flutter-go/lib/widgets/elements/Form/Button/FlatButton/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: FlatButton 的示例
 * 对应文档地址:https://docs.flutter.io/flutter/material/FlatButton-class.html
 */
import 'package:flutter_go/components/widget_demo.dart';

import 'package:flutter/material.dart';

import 'package:flutter_markdown/flutter_markdown.dart';
import './demo.dart' as flatButton;



const String _flatText0 =
"""### **简介**
> FlatButton 是显示在（零高程）material widget 上的文本标签
- 通过填充颜色对触摸作出反应在工具栏上；
- FlatButtons 故意不具有可见边框，因此必须依赖于它们相对于其他内容的位置以用于上下文；
- 在对话框和卡片中，它们应该组合在一个底角中。避免使用平面按钮，它们会与其他内容混合，例如在列表中间；""";

const String _flatText1 =
"""### **基本用法**
> 参数的默认的 button 和禁用 button
- 如果 onPressed 回调为null，则该按钮将被禁用，不会对触摸做出反应，并且将按 disabledColor 属性而不是color属性指定的颜色进行着色；
- 如果您尝试更改按钮的颜色并且没有任何效果，请检查您是否正在传递非null onPressed处理程序；。""";


const String _flatText2 =
"""### **进阶用法1**
> FlatButton.icon ，button 图标和标签的 widget 创建文本按钮；""";

const String _flatText3 =
"""### **进阶用法2**
> 更改参数的自定义,比如:边框，点击效果，内容文字颜色等；
- 要使应用程序的一部分具有交互式，使用 ink splashes，请考虑使用InkWell;
- Flat button 的最小尺寸为88.0×36.0，可以用 ButtonTheme 覆盖。该clipBehavior参数不能为空;""";

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

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

class _DemoState extends State<Demo> {
  @override
  Widget build(BuildContext context) {
    return WidgetDemo(
      title: 'FlatButton',
      codeUrl: 'elements/Form/Button/FlatButton/demo.dart',
      contentList: [allFlatButtons(context)],
      docUrl: 'https://docs.flutter.io/flutter/material/FlatButton-class.html',
    );
  }
}

/*
 * 所有的 FlatButton 按钮
 */
Widget allFlatButtons(BuildContext context){
  return Container(
      //padding:  EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0, right: 0),
      child: Column(
          //mainAxisSize: MainAxisSize.max,
          children: <Widget>[
            MarkdownBody(data: _flatText0),
            textAlignBar(_flatText1),
            ButtonBar(
              alignment: MainAxisAlignment.spaceAround,
              mainAxisSize: MainAxisSize.max,
              children: <Widget>[
                flatButton.FlatButtonDefault(),
                SizedBox(width: 20.0), // 间距
                flatButton.FlatButtonDefault(false),
              ],
            ),
            textAlignBar(_flatText2),
            ButtonBar(
              alignment: MainAxisAlignment.spaceAround,
              //mainAxisSize: MainAxisSize.min,
              children: <Widget>[
                flatButton.FlatButtonIconDefault(),
                flatButton.FlatButtonIconDefault(false),
              ],
            ),
            ButtonBar(
              alignment: MainAxisAlignment.spaceAround,
              //mainAxisSize: MainAxisSize.min,
              children: <Widget>[
                flatButton.FlatButtonIconDefault(true, Icons.android),
                flatButton.FlatButtonIconDefault(true, Icons.announcement),
              ],
            ),
            textAlignBar(_flatText3),
            //flatButton.FlatButtonCustom(context,'主要按钮',Colors.blue),
            flatButton.FlatButtonCustom('主要按钮',Colors.blue),
            SizedBox(height: 10.0),
            flatButton.FlatButtonCustom('成功按钮',Colors.green),
            SizedBox(height: 10.0),
            flatButton.FlatButtonCustom('信息按钮',Colors.grey),
            SizedBox(height: 10.0),
            flatButton.FlatButtonCustom('警告按钮',Colors.orange),
            SizedBox(height: 10.0),
            flatButton.FlatButtonCustom('危险按钮',Colors.pink),
            SizedBox(height: 10.0),
            flatButton.FlatButtonCustom('点击我试试！', Colors.red,
                 Border.all(color: Colors.brown, width: 5.0, style: BorderStyle.solid),
                    () => _showMessage('点击了 FLAT BUTTON ', context)),
            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)
      ])
  );
}