSettings =
            ProjectExplorer::actualTabSettings(fileName, textDocument);
        CreatorCodeFormatter codeFormatter(tabSettings);
        codeFormatter.updateStateUntil(block);

        do {
            const int depth = codeFormatter.indentFor(block);
            if (depth != -1)
                tabSettings.indentLine(block, depth);
            codeFormatter.updateLineStateChange(block);
            block = block.next();
        } while (block.isValid() && block != end);
    }

void GenericCodeEditor::showPosition( int pos, int selectionLength )
{
    if (pos < 0) return;

    QTextDocument *doc = QPlainTextEdit::document();
    if (!doc) return;

    int lineNumber = doc->findBlock(pos).firstLineNumber();
    verticalScrollBar()->setValue(lineNumber);

    QTextCursor cursor(doc);
    cursor.setPosition(pos);
    if (selectionLength)
        cursor.setPosition(pos + selectionLength, QTextCursor::KeepAnchor);

    setTextCursor(cursor);
}

QString ChatTextEdit::currentUrl(QMouseEvent* e) const
{
    QTextDocument* doc = document();

    int cursor_pos = cursorForPosition(e->pos()).position();
    QTextBlock block = doc->findBlock(cursor_pos);
    int block_pos = block.position();

    QString text = block.text();

    QVector<int> url_index, url_length;
    QStringList urls;

    int index = 0;
    QString url;
    do
    {
        int length = 0;
        url = urlFound(text, index, length);
        if(url.size())
        {
            url_index.push_back(index);
            url_length.push_back(length);
            urls.push_back(url);
        }
        index += length;
    }
    while(url.size());

    url.clear();

    for(int i=0;i<url_index.size();i++)
    {
        if(cursor_pos >= block_pos+url_index[i] &&
           cursor_pos < block_pos+url_index[i]+url_length[i])
        {
           url = urls[i];
           break;
        }
    }

    return url;
}

/*!
 *  Returns the rectangle for the cursor including the predictive text area.
 *  HbAbstractEditPrivate::ensurePositionVisible() uses the same algorithm.
 */
QRectF NmEditorTextEdit::rectForCursorPosition() const
{
    NM_FUNCTION;
    
    int cursorPos = cursorPosition();
    QRectF rect = rectForPosition(cursorPos);
    QTextDocument *doc = document();
    if (doc) {
        rect.adjust(0, -doc->documentMargin(), 0, doc->documentMargin());
        const QTextBlock block = doc->findBlock(cursorPos);
        QTextLayout *blockLayout = block.layout();
        if (block.isValid() && blockLayout) {
            if (blockLayout->preeditAreaText().length()) {
                // Adjust cursor rect so that predictive text will be also visible
                rect.adjust(0, 0, boundingRect().width() / 2, 0);
            }
        }
    }

    return rect;
}

 void searchTargetFromCurrentLine(QEditor *editor)
 {
   m_targetPos.clear();
   if (editor == NULL) {
     return;
   }
   m_currentGroup = 0;
   QTextDocument *doc = editor->document();
   int cursorPos = editor->textCursor().position();
   QTextBlock currentLineBlock = doc->findBlock(cursorPos);
   int firstPos = currentLineBlock.position();
   int lastPos = firstPos + currentLineBlock.length() - 1;
   for (int offset = 1; cursorPos - offset >= firstPos || cursorPos + offset <= lastPos; offset++) {
     if (cursorPos + offset <= lastPos) {
       m_targetPos << (cursorPos + offset);
     }
     if (cursorPos - offset >= firstPos) {
       m_targetPos << (cursorPos - offset);
     }
   }
 }

QPair<int, int> getFirstAndLastVisiblePosition(Editor *editor)
{
  QTextCursor cursor = editor->textCursor();
  QTextDocument *doc = editor->document();
  int currentLine = doc->findBlock(cursor.position()).blockNumber();
  int cursorHeight = editor->cursorRect().height();
  int lineCountToFirstVisibleLine = editor->cursorRect().top() / cursorHeight;
  int firstVisibleLineNum = currentLine - lineCountToFirstVisibleLine;
  if (firstVisibleLineNum < 0) {
    firstVisibleLineNum = 0;
  }
  int maxLineNumOnScreen = (editor->viewport()->height() / cursorHeight);
  if (maxLineNumOnScreen < 1) {
    maxLineNumOnScreen = 1;
  }
  int firstPos = doc->findBlockByNumber(firstVisibleLineNum).position();
  int lastVisibleLineNum = firstVisibleLineNum + maxLineNumOnScreen - 1;
  QTextBlock lastVisibleTextBlock = doc->findBlockByNumber(lastVisibleLineNum);
  if (!lastVisibleTextBlock.isValid()) {
    lastVisibleTextBlock = doc->lastBlock();
  }
  int lastPos = lastVisibleTextBlock.position() + lastVisibleTextBlock.length() - 1;
  return QPair<int, int>(firstPos, lastPos);
}

void VMdEditor::updateHeaders(const QVector<VElementRegion> &p_headerRegions)
{
    QTextDocument *doc = document();

