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Description:

modal progress hud

modal_progress_hud #
A simple widget wrapper to enable modal progress HUD (a modal progress indicator, HUD = Heads Up Display)

Inspired by this article.
Demo #

See example for details
Usage #
Add the package to your pubspec.yml file.
dependencies:
modal_progress_hud: ^0.1.3
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Next, import the library into your widget.
import 'package:modal_progress_hud/modal_progress_hud.dart';
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Now, all you have to do is simply wrap your widget as a child of ModalProgressHUD, typically a form, together with a boolean that is maintained in local state.
...
bool _saving = false
...

@override
Widget build(BuildContext context) {
return Scaffold(
body: ModalProgressHUD(child: Container(
Form(...)
), inAsyncCall: _saving),
);
}
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Options #
The current parameters are customizable in the constructor
ModalProgressHUD(
@required inAsyncCall: bool,
@required child: Widget,
opacity: double,
color: Color,
progressIndicator: CircularProgressIndicator,
offset: double
dismissible: bool,
);
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Example #
Here is an example app that demonstrates the usage.

On initial load, _saving is false which causes your child widget to display
When the form is submitted, _saving is set to true, which will display the modal
Once the async call is complete, _saving is set back to false, hiding the modal

class SettingsPage extends StatefulWidget {
@override
_SettingsPageState createState() => new _SettingsPageState();
}

class _SettingsPageState extends State<SettingsPage> {
bool _saving = false;

void _submit() {

setState(() {
_saving = true;
});

//Simulate a service call
print('submitting to backend...');
new Future.delayed(new Duration(seconds: 4), () {
setState(() {
_saving = false;
});
});
}

Widget _buildWidget() {
return new Form(
child: new Column(
children: [
new SwitchListTile(
title: const Text('Bedroom'),
value: _bedroom,
onChanged: (bool value) {
setState(() {
_bedroom = value;
});
},
secondary: const Icon(Icons.hotel),
),
new RaisedButton(
onPressed: _submit,
child: new Text('Save'),
),
],
),
);
}

@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Flutter Progress Indicator Demo'),
backgroundColor: Colors.blue,
),
body: ModalProgressHUD(child: _buildWidget(), inAsyncCall: _saving),
);
}
}

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Update: See this article on Medium about async form validation
See the example application source
for a complete sample app using the modal progress HUD. Included in the
example is a method for using a form's validators while making async
calls (see flutter/issues/9688 for details).
Issues and feedback #
Please file issues
to send feedback or report a bug. Thank you!