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97 行
3.5 KiB

using System;
using System.Collections.Generic;
using UIWidgetsGallery.gallery;
using Unity.UIWidgets.async2;
using Unity.UIWidgets.foundation;
using Unity.UIWidgets.material;
using Unity.UIWidgets.widgets;
namespace UIWidgetsGallery.demo.material
{
internal enum IndicatorType
{
overscroll,
refresh
}
internal class OverscrollDemo : StatefulWidget
{
public OverscrollDemo(Key key = null) : base(key: key)
{
}
public static readonly string routeName = "/material/overscroll";
public override State createState()
{
return new OverscrollDemoState();
}
}
internal class OverscrollDemoState : State<OverscrollDemo>
{
private readonly GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>.key();
private readonly GlobalKey<RefreshIndicatorState> _refreshIndicatorKey = GlobalKey<RefreshIndicatorState>.key();
private static readonly List<string> _items = new List<string>
{
"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N",
};
private Future _handleRefresh()
{
Completer completer = Completer.create();
Timer.create(new TimeSpan(0, 0, 0, 3), () => { completer.complete(); });
return completer.future.then((_) =>
{
_scaffoldKey.currentState?.showSnackBar(new SnackBar(
content: new Text("Refresh complete"),
action: new SnackBarAction(
label: "RETRY",
onPressed: () => { _refreshIndicatorKey.currentState.show(); }
)
));
});
}
public override Widget build(BuildContext context)
{
return new Scaffold(
key: _scaffoldKey,
appBar: new AppBar(
title: new Text("Pull to refresh"),
actions: new List<Widget>
{
new MaterialDemoDocumentationButton(OverscrollDemo.routeName),
new IconButton(
icon: new Icon(Icons.refresh),
tooltip: "Refresh",
onPressed: () => { _refreshIndicatorKey.currentState.show(); }
)
}
),
body: new RefreshIndicator(
key: _refreshIndicatorKey,
onRefresh: _handleRefresh,
child: new Scrollbar(
child: ListView.builder(
padding: material_.kMaterialListPadding,
itemCount: _items.Count,
itemBuilder: (BuildContext subContext, int index) =>
{
string item = _items[index];
return new ListTile(
isThreeLine: true,
leading: new CircleAvatar(child: new Text(item)),
title: new Text($"This item represents {item}."),
subtitle: new Text(
"Even more additional list item information appears on line three.")
);
}
)
)
)
);
}
}
}