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dart - 将动画滑动到底部

转载 作者:行者123 更新时间:2023-12-03 02:38:56 25 4
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我在页面底部有一个点指示器。我需要在滑动到底部5秒钟后将其隐藏。当用户移动到其他页面时,显示的点会滑到顶部,最后在5秒钟后再次隐藏。现在,这些点会在淡出5秒后隐藏起来,但是我需要其他类型的动画。

import 'package:flutter/material.dart';
import 'package:iGota/screens/partials/dots_indicator.dart';
import 'package:iGota/screens/posts_page.dart';
import 'package:iGota/screens/maps_page.dart';

class HomePage extends StatefulWidget {
static String tag = 'home-page';

@override
_MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<HomePage> {
final _controller = new PageController();
static const _kDuration = const Duration(milliseconds: 300);
static const _kCurve = Curves.ease;
final _kArrowColor = Colors.black.withOpacity(0.8);
bool _visible = true;

void initState() {
super.initState();
Future.delayed(Duration(milliseconds: 5)).then((_) => _visible = !_visible);
}

@override
Widget build(BuildContext context) {
final List<Widget> _pages = <Widget>[
new ConstrainedBox(
constraints: const BoxConstraints.expand(),
child: new FlatButton(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
FlatButton(
onPressed: () {
Navigator.pushNamed(context, PostsPage.tag);
},
child: Column(
children: <Widget>[
IconButton(
icon:
Icon(Icons.save_alt, color: Colors.white, size: 30.0),
onPressed: () {
Navigator.pushNamed(context, PostsPage.tag);
},
),
Text(
"Contenedores",
style: TextStyle(color: Colors.white, fontSize: 20.0),
)
],
),
),
],
),
splashColor: Colors.white,
color: Colors.blue[300],
onPressed: () {
Navigator.pushNamed(context, PostsPage.tag);
},
),
),
new ConstrainedBox(
constraints: const BoxConstraints.expand(),
child: new FlatButton(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
FlatButton(
onPressed: () {
Navigator.pushNamed(context, MapsPage.tag);
},
child: Column(
children: <Widget>[
IconButton(
icon: Icon(Icons.bubble_chart,
color: Colors.white, size: 30.0),
onPressed: () {
Navigator.pushNamed(context, MapsPage.tag);
},
),
Text(
"Válvulas",
style: TextStyle(color: Colors.white, fontSize: 20.0),
)
],
),
),
],
),
splashColor: Colors.white,
color: Colors.red[300],
onPressed: () {
Navigator.pushNamed(context, MapsPage.tag);
},
),
),
];

return new Scaffold(
body: new IconTheme(
data: new IconThemeData(color: _kArrowColor),
child: new Stack(
children: <Widget>[
new PageView.builder(
physics: new AlwaysScrollableScrollPhysics(),
controller: _controller,
itemCount: _pages.length,
itemBuilder: (BuildContext context, int index) {
this._visible=true;
return _pages[index % _pages.length];
},
),
new Positioned(
bottom: 0.0,
left: 0.0,
right: 0.0,
child: AnimatedOpacity(
opacity: _visible ? 1.0 : 0.0,
duration: Duration(milliseconds: 3000),
child: new Container(
color: Colors.grey[800].withOpacity(0.5),
padding: const EdgeInsets.all(20.0),
child: new Center(
child: new DotsIndicator(
controller: _controller,
itemCount: _pages.length,
onPageSelected: (int page) {
_controller.animateToPage(
page,
duration: _kDuration,
curve: _kCurve,
);
},
),
),
),
),
)
],
),
),
);
}
}

我认为 position transition会对我有所帮助,但是我不知道该如何在不重写的情况下将其添加到我的代码中。那么有人可以帮助我吗?

更新
import 'package:flutter/material.dart';
import 'package:iGota/screens/partials/dots_indicator.dart';
import 'package:iGota/screens/posts_page.dart';
import 'package:iGota/screens/maps_page.dart';

class HomePage extends StatefulWidget {
static String tag = 'home-page';

@override
HomePageState createState() => new HomePageState();
}

class HomePageState extends State<HomePage>
with SingleTickerProviderStateMixin {
final _controller = new PageController();
static const _kDuration = const Duration(milliseconds: 300);
static const _kCurve = Curves.ease;
final _kArrowColor = Colors.black.withOpacity(0.8);
AnimationController controller;
Animation<Offset> offset;

