expandLastSelectionByBlock method

UserSelectionState expandLastSelectionByBlock(AxisDirection direction, { required IntVector2 getNextCoordinateInCellsBlock(IntVector2 coordinate), required int limit, })

Expands last selection in a given AxisDirection by a block of cells.

TableUserSelectionModels are not expandable, HeaderUserSelectionModel are expandable only on the cross axis and CellUserSelectionModel is expandable in all directions.

See also:

• TableShortcuts and TableActions where the shortcuts are mapped into actions that allow the user to expand the last selection

Implementation

UserSelectionState expandLastSelectionByBlock(
  AxisDirection direction, {
  required IntVector2 Function(IntVector2 coordinate)
      getNextCoordinateInCellsBlock,
  required int limit,
}) {
  if (primarySelection is TableUserSelectionModel) {
    return this;
  }

  if (primarySelection is HeaderUserSelectionModel) {
    final selection = primarySelection as HeaderUserSelectionModel;
    if (selection.axis != axisDirectionToAxis(direction)) {
      return this;
    }

    final focus =
        direction == AxisDirection.up || direction == AxisDirection.left
            ? 0
            : limit;
    return updateLastSelectionToHeaderSelection(
      focus: focus,
      axis: selection.axis,
    );
  }

  final selection = primarySelection as CellUserSelectionModel;
  final newFocus = getNextCoordinateInCellsBlock(selection.focus);

  return updateLastSelectionToCellSelection(
    focus: newFocus,
    anchor: selection.anchor,
  );
}