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| class GMExampleAlignTransitionTest extends StatefulWidget {
GMExampleAlignTransitionTest({Key key}) : super(key: key);
@override
_GMExampleAlignTransitionTestState createState() =>
_GMExampleAlignTransitionTestState();
}
class _GMExampleAlignTransitionTestState
extends State<GMExampleAlignTransitionTest>
with SingleTickerProviderStateMixin {
AnimationController _animationController;
Animation<AlignmentGeometry> _animation;
@override
void initState() {
this._animationController =
AnimationController(duration: Duration(seconds: 2), vsync: this);
this._animation = Tween<AlignmentGeometry>(
begin: Alignment.topLeft, end: Alignment.bottomRight)
.animate(this._animationController);
//开始动画
this._animationController.forward();
super.initState();
}
@override
void dispose() {
this._animationController.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Container(
height: 200,
width: 200,
color: Colors.blue,
child: AlignTransition(
alignment: _animation,
child: Container(
height: 30,
width: 30,
color: Colors.red,
),
),
);
}
}
|