    QVector<VTableOfContentItem> headers;
    QVector<int> headerBlockNumbers;
    QVector<QString> headerSequences;
    if (!p_headerRegions.isEmpty()) {
        headers.reserve(p_headerRegions.size());
        headerBlockNumbers.reserve(p_headerRegions.size());
        headerSequences.reserve(p_headerRegions.size());
    }

    // Assume that each block contains only one line
    // Only support # syntax for now
    QRegExp headerReg(VUtils::c_headerRegExp);
    int baseLevel = -1;
    for (auto const & reg : p_headerRegions) {
        QTextBlock block = doc->findBlock(reg.m_startPos);
        if (!block.isValid()) {
            continue;
        }

        if (!block.contains(reg.m_endPos - 1)) {
            qWarning() << "header accross multiple blocks, starting from block"
                       << block.blockNumber()
                       << block.text();
        }

        if ((block.userState() == HighlightBlockState::Normal)
            && headerReg.exactMatch(block.text())) {
            int level = headerReg.cap(1).length();
            VTableOfContentItem header(headerReg.cap(2).trimmed(),
                                       level,
                                       block.blockNumber(),
                                       headers.size());
            headers.append(header);
            headerBlockNumbers.append(block.blockNumber());
            headerSequences.append(headerReg.cap(3));

            if (baseLevel == -1) {
                baseLevel = level;
            } else if (baseLevel > level) {
                baseLevel = level;
            }
        }
    }

    m_headers.clear();

    bool autoSequence = m_config.m_enableHeadingSequence
                        && !isReadOnly()
                        && m_file->isModifiable();
    int headingSequenceBaseLevel = g_config->getHeadingSequenceBaseLevel();
    if (headingSequenceBaseLevel < 1 || headingSequenceBaseLevel > 6) {
        headingSequenceBaseLevel = 1;
    }

    QVector<int> seqs(7, 0);
    QRegExp preReg(VUtils::c_headerPrefixRegExp);
    int curLevel = baseLevel - 1;
    for (int i = 0; i < headers.size(); ++i) {
        VTableOfContentItem &item = headers[i];
        while (item.m_level > curLevel + 1) {
            curLevel += 1;

            // Insert empty level which is an invalid header.
            m_headers.append(VTableOfContentItem(c_emptyHeaderName,
                                                 curLevel,
                                                 -1,
                                                 m_headers.size()));
            if (autoSequence) {
                addHeaderSequence(seqs, curLevel, headingSequenceBaseLevel);
            }
        }

        item.m_index = m_headers.size();
        m_headers.append(item);
        curLevel = item.m_level;
        if (autoSequence) {
            addHeaderSequence(seqs, item.m_level, headingSequenceBaseLevel);

            QString seqStr = headerSequenceStr(seqs);
            if (headerSequences[i] != seqStr) {
                // Insert correct sequence.
                insertSequenceToHeader(doc->findBlockByNumber(headerBlockNumbers[i]),
                                       headerReg,
                                       preReg,
                                       seqStr);
            }
        }
    }

    emit headersChanged(m_headers);

    updateCurrentHeader();
}

bool GenericCodeEditor::find( const QRegExp &expr, QTextDocument::FindFlags options )
{
    // Although QTextDocument provides a find() method, we implement
    // our own, because the former one is not adequate.

    if(expr.isEmpty()) return true;

    bool backwards = options & QTextDocument::FindBackward;

    QTextCursor c( textCursor() );
    int pos;
    if (c.hasSelection())
    {
        bool matching = expr.exactMatch(c.selectedText());

        if( backwards == matching )
            pos = c.selectionStart();
        else
            pos = c.selectionEnd();
    }
    else
        pos = c.position();

    QTextDocument *doc = QPlainTextEdit::document();
    QTextBlock startBlock = doc->findBlock(pos);
    int startBlockOffset = pos - startBlock.position();

    QTextCursor cursor;

    if (!backwards) {
        int blockOffset = startBlockOffset;
        QTextBlock block = startBlock;
        while (block.isValid()) {
            if (findInBlock(doc, block, expr, blockOffset, options, cursor))
                break;
            blockOffset = 0;
            block = block.next();
        }
        if(cursor.isNull())
        {
            blockOffset = 0;
            block = doc->begin();
            while(true) {
                if (findInBlock(doc, block, expr, blockOffset, options, cursor)
                    || block == startBlock)
                    break;
                block = block.next();
            }
        }
    } else {
        int blockOffset = startBlockOffset;
        QTextBlock block = startBlock;
        while (block.isValid()) {
            if (findInBlock(doc, block, expr, blockOffset, options, cursor))
                break;
            block = block.previous();
            blockOffset = block.length() - 1;
        }
        if(cursor.isNull())
        {
            block = doc->end();
            while(true) {
                blockOffset = block.length() - 1;
                if (findInBlock(doc, block, expr, blockOffset, options, cursor)
                    || block == startBlock)
                    break;
                block = block.previous();
            }
        }
    }

    if(!cursor.isNull()) {
        setTextCursor(cursor);
        return true;
    }
    else
        return false;
}