116 lines
3.2 KiB
Dart
116 lines
3.2 KiB
Dart
import 'dart:async';
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import 'package:flutter/material.dart';
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import 'package:sendtrain/services/functional/debouncer.dart';
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import 'package:sendtrain/widgets/generic/elements/form_text_input.dart';
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class Suggestion<T> {
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T type;
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Suggestion(this.type);
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}
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// controller: manages the selected content
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// service: manages the requests for the specific data to search against
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// title: the title of the text input
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// callback: the fuction called when a selection is made
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class FormSearchInput extends StatefulWidget {
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const FormSearchInput(
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{super.key,
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required this.controller,
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required this.service,
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this.title,
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this.callback});
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final String? title;
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final TextEditingController controller;
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final dynamic service;
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final Function? callback;
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@override
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State<FormSearchInput> createState() => _FormSearchInputState();
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}
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class _FormSearchInputState extends State<FormSearchInput> {
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String? _currentQuery;
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late final service = widget.service;
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late final callback = widget.callback;
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// The most recent suggestions received from the API.
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late Iterable<Widget> _lastOptions = <Widget>[];
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late final Debouncer debouncer;
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// @override
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// initState() {
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// service = widget.service;
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// }
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// Calls the "remote" API to search with the given query. Returns null when
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// the call has been made obsolete.
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Future<Iterable<Suggestion>?> _search(String query) async {
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_currentQuery = query;
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// In a real application, there should be some error handling here.
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// final Iterable<String> options = await _FakeAPI.search(_currentQuery!);
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if (query.isNotEmpty) {
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final List<Suggestion>? suggestions =
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await service.fetchSuggestions(_currentQuery!, 'en');
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// If another search happened after this one, throw away these options.
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if (_currentQuery != query) {
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return null;
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}
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_currentQuery = null;
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return suggestions?.map((suggestion) => suggestion);
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} else {
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return null;
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}
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}
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@override
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void initState() {
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super.initState();
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debouncer = Debouncer(Duration(milliseconds: 50), _search);
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}
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@override
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Widget build(BuildContext context) {
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return SearchAnchor(
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builder: (BuildContext context, SearchController controller) {
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return FormTextInput(
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controller: widget.controller,
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title: widget.title ?? "",
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icon: Icon(Icons.search_rounded),
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maxLines: 2,
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requiresValidation: false,
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onTap: () {
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controller.openView();
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});
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}, suggestionsBuilder:
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(BuildContext context, SearchController controller) async {
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final List<Suggestion>? options =
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(await debouncer.process(controller.text))?.toList();
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if (options == null) {
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return _lastOptions;
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}
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_lastOptions = List<ListTile>.generate(options.length, (int index) {
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final Suggestion item = options[index];
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final dynamic content = item.type;
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return ListTile(
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title: Text(content.description),
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onTap: () async {
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if (callback != null) {
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callback!(content, service);
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}
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controller.closeView(null);
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},
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);
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});
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return _lastOptions;
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});
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}
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}
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