startSelectionHandleDrag abstract method

bool startSelectionHandleDrag({
  1. required bool enabled,
  2. required FdcGridCellRef anchor,
  3. required FdcGridCellRef extent,
})

Starts resizing the retained range from its bottom-right selection handle.

The normalized anchor remains fixed while pointer updates move the current extent. Returns false when range selection is unavailable.

Implementation

bool startSelectionHandleDrag({
  required bool enabled,
  required FdcGridCellRef anchor,
  required FdcGridCellRef extent,
});