ScrollOrchestrator<TKey, TData> class

Scroll orchestration. See library docs.

Constructors

ScrollOrchestrator({required TreeController<TKey, TData> controller, required TickerProvider vsync})

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

animateScrollToKey(TKey key, {required ScrollController scrollController, Duration duration = const Duration(milliseconds: 300), Curve curve = Curves.easeInOut, double alignment = 0.0, AncestorExpansionMode ancestorExpansion = AncestorExpansionMode.immediate, double extentEstimator(TKey key)?, double sliverBaseOffset = 0.0}) → Future<bool>

Animates scrollController to reveal key. See TreeController.animateScrollToKey for the full contract.

dispose() → void

No-op forward-compat hook. Today the orchestrator owns no disposable resources (the AnimationController inside _animatedConcurrentScroll is a method-local that disposes itself when the loop completes).

ensureAncestorsExpanded(TKey key) → int

Synchronously expands every collapsed ancestor of key.

extentOf(TKey key, {double extentEstimator(TKey key)?}) → double

Returns the best-known full (non-animated) extent for key: measured if available, else estimator, else defaultExtent.

fullOffsetAt(int index) → double

Returns the prefix-sum full-extent offset up to visible index index (exclusive). Public so the controller can access it via a thin shim if any other path inside the controller still needs it.

invalidatePrefix() → void

Marks the prefix sum stale. Called from _order's onOrderMutated callback (via the controller wrapper) and from setFullExtent / _purgeNodeData when the stored extent changes.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

scrollOffsetOf(TKey key, {double extentEstimator(TKey key)?}) → double?

Returns the sliver-space scroll offset of key, or null if key is not in the current visible order. See TreeController.scrollOffsetOf for the full contract.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited