TreeView class Null safety

Defines the TreeView widget.

This is the main widget for the package. It requires a controller and allows you to specify other optional properties that manages the appearance and handle events.

TreeView(
  controller: _treeViewController,
  allowParentSelect: false,
  supportParentDoubleTap: false,
  onExpansionChanged: _expandNodeHandler,
  onNodeTap: (key) {
    setState(() {
      _treeViewController = _treeViewController.copyWith(selectedKey: key);
    });
  },
  theme: treeViewTheme
),
Inheritance

Constructors

TreeView({Key? key, required TreeViewController controller, dynamic onNodeTap(String)?, dynamic onNodeDoubleTap(String)?, ScrollPhysics? physics, dynamic onExpansionChanged(String, bool)?, bool allowParentSelect = false, bool supportParentDoubleTap = false, bool shrinkWrap = false, bool primary = true, Widget nodeBuilder(BuildContext, Node)?, TreeViewTheme? theme})

Properties

allowParentSelect bool
Determines whether the user can select a parent node. If false, tapping the parent will expand or collapse the node. If true, the node will be selected and the use has to use the expander to expand or collapse the node.
final
child Widget
The widget below this widget in the tree.
finalinherited
controller TreeViewController
The controller for the TreeView. It manages the data and selected key.
final
hashCode int
The hash code for this object.
@nonVirtualread-onlyinherited
key Key?
Controls how one widget replaces another widget in the tree.
finalinherited
nodeBuilder → (Widget Function?(BuildContext, Node)?)
Custom builder for nodes. Parameters are the build context and tree node.
final
onExpansionChanged → (dynamic Function?(String, bool)?)
The expand/collapse handler for a node. Passes the node key and the expansion state.
final
onNodeDoubleTap → (dynamic Function?(String)?)
The double tap handler for a node. Passes the node key.
final
onNodeTap → (dynamic Function?(String)?)
The tap handler for a node. Passes the node key.
final
physics ScrollPhysics?
How the TreeView should respond to user input.
final
primary bool
Whether the TreeView is the primary scroll widget associated with the parent PrimaryScrollController..
final
runtimeType Type
A representation of the runtime type of the object.
read-onlyinherited
shrinkWrap bool
Whether the extent of the TreeView should be determined by the contents being viewed.
final
supportParentDoubleTap bool
Determines whether the parent node can receive a double tap. This is useful if allowParentSelect is true. This allows the user to double tap the parent node to expand or collapse the parent when allowParentSelect is true. IMPORTANT When true, the tap handler is delayed. This is because the double tap action requires a short delay to determine whether the user is attempting a single or double tap.
final
theme TreeViewTheme
The theme for TreeView.
final

Methods

createElement() InheritedElement
Inflates this configuration to a concrete instance.
inherited
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
@protectedinherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent 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
updateShouldNotify(covariant TreeView oldWidget) bool
Whether the framework should notify widgets that inherit from this widget.
override

Operators

operator ==(Object other) bool
The equality operator.
@nonVirtualinherited

Static Methods

of(BuildContext context) TreeView?