Flutter 如何使容器（其子容器是textformfield）根据文本行数展开？（颤振）

我正试图使容器根据textformfield中的行数展开，正如您在大多数现代消息传递应用程序中看到的那样。我到处寻找，但毫无结果，我也在寻找一个可能的解决办法。因此，我有容器高度的变化，基于线的数量部分，但容器将不尊重这些变化。我尝试在进行更改后设置一个状态，但它将textformfield改写为一行，并恢复了更改。我的代码可以在下面看到，如果你对如何编辑我的当前代码有任何建议，甚至可以更改我的代码使其按预期工作，我愿意接受所有建议！如果您需要更多信息，请在评论或电子邮件中为我添加标签isis@hanglyde.com 参考

将'dart:ui'导入为ui；
进口“包装：颤振/材料.省道”；
导入“package:flatter/rendering.dart”；
导入“package:photogroup2/recurringwidgets/ombrebackground.dart”；
导入“recurringwidgets/size_config.dart”；
//导入“包：颤振聊天吧/颤振聊天吧.dart”；
导入“chat/chatbar.dart”；
///最大盒子尺寸W 291 H 294
///最小盒子尺寸W 150 H 52
导入“expandedImage.dart”；
类ChatDemo扩展StatefulWidget{
//最终用户；
//ChatDemo（{this.user}）；
@凌驾
_ChatDemoState createState（）=>\u ChatDemoState（）；
}
类\u ChatDemoState使用RouteAware扩展状态{
双初始高度=ChatBubbleState.chatBarHeight；
@凌驾
小部件构建（构建上下文）{
打印（“聊天栏高度$chatbusblestate.chatBarHeight”）；
如果（chatbusblestate.updated）{
打印（“聊天栏高度$chatbusblestate.chatBarHeight”）；
}  
返回脚手架(
resizeToAvoidBottomInset:false，
//resizeToAvoidBottomPadding:true，
正文：安全区(
底部：错误，
上图：错，
child://列(
//mainAxisAlignment:mainAxisAlignment.spaceAround，
//儿童：[
堆叠(
儿童：[
ombreBackground（），
定位(
底部：MediaQuery.of（context）.viewInsets.bottom，
孩子：填充(
填充：仅限边缘组（顶部：750*SizeConfig.高度比），
子：堆栈(
儿童：[
定位(
顶部：22.5*SizeConfig.高度比，
底部：0，
孩子：ClipRRect(
borderRadius：仅限borderRadius(
左上：半径。圆形（32.0），
右上角：半径。圆形（32.0），
),
孩子：ClipRect(
//clipBehavior:Clip.antiAlias，
孩子：背投滤波器(
过滤器：ui.ImageFilter.blur(
sigmaX:20，
5月20日，
),
子：Transform.translate(
偏移量：偏移量（0，20*SizeConfig.heightRatio），
子：容器(
身高：42，
宽度：SizeConfig.screenWidth，
装饰：盒子装饰(
borderRadius：仅限borderRadius(
左上：半径。圆形（32.0），
右上角：半径。圆形（32.0），
),
颜色：
常量颜色（0x00000000）。不透明度（0.00），
),
),
),
),
),
),
),
转换(
偏移量：偏移量（0，-5*SizeConfig.heightRatio），
孩子：聊天吧(
//地址：20，
阿瓦塔拉迪乌斯：22，
化身颜色：颜色（0xFFFFFF），
高度：chatbusblestate.chatBarHeight，//62.5，//OG 60
宽度：SizeConfig.screenWidth，//OG 370
颜色：颜色（0x00000000），
第一个孩子：chatbuble（），
secondChild:secondChild（），
),
),
],
),
),
),
],
),
),
);
}
}
类chatbuble扩展StatefulWidget{
常数聊天泡泡({
关键点，
})：super（key:key）；
@凌驾
ChatBubbleState createState（）=>ChatBubbleState（）；
}
类ChatBubbleState扩展了状态{
静态双高；
静态布尔更新=真；
@凌驾
小部件构建（构建上下文）{
final TextEditingController myController=TextEditingController（）；
int numLines=1；
int charLength=0；
chatBarHeight=62.5；
//= 52.5;//52.5;
int lastIndexNewLine=0；
//打印（$numLines之前）；
//建立标准
返回填充(
填充：仅限常量边集（底部：5），
子：容器(
//页边距：仅限边集（顶部：13，底部：5），
//颜色：颜色，蓝色，
/*约束：BoxConstraints(
最大高度：176，
),*/
//身高：身高，
身高：身高，
宽度：310.0*SizeConfig.widthRatio，
装饰：盒子装饰(
边界半径：边界半径。圆形（27.5），
//颜色：颜色，蓝色，
颜色：常量颜色（0xFFFFFF），
boxShadow：[
箱形阴影(
颜色：常量颜色（0x29000000），
偏移量：偏移量（3,3），
半径：6，
),
],
),
import 'dart:ui' as ui;
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:photosgroup2/recurringwidgets/ombrebackground.dart';
import 'recurringwidgets/size_config.dart';

