resolveCellStyle function

CellStyle resolveCellStyle({ required Iterable<CellStyle?> cascade, Set<CellStyleState> states = const {}, })

Resolves cascade from lowest to highest priority.

Base styles merge in order. For each active state, the highest-priority non-null patch wins as a unit and is then merged over the base. An explicit CellStyle.none therefore suppresses a lower-priority state cue. Disabled is exclusive of transient/value states.

Implementation

CellStyle resolveCellStyle({
  required Iterable<CellStyle?> cascade,
  Set<CellStyleState> states = const {},
}) {
  final layers = [for (final style in cascade) ?style];
  var result = CellStyle.none;
  for (final layer in layers) {
    result = result.merge(_plainCellStyle(layer));
  }

  final active = states.contains(CellStyleState.disabled)
      ? const [CellStyleState.disabled]
      : _cellStyleStatePaintOrder.where(states.contains);
  for (final state in active) {
    CellStyle? patch;
    for (final layer in layers) {
      if (layer is _InteractiveCellStyle) {
        patch = layer._styleFor(state) ?? patch;
      }
    }
    if (patch != null) {
      result = result.merge(_plainCellStyle(patch));
    }
  }
  return result;
}