Method drawInfoBox

YUViewLib/src/ui/views/PlotViewWidget.cpp:784–846

}

void PlotViewWidget::drawInfoBox(QPainter &painter) const
{
  if (!this->model)
    return;

  const auto margin  = 6;
  const auto padding = 6;

  QString infoString;
  for (auto streamIndex : this->showStreamList)
  {
    if (!this->currentlyHoveredPointPerStreamAndPlot.contains(streamIndex))
      continue;

    const auto streamParam = this->model->getStreamParameter(streamIndex);
    for (unsigned plotIndex = 0; plotIndex < streamParam.getNrPlots(); plotIndex++)
    {
      if (!this->currentlyHoveredPointPerStreamAndPlot[streamIndex].contains(plotIndex))
        continue;

      const auto pointIndex = this->currentlyHoveredPointPerStreamAndPlot[streamIndex][plotIndex];
      infoString += this->model->getPointInfo(streamIndex, plotIndex, pointIndex);
    }
  }

  // Create a QTextDocument. This object can tell us the size of the rendered text.
  QTextDocument textDocument;
  textDocument.setHtml(infoString);
  textDocument.setDefaultStyleSheet("* { color: #FFFFFF }");
  textDocument.setTextWidth(textDocument.size().width());

  // Translate to the position where the text box shall be
  // Consider where the mouse is and move the box out of the way if the mouse is here
  if (!QCursor::pos().isNull())
  {
    const auto mousePos = mapFromGlobal(QCursor::pos());
    auto       posX     = this->plotRect.bottomRight().x() - axisMaxValueMargin - margin -
                textDocument.size().width() - padding * 2 + 1;
    auto posY = this->plotRect.bottomRight().y() - axisMaxValueMargin - margin -
                textDocument.size().height() - padding * 2 + 1;

    const auto margin = 5;
    if (mousePos.x() >= posX - margin && mousePos.x() < posX + textDocument.size().width() + margin)
    {
      posX -= margin * 2 + textDocument.size().width();
      posX = std::max(posX, this->plotRect.left());
    }

    painter.translate(posX, posY);
  }

  // Draw a black rectangle and then the text on top of that
  QRect  rect(QPoint(0, 0), textDocument.size().toSize() + QSize(2 * padding, 2 * padding));
  QBrush originalBrush;
  painter.setBrush(QColor(255, 255, 255, 150));
  painter.setPen(Qt::black);
  painter.drawRect(rect);
  painter.translate(padding, padding);