TreeNodeBuilder<TKey, TData> class

A widget that listens to a TreeController but only rebuilds when the specified node's hasChildren or isExpanded state changes.

Example:

TreeNodeBuilder<String, MyData>(
  controller: controller,
  nodeId: path,
  builder: (context, hasChildren, isExpanded) {
    if (hasChildren) {
      return IconButton(
        icon: Icon(isExpanded ? Icons.expand_less : Icons.expand_more),
        onPressed: () => controller.toggle(path),
      );
    }
    return const SizedBox.shrink();
  },
)

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatefulWidget
• TreeNodeBuilder

Constructors

TreeNodeBuilder({required TreeController<TKey, TData> controller, required TKey nodeId, required Widget builder(BuildContext context, bool hasChildren, bool isExpanded), Key? key})

Creates a tree node builder.

const

Properties

builder → Widget Function(BuildContext context, bool hasChildren, bool isExpanded)

Builder called with the node's current state.

final

controller → TreeController<TKey, TData>

The controller to listen to.

final

hashCode → int

The hash code for this object.

no setter, inherited

key → Key?

Controls how one widget replaces another widget in the tree.

final, inherited

nodeId → TKey

The node ID to track.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

createElement() → StatefulElement

Creates a StatefulElement to manage this widget's location in the tree.

inherited

createState() → State<TreeNodeBuilder<TKey, TData>>

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, int wrapWidth = 65}) → 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