Flutter searchDelegate -导航并在另一个页面中显示结果

Question

这是我到目前为止所做的事情。

点击键盘上的enter键后，flutter正在调用'showResults(context)‘(我想是的)。但是如果我想通过"Navigator.of(context).pushNamed('/rro'，arguments: query);“转到另一个屏幕怎么办？

如何在按enter键后停止flutting调用'showResults(context)‘，而不是导航到另一个屏幕？

class DataSearch extends SearchDelegate {
  final data = ['a', 'ab', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i'];
  final recent = ['b', 'c', 'd', 'e'];

  @override
  List buildActions(BuildContext context) {
    return [
      IconButton(
        icon: Icon(Icons.clear),
        onPressed: () {
          query = '';
        },
      ),
    ];
  }

  @override
  Widget buildLeading(BuildContext context) {
    return IconButton(
        icon: Icon(Icons.arrow_back),
      onPressed: () {
        close(context, null);
      },
    );
  }

  @override
  Widget buildResults(BuildContext context) {
    // Return type should be a Widget
    return null;
  }

  @override
  Widget buildSuggestions(BuildContext context) {
    final suggestionList = query.isEmpty
        ? recent
        : data.where((element) => element.startsWith(query)).toList();
    return ListView.builder(
      itemBuilder: (context, index) => ListTile(

        onTap: () {
          // On tap on any ListTile I can easily go to another screen
          Navigator.of(context).pushNamed('/rro', arguments: query);
        },
  
        title: Text(suggestionList[index]),
      ),
      itemCount: suggestionList.length,
    );
  }
}

Answer 1

只需覆盖showResults()，并在buildResults中返回一个容器。如果你尝试在这里返回null，这可能会显示一些错误，最好返回一个空的容器。

@override
  Widget buildResults(BuildContext context) => Container();

  @override
  void showResults(BuildContext context) {
    Navigator.of(context).popAndPushNamed(
      '/rro',
      arguments: query,
    );
    super.showResults(context);
  }