INNER CODE UNIT · Dart

ObserverCore

fluttercandies/flutter_scrollview_observer · lib/src/observer_core.dart:18

class ObserverCore {
  /// Handles observation logic of a sliver similar to [SliverList].
  static ListViewObserveModel? handleListObserve({
    required BuildContext context,
    double Function()? fetchLeadingOffset,
    double? Function(BuildContext)? customOverlap,
    double toNextOverPercent = 1,
  }) {
    var _obj = ObserverUtils.findRenderObject(context);
    if (_obj is! RenderSliverMultiBoxAdaptor) return null;
    final viewport = ObserverUtils.findViewport(_obj);
    if (viewport == null) return null;
    if (kDebugMode) {
      if (viewport.debugNeedsPaint) return null;
    }
    // The geometry.visible is not absolutely reliable.
    if (!(_obj.geometry?.visible ?? false) ||
        _obj.constraints.remainingPaintExtent < 1e-10) {

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