INNER CODE UNIT · Dart

deltaTop

rvamsikrishna/inview_notifier_list · lib/src/inview_state.dart:80

      final double deltaTop = vpOffset.offset - notification.metrics.pixels;

      //distance from bottom of the widget to top of the viewport
      final double deltaBottom = deltaTop +
          (_scrollDirection == Axis.vertical ? size.height : size.width);
      bool isInViewport = false;

      //Check if the item is in the viewport by evaluating the provided widget's isInViewPortCondition condition.
      isInViewport = _isInViewCondition!(deltaTop, deltaBottom, vpHeight);

      if (isInViewport) {
        //prevent changing the value on every scroll if its already the same
        if (!_currentInViewIds.contains(item.id)) {
          _currentInViewIds.add(item.id);
          notifyListeners();
        }
      } else {
        if (_currentInViewIds.contains(item.id)) {

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