//import 'package:flutter_chat_bar/flutter_chat_bar.dart';
import 'chat/chatbar.dart';


///MAX BOX SIZE W 291 H 294
///MIN BOX SIZE W 150 H 52
import 'expandedImage.dart';

class ChatDemo extends StatefulWidget {
  //final User user;

  //ChatDemo({this.user});

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

class _ChatDemoState extends State<ChatDemo> with RouteAware {
  double intialHeight = ChatBubbleState.chatBarHeight;
  
  @override

  Widget build(BuildContext context) {
    print('Chat Bar Height $ChatBubbleState.chatBarHeight ');
  if(ChatBubbleState.updated){
    print('Chat Bar Height $ChatBubbleState.chatBarHeight ');
  }  
  
    return Scaffold(
      resizeToAvoidBottomInset: false,
      //resizeToAvoidBottomPadding: true,

      body: SafeArea(
        bottom: false,
        top: false,
        child: //Column(
            //mainAxisAlignment: MainAxisAlignment.spaceAround,
            //children: <Widget>[

            Stack(
          children: <Widget>[
            ombreBackground(),
            

            Positioned(
              bottom: MediaQuery.of(context).viewInsets.bottom,
              child: Padding(
                padding: EdgeInsets.only(top: 750 * SizeConfig.heightRatio),
                child: Stack(
                  children: [
                    Positioned(
                      top: 22.5 * SizeConfig.heightRatio,
                      bottom: 0,
                      child: ClipRRect(
                        borderRadius: BorderRadius.only(
                          topLeft: Radius.circular(32.0),
                          topRight: Radius.circular(32.0),
                        ),
                        child: ClipRect(
                          //clipBehavior: Clip.antiAlias,
                          child: BackdropFilter(
                            filter: ui.ImageFilter.blur(
                              sigmaX: 20,
                              sigmaY: 20,
                            ),
                            child: Transform.translate(
                              offset: Offset(0, 20 * SizeConfig.heightRatio),
                              child: Container(
                                height: 42,
                                width: SizeConfig.screenWidth,
                                decoration: BoxDecoration(
                                  borderRadius: BorderRadius.only(
                                    topLeft: Radius.circular(32.0),
                                    topRight: Radius.circular(32.0),
                                  ),
                                  color:
                                      const Color(0x00000000).withOpacity(0.00),
                                ),
                              ),
                            ),
                          ),
                        ),
                      ),
                    ),
                    Transform.translate(
                      offset: Offset(0, -5 * SizeConfig.heightRatio),
                      child: FlutterChatBar(
                        //addIconSize: 20,
                        avatarRadius: 22,
                        avatarColor: Color(0xffffffff),
                        height: ChatBubbleState.chatBarHeight,//62.5, // OG 60
                        width: SizeConfig.screenWidth, // OG 370
                        color: Color(0x00000000),
                        firstChild: ChatBubble(),
                        secondChild: SecondChild(),
                      ),
                    ),
                  ],
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

class ChatBubble extends StatefulWidget {
  const ChatBubble({
    Key key,
  }) : super(key: key);

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

class ChatBubbleState extends State<ChatBubble> {
  static double chatBarHeight;
  static bool updated = true;

  @override
  Widget build(BuildContext context) {
    final TextEditingController myController = TextEditingController();
    int numLines = 1;
    int charLength = 0;
    chatBarHeight = 62.5;
    //= 52.5;//52.5;
    int lastIndexNewLine = 0;

