Method connectBars

qcustomplot/qcustomplot.cpp:24305–24332

! \internal Connects \a below and \a above to each other via their mBarAbove/mBarBelow properties. The bar(s) currently above lower and below upper will become disconnected to lower/upper. If lower is zero, upper will be disconnected at the bottom. If upper is zero, lower will be disconnected at the top. */

  If upper is zero, lower will be disconnected at the top.
*/
void QCPBars::connectBars(QCPBars *lower, QCPBars *upper)
{
  if (!lower && !upper) return;
  
  if (!lower) // disconnect upper at bottom
  {
    // disconnect old bar below upper:
    if (upper->mBarBelow && upper->mBarBelow.data()->mBarAbove.data() == upper)
      upper->mBarBelow.data()->mBarAbove = 0;
    upper->mBarBelow = 0;
  } else if (!upper) // disconnect lower at top
  {
    // disconnect old bar above lower:
    if (lower->mBarAbove && lower->mBarAbove.data()->mBarBelow.data() == lower)
      lower->mBarAbove.data()->mBarBelow = 0;
    lower->mBarAbove = 0;
  } else // connect lower and upper
  {
    // disconnect old bar above lower:
    if (lower->mBarAbove && lower->mBarAbove.data()->mBarBelow.data() == lower)
      lower->mBarAbove.data()->mBarBelow = 0;
    // disconnect old bar below upper:
    if (upper->mBarBelow && upper->mBarBelow.data()->mBarAbove.data() == upper)
      upper->mBarBelow.data()->mBarAbove = 0;
    lower->mBarAbove = upper;
    upper->mBarBelow = lower;
  }
}
/* end of 'src/plottables/plottable-bars.cpp' */