setLineDecorationLayer method

bool setLineDecorationLayer(String layerKey, Iterable<TextLineDecoration> decorations, { int priority = textDefaultLineDecorationLayerPriority, })

Implementation

bool setLineDecorationLayer(
  String layerKey,
  Iterable<TextLineDecoration> decorations, {
  int priority = textDefaultLineDecorationLayerPriority,
}) {
  final normalized = decorations
      .map((decoration) => decoration.clamp(lineCount))
      .toList(growable: false);

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

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

  _lineDecorationLayers[layerKey] = (
    decorations: normalized,
    order: existingLayer?.order ?? _nextLineDecorationLayerOrder++,
    priority: priority,
  );
  _syncImplicitLineDecorations();
  return true;
}