TreeRowBuilderDelegate class

A delegate that supplies nodes for a TreeViewport on demand using a builder callback.

This is not typically used directly, instead being created and managed by the TreeView so that the builder can be called for only those TreeViewNodes that are currently active in the TreeView.

The rowCount is determined by the number of active nodes in the TreeView.

Inheritance
Mixed in types

Constructors

TreeRowBuilderDelegate({required int rowCount, bool addAutomaticKeepAlives = true, required TwoDimensionalIndexedWidgetBuilder nodeBuilder, required TreeVicinityToRowBuilder rowBuilder})
Creates a lazy building delegate to use with a TreeView.

Properties

addAutomaticKeepAlives bool
Whether to wrap each child in an AutomaticKeepAlive.
finalinherited
addRepaintBoundaries bool
Whether to wrap each child in a RepaintBoundary.
finalinherited
builder TwoDimensionalIndexedWidgetBuilder
Called to build children on demand.
finalinherited
hashCode int
The hash code for this object.
no setterinherited
hasListeners bool
Whether any listeners are currently registered.
no setterinherited
maxXIndex int?
The maximum ChildVicinity.xIndex for children in the x axis.
getter/setter pairinherited
maxYIndex int?
The maximum ChildVicinity.yIndex for children in the y axis.
getter/setter pairinherited
rowCount int
The number of rows that the tree has active nodes for.
getter/setter pairoverride-getter
runtimeType Type
A representation of the runtime type of the object.
no setterinherited

Methods

addListener(VoidCallback listener) → void
Register a closure to be called when the object changes.
inherited
build(BuildContext context, covariant ChildVicinity vicinity) Widget?
Returns the child with the given ChildVicinity, which is described in terms of x and y indices.
inherited
buildRow(TreeVicinity vicinity) TreeRow
Builds the TreeRow that describe the row for the provided TreeVicinity.
override
dispose() → void
Discards any resources used by the object. After this is called, the object is not in a usable state and should be discarded (calls to addListener will throw after the object is disposed).
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
notifyListeners() → void
Call all the registered listeners.
inherited
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
shouldRebuild(covariant TwoDimensionalChildDelegate oldDelegate) bool
Called whenever a new instance of the child delegate class is provided.
inherited
toString() String
A string representation of this object.
inherited

Operators

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