List changed listeners - dart

Question

i have a listview builder in flutter which is used to load a images when i remove a item i want to set listener for my listview that data has changed.
this is complete code this class is used for create a image style.
How can i solve hwn i click iconbutton i want to remove a item from list,
onw this is its removing when i press another button or something else
class Users extends StatefulWidget
{
final List image;
final File imageURL;
const Users ({Key key, this.imageURL,this.image}) : super(key: key);
#override
UserWidgets createState() => UserWidgets();
}
class UserWidgets extends State<Users>
{
#override
Widget build(BuildContext context)
{
VideoPlayerController playerController;
VoidCallback listener;
Widget play=new Icon(Icons.play_arrow);
Widget pause=new Icon(Icons.pause);
return new Container(
height: 200.0,
child: Stack(
children: <Widget>[
widget.imageURL.toString().contains(".jpg") ||widget.imageURL.toString().contains(".png") ||
widget.imageURL.toString().contains(".jpeg") ?
new Container(
child: new Card(
child: new Column(
children: <Widget>[
new GestureDetector(
onTap: ()
{
Navigator.push(context, MaterialPageRoute(builder: (context) => VideoApp(file: widget.imageURL,)
),
);
},
child:
new Image.file(widget.imageURL
,fit: BoxFit.cover,
height: 200.0,
width: 150.0,
),
)
],
)
),
): widget.imageURL.toString().contains(".mp4") ||widget.imageURL.toString().contains(".3gp") ?
new Container(
height: 100.0,
child: AspectRatio(aspectRatio: 10/6,
child: GestureDetector(
onTap: ()
{
Navigator.push(context, MaterialPageRoute(builder: (context) => VideoApp(file: widget.imageURL,)
),
);
},
child:
VideoPlayer(playerController = VideoPlayerController.file (widget.imageURL)
..addListener(listener)
..setVolume(1.0)
..initialize()
,
)
)
)
): new
Container(),
new Positioned(
child:
IconButton(icon: Icon(Icons.remove_circle),
color: Colors.black,
onPressed : ()
{
setState(() {
widget.image.remove(widget.imageURL);
print("helo");
});
}
)
,
top: 0.0,
right: 0.0,
)
],
),
);
}
}
now i need to know that what is equivalent to notifdatasetchanged().