C++ QTextBlock::position方法代码示例

QString CVSEditor::changeUnderCursor(const QTextCursor &c) const
{
    // Try to match "1.1" strictly:
    // 1) Annotation: Check for a revision number at the beginning of the line.
    //    Note that "cursor.select(QTextCursor::WordUnderCursor)" will
    //    only select the part up until the dot.
    //    Check if we are at the beginning of a line within a reasonable offset.
    // 2) Log: check for lines like "revision 1.1", cursor past "revision"
    switch (contentType()) {
    case VCSBase::RegularCommandOutput:
    case VCSBase::DiffOutput:
        break;
    case VCSBase::AnnotateOutput: {
            const QTextBlock block = c.block();
            if (c.atBlockStart() || (c.position() - block.position() < 3)) {
                const QString line = block.text();
                if (m_revisionAnnotationPattern.exactMatch(line))
                    return m_revisionAnnotationPattern.cap(1);
            }
        }
        break;
    case VCSBase::LogOutput: {
            const QTextBlock block = c.block();
            if (c.position() - block.position() > 8 && m_revisionLogPattern.exactMatch(block.text()))
                return m_revisionLogPattern.cap(1);
        }
        break;
    }
    return QString();
}

void MarkdownEdit::insert_head(const QString &tag, bool blockStart)
{
    QTextCursor cur = m_ed->textCursor();
    cur.beginEditBlock();
    if (cur.hasSelection()) {
        QTextBlock begin = m_ed->document()->findBlock(cur.selectionStart());
        QTextBlock end = m_ed->document()->findBlock(cur.selectionEnd());
        if (end.position() == cur.selectionEnd()) {
            end = end.previous();
        }
        QTextBlock block = begin;
        do {
            if (block.text().length() > 0) {
                if (blockStart) {
                    cur.setPosition(block.position());
                } else {
                    QString text = block.text();
                    foreach(QChar c, text) {
                        if (!c.isSpace()) {
                            cur.setPosition(block.position()+text.indexOf(c));
                            break;
                        }
                    }
                }
                cur.insertText(tag);
            }
            block = block.next();
        } while(block.isValid() && block.position() <= end.position());
    } else {

void EditorUtil::EnumEditor(QPlainTextEdit *ed, EnumEditorProc proc, void *param)
{
    if (!ed) {
        return;
    }
    QTextCursor cur = ed->textCursor();
    cur.beginEditBlock();
    if (cur.hasSelection()) {
        QTextBlock begin = ed->document()->findBlock(cur.selectionStart());
        QTextBlock end = ed->document()->findBlock(cur.selectionEnd());
        if (end.position() == cur.selectionEnd()) {
            end = end.previous();
        }
        QTextBlock block = begin;
        do {
            if (block.text().length() > 0) {
                proc(cur,block,param);
            }
            block = block.next();
        } while(block.isValid() && block.position() <= end.position());
    } else {
        QTextBlock block = cur.block();
        proc(cur,block,param);
    }
    cur.endEditBlock();
    ed->setTextCursor(cur);
}

void CodeEditor::toggleFold(const QTextBlock &startBlock)
{
#ifdef HAVE_SYNTAX_HIGHLIGHTING
    // we also want to fold the last line of the region, therefore the ".next()"
    const auto endBlock = m_highlighter->findFoldingRegionEnd(startBlock).next();

    if (isFolded(startBlock)) {
        // unfold
        auto block = startBlock.next();
        while (block.isValid() && !block.isVisible()) {
            block.setVisible(true);
            block.setLineCount(block.layout()->lineCount());
            block = block.next();
        }

    } else {
        // fold
        auto block = startBlock.next();
        while (block.isValid() && block != endBlock) {
            block.setVisible(false);
            block.setLineCount(0);
            block = block.next();
        }
    }

