Add:创建 flutter go web 版

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

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+/// Created with Android Studio.
+/// User: 一晟
+/// Date: 2018/11/22
+/// Time: 上午12:03
+/// email: zhu.yan@alibaba-inc.com
+/// target: FlatButton 的示例
+
+import 'dart:math';
+
+import 'package:flutter_web/material.dart';
+
+// FlatButton 默认按钮的实例
+// isDisabled:是否是禁用，isDisabled 默认为true
+class FlatButtonDefault extends StatelessWidget {
+  final bool isDisabled;
+
+  const FlatButtonDefault([ this.isDisabled = true])
+      : assert(isDisabled != null),
+        super();
+
+  @override
+  Widget build(BuildContext context) {
+    return FlatButton(
+      // 文本内容
+        child: const Text('默认按钮', semanticsLabel: 'FLAT BUTTON 1'),
+        onPressed: isDisabled ? () {} : null);
+  }
+}
+
+
+// FlatButton.icon 默认按钮的实例
+//  Create a text button from a pair of widgets that serve as the button's icon and label
+//  isDisabled:是否是禁用
+class FlatButtonIconDefault extends StatelessWidget {
+  final bool isDisabled;
+  final IconData icon;
+
+  const FlatButtonIconDefault(
+      [ this.isDisabled = true,  this.icon = Icons.add_circle])
+      : super();
+
+  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);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return FlatButton.icon(
+      // 文本内容
+        icon: Icon(icon, size: 25.0, color: _randomColor()),
+        label: Text('默认按钮', semanticsLabel: 'FLAT BUTTON 2'),
+        onPressed: isDisabled
+            ? () {
+          //_showMessage('点击了 FLAT BUTTON ', context);
+        }
+            : null);
+  }
+}
+
+
+// FlatButton 自定义的实例
+
+class FlatButtonCustom extends StatelessWidget {
+  final String txt;
+  final Color color;
+  final ShapeBorder shape;
+  final VoidCallback onPressed;
+
+  const FlatButtonCustom([
+     this.txt = '自定义按钮',
+     this.color = Colors.blueAccent,
+     this.shape,
+     this.onPressed
+  ]) :super();
+
+  @override
+  Widget build(BuildContext context) {
+    final _onPressed = onPressed;
+    return FlatButton(
+      // 文本内容
+        child: Text(txt, semanticsLabel: 'FLAT BUTTON 2'),
+        // 按钮颜色
+        color: color,
+        // 按钮亮度
+        colorBrightness: Brightness.dark,
+        // 高亮时的背景色
+        //highlightColor: Colors.yellow,
+        // 失效时的背景色
+        disabledColor: Colors.grey,
+        // 该按钮上的文字颜色，但是前提是不设置字体自身的颜色时才会起作用
+        textColor: Colors.white,
+        // 按钮失效时的文字颜色，同样的不能使用文本自己的样式或者颜色时才会起作用
+        disabledTextColor: Colors.grey,
+        // 按钮主题,主要用于与ButtonTheme和ButtonThemeData一起使用来定义按钮的基色,RaisedButton，FlatButton，OutlineButton，它们是基于环境ButtonTheme配置的
+        //ButtonTextTheme.accent，使用模版颜色的;ButtonTextTheme.normal，按钮文本是黑色或白色取决于。ThemeData.brightness;ButtonTextTheme.primary，按钮文本基于。ThemeData.primaryColor.
+        textTheme: ButtonTextTheme.normal,
+        // 按钮内部,墨汁飞溅的颜色,点击按钮时的渐变背景色，当你不设置高亮背景时才会看的更清楚
+        splashColor: Colors.deepPurple,
+        // 抗锯齿能力,抗锯齿等级依次递增,none（默认),hardEdge,antiAliasWithSaveLayer,antiAlias
+        clipBehavior: Clip.antiAlias,
+        padding:  EdgeInsets.only(
+            bottom: 5.0, top: 5.0, left: 30.0, right: 30.0),
+        shape: (shape is ShapeBorder) ? shape :  Border.all(
+          // 设置边框样式
+          color: Colors.grey,
+          width: 2.0,
+          style: BorderStyle.solid,
+        ),
+        // FlatButton 的点击事件
+        onPressed: () {
+          // Perform some action
+          if (_onPressed is VoidCallback) {
+            _onPressed();
+          }
+        },
+        // 改变高亮颜色回掉函数，一个按钮会触发两次，按下后改变时触发一次，松手后恢复原始颜色触发一次
+        // 参数 bool，按下后true，恢复false
+        onHighlightChanged: (isClick) {
+          print(isClick);
+        }
+    );
+  }
+}