TreeView<T> class

A collapsible tree view that renders hierarchical data.

Uses roots as the top-level nodes and getChildren to traverse deeper. Each node is built by builder. The TreeController manages expand/collapse state.

Inheritance

Constructors

TreeView({Key? key, required List<T> roots, required Widget builder(T node, int depth, bool isExpanded), required List<T> getChildren(T node), required Object nodeKey(T node), bool isExpandable(T node)?, TreeController? controller, FocusNode? focusNode, void onNodeSelected(T node)?})
Creates a TreeView with the given roots, builder, and traversal callbacks.
const

Properties

builder → Widget Function(T node, int depth, bool isExpanded)
Builds the visual representation for each node at the given depth.
final
controller → TreeController?
An optional external controller for expand/collapse state.
final
focusNode → FocusNode?
An optional focus node for keyboard navigation.
final
getChildren → List<T> Function(T node)
Returns the child nodes of the given node.
final
hashCode → int
The hash code for this object.
no setterinherited
isExpandable → bool Function(T node)?
An optional predicate that returns whether node can be expanded.
final
key → Key?
Controls how one widget replaces another in the tree.
finalinherited
nodeKey → Object Function(T node)
Returns a unique key identifying node.
final
onNodeSelected → void Function(T node)?
Called when the user activates a node.
final
roots → List<T>
The top-level tree nodes.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

createElement() → StatefulElement
Creates the Element for this widget.
inherited
createState() → State<TreeView<T>>
Creates the mutable state for this widget.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
inherited

Operators

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