如何用颤振制作顶部导航抽屉？

Question

我正在尝试打开导航抽屉，如底部 sheet，在 appBar 按钮上单击。我浏览了它，但找不到任何解决方案。

见下图：

我尝试的代码：

 return Scaffold(
      backgroundColor: Colors.transparent,
      body: Container(
        height: MediaQuery.of(context).size.height/2,
        //constraints: BoxConstraints.expand(),
        decoration: BoxDecoration(
          color: Color.fromARGB(255, 255, 255, 255),
        ),
      )
    );

但是背景是黑色的，看不到上一页的局部视图。

Answer 1

flutter中有一个widgetBackDrop可以实现你want.You需要使用的功能backdrop 0.2.7library.You可以参考Flutter Backdrop

Answer 2

您可以查看示例小部件BackDrop

我想如果你改变顶部和底部的位置，一切都会完美

Animation<RelativeRect> _getPanelAnimation(BoxConstraints constraints) {
  final double height = constraints.biggest.height;
  final double top = height - _PANEL_HEADER_HEIGHT;
  final double bottom = -_PANEL_HEADER_HEIGHT;
  return new RelativeRectTween(
    begin: new RelativeRect.fromLTRB(0.0, top, 0.0, bottom),
    end: new RelativeRect.fromLTRB(0.0, 0.0, 0.0, 0.0),
  ).animate(new CurvedAnimation(parent: _controller, curve: Curves.linear));
}

Answer 3

最后我用 SlideTransition() Widget 添加了动画。因为我没有得到任何完美的解决方案，但它运行完美，我很满意:)。


 new IconButton(
    icon: new Image.asset('assets/images/ui-16px-3-funnel-40.png'),
    onPressed: () {        
     showDialog(
      context: context,
      child: FiltersPage()
     );
   },
 ),





import 'package:flutter/material.dart';

class FiltersPage extends StatefulWidget {
  @override
  _FiltersPageState createState() => _FiltersPageState();
}

class _FiltersPageState extends State<FiltersPage> with SingleTickerProviderStateMixin{

  AnimationController controller;
  Animation<Offset> slideAnimation;

  @override
  void initState() {
    controller =  AnimationController(vsync: this, duration: Duration(milliseconds: 450)); 
    slideAnimation = Tween<Offset>(begin: Offset(0.0, -4.0), end: Offset.zero)
      .animate(CurvedAnimation(parent: controller, curve: Curves.decelerate));
    controller.addListener(() {
      setState(() {});
    });
    controller.forward();
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return SlideTransition(
      position: slideAnimation,
      child: Scaffold(
        backgroundColor: Colors.transparent,
        appBar:AppBar(.......)
        body: Container(
        padding: const EdgeInsets.all(13.0),
          height: MediaQuery.of(context).size.height/2.7,
          width: MediaQuery.of(context).size.width,
          decoration: BoxDecoration(
            color: Color.fromARGB(255, 255, 255, 255),
          ),
         child:Column(.....)
       )
    );
  }
}

Answer 4

我使用 PageRouteBuilder 做了类似的事情，它是 DialogBuilder 的父级，带有动画参数，您还可以设置暗淡的颜色等。比如说，在主小部件中你有一个按钮：

TextButton(
        child: Text("open drawer"),
        onPressed: () {
          Navigator.of(context).push(_createRoute());
        },
      )

然后是带有动画等的路线构建器：

  Route _createRoute() {
    return PageRouteBuilder(
      pageBuilder: (context, animation, secondaryAnimation) => TopDrawer(),
      transitionsBuilder: (context, animation, secondaryAnimation, child) {
        const begin = Offset(0.0, -4.0);
        const end = Offset.zero;
        const curve = Curves.decelerate;
        var tween = Tween(begin: begin, end: end).chain(CurveTween(curve: curve));

        return SlideTransition(
          position: tween.animate(animation),
          child: child,
        );
      },
      opaque: false,
      barrierDismissible: true,
      barrierColor: Color.fromRGBO(100, 100, 100, 0.5), //color of the grayed under
      transitionDuration: Duration(milliseconds: 450),
      reverseTransitionDuration: Duration(milliseconds: 450),
    );
  }

它显示的抽屉页面：

import 'package:flutter/material.dart';

class TopDrawer extends StatelessWidget {
  const TopDrawer({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Container(
          height: MediaQuery.of(context).size.height/2,
          width: MediaQuery.of(context).size.width,
          child: Text("some content here"),
          color: Colors.green,
        ),
      ],
    );
  }
}

如何用颤振制作顶部导航抽屉？

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