TreeController class

Manages the expand/collapse state of a TreeView.

Each node is identified by an Object key. Use toggleExpansion to expand or collapse, and isExpanded to query state.

Inheritance

Constructors

TreeController({Set<Object>? initialExpandedKeys}): Creates a TreeController with optional initialExpandedKeys.

expandedKeys → Set<Object>: The set of currently expanded node keys.
no setter
hashCode → int: The hash code for this object.
no setterinherited
hasListeners → bool: Whether any listeners are currently registered.
no setterinherited
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited

addListener(dynamic listener()) → void: Register a closure to be called when the object changes.
inherited
collapse(Object key) → void: Collapses the node identified by key.
collapseAll() → void: Collapses all nodes.
dispose() → void: Discards any resources used by the object.
override
expand(Object key) → void: Expands the node identified by key.
expandAll(List<Object> allKeys) → void: Expands all nodes whose keys are in allKeys.
isExpanded(Object key) → bool: Returns true if the node identified by key is expanded.
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
notifyListeners() → void: Call all the registered listeners.
inherited
removeListener(dynamic listener()) → void: Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
toggleExpansion(Object key) → void: Toggles the expansion state of the node identified by key.
toString() → String: A string representation of this object.
inherited