[英]Using Expanded widget with Column in flutter
我試圖在 Column 中使用 Expanded 小部件,我嘗試了各種方法,但似乎沒有任何效果!
到目前為止,我已經成功構建了這個:
但正如它所顯示的那樣,我放在 Expanded 小部件中的列表視圖位於其他小部件下方,(並且展開的小部件正在滾動,但頂部的小部件處於固定位置),我試圖將展開的小部件放在另一列中,並且還嘗試將兩者放入單獨的擴展小部件中,但似乎沒有任何效果,
我真的很感謝你的幫助
這是我生成上面圖像的代碼:
import 'package:fluapp/constants.dart';
import 'package:fluapp/models/music_model.dart';
import 'package:fluapp/widgets/custom_button_widget.dart';
import 'package:fluapp/widgets/custom_progress_widget.dart';
import 'package:flutter/material.dart';
class PlayerPage extends StatefulWidget {
@override
_PlayerPageState createState() => _PlayerPageState();
}
class _PlayerPageState extends State<PlayerPage>
with SingleTickerProviderStateMixin {
List<MusicModel> _list;
int _playid;
var _value;
AnimationController _controller;
var isPlay;
@override
void initState() {
_playid = 3;
_list = MusicModel.list;
_value = 0.0;
_controller =
AnimationController(vsync: this, duration: Duration(milliseconds: 250));
isPlay = true;
super.initState();
}
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: AppColors.mainColor,
body: Column(
children: <Widget>[
Padding(
padding: const EdgeInsets.all(12),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
CustomButtonWidget(
size: 50,
onTap: () {
Navigator.of(context).pop();
},
child: Icon(
Icons.arrow_back,
color: AppColors.styleColor,
),
),
Text("PLAYING NOW",
style: TextStyle(
color: AppColors.styleColor,
fontWeight: FontWeight.bold,
)),
CustomButtonWidget(
size: 50,
onTap: () {},
child: Icon(
Icons.menu,
color: AppColors.styleColor,
),
),
],
),
),
CustomButtonWidget(
image: "assets/logo.jpg",
size: MediaQuery.of(context).size.width * .7,
borderWidth: 5,
onTap: () {},
),
Text(
"Flume",
style: TextStyle(
color: AppColors.styleColor,
fontSize: 32,
fontWeight: FontWeight.bold,
height: 2,
),
),
Text(
"Flume kucha",
style: TextStyle(
color: AppColors.styleColor.withAlpha(90),
fontSize: 16,
fontWeight: FontWeight.bold,
),
),
Expanded(child: SizedBox()),
Padding(
padding: const EdgeInsets.symmetric(horizontal: 24),
child: customProgressWidget(
value: _value,
labelStart: "1:21",
labelEnd: "3:46",
),
),
Expanded(child: SizedBox()),
Padding(
padding: const EdgeInsets.symmetric(horizontal: 42),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
CustomButtonWidget(
size: 80,
onTap: () {
setState(() {
if (_value > .1) {
_value -= .1;
}
});
},
child: Icon(
Icons.fast_rewind,
color: AppColors.styleColor,
),
borderWidth: 5,
),
CustomButtonWidget(
size: 80,
onTap: () {
if (_controller.value == 0.0) {
_controller.forward();
setState(() {
isPlay = false;
});
} else {
_controller.reverse();
setState(() {
isPlay = true;
});
}
},
child: AnimatedIcon(
icon: AnimatedIcons.pause_play,
progress: _controller,
color: isPlay ? Colors.white : AppColors.styleColor,
),
borderWidth: 5,
isActive: isPlay,
),
CustomButtonWidget(
size: 80,
onTap: () {
setState(() {
if (_value < .9) {
_value += .1;
}
});
},
child: Icon(
Icons.fast_forward,
color: AppColors.styleColor,
),
borderWidth: 5,
),
],
),
),
SizedBox(height: 25),
//to here
Expanded(
child: ListView.builder(
itemCount: _list.length,
padding: EdgeInsets.all(5),
itemBuilder: (context, index) {
return GestureDetector(
onTap: () {
setState(() {
_playid = _list[index].id;
});
},
child: Container(
decoration: BoxDecoration(
color: _list[index].id == _playid
? AppColors.activeColor
: AppColors.mainColor,
borderRadius: BorderRadius.all(
Radius.circular(20),
),
),
padding: EdgeInsets.all(16),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
_list[index].title,
style: TextStyle(
color: AppColors.styleColor,
fontSize: 16,
),
),
Text(
_list[index].album,
style: TextStyle(
color: AppColors.styleColor.withAlpha(90),
fontSize: 16,
),
),
],
),
CustomButtonWidget(
child: Icon(
_list[index].id == _playid
? Icons.pause
: Icons.play_arrow,
color: _list[index].id == _playid
? Colors.white
: AppColors.styleColor,
),
size: 50,
isActive: _list[index].id == _playid,
onTap: () {
setState(() {
_playid = _list[index].id;
});
},
),
],
),
),
);
},
),
),
],
),
);
} }
目前,您的外欄決定沒有滾動行為。 您可以用SingleChildScrollable
將其包裝起來,但隨后您將面臨非靈活區域中靈活子項的問題。 保持靈活布局的一種解決方案是使用 MediaQuery 並將一個大框定義為您的靈活區域:
return Scaffold(
body: ListView(
children: [
SizedBox(
height: MediaQuery.of(context).size.height - 100,
child: Column(
children: [
// Your flexible media player widgets
],
),
),
ListView.builder(
shrinkWrap: true,
primary: false,
itemCount: 10,
itemBuilder: (_, __) {
return ListTile(
title: Text('song title'),
);
},
),
],
),
);
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.