How to create an animated container that hide/show widget in flutter - flutter

Question

I wanted to create a Container which looks like a Card with a small icon, when this icon is clicked the container height changed and show different component inside.
here is the expected result

Answer 1

Here is the working example,
double _height = 50.0;
bool _isExpanded = false;
Future<bool> _showList() async {
await Future.delayed(Duration(milliseconds: 300));
return true;
}
AnimatedContainer
AnimatedContainer(
duration: Duration(milliseconds: 300),
height: _height,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(5),
color: Colors.grey,
),
width: MediaQuery.of(context).size.width - 100,
padding: EdgeInsets.only(left: 15, right: 15),
child: Column(
children: [
Padding(
padding: const EdgeInsets.only(top: 10),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Text('Title'),
InkWell(
onTap: () {
if (!_isExpanded) {
setState(() {
_height = 300;
_isExpanded = true;
});
} else {
setState(() {
_height = 50;
_isExpanded = false;
});
}
},
child: Container(
height: 30,
width: 40,
color: Colors.red,
child: !_isExpanded ? Icon(Icons.add) : Icon(Icons.remove),
),
),
],
),
),
_isExpanded
? FutureBuilder(
future: _showList(), /// will wait untill box animation completed
builder: (context, snapshot) {
if (!snapshot.hasData) {
return SizedBox();
}
return ListView.builder(
itemCount: 10,
shrinkWrap: true,
itemBuilder: (context, index) {
return Text('data'); // your custom UI
},
);
})
: SizedBox.shrink(),
],
),
);