@override
void initState() {
super.initState();

controller =AnimationController(vsync: this, duration: Duration(seconds: 1));
Future.delayed(Duration(seconds: 5)).then((_) => controller.forward());

offset = Tween<Offset>(begin: Offset.zero, end: Offset(0.0, 1.0))
.animate(controller);
}

@override
Widget build(BuildContext context) {
GestureDetector(onTap: () {
setState(() {
controller.reverse();
});
});
final List<Widget> _pages = <Widget>[
new ConstrainedBox(
constraints: const BoxConstraints.expand(),
child: new FlatButton(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
FlatButton(
onPressed: () {
Navigator.pushNamed(context, PostsPage.tag);
},
child: Column(
children: <Widget>[
IconButton(
icon:
Icon(Icons.save_alt, color: Colors.white, size: 30.0),
onPressed: () {
Navigator.pushNamed(context, PostsPage.tag);
},
),
Text(
"Contenedores",
style: TextStyle(color: Colors.white, fontSize: 20.0),
)
],
),
),
],
),
splashColor: Colors.white,
color: Colors.blue[300],
onPressed: () {
Navigator.pushNamed(context, PostsPage.tag);
},
),
),
new ConstrainedBox(
constraints: const BoxConstraints.expand(),
child: new FlatButton(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
FlatButton(
onPressed: () {
Navigator.pushNamed(context, MapsPage.tag);
},
child: Column(
children: <Widget>[
IconButton(
icon: Icon(Icons.bubble_chart,
color: Colors.white, size: 30.0),
onPressed: () {
Navigator.pushNamed(context, MapsPage.tag);
},
),
Text(
"Válvulas",
style: TextStyle(color: Colors.white, fontSize: 20.0),
)
],
),
),
],
),
splashColor: Colors.white,
color: Colors.red[300],
onPressed: () {
Navigator.pushNamed(context, MapsPage.tag);
},
),
),
];

return new Scaffold(
body: new IconTheme(
data: new IconThemeData(color: _kArrowColor),
child: new Stack(
children: <Widget>[
new PageView.builder(
physics: new AlwaysScrollableScrollPhysics(),
controller: _controller,
itemCount: _pages.length,
itemBuilder: (BuildContext context, int index) {
return _pages[index % _pages.length];
},
),
new Positioned(
bottom: 0.0,
left: 0.0,
right: 0.0,
child: SlideTransition(
position: offset,
child: new Container(
color: Colors.grey[800].withOpacity(0.5),
padding: const EdgeInsets.all(20.0),
child: new Center(
child: new DotsIndicator(
controller: _controller,
itemCount: _pages.length,
onPageSelected: (int page) {
_controller.animateToPage(
page,
duration: _kDuration,
curve: _kCurve,
);
},
),
),
),
),
)
],
),
),
);
}
}

现在我需要在用户触摸屏时调用controller.reverse ...

最佳答案

要为指标创建滑动动画(如果我理解您的要求正确),我只建议使用SlideTransition小部件。将其集成到您现有的代码中不需要太多的工作。

下面的代码显示了SlideTransition的最小示例。如果要在从一个屏幕到另一个屏幕的导航期间继续显示,则必须将其绘制在导航器上方的层中。

如果您不喜欢使用Stack而选择而不是,则可以使用Overlay中给出的flutter的answer功能。通过在
导航过渡期间将动画显示为,这也将解决斗争。

import 'package:flutter/material.dart';

void main() {
runApp(MyApp());
}

class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Home(),
);
}
}

class Home extends StatefulWidget {
@override
State<StatefulWidget> createState() => HomeState();
}

class HomeState extends State<Home> with SingleTickerProviderStateMixin {
AnimationController controller;
Animation<Offset> offset;

@override
void initState() {
super.initState();

controller =
AnimationController(vsync: this, duration: Duration(seconds: 1));

offset = Tween<Offset>(begin: Offset.zero, end: Offset(0.0, 1.0))
.animate(controller);
}

@override
Widget build(BuildContext context) {
return Scaffold(
body: Stack(
children: <Widget>[
Center(
child: RaisedButton(
child: Text('Show / Hide'),
onPressed: () {
switch (controller.status) {
case AnimationStatus.completed:
controller.reverse();
break;
case AnimationStatus.dismissed:
controller.forward();
break;
default:
}
},
),
),
Align(
alignment: Alignment.bottomCenter,
child: SlideTransition(
position: offset,
child: Padding(
padding: EdgeInsets.all(50.0),
child: CircularProgressIndicator(),
),
),
)
],
),
);
}
}

关于dart - 将动画滑动到底部,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53278792/

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