initChildren method
Implementation
@override
void initChildren({List<WidgetModel>? children, Map? itemTemplate}) {
_controller.children = children;
_controller.itemTemplate = ItemTemplate.from(itemTemplate);
if (_controller.children != null && itemTemplate != null) {
throw LanguageError(
'${EnsembleStaggeredGrid.type} accepts either children or item-template',
recovery: 'Please pick either children or item-template');
}
}