    //print('before $numLines');
    //builds the bar
    return Padding(
      padding: const EdgeInsets.only(bottom: 5),
      child: Container(
        //margin: EdgeInsets.only(top:13,bottom: 5),
        //color: Colors.blue,
        /*constraints: BoxConstraints(
            maxHeight: 176,
          ),*/
        //height: chatBarHeight,
        height: chatBarHeight,
        width: 310.0 * SizeConfig.widthRatio,
        decoration: BoxDecoration(
          borderRadius: BorderRadius.circular(27.5),
          //color: Colors.blue,
          color: const Color(0xffffffff),
          boxShadow: [
            BoxShadow(
              color: const Color(0x29000000),
              offset: Offset(3, 3),
              blurRadius: 6,
            ),
          ],
        ),
        child:
            /*Padding(
                padding: EdgeInsets.only(
            left: 12 * SizeConfig.widthRatio,
            right: 12 * SizeConfig.widthRatio,
            top: 13 * SizeConfig.heightRatio,
            bottom: 5 * SizeConfig.heightRatio),
                child:*/
            TextFormField(
          expands: true,
          textAlign: TextAlign.start,
          style: TextStyle(
              fontSize: 17 * SizeConfig.textMultiplier,
              color: const Color(0xd9343f4b),
              fontFamily: 'Lato'),
          //textAlign: TextAlign.left,
          maxLines: null,
          minLines: null,
          textCapitalization: TextCapitalization.sentences,
          onChanged: (String e) {
            //String partial =e;
            charLength = e.length;
            numLines = '\n'.allMatches(e).length + 1;
            if (e.contains('\n')) {
              lastIndexNewLine = e.indexOf('\n');
              e = e.substring(lastIndexNewLine);
              charLength = e.length - 1;
            }

            if (charLength > 35) {
              numLines++;
            }
            if (numLines == 1) {
              // chatBarHeight = 52.5;
            }
            if (numLines >= 2) {
              print('I have 2 lines.');
              chatBarHeight = 110;

              updated = true;
              print(chatBarHeight);
              print('uPDATED $updated');
            }
            print('after $numLines');
          },
          controller: myController,
          decoration: InputDecoration.collapsed(
              hintStyle: TextStyle(
                color: Color(0x80343f4b),
                fontFamily: 'Lato',
                fontSize: 15 * SizeConfig.textMultiplier,
                //color: const Color(0xd9343f4b),
              ),
              // hintStyle: ,
              hintText: 'Enter Comment'),
        ),
      ),
      // ), //Padding
      //),
    );
  }
}


class SecondChild extends StatelessWidget {
  const SecondChild({
    Key key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    
    return Transform.translate(
      offset:
          Offset(12.5 * SizeConfig.widthRatio, -2.5 * SizeConfig.heightRatio),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.start,
        mainAxisSize: MainAxisSize.min,
        children: <Widget>[
          
        ],
      ),
    );
  }
}

 

import 'dart:math';
import 'package:flutter/material.dart';
import 'package:flutter_svg/flutter_svg.dart';




class FlutterChatBar extends StatelessWidget {

  //Height of Chat Bar widget.
  final double height;

  //Width of chat bar widget.
  final double width;

  //Color of chat bar widget.
  final Color color;

  //Initial child which is to be displayed inside chat bar widget.
  //Ex- Message Container which is displayed (Can be TextField also)
  final Widget firstChild;

  //Child which comes after animation (when we tap on add Icon button)
  //Ex - 3 Icons which are displayed
  final Widget secondChild;

  //Color of add Icon by default it is white.
  final Color addIconColor;

  //Color of Circle avatar which has a child of Add Icon , by default color is white30
  final Color avatarColor;

  //Radius of circle avatar , by default it is 30.0
  final double avatarRadius;

  //Size of add Icon , by default it is 30.0
  final double addIconSize;

  FlutterChatBar(
    {
      @required this.height,
      @required this.width,
      @required this.color,
      @required this.firstChild,
      @required this.secondChild,
      this.addIconColor = Colors.white,
      this.avatarColor = Colors.white30,
      this.avatarRadius = 43.0,
      this.addIconSize = 43.0
    }
  );
  @override
  Widget build(BuildContext context) {
    return Container(
      height: height,
      width: width,
      decoration: BoxDecoration(
          //borderRadius: BorderRadius.circular(27.5), 
          color: color),
      child: ContentWidget(
        firstChild: firstChild,
        secondChild: secondChild,
        color: color,
        addIconColor: addIconColor,
        addIconSize: addIconSize,
        avatarRadius: avatarRadius,
        avatarColor: avatarColor,
      ),
    );
  }
}

class ContentWidget extends StatefulWidget {


  final Widget firstChild;
  final Widget secondChild;
  final Color color;
  final Color addIconColor;
  final Color avatarColor;
  final double addIconSize;
  final double avatarRadius;

