getAllExpandedStates method
获取所有组件的展开状态
Implementation
Map<LayoutPosition, bool> getAllExpandedStates() {
if (!isBound) return {};
final states = <LayoutPosition, bool>{};
for (final position in LayoutPosition.values) {
if (_state!.expandedStates.containsKey(position)) {
states[position] = _state!.expandedStates[position] ?? false;
}
}
return states;
}