TreeView class

A widget used to render a treeview in the ui, based on the state of this tree inside the controller.

Inheritance

Constructors

TreeView({Key? key, required TreeController controller, required Widget nodeBuilder(BuildContext context, TreeNode<Object?> node), Widget indicator = const DefaultIndicator(height: 15), Widget indicatorBuilder(BuildContext context, TreeNode<Object?> referenceNode, Placement intendedPlacement)?, bool allowPlacement(TreeNode<Object?> referenceNode, Placement intendedPlacement)?, double childExtent = 8.0, double spacing = 8.0, Duration? animationDuration, DragStartMode dragStartMode = DragStartMode.tap})
A widget used to render a treeview in the ui, based on the state of this tree inside the controller.
const

Properties

allowPlacement → bool Function(TreeNode<Object?> referenceNode, Placement intendedPlacement)?
Wether or not the user is allowed to place the node at the intended placement with reference to the passed node.
final
animationDuration → Duration?
The duration of the collapse and expand animations.
final
childExtent → double
The indent each child node has with respect to its parent.
final
controller → TreeController
The controller this widget should use to build its contents.
final
dragStartMode → DragStartMode
Defines how drag interactions should be initiated for nodes in this tree.
final
hashCode → int
The hash code for this object.
no setterinherited
indicator → Widget
The indicator that is visible when a node is being dragged and shows where the widget would be placed if it would be dropped. To make an indicator that depends on the position it is in take a look at the indicatorBuilder property
final
indicatorBuilder → Widget Function(BuildContext context, TreeNode<Object?> referenceNode, Placement intendedPlacement)?
A builder that can be used to create indicators that depend on the node the dragged node will be placed under. If no builder is provided the regular indicator property will be used.
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
nodeBuilder → Widget Function(BuildContext context, TreeNode<Object?> node)
The builder used to build each node. Provides the context and the node being built, use the methods available on node to interact with it.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
spacing → double
The amount of space between nodes.
final

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<TreeView>
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