C++ QTextBlock::next方法代码示例

/*!
 * \brief ModelicaEditor::getPlainText
 * Reads the leading spaces information from the text block user data and inserts them to the actual string.
 * \return
 */
QString ModelicaEditor::getPlainText()
{
  if (mpModelWidget->getLibraryTreeItem()->isInPackageOneFile()) {
    QString text;
    QTextBlock block = mpPlainTextEdit->document()->firstBlock();
    while (block.isValid()) {
      TextBlockUserData *pTextBlockUserData = BaseEditorDocumentLayout::userData(block);
      if (pTextBlockUserData) {
        if (pTextBlockUserData->getLeadingSpaces() == -1) {
          TextBlockUserData *pFirstBlockUserData = BaseEditorDocumentLayout::userData(mpPlainTextEdit->document()->firstBlock());
          if (pFirstBlockUserData) {
            pTextBlockUserData->setLeadingSpaces(pFirstBlockUserData->getLeadingSpaces());
          } else {
            pTextBlockUserData->setLeadingSpaces(0);
          }
        }
        text += QString(pTextBlockUserData->getLeadingSpaces(), ' ');
      }
      text += block.text();
      block = block.next();
      if (block.isValid()) { // not last block
        text += "\n";
      }
    }
    return text;
  } else {
    return mpPlainTextEdit->toPlainText();
  }
}

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);
			}
		}
	}
}

/*************************************************
//  Function: 		PaintLineNumberArea
//  Description: 	绘制左侧行号区域
//  Calls:
//  Called By: 		CLineNumberArea::paintEvent
//  Parameter:      QPaintEvent *event
//  Return: 		void
//  Others: 		通过CLineNumberArea类的paintEvent函数来调用本函数，
以保证能够实时更新该行数
*************************************************/
void CCodeEditor::PaintLineNumberArea(QPaintEvent *event)
{
	QPainter painter(m_lineNumberArea);
	painter.fillRect(event->rect(), Qt::lightGray);	/*行数背景颜色*/
	QTextBlock block = firstVisibleBlock();
	int blockNumber = block.blockNumber();	/*当前行(从0开始)*/


	int top = (int)blockBoundingGeometry(block).translated(contentOffset()).top() + fontMetrics().descent();/*绘制区域的顶部*/
	int bottom = top + (int)blockBoundingRect(block).height();	/*绘制区域的底部*/

	/*绘制可见区域*/
	while (block.isValid() && top <= event->rect().bottom())
	{
		if (block.isVisible() && bottom >= event->rect().top())
		{
			QString number = QString::number(blockNumber + 1);
			painter.setPen(Qt::black);	/*行号颜色*/
			painter.drawText(0, top, m_lineNumberArea->width(), fontMetrics().height(),
				Qt::AlignCenter, number);
		}

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

void CppCodeStylePreferencesWidget::updatePreview()
{
    CppCodeStylePreferences *cppCodeStylePreferences = m_preferences
            ? m_preferences
            : CppToolsSettings::instance()->cppCodeStyle();
    const CppCodeStyleSettings ccss = cppCodeStylePreferences->currentCodeStyleSettings();
    const TextEditor::TabSettings ts = cppCodeStylePreferences->currentTabSettings();
    QtStyleCodeFormatter formatter(ts, ccss);
    foreach (TextEditor::SnippetEditorWidget *preview, m_previews) {
        preview->setTabSettings(ts);
        preview->setCodeStyle(cppCodeStylePreferences);

        QTextDocument *doc = preview->document();
        formatter.invalidateCache(doc);

        QTextBlock block = doc->firstBlock();
        QTextCursor tc = preview->textCursor();
        tc.beginEditBlock();
        while (block.isValid()) {
            preview->indenter()->indentBlock(doc, block, QChar::Null, ts);

            block = block.next();
        }
        tc.endEditBlock();
    }

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 TikzEditor::printWhiteSpaces(QPainter &painter)
{
	const QFontMetrics fontMetrics = QFontMetrics(document()->defaultFont());

