flutter 选中按钮自定义

import 'dart:ffi';

import 'package:flutter/material.dart';

class setting extends StatefulWidget {

  @override

  _settingStatecreateState() =>_settingState();

}

class_settingStateextendsState {

  @override

  Widget build(BuildContext context) {

    return Scaffold(

        body:Container(

      width:double.infinity,

      child:Column(

          mainAxisAlignment:MainAxisAlignment.center,

          crossAxisAlignment:CrossAxisAlignment.center,

          children: [

            customButton(

              '状态按钮',

              normalColor:Colors.white,

              normalTextColor:Colors.black,

              selectedColor:Colors.red,

              borderWidth:1,

              normalBorderColor:Colors.grey,

              selectedBorderColor:Colors.blue,

              selected:false,

              touchDown: (boolselected) {

                if(selected) {

                  returnfalse;

                }else{

                  returntrue;

                }

              },

            )

          ]),

    ));

  }

}

classcustomButtonextendsStatefulWidget{

  boolselected =false;

  doubleborderWidth;

  ColornormalColor =Colors.white;

  StringnormalText ='';

  ColornormalTextColor =Colors.black;

  ColornormalBorderColor =Colors.black;

  ColorselectedColor;

  StringselectedText ='';

  ColorselectedTextColor;

  ColorselectedBorderColor;

  FunctiontouchDown;

  customButton(this.normalText,

      {this.normalColor,

      this.normalTextColor,

      this.normalBorderColor,

      this.selectedColor,

      this.selectedText,

      this.selectedTextColor,

      this.selectedBorderColor,

      this.selected ,

      this.touchDown,

      this.borderWidth =0}) {

    if(this.selectedColor ==null) {

      this.selectedColor =this.normalColor;

    }

    if(this.selectedText ==null) {

      this.selectedText =this.normalText;

    }

    if(this.selectedTextColor ==null) {

      this.selectedTextColor =this.normalTextColor;

    }

    if(this.selectedBorderColor ==null) {

      this.selectedBorderColor =this.normalBorderColor;

    }

  }

  @override

  _customButtonStatecreateState() =>_customButtonState(this.normalText,

      normalColor:this.normalColor,

      normalTextColor:this.normalTextColor,

      normalBorderColor:this.normalBorderColor,

      selectedColor:this.selectedColor,

      selectedText:this.selectedText,

      selectedTextColor:this.selectedTextColor,

      selected:this.selected,

      selectedBorderColor:this.selectedBorderColor,

      touchDown:this.touchDown,

      borderWidth:this.borderWidth);

}

class_customButtonStateextendsState {

  boolselected;

  ColornormalColor;

  StringnormalText;

  ColornormalTextColor;

  ColornormalBorderColor;

  ColorselectedColor;

  StringselectedText;

  ColorselectedTextColor;

  ColorselectedBorderColor;

  doubleborderWidth;

  FunctiontouchDown;

  _customButtonState(this.normalText,

      {this.normalColor,

      this.normalTextColor,

      this.normalBorderColor,

      this.selectedColor,

      this.selectedText,

      this.selectedTextColor,

      this.selectedBorderColor,

      this.selected,

      this.touchDown,

      this.borderWidth}) {}

  @override

  Widget build(BuildContext context) {

    return  RaisedButton(

        autofocus:true,

        color:this.selected ?this.selectedColor :this.normalColor,

        shape:RoundedRectangleBorder(

            borderRadius:BorderRadius.all(Radius.circular(1)),

            side:BorderSide(

                color:this.selected

                    ?this.selectedBorderColor

                    :this.normalBorderColor,

                width:this.borderWidth,

                style:BorderStyle.solid)),

        onPressed: () {

          boolvalue =this.touchDown(this.selected);

          if(value !=this.selected) {

            setState(() {

              this.selected = value;

            });

          }

        },

        child:Container(

            child:Row(       

              mainAxisSize:MainAxisSize.min,       

              mainAxisAlignment:MainAxisAlignment.center,

              crossAxisAlignment:CrossAxisAlignment.center,

              children: [

          Text(

            this.selected ?this.selectedText :this.normalText,

            style:TextStyle(

                color:this.selected

                    ?this.selectedTextColor

                    :this.normalTextColor),

          ),

          SizedBox(width:30),

          Text(

            this.selected ?this.selectedText :this.normalText,

            style:TextStyle(

                color:this.selected

                    ?this.selectedTextColor

                    :this.normalTextColor),

          ),

        ]

        ),

      ),

    );

  }

}

参考链接：https://www.jianshu.com/p/452ecdb3d419