update

Author: AweiLoveAndroid

projects/flutter-demo/lib/mysample/view/BoxDecorationDemo.dart

@@ -0,0 +1,185 @@
+import 'package:flutter/material.dart';
+
+/// 盒子模型demo
+/// 这里主要是盒子模型的api用法
+void main() {
+  runApp(
+    new MaterialApp(
+      title: 'BoxDemo',
+      theme: new ThemeData(
+        primarySwatch: Colors.blue, //设置全局主题
+      ),
+      home: new BoxDemo(),
+    ),
+  );
+}
+
+class BoxDemo extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return new Scaffold(
+      appBar: new AppBar(
+        title: new Text('BoxDemo'),
+      ),
+      body: _buildBox2(),
+    );
+  }
+
+  //创建单个盒子，里面放一个text
+  Widget _buildBox() {
+    return new Container(
+      //宽
+      width: 320.0,
+      //高
+      height: 240.0,
+      //背景颜色
+//      color: Colors.grey[300],
+      margin: new EdgeInsets.all(50.0),
+      padding: new EdgeInsets.all(80.0),
+      alignment: Alignment.center,
+      constraints: new BoxConstraints.expand(width: 300.0, height: 200.0),
+      decoration: new BoxDecoration(
+        borderRadius: new BorderRadius.all(
+          //让矩形四个角都变成圆角
+          const Radius.circular(8.0),
+        ),
+        //垂直线性渐变
+        gradient: new LinearGradient(
+          begin: const Alignment(0.0, -1.0),
+          end: const Alignment(0.0, 0.6),
+          colors: <Color>[const Color(0xffef5350), const Color(0x00ef5350)],
+        ),
+        //阴影
+        boxShadow: <BoxShadow>[
+          new BoxShadow(
+            color: const Color(0xcc000000),
+            offset: new Offset(0.0, 2.0),
+            blurRadius: 4.0,
+          ),
+          new BoxShadow(
+            color: const Color(0x80000000),
+            offset: new Offset(0.0, 6.0),
+            blurRadius: 20.0,
+          ),
+        ],
+      ),
+      child: new Text(
+        "单个盒子",
+        style: _buildTextStyle(),
+      ),
+    );
+  }
+
+  // 旋转组件  在控件外层加一个Transform控件
+  Widget _buildBox2() {
+    return new Container(
+      child: new Center(
+        child: new Transform(
+          child: new Container(
+            child: new Text(
+              "旋转控件",
+              style: _buildTextStyle(),
+              textAlign: TextAlign.center,
+            ),
+            decoration: new BoxDecoration(
+              color: Colors.red[400],
+            ),
+            padding: new EdgeInsets.all(16.0),
+          ),
+          alignment: Alignment.center,
+          transform: _buildLocation(),
+        ),
+      ),
+      width: 320.0,
+      height: 240.0,
+      color: Colors.grey[300],
+    );
+  }
+
+  //盒子中间嵌套盒子
+  Widget _buildBoxInBox() {
+    // 外层盒子
+    return new Container(
+      child: new Center(
+        //内层盒子
+        child: new Container(
+          child: new Text(
+            "盒子中嵌套盒子",
+            style: _buildTextStyle(),
+          ),
+          decoration: new BoxDecoration(
+            color: Colors.deepOrange,
+          ),
+          padding: new EdgeInsets.all(16.0),
+          width: 240.0, //最大宽度是 240.0
+        ),
+      ),
+      width: 320.0,
+      height: 240.0,
+      color: Colors.blue[300],
+    );
+  }
+
+  // 设置一个圆形
+  Widget _buildRound() {
+    return new Container(
+      // red circle
+      child: new Text(
+        "Lorem ipsum",
+        style: _buildTextStyle(),
+        textAlign: TextAlign.center,
+      ),
+      decoration: new BoxDecoration(
+        color: Colors.red[400],
+        shape: BoxShape.circle,
+      ),
+      padding: new EdgeInsets.all(16.0),
+      width: 160.0,
+      height: 160.0,
+    );
+  }
+
+  //富文本的显示
+  Widget _buildRichText() {
+    return new RichText(
+      text: new TextSpan(
+        style: _buildTextStyle(),
+        children: <TextSpan>[
+          new TextSpan(text: "Lorem "),
+          new TextSpan(
+            text: "ipsum",
+            style: new TextStyle(
+              fontWeight: FontWeight.w300,
+              fontStyle: FontStyle.italic,
+              fontSize: 48.0,
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+
+  //文本样式
+  TextStyle _buildTextStyle() {
+    return new TextStyle(
+      //文本大小
+      fontSize: 24.0,
+      //字体粗细
+      fontWeight: FontWeight.w900,
+      //字体
+      fontFamily: "Georgia", //...还有其他属性就不一一列举了
+      //间距
+      letterSpacing: 4.0,
+    );
+  }
+
+  // 设置操作位置
+  Matrix4 _buildLocation() {
+    //旋转
+    // return new Matrix4.identity()..rotateZ(15 * 3.1415927 / 180);
+    // 缩放
+//    return new Matrix4.identity()..scale(1.5);
+    // 平移
+//    return new Matrix4.identity()..translate(10.0,10.0,0.0);
+  }
+}