import 'package:flutter/material.dart';

//触摸回调组件
class TouchCallBack extends StatefulWidget {

  //子组件
  final Widget child;

  //回调函数
  final VoidCallback onPressed;

  final bool isfeed;

  //背景色
  final Color backgroud;

  //传入参数列表
  const TouchCallBack({Key key, @required this.onPressed, this.isfeed, this.backgroud,@required this.child}) : super(key: key);

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

class _TouchCallBackState extends State<TouchCallBack> {

  Color color = Colors.transparent;

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      //使用Container 包裹
      child: Container(
        color: color,
        child: widget.child,
      ),
      onTap: widget.onPressed,
      onPanDown: (d){
        if(widget.isfeed == false) return;
        setState(() {
          color = widget.backgroud;
        });
      },
      onPanCancel: (){
        setState(() {
          color = Colors.transparent;
        });
      },
    );
  }
}