How can use AnimatedSize child of AnimatedPositioned in flutter?

Question

I want to use AnimatedSize, in child of AnimatedPositioned but i get the exception.

this is my code :

AnimatedPositioned( duration: Duration(seconds: 2), curve: Curves.fastLinearToSlowEaseIn, top: isProfileSelected ? 100 : 0, child: Transform.translate( offset: Offset(isProfileSelected ? MediaQuery.of(context).size.width / 2 - 53 :MediaQuery.of(context).size.width / 2 - 38, 90 / 2), child: AnimatedSize( curve: Curves.fastOutSlowIn, child: isProfileSelected ? SizedBox( width: 106.0, child: circleAvatar(106, 106), ) : SizedBox( width: 76.0, child: circleAvatar(76, 76), ), ), ), ),

This exception (The following assertion was thrown building Positioned(top: 100.0): 'package:flutter/src/rendering/animated_size.dart': Failed assertion: line 86 pos 15: 'vsync != null': is not true.) — Mohammad Mirshahbazi
– Mohammad Mirshahbazi, Commented Nov 23, 2020 at 7:30

Taha Malik · Accepted Answer · 2020-11-23 08:47:46Z

add this to your class state

class _MyWidgetState extends State<_MyWidget> with SingleTickerProviderStateMixin { ............. AnimatedPositioned( duration: Duration(seconds: 2), curve: Curves.fastLinearToSlowEaseIn, top: isProfileSelected ? 100 : 0, child: Transform.translate( offset: Offset(isProfileSelected ? MediaQuery.of(context).size.width / 2 - 53 :MediaQuery.of(context).size.width / 2 - 38, 90 / 2), child: AnimatedSize( vsync: this, //This must be required duration: Duration(milliseconds: 200), //Duration is also required curve: Curves.fastOutSlowIn, child: isProfileSelected ? SizedBox( width: 106.0, child: circleAvatar(106, 106), ) : SizedBox( width: 76.0, child: circleAvatar(76, 76), ), ), ), ), ......................

}

The named parameter 'vsync' isn't defined. This is wrong. Or maybe too old, but vsync is not a property of AnimatedSize nor it is part of AnimatedPositioned.

Collectives™ on Stack Overflow

How can use AnimatedSize child of AnimatedPositioned in flutter?

1 Answer 1

1 Comment

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Related