On hove animate images.

main.dart

import 'package:flutter/material.dart';

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(scaffoldBackgroundColor: darkBlue),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}

class MyWidget extends StatelessWidget {  
  @override
  Widget build(BuildContext context) {
    return GridView.count(
      crossAxisCount: 3,      
      children: <Widget>[ImageHover(),ImageHover(),ImageHover(),ImageHover(),ImageHover(),ImageHover(),ImageHover(),],
    );
  }
}

class ImageHover extends StatefulWidget {
  @override
  _ImageHoverState createState() => _ImageHoverState();
}

class _ImageHoverState extends State<ImageHover> {
  double elevation = 4.0;
  double scale = 1.0;
  Offset translate = Offset(0,0);
  @override
  Widget build(context) {
    return InkWell(      
      onTap: (){},
      onHover: (value){
        print(value);
        if(value){
          setState((){
            elevation = 20.0;     
            scale = 2.0;
            translate = Offset(20,20);
          });
        }else{
          setState((){
            elevation = 4.0; 
            scale = 1.0;
            translate = Offset(0,0);
          });
        }
      },
      child: Transform.translate(
        offset: translate ,        
        child: Transform.scale(
          scale: scale,
          child: Material(        
            elevation: elevation,        
            child: Image.network(           
                'https://i.ytimg.com/vi/acm9dCI5_dc/maxresdefault.jpg',              
            ),
          ),
        ),
      ),
    );
  }
}