How to add Progress Indicator on Cards while tap in Flutter? - flutter

Question

I am using Cards in Flutter and want Progress Indicator at the left bottom position for 2 seconds while Tap on the card so that another page load successfully.
Does anyone know how to add?
Container(
height: 130,
child: Card(
child: Row(
children: <Widget>[
Expanded(
child: ListTile(
title: Text(
'My card Location',
style: TextStyle(
fontSize: 15, fontWeight: FontWeight.w700),
),
leading: Icon(Icons.setting),
// color: Colors.blueAccent, size: mediumIconSize),
trailing: Icon(Icons.keyboard_arrow_right),
selected: true,
onTap: () async {
// I try this one but not working
// Flushbar(
//
// showProgressIndicator: true,
// duration: Duration(seconds: 2),
// );
getDetails().then((myCardlocations) {
Navigator
.of(context)
.pushNamed('/myCardlocations',
arguments: ObjectLocations(locations, 'myCardlocations'));
}
);
}
),
),
],
),
),
),

Answer 1

You can do something like this using Stack and CircularProgressIndicator..
class _MyWidgetState extends State<MyWidget> {
bool isLoading = false;
#override
Widget build(BuildContext context) {
return Container(
height: 130,
child: Stack(
children: [
Container(
height: 130,
child: Card(
child: Row(
children: <Widget>[
Expanded(
child: ListTile(
title: Text(
'My card Location',
style: TextStyle(
fontSize: 15, fontWeight: FontWeight.w700),
),
leading: Icon(Icons.settings),
// color: Colors.blueAccent, size: mediumIconSize),
trailing: Icon(Icons.keyboard_arrow_right),
selected: true,
onTap: () async {
setState(() {
isLoading = true;
});
getDetails().then((myCardLocations) {
setState(() {
isLoading = false;
});
// navigation code here
});
},
),
),
],
),
),
),
Align(
alignment: Alignment.bottomLeft,
child: isLoading
? Padding(
padding: EdgeInsets.fromLTRB(15,0,0,15),
child: SizedBox(
width: 20,
height: 20,
child: CircularProgressIndicator(),
),
)
: SizedBox(),
),
],
),
);
}
}
Edit:
Looks like I misunderstood the question a bit. Specifically, the place where to show the progress indicator. Anyways, if you get the idea, you can put the indicator at a different place as per your requirement.

Answer 2

There are certain things, which I would like to mention before I give the actual answer.
Read about Flutter.delayed constructor, very useful thing to make some thing wait for a while and do the operation by providing Duration. Whatever you want to do after that duration, it will implement in the callback function
Future.delayed(Duration(seconds: your_time, (){
//it will perform this operation after that much of seconds
}));
You can always show/hide a Widget using bool value, and make changes accordingly
Use a column and Add the LinearProgressIndicator at the end of the Widget. Show/hide it based up on the data
Also, use MediaQuery to give out the height. It is more efficient way of giving the dimensions according to all phone size. Like match-parent in Android Studio. Do the math accordingly, I have shown in the code also
Column(
children: [
Row(),
bool val ? LinearProgressIndicator() : Container() // Container() is nothing but an empty widget which shows nothing
]
)
Some heads up: I have not used getData, since it is not defined properly but you can call it the in function which I will show you in the code, that is pageTransit(). Follow the comments and you are good to go
class _MyHomePageState extends State<MyHomePage> {
// this takes care of the show/hide of your progress indicator
bool _showProgress = false;
// this takes care of the operation
void pageTransit(){
// first show when the ListTile is clicked
setState(() => _showProgress = true);
Future.delayed(Duration(seconds: 2), (){
// hide it after 2 seconds
setState(() => _showProgress = false);
// do the page trnasition here
//getDetails().then((myCardlocations) {
//Navigator.of(context).pushNamed('/myCardlocations',
//arguments: ObjectLocations(locations, 'myCardlocations'));
//}
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Container(
height: MediaQuery.of(context).size.height * 0.1,
child: Card(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
// use your items here, based upon the bool value show hide your
// progress indicator
Row(
children: <Widget>[
Expanded(
child: ListTile(
title: Text(
'My card Location',
style: TextStyle(
fontSize: 15, fontWeight: FontWeight.w700),
),
leading: Icon(Icons.settings),
// color: Colors.blueAccent, size: mediumIconSize),
trailing: Icon(Icons.keyboard_arrow_right),
selected: true,
onTap: () => pageTransit()
)
)
]
),
// show/hide in the card
_showProgress ? LinearProgressIndicator() : Container()
]
)
)
)
);
}
}
Result
Look at the ProgressIndicator, it remains there for 2 seconds, and then goes away

Answer 3

1. You need to define a GlobalKey for the Scaffold so that you can use a SnackBar (you can define the GloablKey in your page's State).
final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();
2. You need to set the key for the Scaffold.
#override
Widget build(BuildContext context) {
return Scaffold(
key: _scaffoldKey,
...
3. You need to wrap the Card with a GestureDetector and set the onTap function to call showLoading which shows a SnackBar on the bottom of the screen. Call your getDetails function in the showLoading. Full code (except the define key step):
void _showLoading() {
_scaffoldKey.currentState.showSnackBar(new SnackBar(
duration: new Duration(seconds: 2),
content: new Row(
children: <Widget>[
new CircularProgressIndicator(),
new Text("Loading...")
],
),
));
// call to your getDetails and its steps should be here
}
#override
Widget build(BuildContext context) {
return Scaffold(
key: _scaffoldKey,
appBar: AppBar(
title: Text("My app"),
),
body: Center(
child: GestureDetector(
child: Card(
child: Row(children: <Widget>[
Expanded(
child: ListTile(
title: Text(
'My card Location',
style: TextStyle(fontSize: 15, fontWeight: FontWeight.w700),
),
leading: Icon(Icons.settings),
// color: Colors.blueAccent, size: mediumIconSize),
trailing: Icon(Icons.keyboard_arrow_right),
selected: true,
)),
])),
onTap: () => _showLoading(),
)),
);
}
}
Note: you can also style the SnackBar.
Result: