setDecorationLayer method

bool setDecorationLayer(String layerKey, Iterable<TextDecorationRange> decorations, { int priority = textDefaultDecorationLayerPriority, })

Implementation

bool setDecorationLayer(
  String layerKey,
  Iterable<TextDecorationRange> decorations, {
  int priority = textDefaultDecorationLayerPriority,
}) {
  _refreshDocumentSnapshot();
  final normalized = decorations
      .map((range) => range.normalized().clamp(_document.length))
      .where((range) => !range.isEmpty)
      .toList(growable: false);

  final existingLayer = _decorationLayers[layerKey];
  if (normalized.isEmpty) {
    if (existingLayer == null) {
      return false;
    }
    _decorationLayers.remove(layerKey);
    _rebuildDecorations();
    return true;
  }

  if (existingLayer != null &&
      existingLayer.priority == priority &&
      _decorationListsEqual(existingLayer.decorations, normalized)) {
    return false;
  }

  _decorationLayers[layerKey] = (
    decorations: normalized,
    order: existingLayer?.order ?? _nextDecorationLayerOrder++,
    priority: priority,
  );
  _rebuildDecorations();
  return true;
}