modal_progress_hud_nsn

pub package

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

A fork of the original modal_progress_hud by mmcc007 with Null Safety and additional features.

Usage

Add the modal_progress_hud_nsn to dependencies in pubspec.yaml.

dependencies:
    modal_progress_hud_nsn: ^0.5.0

Next, import the library into your app.

import 'package:modal_progress_hud_nsn/modal_progress_hud_nsn.dart';

Now, wrap your widget as a child of ModalProgressHUD, typically a form, together with a boolean variable that is maintained in local state.

...
bool _saving = false
...

@override
Widget build(BuildContext context) {
  return Scaffold(
     body: ModalProgressHUD(child: Container(
       Form(...)
     ), inAsyncCall: _saving),
  );
}

Options

Below parameters can be customised accordingly.

ModalProgressHUD(
  @required inAsyncCall: bool,
  @required child: Widget,
  opacity: double,
  color: Color,
  progressIndicator: CircularProgressIndicator,
  offset: double
  dismissible: bool,
  blur: double,
);

Example

An example app that demonstrates the usage.

  1. On initial load, _saving defaults to false which causes your child widget to display.
  2. When the form is submitted, _saving is set to true, which will display the modal.
  3. Once the async call is complete, _saving is set back to false, hiding the modal.
Example Code 
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),
    );
  }
}

Similar Alternatives

Useful Resources

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!

Libraries