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<>InkWell
InkWell组件在用户点击时出现“水波纹”效果，InkWell简单用法：
InkWell( onTap: (){}, child: Text('这是InkWell点击效果'), )
onTap是点击事件回调，如果不设置无法出现“水波纹”效果，效果如下：
设置水波纹颜色：
InkWell( onTap: () {}, splashColor: Colors.red, ... )
效果如下：
设置高亮颜色颜色：
InkWell( onTap: () {}, highlightColor: Colors.blue, ... )
高亮颜色是按住时显示的颜色，效果如下：
给字体添加边距和圆角边框，扩大“水波纹”效果：
InkWell( onTap: (){}, child: Container( padding: EdgeInsets.symmetric(
horizontal: 20,vertical: 8), decoration: BoxDecoration( border:Border.all(color:
Colors.blue), borderRadius: BorderRadius.all(Radius.circular(30)) ), child:
Text('这是InkWell点击效果'), ), )
效果如下：
发现“水波纹”超出的了圆角边框，如何解决这个问题呢？Ink隆重登场。
<>Ink
Ink控件用于在[Material]控件上绘制图像和其他装饰，以便[InkWell]、[InkResponse]控件的“水波纹”效果在其上面显示。
上面的问题修改代码如下：
Ink( decoration: BoxDecoration( gradient: LinearGradient( begin: Alignment.
topLeft, end: Alignment.bottomRight, colors: [Color(0xFFDE2F21), Color(
0xFFEC592F)]), borderRadius: BorderRadius.all(Radius.circular(20))), child:
InkWell( borderRadius: BorderRadius.all(Radius.circular(20)), child: Container(
padding: EdgeInsets.symmetric(vertical: 8, horizontal: 20), child: Text(
'这是InkWell的点击效果', style: TextStyle(color: Colors.white), ), ), onTap: () {}, ),
)
效果如下：