	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)
		{
			QTextCursor cursor = textCursor();
			cursor.setPosition(block.position() + i, QTextCursor::MoveAnchor);
			const QRect rect = cursorRect(cursor);

//			const QFontMetrics fontMetrics = QFontMetrics(cursor.charFormat().font());

			if (m_showWhiteSpaces && text.at(i) == ' ')
				paintSpace(painter, rect.x() + spaceWidth() / 2.0, rect.y() + fontMetrics.height() / 2.0);
			else if (m_showTabulators && text.at(i) == '\t')
				paintTabstop(painter, rect.x() + spaceWidth() / 2.0, rect.y() + fontMetrics.height() / 2.0);
		}
	}
}

//! Activated whenever LineNumberArea Widget paint event is raised.
//! Writes the line numbers for the visible blocks.
void ModelicaEditor::lineNumberAreaPaintEvent(QPaintEvent *event)
{
    QPainter painter(mpLineNumberArea);
    painter.fillRect(event->rect(), QColor(240, 240, 240));

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

    while (block.isValid() && top <= event->rect().bottom())
    {
        if (block.isVisible() && bottom >= event->rect().top())
        {
            QString number = QString::number(blockNumber + 1);
            // make the current highlighted line number darker
            if (blockNumber == textCursor().blockNumber())
            {
                painter.setPen(QColor(64, 64, 64));
            }
            else
            {
                painter.setPen(Qt::gray);
            }
            painter.setFont(document()->defaultFont());
            QFontMetrics fontMetrics (document()->defaultFont());
            painter.drawText(0, top, mpLineNumberArea->width() - 5, fontMetrics.height(), Qt::AlignRight, number);
        }
        block = block.next();
        top = bottom;
        bottom = top + (int) blockBoundingRect(block).height();
        ++blockNumber;
    }
}

void GenericCodeEditor::updateCurrentLineHighlighting()
{
    int currentCursorBlock = textCursor().blockNumber();
    int first_block_num = qMin(mLastCursorBlock, currentCursorBlock);
    int second_block_num = qMax(mLastCursorBlock, currentCursorBlock);

    QRegion region(0,0,0,0);

    QTextBlock block = firstVisibleBlock();
    int block_num = block.blockNumber();
    qreal top = blockBoundingGeometry(block).translated(contentOffset()).top();
    qreal max_top = viewport()->rect().bottom();
    while (block.isValid() && block_num <= second_block_num && top <= max_top)
    {
        QRectF block_rect = blockBoundingRect(block);
        if (block_num == first_block_num || block_num == second_block_num) {
            region += block_rect.translated(0, top).toRect();
        }
        top += block_rect.height();
        block = block.next();
        ++block_num;
    }

    viewport()->update( region );
}

void CppQtStyleIndenter::indent(QTextDocument *doc,
                                const QTextCursor &cursor,
                                const QChar &typedChar,
                                const TextEditor::TabSettings &tabSettings)
{
    if (cursor.hasSelection()) {
        QTextBlock block = doc->findBlock(cursor.selectionStart());
        const QTextBlock end = doc->findBlock(cursor.selectionEnd()).next();

        CppTools::QtStyleCodeFormatter codeFormatter(tabSettings, codeStyleSettings());
        codeFormatter.updateStateUntil(block);

        QTextCursor tc = cursor;
        tc.beginEditBlock();
        do {
            int indent;
            int padding;
            codeFormatter.indentFor(block, &indent, &padding);
            tabSettings.indentLine(block, indent + padding, padding);
            codeFormatter.updateLineStateChange(block);
            block = block.next();
        } while (block.isValid() && block != end);
        tc.endEditBlock();
    } else {
        indentBlock(doc, cursor.block(), typedChar, tabSettings);
    }
}

void DevHighlighter::reformatBlocks(int from, int charsRemoved, int charsAdded)
{
	QTextBlock block = doc->findBlock(from);
	if (!block.isValid())
		return;

