您最多选择25个主题 主题必须以中文或者字母或数字开头,可以包含连字符 (-),并且长度不得超过35个字符
 
 
 
 
 
 

91 行
2.9 KiB

using System;
using System.Collections.Generic;
using System.Diagnostics;
using Unity.UIWidgets.async;
using Unity.UIWidgets.foundation;
using Unity.UIWidgets.material;
using Unity.UIWidgets.painting;
using Unity.UIWidgets.widgets;
namespace UIWidgetsGallery.gallery
{
public delegate Future<string> UpdateUrlFetcher();
internal class Updater : StatefulWidget
{
public Updater(UpdateUrlFetcher updateUrlFetcher, Widget child = null, Key key = null)
:
base(key: key)
{
D.assert(updateUrlFetcher != null);
this.child = child;
this.updateUrlFetcher = updateUrlFetcher;
}
public readonly UpdateUrlFetcher updateUrlFetcher;
public readonly Widget child;
public override State createState()
{
return new UpdaterState();
}
}
internal class UpdaterState : State<Updater>
{
public override void initState()
{
base.initState();
this._checkForUpdates();
}
private static DateTime _lastUpdateCheck;
private void _checkForUpdates()
{
// Only prompt once a day
if (_lastUpdateCheck != null &&
DateTime.Now - _lastUpdateCheck < new TimeSpan(1, 0, 0, 0))
return; // We already checked for updates recently
_lastUpdateCheck = DateTime.Now;
this.widget.updateUrlFetcher.Invoke().then(updateUrl =>
{
if (updateUrl != null)
material_.showDialog<bool>(context: this.context, builder: this._buildDialog).then(wantsUpdate =>
{
if (wantsUpdate != null && (bool) wantsUpdate)
BrowserUtils.launch((string) updateUrl);
});
});
}
private Widget _buildDialog(BuildContext context)
{
ThemeData theme = Theme.of(context);
TextStyle dialogTextStyle =
theme.textTheme.subtitle1.copyWith(color: theme.textTheme.caption.color);
return new AlertDialog(
title: new Text("Update UIWidgets Gallery?"),
content: new Text("A newer version is available.", style: dialogTextStyle),
actions: new List<Widget>
{
new FlatButton(
child: new Text("NO THANKS"),
onPressed: () => { Navigator.pop(context, false); }
),
new FlatButton(
child: new Text("UPDATE"),
onPressed: () => { Navigator.pop(context, true); }
)
}
);
}
public override Widget build(BuildContext context)
{
return this.widget.child;
}
}
}