popupCellPadding property
Contains a cell margin for the popup. The popup widget will never get closer to the target header cell on the vertical axis. Horizontal axis values offsets the popup widget relative to the horizontal boundaries of the target cell.
Defaults to the height of the target cell for the top and 0 for the rest.
Can be changed at any time (except SchedulerPhase.persistentCallbacks).
Implementation
final ValueNotifier<EdgeInsets?> popupCellPadding;