TreeView<T> class

A hierarchical tree view widget for displaying data in a collapsible structure.

Example:

TreeView<String>(
  nodes: [
    TreeNode<String>(ValueKey('root'), 'Root'),
  ],
  builder: (context, node, isSelected, animation, select) {
    return Text(node.data);
  },
  expanderBuilder: (context, isExpanded, animation) {
    return Icon(isExpanded ? Icons.expand_more : Icons.chevron_right);
  },
)
Inheritance

Constructors

TreeView({required List<TreeNode<T>> nodes, required TreeViewBuilder<T> builder, required ExpanderBuilder expanderBuilder, ExpansionChanged<T>? onExpansionChanged, ValueChanged<TreeNode<T>>? onSelectionChanged, TreeNode<T>? selectedNode, Widget indentation = const SizedBox(width: 16), Key? key, Curve animationCurve = Curves.easeInOut, Duration animationDuration = const Duration(milliseconds: 500)})
Creates a TreeView widget with the specified parameters.
const

Properties

animationCurve → Curve
The animation curve for expand/collapse animations.
final
animationDuration → Duration
The duration of expand/collapse animations.
final
builder → TreeViewBuilder<T>
Builds the content of each node.
final
expanderBuilder → ExpanderBuilder
Builds the expander icon (typically an arrow or chevron).
final
hashCode → int
The hash code for this object.
no setterinherited
indentation → Widget
Widget used for indentation of child nodes.
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
nodes → List<TreeNode<T>>
The root nodes of the tree view.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
selectedNode → TreeNode<T>?
The currently selected node, if any.
final

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<TreeView<T>>
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