Dialog 对话框

最简易的对话框面板，包含一个内容组件，可指定影深、背景色、形状等属性。

Dialog基本使用

   <br />【child】 : 动画图标数据   【Widget】<br />【elevation】 : 影深  【double】<br />【backgroundColor】 : 背景色  【Color】<br />【shape】 : 形状   【ShapeBorder】<br />![55.gif](https://cdn.nlark.com/yuque/0/2020/gif/326147/1589442498079-a74bd8cf-b852-4252-81a6-f2f9b1872589.gif#align=left&display=inline&height=364&margin=%5Bobject%20Object%5D&name=55.gif&originHeight=364&originWidth=310&size=253758&status=done&style=none&width=310)

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
class CustomDialog extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Column(
      children: <Widget>[
        _buildRaisedButton(context),
        _buildDialog(),
      ],
    );
  }

  Widget _buildDialog() => Dialog(
      backgroundColor: Colors.white,
      elevation: 5,
      shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.all(Radius.circular(10))),
      child: Container(
        width: 50,
        child: DeleteDialog(),
      ),
    );

  Widget _buildRaisedButton(BuildContext context) => RaisedButton(
          shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.all(Radius.circular(10))),
          color: Colors.blue,
          onPressed: () {
            showDialog(context: context, builder: (ctx) => _buildDialog());
          },
          child: Text(
            'Just Show It !',
            style: TextStyle(color: Colors.white),
          ),

  );
}

class DeleteDialog extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(

      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: <Widget>[
          _buildBar(context),
          _buildTitle(),
          _buildContent(),
          _buildFooter(context),
        ],
      ),
    );
  }

  Widget _buildTitle() {
    return Text(
      'Delete Doucument',
      style: TextStyle(color: Color(0xff5CC5E9), fontSize: 24),
    );
  }

  Widget _buildContent() {
    return Padding(
      padding: const EdgeInsets.all(15.0),
      child: Text(
        '    Hi toly! If you push the conform buttom ,'
        ' You will lose this file. Are you sure wand to do that?',
        style: TextStyle(color: Color(0xffCFCFCF), fontSize: 16),
        textAlign: TextAlign.justify,
      ),
    );
  }

  Widget _buildFooter(context) {
    return Padding(
      padding: const EdgeInsets.only(bottom: 15.0, top: 10,left: 10,right: 10),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: <Widget>[
          Container(
            alignment: Alignment.center,
            height: 40,
            width: 100,
            decoration: BoxDecoration(
                borderRadius: BorderRadius.all(Radius.circular(30)),
                color: Color(0xff73D1EE)),
            child: Text('Yes',
                style: TextStyle(color: Colors.white, fontSize: 16)),
          ),
          InkWell(
            onTap: ()=>Navigator.of(context).pop(),
            child: Container(
              alignment: Alignment.center,
              height: 40,
              width: 100,
              decoration: BoxDecoration(
                  borderRadius: BorderRadius.all(Radius.circular(30)),
                  color: Colors.orangeAccent),
              child: Text('Cancle',
                  style: TextStyle(color: Colors.white, fontSize: 16)),
            ),
          )
        ],
      ),
    );
  }

  _buildBar(context) => Container(
        height: 30,
        alignment: Alignment.centerRight,
        margin: EdgeInsets.only(right: 10, top: 5),
        child: InkWell(
          onTap: ()=>Navigator.of(context).pop(),
          child: Icon(
            Icons.close,
            color: Color(0xff82CAE3),
          ),
        ),
      );
}