  ContentWidget(
      {this.firstChild,
      this.secondChild,
      this.color,
      this.addIconColor,
      this.avatarColor,
      this.addIconSize,
      this.avatarRadius});
  @override
  _ContentWidgetState createState() => _ContentWidgetState();
}

class _ContentWidgetState extends State<ContentWidget>
    with SingleTickerProviderStateMixin {
  AnimationController _controller;

  //Animation for firstChild (Ex- Message container)
  Animation<double> _firstChildAnimation;

  //Animation for secondChild (Ex- 3 Icons in a row)
  Animation<double> _secondChildAnimation;

  //Animation for add Icon 
  Animation<double> _iconAnimation;

  @override
  void initState() {
    super.initState();
    _controller =
        AnimationController(duration: Duration(milliseconds: 500), vsync: this)
          ..addListener(() {
            setState(() {});
          });

    _firstChildAnimation = Tween(begin: pi / 4, end: 0.0).animate(CurvedAnimation(
        parent: _controller,
        curve: Curves.easeOut,
        reverseCurve: Curves.easeIn));

    _secondChildAnimation = Tween(begin: 0.0, end: pi / 4).animate(CurvedAnimation(
        parent: _controller,
        curve: Curves.easeIn,
        reverseCurve: Curves.easeOut));

    _iconAnimation = Tween(begin: 0.0, end: pi / 4).animate(CurvedAnimation(
        parent: _controller,
        curve: Curves.easeOut,
        reverseCurve: Curves.easeIn));
  }

