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git-touch-android-ios-app/lib/scaffolds/long_list.dart

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import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/widgets.dart';
import 'package:git_touch/models/theme.dart';
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import 'package:git_touch/utils/utils.dart';
import 'package:provider/provider.dart';
import '../widgets/loading.dart';
import '../widgets/link.dart';
import '../widgets/error_reload.dart';
class LongListPayload<T, K> {
T header;
int totalCount;
String cursor;
List<K> leadingItems;
List<K> trailingItems;
LongListPayload({
this.header,
this.totalCount,
this.cursor,
this.leadingItems,
this.trailingItems,
});
}
// This is a scaffold for issue and pull request
// Since the list could be very long, and some users may only want to to check trailing items
// We should load leading and trailing items at first fetching, and do load more in the middle
// e.g. https://github.com/reactjs/rfcs/pull/68
class LongListScaffold<T, K> extends StatefulWidget {
final Widget title;
final Widget Function(T headerPayload) trailingBuilder;
final Widget Function(T headerPayload) headerBuilder;
final Widget Function(K itemPayload) itemBuilder;
final Future<LongListPayload<T, K>> Function() onRefresh;
final Future<LongListPayload<T, K>> Function(String cursor) onLoadMore;
LongListScaffold({
@required this.title,
this.trailingBuilder,
@required this.headerBuilder,
@required this.itemBuilder,
@required this.onRefresh,
@required this.onLoadMore,
});
@override
_LongListScaffoldState createState() => _LongListScaffoldState();
}
class _LongListScaffoldState<T, K> extends State<LongListScaffold<T, K>> {
bool loading;
bool loadingMore = false;
String error = '';
LongListPayload<T, K> payload;
@override
void initState() {
super.initState();
_refresh();
}
Future<void> _refresh() async {
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// print('long list scaffold refresh');
setState(() {
error = '';
loading = true;
});
try {
payload = await widget.onRefresh();
} catch (err) {
error = err.toString();
throw err;
} finally {
if (mounted) {
setState(() {
loading = false;
});
}
}
}
Future<void> _loadMore() async {
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// print('long list scaffold load more');
setState(() {
loadingMore = true;
});
try {
var _payload = await widget.onLoadMore(payload.cursor);
payload.totalCount = _payload.totalCount;
payload.cursor = _payload.cursor;
payload.leadingItems.addAll(_payload.leadingItems);
} finally {
if (mounted) {
setState(() {
loadingMore = false;
});
}
}
}
Widget _buildItem(BuildContext context, int index) {
if (index % 2 == 1) {
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return CommonStyle.border;
}
int realIndex = index ~/ 2;
if (realIndex < payload.leadingItems.length) {
return widget.itemBuilder(payload.leadingItems[realIndex]);
} else if (realIndex == payload.leadingItems.length) {
var count = payload.totalCount -
payload.leadingItems.length +
payload.trailingItems.length;
return Container(
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padding: CommonStyle.padding,
decoration: BoxDecoration(
image: DecorationImage(
image: ExactAssetImage('images/progressive-disclosure-line.png',
scale: 2),
repeat: ImageRepeat.repeatX,
),
),
child: Center(
child: Link(
onTap: _loadMore,
child: Container(
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padding: CommonStyle.padding,
decoration: BoxDecoration(
border: Border.all(color: Colors.black12),
),
child: Column(
children: <Widget>[
Text('$count hidden items',
style: TextStyle(color: Colors.black87, fontSize: 15)),
Padding(padding: EdgeInsets.only(top: 4)),
loadingMore
? CupertinoActivityIndicator()
: Text(
'Load more...',
style:
TextStyle(color: Colors.blueAccent, fontSize: 16),
),
],
),
),
),
),
);
} else {
return widget.itemBuilder(
payload.trailingItems[realIndex - payload.leadingItems.length - 1]);
}
}
int get _itemCount {
int count = payload.leadingItems.length + payload.trailingItems.length;
if (payload.totalCount > count) {
count++;
}
return 2 * count; // including bottom border
}
Widget _buildSliver() {
if (error.isNotEmpty) {
return SliverToBoxAdapter(
child: ErrorReload(text: error, onTap: _refresh));
} else if (loading) {
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// TODO:
return SliverToBoxAdapter(child: Loading(more: false));
} else {
return SliverList(
delegate:
SliverChildBuilderDelegate(_buildItem, childCount: _itemCount),
);
}
}
@override
Widget build(BuildContext context) {
switch (Provider.of<ThemeModel>(context).theme) {
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case AppThemeType.cupertino:
List<Widget> slivers = [
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CupertinoSliverRefreshControl(onRefresh: _refresh)
];
if (payload != null) {
slivers.add(
SliverToBoxAdapter(child: widget.headerBuilder(payload.header)),
);
}
slivers.add(_buildSliver());
return CupertinoPageScaffold(
navigationBar: CupertinoNavigationBar(
middle: widget.title,
trailing:
payload == null ? null : widget.trailingBuilder(payload.header),
),
child: SafeArea(
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child: CupertinoScrollbar(
child: CustomScrollView(slivers: slivers),
),
),
);
default:
return Scaffold(
appBar: AppBar(
title: widget.title,
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actions: payload == null
? null
: [widget.trailingBuilder(payload.header)],
),
body: RefreshIndicator(
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onRefresh: _refresh,
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child: Scrollbar(
child: CustomScrollView(slivers: [
if (payload != null)
SliverToBoxAdapter(
child: widget.headerBuilder(payload.header)),
_buildSliver(),
]),
),
),
);
}
}
}