showingTooltipIndicators property

List<int> showingTooltipIndicators
final

you can show some tooltipIndicators (a popup with an information) on top of each BarChartRodData using showingTooltipIndicators, just put indices you want to show it on top of them.

An important point is that you have to disable the default touch behaviour to show the tooltip manually, see BarTouchData.handleBuiltInTouches.

Implementation

final List<int> showingTooltipIndicators;