  @override
  void dispose() {
    super.dispose();
    _controller.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Row(
      mainAxisSize: MainAxisSize.min,
      children: <Widget>[
        /*Padding(
          //padding: const EdgeInsets.all(4.0),
          child:*/ 
          Flexible(
            fit: FlexFit.loose,
            flex: 1,
                      child: GestureDetector(
                onTap: () {
                  if (_controller.status == AnimationStatus.completed) {
                    _controller.reverse();
                  } else {
                    _controller.forward();
                  }
                },
                child: Transform.translate(
                  offset: Offset(20,-3), //15
                                  child: Container(
                                    decoration: BoxDecoration(
                                      borderRadius: BorderRadius.circular(27.5),
                boxShadow: [
                  BoxShadow(
                    color: const Color(0x29000000),
                    offset: Offset(3, 3),
                    blurRadius: 6,
                  ),
                ],
              ),
                                    child: CircleAvatar( ///radius 22
                    backgroundColor: widget.avatarColor,
                    radius: widget.avatarRadius,
                    child: Transform.rotate(
                        angle: _iconAnimation.value,
                        child: SvgPicture.string(
              _svg_nznkw8,
              allowDrawingOutsideViewBox: true,
              fit: BoxFit.fill,
            ),),
                  ),
                                  ),
                ),
              ),
          ),
        //),
        Flexible(
flex:7,
                  child: Stack(
            children: <Widget>[
              Transform.scale(
                scale: _firstChildAnimation.value,
                child: widget.firstChild,
              ),
              Transform.scale(
                scale: _secondChildAnimation.value,
                child: widget.secondChild,
              )
            ],
          ),
        ),
        Flexible
        (
          flex: 1,
          fit: FlexFit.loose,
                  child: Transform.translate(
                    offset: Offset(-20,-3),
                                      child: Container(
                                        decoration: BoxDecoration(
                                          borderRadius: BorderRadius.circular(27.5),
                boxShadow: [
                  BoxShadow(
                    color: const Color(0x29000000),
                    offset: Offset(3, 3),
                    blurRadius: 6,
                  ),
                ],
              ),
                                        child: CircleAvatar( ///radius 22
                    backgroundColor: widget.avatarColor,
                    radius: widget.avatarRadius,
                    child: SvgPicture.string(
                      _svg_52blhh,
                      allowDrawingOutsideViewBox: true,
                      fit: BoxFit.fill,
                    ),),
                                      ),
                ),
        ),
      ],
    );
  }
    }
const String _svg_52blhh = //send
    '<svg viewBox="332.0 762.0 20.0 20.0" ><path transform="translate(332.0, 762.0)" d="M 18.59535026550293 0.1261749565601349 L 0.4879408478736877 10.56938934326172 C -0.2191661894321442 10.97555732727051 -0.1293128132820129 11.95973491668701 0.5738875865936279 12.25654983520508 L 4.726676464080811 13.99838733673096 L 15.95053577423096 4.109749794006348 C 16.16540145874023 3.918381690979004 16.47012329101562 4.211291790008545 16.28650856018066 4.433903217315674 L 6.875344276428223 15.89644432067871 L 6.875344276428223 19.04034423828125 C 6.875344276428223 19.96203422546387 7.988744735717773 20.32524108886719 8.535677909851074 19.65740776062012 L 11.01641273498535 16.63848304748535 L 15.88412189483643 18.6771354675293 C 16.43886947631836 18.91146278381348 17.07174873352051 18.56387710571289 17.1733226776123 17.96634101867676 L 19.98612403869629 1.094730377197266 C 20.11895179748535 0.3058263659477234 19.27120399475098 -0.2643715739250183 18.59535026550293 0.1261749565601349 Z" fill="#343f4b" stroke="none" stroke-width="1" stroke-miterlimit="10" stroke-linecap="butt" /></svg>';
const String _svg_nznkw8 =
    '<svg viewBox="24.0 762.0 22.0 22.0" ><path transform="translate(24.0, 762.0)" d="M 20.4285717010498 8.642857551574707 L 13.35714244842529 8.642857551574707 L 13.35714244842529 1.571428537368774 C 13.35714244842529 0.703705370426178 12.65343761444092 0 11.7857141494751 0 L 10.2142858505249 0 C 9.346562385559082 0 8.642857551574707 0.703705370426178 8.642857551574707 1.571428537368774 L 8.642857551574707 8.642857551574707 L 1.571428537368774 8.642857551574707 C 0.703705370426178 8.642857551574707 0 9.346562385559082 0 10.2142858505249 L 0 11.7857141494751 C 0 12.65343761444092 0.703705370426178 13.35714244842529 1.571428537368774 13.35714244842529 L 8.642857551574707 13.35714244842529 L 8.642857551574707 20.4285717010498 C 8.642857551574707 21.29629516601562 9.346562385559082 22 10.2142858505249 22 L 11.7857141494751 22 C 12.65343761444092 22 13.35714244842529 21.29629516601562 13.35714244842529 20.4285717010498 L 13.35714244842529 13.35714244842529 L 20.4285717010498 13.35714244842529 C 21.29629516601562 13.35714244842529 22 12.65343761444092 22 11.7857141494751 L 22 10.2142858505249 C 22 9.346562385559082 21.29629516601562 8.642857551574707 20.4285717010498 8.642857551574707 Z" fill="#343f4b" stroke="none" stroke-width="1" stroke-miterlimit="10" stroke-linecap="butt" /></svg>';


final TextEditingController myController = TextEditingController();
int numLines = 1;
int charLength = 0;
chatBarHeight = 62.5;
//= 52.5;//52.5;
int lastIndexNewLine = 0;

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    home: ExpandingText(),
  ));
}

class ExpandingText extends StatefulWidget {
  _ExpandingText createState() => _ExpandingText();
}

class _ExpandingText extends State<ExpandingText> {
  TextEditingController myController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Container(
          width: 310.0,
          decoration: BoxDecoration(
            color: const Color(0xffffffff),
            boxShadow: [
              BoxShadow(
                color: const Color(0x29000000),
                offset: Offset(3, 3),
                blurRadius: 6,
              ),
            ],
          ),
          child: TextFormField(
            textAlign: TextAlign.start,
            style: TextStyle(
                fontSize: 17,
                color: const Color(0xd9343f4b),
                fontFamily: 'Lato'),
            maxLines: null,
            textCapitalization: TextCapitalization.sentences,
            controller: myController,
            decoration: InputDecoration(
                hintStyle: TextStyle(
                  color: Color(0x80343f4b),
                  fontFamily: 'Lato',
                  fontSize: 15,
                ),
                // hintStyle: ,
                hintText: 'Enter Comment'),
          ),
        ),
      ),
    );
  }
}