点击容器触发onTap()处理程序，但不会显示任何墨水飞溅效果。
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text(widget.title),
),
body: new Center(
child: new InkWell(
onTap: (){print("tapped");},
child: new Container(
width: 100.0,
height: 100.0,
color: Colors.orange,
),
),
),
);
}
}
我试着把InkWell放在容器里，但徒劳。
InkWell小部件必须有一个材质小部件作为祖先，否则它不能显示效果。例如:
材料(
孩子:InkWell(
孩子:.....
你必须添加onTap方法来查看实际效果
按钮{RaisedButton,FlatButton等}。
例如->材料(
孩子:InkWell(
onTap:(){}
孩子:.....
让我们来看看要点，看看下面的例子，试着理解
InkWell的实际概念。
In Below example Material is parent of InkWell with onTap but it still not working. Please try to understand the concept of it. You should provide some margin to container or other widget to show the effects. Actually below code working fine but we can't see because we did not provide any margin or align so it has no space to show the effects.
Widget build(BuildContext context) {
return Center(
child: Material(
child: new InkWell(
onTap: () {
print("tapped");
},
child: new Container(
width: 100.0,
height: 100.0,
color: Colors.orange,
),
),
),
);
}
Below example show InkWell effects only to upwards because we provide space {margin}.
Widget build(BuildContext context) {
return Center(
child: Material(
child: new InkWell(
onTap: () {
print("tapped");
},
child: new Container(
margin: EdgeInsets.only(top: 100.0),
width: 100.0,
height: 100.0,
color: Colors.orange,
),
),
),
);
}
Below exp. show the effects in all the page because center create margin from all the side. Centre align it's child widget from top, left, right and bottom.
Widget build(BuildContext context) {
return Center(
child: Material(
child: new InkWell(
onTap: () {
print("tapped");
},
child: Center(
child: new Container(
width: 100.0,
height: 100.0,
color: Colors.orange,
),
),
),
),
);
}
现在使用MaterialButton，在更新的版本颤振
Widget build(BuildContext context) {
return Padding(
padding: const EdgeInsets.symmetric(horizontal: 16.0),
child: MaterialButton(
child: Text(
labelText,
style: TextStyle(fontSize: 22),
),
onPressed: () {},
color: backgroundColor,
height: 45,
minWidth: double.infinity,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.all(
Radius.circular(16),
),
),
),
);
}
child: Material(
color: Colors.transparent
child: InkWell(
onTap: (){ print("this Ripple!";},
splashColor: Colors.greenAccent,
child: Container(
height:100.0,
color: Colors.white,
),
),
),
在InkWell之前添加材质，并将颜色设置为Colors.transparent。
