Skip to main content

Grid Events and Callbacks

Keep dataset lifecycle behavior in FdcDataSet and visual interaction behavior in FdcGrid.

Cell changes​

FdcGrid(
  dataSet: customers,
  onCellChanged: (context) {
    final field = context.fieldName;
    final oldValue = context.oldValue;
    final value = context.value;
  },
)

Focus transitions​

The grid exposes row, column, and exact-cell enter/exit callbacks:

FdcGrid(
  dataSet: customers,
  onRowEnter: (context) {},
  onRowExit: (context) {},
  onColumnEnter: (context) {},
  onColumnExit: (context) {},
  onCellEnter: (context) {},
  onCellExit: (context) {},
)

These are notifications, not navigation veto hooks. Validation and posting rules belong in dataset lifecycle events.

Edit permission gates​

FdcGrid(
  dataSet: customers,
  canEditRow: (rowIndex, row) => !row.valueOf<bool>('locked'),
  canEditColumn: (rowIndex, column, row) =>
      column.fieldName != 'id',
)

Column value lifecycle​

Use onValueChanging to transform or reject the pending value and onValueChanged to observe a successful write for that column.