TreeSnapshot<TKey, TItem> class

Immutable normalized tree structure consumed by SyncedSliverTree.

roots defines root order, dataByKey stores payloads, and childrenByParent stores sibling order for each parent.

Constructors

TreeSnapshot({required Iterable<TKey> roots, required Map<TKey, TItem> dataByKey, Map<TKey, Iterable<TKey>>? childrenByParent})

TreeSnapshot.fromFlat({required Iterable<TItem> items, required TKey keyOf(TItem item), required TKey? parentOf(TItem item)})

Builds a validated snapshot from flat items with optional parent keys.

factory

TreeSnapshot.fromHierarchy({required Iterable<TItem> roots, required TKey keyOf(TItem item), required Iterable<TItem> childrenOf(TItem item)})

Builds a validated snapshot from nested domain objects.

factory

Properties

childrenByParent → Map<TKey, List<TKey>>

Child keys keyed by parent node ID.

final

dataByKey → Map<TKey, TItem>

Payloads keyed by node ID.

final

hashCode → int

The hash code for this object.

no setter, inherited

roots → List<TKey>

Root node keys in render order.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

buildChildren(TKey parentKey) → List<TreeNode<TKey, TItem>>

Converts the children of parentKey into TreeNode objects.

buildRoots() → List<TreeNode<TKey, TItem>>

Converts the snapshot roots into TreeNode objects for syncing.

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

operator [](TKey key) → TItem?

Gets the payload for key, or null if missing.