handleKeyEvent method

@override void handleKeyEvent(KeyEvent event)

Handles user key inputs to update the internal value.

Implementation

@override
void handleKeyEvent(KeyEvent event) {
  if (options.isEmpty) return;

  final currentVal = value ?? [];
  for (var i = 0; i < options.length; i++) {
    _selected[i] = currentVal.contains(options[i].value);
  }

  if (event.type == KeyType.up) {
    _selectedIndex = (_selectedIndex - 1).clamp(0, options.length - 1);
    if (_state != null) {
      _state!.setState(() {});
    }
  } else if (event.type == KeyType.down) {
    _selectedIndex = (_selectedIndex + 1).clamp(0, options.length - 1);
    if (_state != null) {
      _state!.setState(() {});
    }
  } else if (event.key == ' ' || event.type == KeyType.enter) {
    _selected[_selectedIndex] = !_selected[_selectedIndex];
    final nextVal = <T>[];
    for (var i = 0; i < options.length; i++) {
      if (_selected[i]) {
        nextVal.add(options[i].value);
      }
    }
    value = nextVal;
    if (_state != null) {
      _state!.setState(() {});
    }
  }
}