ItemSelectionBuilder class

Builds itself based on selection state changes.

ItemSelectionBuilder is used in conjunction with ItemSelectionController. Widget rebuilding is scheduled by appropriate selection changes in the controller.

Notice that you must tell ItemSelectionBuilder the index it represents, and a builder method that is called when the selection state of that particular index changes.

Example

Widget build(BuildContext context) {
  return ItemSelectionController(
    child: Column(
      children: List.generate(5, (int index) {
        // tell the builder which index it represents
        return ItemSelectionBuilder(
          index: index,
          builder: (BuildContext context, int index, bool selected) {
            // build a selectable item
            return Text('$index: $selected');
          },
        );
      }),
    ),
  );
}

Inheritance

Constructors

ItemSelectionBuilder({Key? key, required int index, ItemSelectionController? controller, required ItemSelectionWidgetBuilder builder}): Creates an item selection builder.

Properties

hashCode → int: The hash code for this object.
no setterinherited
index → int: The index of this builder widget.
final
key → Key?: Controls how one widget replaces another widget in the tree.
finalinherited
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited

Methods

createElement() → StatefulElement: Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → _ItemSelectionBuilderState: Creates the mutable state for this widget at a given location in the tree.
override
debugDescribeChildren() → List<DiagnosticsNode>: Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void: Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode: Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
inherited
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String: A string representation of this object.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String: Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String: Returns a one-line detailed description of the object.
inherited
toStringShort() → String: A short, textual description of this widget.
inherited

Operators

operator ==(Object other) → bool: The equality operator.
inherited