Container组件嵌套chid【Container】，chid【Container】大小调整技巧
场景：有一个全局大小的父Container设置背景色，内部有一个子Container负责装配各种组件，有另一种背景色，且需随装配的组件自适应大小【用于弹出式遮盖层的布局】
问题：子Container会跟随父Container大小，无法自适应
技巧：如代码所示，使用Stack【或者Column，Algin，Center等组件】包一层
Container(
width: ToolScreenWidth,
height: ToolScreenHeight,
color: Color.fromRGBO(0, 0, 0, 0.5),
child: Stack(
children: [
Container(
color: Colors.white,
child: Column(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.start,
children: [
SizedBox(height: ToolStatusBarHeight,),
Container(
width: ToolScreenWidth,
height: 70,
color: Colors.red,
),
Container(
width: ToolScreenWidth,
height: 70,
color: Colors.yellow,
),
Container(
width: ToolScreenWidth,
height: 90,
color: Colors.greenAccent,
),
],
),
),
],
),
);
键盘遮盖输入框问题
场景：在键盘弹出时需要在键盘上附加一个工具view【Container】，在输入框【TextField】外层套一个滚动组件【SingleChildScrollView】，默认输入框会处理键盘遮盖问题【自动向上滚动】，但无法处理工具view的遮盖，在这里需要监听键盘的滚动事件，以及工具view的位置，和输入框的位置以及滚动组件的滚动位置，计算出差值，进行滚动。
输入框遮挡方案
///基础
import 'package:flutter/material.dart';
import 'package:firstproject/app/AppBarCustomBase.dart';
///工具
import 'package:firstproject/until/Tool.dart';
class CrosswordGameSetingPage extends StatefulWidget {
final arguments;
CrosswordGameSetingPage({this.arguments, Key? key}) : super(key: key) {
print("看看页面参数---${this.arguments}");
}
@override
State<CrosswordGameSetingPage> createState() =>
_CrosswordGameSetingPageState();
}
class _CrosswordGameSetingPageState extends State<CrosswordGameSetingPage> with WidgetsBindingObserver {
ScrollController _bgScrController = ScrollController();
///工具UI-GlobalKey
GlobalKey _toolViewlKey = GlobalKey();
///输入框
GlobalKey _filelKey = GlobalKey();
///初始化方法
void initState() {
super.initState();
//监听滚动事件，打印滚动位置
_bgScrController.addListener(() {
print("滚动位置变化--${_bgScrController.offset}"); //打印滚动位置
});
///监听键盘高度变化
WidgetsBinding.instance.addObserver(this);
}
///在页面高度发生变化的时候会触发该回调
@override
void didChangeMetrics() {
super.didChangeMetrics();
WidgetsBinding.instance.addPostFrameCallback((_) {
print('键盘高度---${MediaQuery.of(context).viewInsets.bottom}');
});
}
///析构
@override
void dispose() {
WidgetsBinding.instance.removeObserver(this);
super.dispose();
}
Widget _getBodyWidget(BuildContext context) {
return Container(
width: ToolScreenWidth,
height: ToolScreenHeight,
color: Colors.white,
child: Stack(
alignment: Alignment.topCenter,
children: [
Positioned(
child:Container(
width: ToolScreenWidth,
height: ToolScreenHeight,
color: ToolColorRandomColor(),
child: SingleChildScrollView(
controller: _bgScrController,
child:Column(
children: [
Container(
width: ToolScreenWidth,
height: 300,
color: ToolColorRandomColor(),
),
Container(
width: ToolScreenWidth,
height: 200,
color: ToolColorRandomColor(),
),
Container(
width: ToolScreenWidth,
height: 40,
child: TextField(
key: _filelKey,
controller: TextEditingController(text: "输入框"),
onTap: (){
judgeKeyboardOverspreadTextFile();
},
),
),
Container(
width: ToolScreenWidth,
height: 200,
color: ToolColorRandomColor(),
),
],
)),
),
),
Positioned(
bottom: 0,
child: Container(
key: _toolViewlKey,
width: ToolScreenWidth,
height: 100,
color: Color.fromRGBO(0, 0, 0, 0.5),
child: Text("工具栏"),
),
)
],
),
);
}
///处理键盘遮盖问题
void judgeKeyboardOverspreadTextFile() {
Future.delayed(Duration(milliseconds: 800), () {
final toolViewBox =
this._toolViewlKey.currentContext?.findRenderObject() as RenderBox?;
double boxY = toolViewBox?.localToGlobal(Offset.zero).dy ?? 0;
print(
"我想看看--提示view位置---${toolViewBox?.localToGlobal(Offset.zero)}---${toolViewBox?.size}");
GlobalKey filelKey = _filelKey;
final filebox = filelKey.currentContext?.findRenderObject() as RenderBox?;
double fileboxY = filebox?.localToGlobal(Offset.zero).dy ?? 0;
double fileboxHeight = filebox?.size.height ?? 0;
print(
"我想看看--file位置---${filebox?.localToGlobal(Offset.zero)}---${filebox?.size}");
if (fileboxY + fileboxHeight >= boxY) {
double? scroY =
fileboxY - boxY + fileboxHeight + _bgScrController.offset + 10;
this._bgScrController.animateTo(
scroY,
duration: Duration(milliseconds: 200),
curve: Curves.ease,
);
print("我想看看--滚动位置---${scroY}---");
}
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: RawKeyboardListener(
autofocus: true,
onKey: (event) {
print("键盘----event=${event.toString()}");
},
focusNode: FocusNode(),
child: _getBodyWidget(context),
),
appBar: AppBarCustomBase(
barHeight: 100,
backgroundImageName: 'assets/images/bg_375x90.png',
leadingWidget: GestureDetector(
child: Image.asset(
'assets/images/icon_back.png',
width: 66,
height: 41,
fit: BoxFit.cover,
),
onTap: () {
Navigator.of(context).pop();
},
),
trailingWidget: Image.asset(
'assets/images/icon_share.png',
width: 66,
height: 41,
),
),
);
}
}
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