如何使用手势检测器以及如何创建可拖动的顶部栏 [英] how to work with gesture detector and how to create draggable top bar
问题描述
当我尝试将android状态栏制作为应用中的顶部栏时,我使用了手势检测器,但我不知道如何进行操作。如何在上方滑动时将容器隐藏在上方,并按以下方式获取容器:
When I try to make an android status bar like a top bar in my app I use a gesture detector but I don't know how to proceed with it. How do I hide the container above and get the container while swiping like below:
在滑动结束并测量滑动距离后,我该怎么做。顶部栏应向下或向上固定,而不应介于两者之间。我如何对其进行动画处理以使其类似于现在。我试过 onVerticalDrag
等,但我不知道如何操作。
How do I do something after a swipe ends and measure the swipe distance. The top bar should settle down or up and not stay in-between. How do I animate it to make it do it similar to how it is now. I tried onVerticalDrag
etc but I don't have an idea how to it.
推荐答案
Flutter Slivers可以为您做到这一点。
Flutter Slivers can do that for you.
检查以下代码:
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body:NestedScrollView(
headerSliverBuilder: (BuildContext context, bool _) {
return <Widget>[
SliverAppBar(
expandedHeight: 200.0,
floating: true,
pinned: true,
snap: true,
flexibleSpace: FlexibleSpaceBar(
centerTitle: true,
title: Text("Collapsing Toolbar",
style: TextStyle(
color: Colors.white,
fontSize: 16.0,
),
),
),
),
];
},
body: Center(
child: Text("My Fancy Text"),
),
),
),
);
}
}
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