format code

lib/widgets/elements/Form/Button/FlatButton/index.dart

@@ -9,40 +9,11 @@
  */
 import '../../../../../common/widget-demo.dart';
 import '../../../../../routers/application.dart';
-import 'dart:math';
 import 'package:flutter/material.dart';
 
 import 'package:flutter_markdown/flutter_markdown.dart';
 import './demo.dart' as flatButton;
 
-const String _markdownData = """# Markdown Example
-Markdown allows you to easily include formatted text, images, and even formatted Dart code in your app.
-## Styling
-Style text as _italic_, __bold__, or `inline code`.
-- Use bulleted lists
-- To better clarify
-- Your points
-## Links
-You can use [hyperlinks](hyperlink) in markdown
-## Images
-You can include images:
-![Flutter logo](https://flutter.io/images/flutter-mark-square-100.png#100x100)
-## Markdown widget
-This is an example of how to create your own Markdown widget:
-    new Markdown(data: 'Hello _world_!');
-## Code blocks
-Formatted Dart code looks really pretty too:
-```
-void main() {
-  runApp(new MaterialApp(
-    home: new Scaffold(
-      body: new Markdown(data: markdownData)
-    )
-  ));
-}
-```
-Enjoy!
-""";
 
 
 const String _flatText0 =
@@ -90,7 +61,7 @@ class _DemoState extends State<Demo> {
   }
 }
 
-/**
+/*
  * 所有的 FlatButton 按钮
  */
 Widget allFlatButtons(BuildContext context){