    // redraw document
    document()->markContentsDirty(startBlock.position(), endBlock.position() - startBlock.position() + 1);
    // update scrollbars
    emit document()->documentLayout()->documentSizeChanged(document()->documentLayout()->documentSize());
#else
    Q_UNUSED(startBlock);
#endif
}

int SoTextEdit::findBraceLeft(void)
{
	QTextCursor cursor = textCursor();
 	QTextBlock block = cursor.block();
	int brace_count = 0, i, blockNumber = block.blockNumber();
	QString text;

	while (blockNumber != UNVALID_BLOCK) {
		text = block.text();
		i = text.size();
		for (; 0 <= i; i--) {
			if (text[i] == QChar('}')) {
				brace_count++;
			} else if (text[i] == QChar('{')) {
				brace_count--;
				if (brace_count == 0) {
					// cursor.deletePreviousChar();
					// cursor.insertText("}", colorFormat(Qt::darkCyan));

					 cursor.setPosition((block.position()) + i);
					// cursor.deleteChar();
					// cursor.insertText("{", colorFormat(Qt::darkCyan));

					 return (block.position() + i);
				}
			}
		}
		block = block.previous();
		blockNumber = block.blockNumber();
	}
	return -1;
}

bool TextBlockUserData::findNextBlockClosingParenthesis(QTextCursor *cursor)
{
    QTextBlock block = cursor->block();
    int position = cursor->position();
    int ignore = 0;
    while (block.isValid()) {
        Parentheses parenList = BaseTextDocumentLayout::parentheses(block);
        if (!parenList.isEmpty() && !BaseTextDocumentLayout::ifdefedOut(block)) {
            for (int i = 0; i < parenList.count(); ++i) {
                Parenthesis paren = parenList.at(i);
                if (paren.chr != QLatin1Char('{') && paren.chr != QLatin1Char('}')
                        && paren.chr != QLatin1Char('+') && paren.chr != QLatin1Char('-')
                        && paren.chr != QLatin1Char('[') && paren.chr != QLatin1Char(']'))
                    continue;
                if (block == cursor->block() &&
                        (position - block.position() > paren.pos - (paren.type == Parenthesis::Opened ? 1 : 0)))
                    continue;
                if (paren.type == Parenthesis::Opened) {
                    ++ignore;
                } else if (ignore > 0) {
                    --ignore;
                } else {
                    cursor->setPosition(block.position() + paren.pos+1);
                    return true;
                }
            }
        }
        block = block.next();
    }
    return false;
}

void QSyntaxHighlighterPrivate::_q_reformatBlocks(int from, int charsRemoved, int charsAdded)
{
    Q_UNUSED(charsRemoved);
    rehighlightPending = false;

    QTextBlock block = doc->findBlock(from);
    if (!block.isValid())
        return;

    int endPosition;
    QTextBlock lastBlock = doc->findBlock(from + charsAdded);
    if (lastBlock.isValid())
        endPosition = lastBlock.position() + lastBlock.length();
    else
        endPosition = doc->docHandle()->length();

    bool forceHighlightOfNextBlock = false;

    while (block.isValid() && (block.position() < endPosition || forceHighlightOfNextBlock)) {
        const int stateBeforeHighlight = block.userState();

        reformatBlock(block);

        forceHighlightOfNextBlock = (block.userState() != stateBeforeHighlight);

        block = block.next();
    }

    formatChanges.clear();
}

bool TextBlockUserData::findPreviousOpenParenthesis(QTextCursor *cursor, bool select, bool onlyInCurrentBlock)
{
    QTextBlock block = cursor->block();
    int position = cursor->position();
    int ignore = 0;
    while (block.isValid()) {
        Parentheses parenList = BaseTextDocumentLayout::parentheses(block);
        if (!parenList.isEmpty() && !BaseTextDocumentLayout::ifdefedOut(block)) {
            for (int i = parenList.count()-1; i >= 0; --i) {
                Parenthesis paren = parenList.at(i);
                if (block == cursor->block() &&
                        (position - block.position() <= paren.pos + (paren.type == Parenthesis::Closed ? 1 : 0)))
                    continue;
                if (paren.type == Parenthesis::Closed) {
                    ++ignore;
                } else if (ignore > 0) {
                    --ignore;
                } else {
                    cursor->setPosition(block.position() + paren.pos, select ? QTextCursor::KeepAnchor : QTextCursor::MoveAnchor);
                    return true;
                }
            }
        }
        if (onlyInCurrentBlock)
            return false;
        block = block.previous();
    }
    return false;
}

