Flutter - Animate a widget to move from GridView to BottomBar upon tapping - flutter

Question

I am looking to animate an image widget to move from a grid view to the bottom bar as shown below but much simpler. Could anyone provide me any guidance as to how to achieve this? I am leaning towards a transform animation, but I have hit a wall trying to calculate the source and destination screen points. Any help is highly appreciated.

Answer 1

Try this package, add_cart_parabola:
import 'dart:ui';
import 'package:add_cart_parabola/add_cart_parabola.dart';
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
GlobalKey floatKey = GlobalKey();
GlobalKey rootKey = GlobalKey();
Offset floatOffset ;
#override
void initState() {
// TODO: implement initState
super.initState();
WidgetsBinding.instance.addPostFrameCallback((_){
RenderBox renderBox = floatKey.currentContext.findRenderObject();
floatOffset = renderBox.localToGlobal(Offset.zero);
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Container(
key: rootKey,
width: double.infinity,
height: double.infinity,
color: Colors.grey,
child: ListView(
children: List.generate(40, (index){
return generateItem(index);
}).toList(),
),
),
floatingActionButton: FloatingActionButton(
backgroundColor: Colors.yellow,
key: floatKey,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
Widget generateItem(int index){
Text text = Text("item $index",style: TextStyle(fontSize:
25),);
Offset temp;
return GestureDetector(
onPanDown: (details){
temp = new Offset(details.globalPosition.dx, details.globalPosition
.dy);
},
onTap: (){
Function callback ;
setState(() {
OverlayEntry entry = OverlayEntry(
builder: (ctx){
return ParabolaAnimateWidget(rootKey,temp,floatOffset,
Icon(Icons.cancel,color: Colors.greenAccent,),callback,);
}
);
callback = (status){
if(status == AnimationStatus.completed){
entry?.remove();
}
};
Overlay.of(rootKey.currentContext).insert(entry);
});
},
child: Container(
color: Colors.orange,
child: text,
),
);
}
}