showMultiPickerBottomSheet<T, V> function

Future<List<V>?> showMultiPickerBottomSheet<T, V>(BuildContext context, { required List<T> sources, required ValueMapper<T, String?> labelMapper, String? title, List<V>? initialValue, ValueMapper<T, V>? valueMapper, ValueMapper<T, String>? subtitleMapper, MultiPickerItemBuilder<T>? pickerItemBuilder, bool? isScrollControlled, int? maxCount, int? minCount, ValueMapper<T, bool>? editableMapper, ValueMapper<String, T>? editableItemMapper, LabelEditCallback? onLabelChanged, bool enabledMapper(int index, T data)?, })

多选选择

点击取消将返回 null，开发者可根据返回值是否为 null 判断用户是否取消选择。

Implementation

Future<List<V>?> showMultiPickerBottomSheet<T, V>(
  BuildContext context, {
  required List<T> sources,
  required ValueMapper<T, String?> labelMapper,
  String? title,
  List<V>? initialValue,
  ValueMapper<T, V>? valueMapper,
  ValueMapper<T, String>? subtitleMapper,
  MultiPickerItemBuilder<T>? pickerItemBuilder,
  bool? isScrollControlled,
  int? maxCount,
  int? minCount,
  ValueMapper<T, bool>? editableMapper,
  ValueMapper<String, T>? editableItemMapper,
  LabelEditCallback? onLabelChanged,
  bool Function(int index, T data)? enabledMapper,
}) async {
  valueMapper ??= (T data) => data as V;
  isScrollControlled ??= sources.length > 10;
  List<V> data = [...?initialValue];
  final Widget content = _MultiSelectContent<T, V>(
    valueMapper: valueMapper,
    labelMapper: labelMapper,
    sources: sources,
    onChanged: (val) => data = val,
    subtitleMapper: subtitleMapper,
    pickerItemBuilder: pickerItemBuilder,
    editableMapper: editableMapper,
    editableItemMapper: editableItemMapper,
    onLabelChanged: onLabelChanged,
    initialData: data,
    maxCount: maxCount,
    enabledMapper: enabledMapper,
  );
  return await showDefaultBottomSheet<List<V>>(
    context,
    title: title ?? TxLocalizations.of(context).pickerTitle,
    contentBuilder: (context) => content,
    onConfirm: () => Navigator.pop(context, data),
    isScrollControlled: isScrollControlled,
  );
}