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Merge pull request #121 from maheshmnj/issue-118
Expose onScroll event listener
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| import 'package:flutter/material.dart'; | ||
| import 'package:searchfield/searchfield.dart'; | ||
|
|
||
| class Pagination extends StatefulWidget { | ||
| const Pagination({Key? key}) : super(key: key); | ||
|
|
||
| @override | ||
| State<Pagination> createState() => _PaginationState(); | ||
| } | ||
|
|
||
| class _PaginationState extends State<Pagination> { | ||
| final focus = FocusNode(); | ||
|
|
||
| Future<List<String>> getPaginatedSuggestions({int pageLength = 5}) async { | ||
| await Future.delayed(const Duration(seconds: 2)); | ||
| int total = suggestions.length; | ||
| return List.generate(pageLength, (index) { | ||
| total++; | ||
| return 'Item $total'; | ||
| }); | ||
| } | ||
|
|
||
| static const surfaceGreen = Color.fromARGB(255, 237, 255, 227); | ||
| static const surfaceBlue = Color(0xffd3e8fb); | ||
| static const skyBlue = Color(0xfff3ddec); | ||
|
|
||
| var suggestions = <String>[]; | ||
|
|
||
| static const gradient = LinearGradient( | ||
| colors: [surfaceBlue, surfaceGreen, skyBlue], | ||
| stops: [0.25, 0.35, 0.9], | ||
| begin: Alignment.bottomRight, | ||
| end: Alignment.topLeft, | ||
| ); | ||
| final suggestionDecoration = SuggestionDecoration( | ||
| border: Border.all(color: Colors.grey), | ||
| gradient: gradient, | ||
| borderRadius: BorderRadius.circular(24), | ||
| ); | ||
|
|
||
| bool isLoading = false; | ||
| @override | ||
| void initState() { | ||
| // TODO: implement initState | ||
| super.initState(); | ||
| WidgetsBinding.instance.addPostFrameCallback((timeStamp) async { | ||
| final result = await getPaginatedSuggestions(); | ||
| setState(() { | ||
| suggestions.addAll(result); | ||
| }); | ||
| }); | ||
| } | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
| Widget searchChild(x) => Padding( | ||
| padding: const EdgeInsets.symmetric(vertical: 4.0, horizontal: 12), | ||
| child: Text(x, style: TextStyle(fontSize: 20, color: Colors.black)), | ||
| ); | ||
| return Column( | ||
| mainAxisAlignment: MainAxisAlignment.center, | ||
| children: [ | ||
| SearchField( | ||
| onSearchTextChanged: (query) { | ||
| final filter = suggestions | ||
| .where((element) => | ||
| element.toLowerCase().contains(query.toLowerCase())) | ||
| .toList(); | ||
| return filter | ||
| .map((e) => | ||
| SearchFieldListItem<String>(e, child: searchChild(e))) | ||
| .toList(); | ||
| }, | ||
| showEmpty: isLoading, | ||
| onScroll: (offset, maxOffset) async { | ||
| if (offset < maxOffset) return; | ||
| setState(() { | ||
| isLoading = true; | ||
| }); | ||
| final result = await getPaginatedSuggestions(); | ||
| setState(() { | ||
| suggestions.addAll(result); | ||
| isLoading = false; | ||
| }); | ||
| }, | ||
| autovalidateMode: AutovalidateMode.onUserInteraction, | ||
| validator: (value) { | ||
| if (value == null || value.length < 4) { | ||
| return 'error'; | ||
| } | ||
| return null; | ||
| }, | ||
| emptyWidget: Container( | ||
| decoration: suggestionDecoration, | ||
| height: 250, // item*maxItems | ||
| child: const Center( | ||
| child: CircularProgressIndicator( | ||
| color: Colors.black, | ||
| ))), | ||
| key: const Key('searchfield'), | ||
| hint: 'Load Paginated suggestions from network', | ||
| itemHeight: 50, | ||
| scrollbarDecoration: ScrollbarDecoration(), | ||
| onTapOutside: (x) {}, | ||
| suggestionStyle: const TextStyle(fontSize: 20, color: Colors.black), | ||
| searchInputDecoration: InputDecoration( | ||
| focusedBorder: OutlineInputBorder( | ||
| borderRadius: BorderRadius.circular(24), | ||
| borderSide: const BorderSide( | ||
| width: 1, | ||
| color: Colors.grey, | ||
| style: BorderStyle.solid, | ||
| ), | ||
| ), | ||
| border: OutlineInputBorder( | ||
| borderRadius: BorderRadius.circular(24), | ||
| borderSide: const BorderSide( | ||
| width: 1, | ||
| color: Colors.black, | ||
| style: BorderStyle.solid, | ||
| ), | ||
| ), | ||
| fillColor: Colors.white, | ||
| filled: true, | ||
| contentPadding: const EdgeInsets.symmetric( | ||
| horizontal: 20, | ||
| ), | ||
| ), | ||
| suggestionsDecoration: suggestionDecoration, | ||
| suggestions: suggestions | ||
| .map((e) => SearchFieldListItem<String>(e, child: searchChild(e))) | ||
| .toList(), | ||
| focusNode: focus, | ||
| suggestionState: Suggestion.expand, | ||
| onSuggestionTap: (SearchFieldListItem<String> x) { | ||
| focus.unfocus(); | ||
| }, | ||
| ), | ||
| ], | ||
| ); | ||
| } | ||
| } |
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