WidgetStateBorderSide.fromMap constructor

const WidgetStateBorderSide.fromMap(
  1. WidgetStateMap<BorderSide?> map
)

Creates a WidgetStateBorderSide from a WidgetStateMap.

This constructor's resolve method finds the first MapEntry whose key is satisfied by the set of states, and returns its associated value. It should only be used with widgets that document support for WidgetStateBorderSide objects (throws an error if used as a regular BorderSide.)

Example:

const Chip(
  label: Text('Transceiver'),
  side: WidgetStateBorderSide.fromMap(<WidgetStatesConstraint, BorderSide?>{
    WidgetState.selected: BorderSide(color: Colors.red),
    // returns null if not selected, deferring to default theme/widget value.
  }),
),

To prevent a situation where each WidgetStatesConstraint isn't satisfied by the given set of states, consider adding WidgetState.any as the final WidgetStateMap key.

Implementation

const factory WidgetStateBorderSide.fromMap(WidgetStateMap<BorderSide?> map) =
    _WidgetBorderSideMapper;