	QTextBlock endBlock;
	if (charsAdded > charsRemoved || charsAdded == charsRemoved)
		endBlock = doc->findBlock(from + charsAdded);
	else
		endBlock = block;

	bool forceHighlightOfNextBlock = false;

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

		reformatBlock(block);

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

		block = block.next();
	}

	formatChanges.clear();
}

int GenericCodeEditor::findAll( const QRegExp &expr, QTextDocument::FindFlags options )
{
    mSearchSelections.clear();

    if(expr.isEmpty()) {
        this->updateExtraSelections();
        return 0;
    }

    QTextEdit::ExtraSelection selection;
    selection.format = mSearchResultTextFormat;

    QTextDocument *doc = QPlainTextEdit::document();
    QTextBlock block = doc->begin();
    QTextCursor cursor;

    while (block.isValid()) {
        int blockPos = block.position();
        int offset = 0;
        while(findInBlock(doc, block, expr, offset, options, cursor)) {
            offset = cursor.selectionEnd() - blockPos;

            if (cursor.hasSelection()) {
                selection.cursor = cursor;
                mSearchSelections.append(selection);
            } else
                offset += 1;
        }
        block = block.next();
    }

    this->updateExtraSelections();

    return mSearchSelections.count();
}

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;
	}
}

void TextEditor::lineNumberAreaPaintEvent(QPaintEvent *event)
{
    QPainter painter(lineNumberArea);
   // painter.fillRect(event->rect(), Qt::black);


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

    while (block.isValid() && top <= event->rect().bottom()) {
        if (block.isVisible() && bottom >= event->rect().top()) {
            QString number = QString::number(blockNumber + 1);
            painter.setPen(Qt::darkGray);
            painter.drawText(0, top, lineNumberArea->width(), fontMetrics().height(),
                             Qt::AlignRight, number);
        }

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

static int findClosingMatch(const QTextDocument *doc, int cursorPosition)
{
    QTextBlock block = doc->findBlock(cursorPosition);
    JSBlockData *blockData = reinterpret_cast<JSBlockData*>(block.userData());
    if (!blockData->bracketPositions.isEmpty()) {
        int depth = 1;
        while (block.isValid()) {
            blockData = reinterpret_cast<JSBlockData*>(block.userData());
            if (blockData && !blockData->bracketPositions.isEmpty()) {
                for (int c = 0; c < blockData->bracketPositions.count(); ++c) {
                    int absPos = block.position() + blockData->bracketPositions.at(c);
                    if (absPos <= cursorPosition)
                        continue;
                    if (doc->characterAt(absPos) == '{')
                        depth++;
                    else
                        depth--;
                    if (depth == 0)
                        return absPos;
                }
            }
            block = block.next();
        }
    }
    return -1;
}

void Text::spatiumChanged(qreal oldVal, qreal newVal)
      {
      Element::spatiumChanged(oldVal, newVal);

      if (!sizeIsSpatiumDependent() || styled())
            return;
      qreal v = newVal / oldVal;

      QTextCursor c(_doc);
      QTextBlock cb = _doc->begin();
      while (cb.isValid()) {
            QTextBlock::iterator i(cb.begin());
            for (; !i.atEnd(); ++i) {
                  QTextFragment f = i.fragment();
                  if (f.isValid()) {
                        int pos = f.position();
                        int len = f.length();
                        c.setPosition(pos, QTextCursor::MoveAnchor);
                        c.setPosition(pos + len, QTextCursor::KeepAnchor);
                        QTextCharFormat cf = c.charFormat();
                        QFont font = cf.font();
                        font.setPointSizeF(font.pointSizeF() * v);
                        cf.setFont(font);
                        c.setCharFormat(cf);
                        }
                  }
            cb = cb.next();
            }
      }