add license

Author: fbchen

README.md

@@ -1,16 +1,147 @@
-# flutter_constraintlayout
+# Flutter ConstraintLayout
 
-constraintlayout for flutter
+Build flexible layouts with constraints, Similar to Android ConstraintLayout.
 
-## Getting Started
+# Example
 
-This project is a starting point for a Flutter application.
+```dart
+import 'package:flutter/material.dart';
+import 'package:flutter_constraintlayout/constrait_layout/constraint_layout.dart';
 
-A few resources to get you started if this is your first Flutter project:
+void main() {
+  runApp(MaterialApp(
+    home: Scaffold(
+      backgroundColor: Colors.black,
+      body: ConstraintLayout(
+        children: [
+          Constrained(
+            id: 'box1',
+            width: 200,
+            height: 200,
+            topToTop: CL.parent,
+            rightToRight: CL.parent,
+            child: Container(
+              color: Colors.redAccent,
+              alignment: Alignment.center,
+              child: const Text('box1'),
+            ),
+          ),
+          Constrained(
+            id: 'box2',
+            width: CL.matchConstraint,
+            height: CL.matchConstraint,
+            leftToLeft: 'box3',
+            rightToRight: 'box3',
+            topToBottom: 'box3',
+            bottomToBottom: CL.parent,
+            child: Container(
+              color: Colors.blue,
+              alignment: Alignment.center,
+              child: const Text('box2'),
+            ),
+          ),
+          Constrained(
+            id: 'box4',
+            width: 50,
+            height: 50,
+            rightToRight: CL.parent,
+            bottomToBottom: CL.parent,
+            child: Container(
+              color: Colors.redAccent,
+              alignment: Alignment.center,
+              child: const Text('box4'),
+            ),
+          ),
+          Constrained(
+            id: 'box7',
+            width: 120,
+            height: 120,
+            centerVertical: true,
+            verticalBias: 0.5,
+            leftToRight: 'box3',
+            rightToRight: CL.parent,
+            horizontalBias: 0.5,
+            child: Container(
+              color: Colors.lightGreen,
+              alignment: Alignment.center,
+              child: const Text('box7'),
+            ),
+          ),
+          Constrained(
+            id: 'box8',
+            width: CL.matchConstraint,
+            height: CL.matchConstraint,
+            topToTop: 'box1',
+            leftToLeft: CL.parent,
+            rightToLeft: 'box3',
+            bottomToBottom: CL.parent,
+            margin: const EdgeInsets.all(50),
+            child: Container(
+              color: Colors.lightGreen,
+              alignment: Alignment.center,
+              child: const Text('box8'),
+            ),
+          ),
+          Constrained(
+            id: 'box3',
+            width: CL.wrapContent,
+            height: CL.wrapContent,
+            rightToLeft: 'box1',
+            topToBottom: 'box1',
+            child: Container(
+              color: Colors.orange,
+              width: 200,
+              height: 300,
+              alignment: Alignment.center,
+              child: const Text('box3'),
+            ),
+          ),
+          Constrained(
+            width: 100,
+            height: 100,
+            center: true,
+            child: Container(
+              color: Colors.pink,
+              alignment: Alignment.center,
+              child: const Text('child[6]'),
+            ),
+          )
+        ],
+      ),
+    ),
+  ));
+} 
+```
 
-- [Lab: Write your first Flutter app](https://flutter.dev/docs/get-started/codelab)
-- [Cookbook: Useful Flutter samples](https://flutter.dev/docs/cookbook)
+![example.webp](https://github.com/hackware1993/flutter-constraintlayout/blob/master/effect.webp)
 
-For help getting started with Flutter, view our
-[online documentation](https://flutter.dev/docs), which offers tutorials,
-samples, guidance on mobile development, and a full API reference.
+# Support me
+
+If it helps you, consider sponsoring me a cup of milk tea
+![support.webp](https://github.com/hackware1993/flutter-constraintlayout/blob/master/support.webp)
+
+# License
+
+```
+MIT License
+
+Copyright (c) 2016 hackware1993
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+```