bool TextBlockUserData::findPreviousBlockOpenParenthesis(QTextCursor *cursor, bool checkStartPosition)
{
    QTextBlock block = cursor->block();
    int position = cursor->position();
    int ignore = 0;
    while (block.isValid()) {
        Parentheses parenList = BaseTextDocumentLayout::parentheses(block);
        if (!parenList.isEmpty() && !BaseTextDocumentLayout::ifdefedOut(block)) {
            for (int i = parenList.count()-1; i >= 0; --i) {
                Parenthesis paren = parenList.at(i);
                if (paren.chr != QLatin1Char('{') && paren.chr != QLatin1Char('}')
                        && paren.chr != QLatin1Char('+') && paren.chr != QLatin1Char('-')
                        && paren.chr != QLatin1Char('[') && paren.chr != QLatin1Char(']'))
                    continue;
                if (block == cursor->block()) {
                    if (position - block.position() <= paren.pos + (paren.type == Parenthesis::Closed ? 1 : 0))
                        continue;
                    if (checkStartPosition && paren.type == Parenthesis::Opened && paren.pos== cursor->position()) {
                        return true;
                    }
                }
                if (paren.type == Parenthesis::Closed) {
                    ++ignore;
                } else if (ignore > 0) {
                    --ignore;
                } else {
                    cursor->setPosition(block.position() + paren.pos);
                    return true;
                }
            }
        }
        block = block.previous();
    }
    return false;
}

QString QueryPanel::getActiveStatement(int block, int col) {

    int from = 0, to = -1;
    State st;

    QTextBlock b = editor->document()->findBlockByNumber(block);
    int scol = col;
    while(b.isValid()) {
        st.opaque = b.userState();
        if(st.s.col != -1 && st.s.col < scol) {
            from = b.position() + st.s.col + 1;
            break;
        }
        scol = INT_MAX;
        b = b.previous();
    }

    b = editor->document()->findBlockByNumber(block);
    scol = col;
    while(b.isValid()) {
        st.opaque = b.userState();
        if(st.s.col != -1 && st.s.col >= scol) {
            to = b.position() + st.s.col;
            break;
        }
        scol = 0;
        b = b.next();
    }

    QString all = editor->document()->toPlainText();
    if(to < 0)
        to = all.length();
    return all.mid(from,to);;
}

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 TikzEditor::showMatchingBrackets()
{
	for (QTextBlock block = firstVisibleBlock(); block.isValid(); block = block.next())
	{
		if (blockBoundingGeometry(block).top() > viewport()->height())
			break;

		const QString text = block.text();
		const int textLength = text.length();

		for (int i = 0; i < textLength; ++i)
		{
			if (block.position() + i == m_matchingBegin || block.position() + i == m_matchingEnd)
			{
				QList<QTextEdit::ExtraSelection> extraSelectionList = extraSelections();
				if (!isReadOnly())
				{
					QTextEdit::ExtraSelection selection;
					selection.format.setBackground(m_matchingColor);
					selection.cursor = textCursor();
					selection.cursor.setPosition(block.position() + i, QTextCursor::MoveAnchor);
					selection.cursor.movePosition(QTextCursor::Right, QTextCursor::KeepAnchor);
					extraSelectionList.append(selection);
				}
				setExtraSelections(extraSelectionList);
			}
		}
	}
}

static void insertSequenceToHeader(QTextBlock p_block,
                                   QRegExp &p_reg,
                                   QRegExp &p_preReg,
                                   const QString &p_seq)
{
    if (!p_block.isValid()) {
        return;
    }

    QString text = p_block.text();
    bool matched = p_reg.exactMatch(text);
    Q_ASSERT(matched);

    matched = p_preReg.exactMatch(text);
    Q_ASSERT(matched);

    int start = p_reg.cap(1).length() + 1;
    int end = p_preReg.cap(1).length();

    Q_ASSERT(start <= end);

    QTextCursor cursor(p_block);
    cursor.setPosition(p_block.position() + start);
    if (start != end) {
        cursor.setPosition(p_block.position() + end, QTextCursor::KeepAnchor);
    }

    if (p_seq.isEmpty()) {
        cursor.removeSelectedText();
    } else {
        cursor.insertText(p_seq + ' ');
    }
}

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;
	}
}

QString selectedLines(QTextDocument *doc, const QTextBlock &startBlock, const QTextBlock &endBlock)
{
    return Utils::Text::textAt(QTextCursor(doc),
                               startBlock.position(),
                               std::max(0,
                                        endBlock.position() + endBlock.length()
                                            - startBlock.position() - 1));
}