getSlideDelta method

double getSlideDelta(
  1. TKey key
)

Current slide delta for key in scroll-space y, or 0.0 if the node is not currently sliding. Read by RenderSliverTree.paint, RenderSliverTree.applyPaintTransform, and the hit-test path on every frame (no caching, staleness-safe under tick-without-paint).

Implementation

double getSlideDelta(TKey key) {
  final base = _slide.deltaForKey(key);
  if (!_preview.hasActive) {
    return base;
  }
  return base + _preview.deltaForNid(nidOf(key));
}