Method paintLineNumbers

src/texteditor.cpp:286–312

}

void TextEditor::paintLineNumbers(QPaintEvent* e, const QColor& textColor)
{
  QStyleOption opt;
  opt.initFrom(m_lineNumbers);

  QPainter painter(m_lineNumbers);

  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 <= e->rect().bottom()) {
    if (block.isVisible() && bottom >= e->rect().top()) {
      QString number = QString::number(blockNumber + 1);
      painter.setPen(textColor);

      painter.drawText(0, top, m_lineNumbers->width() - 3, fontMetrics().height(),
                       Qt::AlignRight, number);
    }

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

void TextEditor::highlightCurrentLine()
{