flutter-go/lib/widgets/elements/Form/Button/RawMaterialButton/index.dart

/// Created with 菜鸟手册.
/// User: 一晟
/// Date: 2018/11/14
/// Time: 下午4:31
/// email: zhu.yan@alibaba-inc.com
/// target: RawMaterialButton 的示例
/// 对应文档地址:https://docs.flutter.io/flutter/material/RawMaterialButton-class.html
import 'package:flutter_markdown/flutter_markdown.dart';
import 'dart:math';

import 'package:flutter/material.dart';
import 'package:flutter_go/components/widget_demo.dart';
import './demo.dart' as rawMaterialButton;


const String _rawMaterialText0 =
"""### **简介**
> RawMaterial button “RawMaterial 按钮”
- 基于 Semantics，Material 和InkWell 小部件创建按钮;
- 此类不使用当前 Theme 或 ButtonTheme 来计算未指定参数的默认值。它旨在用于自定义 Material button，可选择包含主题或特定于应用程序源的默认值;
""";

const String _rawMaterialText1 =
"""### **基本用法**
> 参数的默认的 button 和禁用 button
""";

const String _rawMaterialText2 =
"""### **进阶用法**
> 更改项参数的自定义
""";

class Demo extends StatefulWidget {
  static const String routeName = '/element/Form/Button/RawMaterialButton';

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

class _DemoState extends State<Demo> {
  String buttonShapeType = 'border'; // 边框类型
  void setButtonShapeType(){
    //String _buttonShapeType = (buttonShapeType == 'border') ? 'radius' : 'border';
    if( mounted ) {
      this.setState(() {
        //buttonShapeType = _buttonShapeType;
      });
    }
  }
  @override
  Widget build(BuildContext context) {
    return WidgetDemo(
      title: 'RawMaterialButton',
      codeUrl: 'elements/Form/Button/RawMaterialButton/demo.dart',
      contentList: [allRawMaterialButtons(context,this)],
      docUrl: 'https://docs.flutter.io/flutter/material/RawMaterialButton-class.html',
    );
  }
}


 // 所有的 RawMaterialButton 按钮
Widget allRawMaterialButtons(BuildContext context,_DemoState that){
  final ShapeBorder buttonShape = drawShape(that.buttonShapeType);
  return Container(
    //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
      child: Column(
        //mainAxisSize: MainAxisSize.max,
          children: <Widget>[
            MarkdownBody(data: _rawMaterialText0),
            textAlignBar(_rawMaterialText1),
            ButtonBar(
              alignment: MainAxisAlignment.spaceAround,
              mainAxisSize: MainAxisSize.max,
              children: <Widget>[
                rawMaterialButton.RawMaterialButtonDefault(),
                SizedBox(width: 20.0), // 间距
                rawMaterialButton.RawMaterialButtonDefault(false),
              ],
            ),
            textAlignBar(_rawMaterialText2),
            SizedBox(height: 10.0),
            rawMaterialButton.RawMaterialButtonCustom('主要按钮',Colors.blue,buttonShape),
            SizedBox(height: 10.0),
            rawMaterialButton.RawMaterialButtonCustom('成功按钮',Colors.green,buttonShape),
            SizedBox(height: 10.0),
            rawMaterialButton.RawMaterialButtonCustom('信息按钮',Colors.grey,buttonShape),
            SizedBox(height: 10.0),
            rawMaterialButton.RawMaterialButtonCustom('警告按钮',Colors.orange,buttonShape),
            SizedBox(height: 10.0),
            rawMaterialButton.RawMaterialButtonCustom('危险按钮',Colors.pink,buttonShape),
            SizedBox(height: 10.0),
            rawMaterialButton.RawMaterialButtonCustom( '点击切换，观察字体变化', Colors.blue, buttonShape,
                    () => that.setButtonShapeType()),
            SizedBox(height: 20.0)
          ])
  );
}

  // alert 弹框
  // context:容器的父级
// void _showMessage(String name, BuildContext context) {
//   showDialog(
//     // alert 的父级
//     context: context,
//     builder: (BuildContext context) {
//       return AlertDialog(
//           title:  Text('提示'),
//           content:  Text(name),
//           actions: <Widget>[
//              FlatButton(
//               // alert 的取消按钮
//                 onPressed: () {
//                   // 取消的事件
//                   Navigator.of(context).pop(true);
//                 },
//                 child:  Text('取消'))
//           ]);
//     }
//   );
// }

// 带align的text
Widget textAlignBar(String txt){
  //style:  TextStyle(fontSize: 15.5, height: 1.2),textAlign:TextAlign.left
  return  Align(
      alignment: FractionalOffset.centerLeft,
      child: Column(
          children: <Widget>[
            SizedBox(height: 20.0),
            MarkdownBody(data: txt)
            // Text(txt, style:  TextStyle(fontSize: 15.5,height: 1.2,color:Colors.blue),textAlign:TextAlign.left)
          ])
  );
}

// 绘制边框信息,比如是否有边框,是否是圆角
ShapeBorder drawShape(String type){
  final Color _color = _randomColor();
  final borderWidth = Random.secure().nextInt(5).toDouble();
  final radiusWidth = Random.secure().nextInt(50).toDouble();

  switch(type){
    case 'border':
      return Border.all(
        // 设置边框样式
        width: borderWidth,
        color: _color,
        style: BorderStyle.solid,
      );
      break;
    case 'radius':
      return RoundedRectangleBorder(
        side: BorderSide( // 保留原来的边框样式
          width: borderWidth,
          color: _color,
          style: BorderStyle.solid,
        ),
        borderRadius: BorderRadius.only(
          topRight: Radius.circular(radiusWidth),
          topLeft: Radius.circular(radiusWidth),
          bottomLeft: Radius.circular(radiusWidth),
          bottomRight: Radius.circular(radiusWidth),
        ),
      );
      break;
    default:
      return null;
  }
}

// 取随机颜色
Color _randomColor() {
  var red = Random.secure().nextInt(255);
  var greed = Random.secure().nextInt(255);
  var blue = Random.secure().nextInt(255);
  return Color.fromARGB(255, red, greed, blue);
}