addIndexListener method

void addIndexListener(
  1. int index,
  2. ItemSelectionChangeCallback listener
)
inherited

Adds a listener callback for selection changes at a specific index only.

Implementation

void addIndexListener(int index, ItemSelectionChangeCallback listener) {
  assert(_debugAssertNotDisposed());
  if (!_indexListeners!.containsKey(index)) {
    _indexListeners![index] = ObserverList<ItemSelectionChangeCallback>();
  }
  _indexListeners![index]!.add(listener);
}