Add auto assist for the map literal creation for routes

[zoechi]

@branflake2267 commented on Wed Apr 04 2018

I'd like to suggest adding auto assist completion for the map literal with types for the Scaffold routes argument. Something like the children literal array is created for ListView could be useful.

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new MyHomePage(),
      // ~~~ auto assist could create this...
      routes: <String, WidgetBuilder>{
         // insert caret
      },
    );
  }
}

Steps to Reproduce

1. add the routes: property for scaffold
2. key in control + space to try to auto assist completion

Logs

Nothing useful.

Flutter Doctor

brandons-mbp:flutter_preferences branflake2267$ flutter doctor -v
[✓] Flutter (Channel master, v0.2.9-pre.17, on Mac OS X 10.13.3 17D102, locale en-US)
    • Flutter version 0.2.9-pre.17 at /Users/branflake2267/git/flutter
    • Framework revision 7a6a65a597 (12 minutes ago), 2018-04-03 19:31:08 -0700
    • Engine revision 04f3c6557c
    • Dart version 2.0.0-dev.43.0.flutter-52afcba357

[!] Android toolchain - develop for Android devices (Android SDK 27.0.3)
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    • Platform android-27, build-tools 27.0.3
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    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)
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    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)

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! Doctor found issues in 2 categories.

---

@zoechi commented on Fri Jul 06 2018

@devoncarew do you think this can be done.
Should this issue be moved to dart-lang/sdk to get the attention of the analyzer team?

[pq]

/cc @scheglov

[scheglov]

@branflake2267, I need your help to understand your feature request.

Do you prefer such code style, when list and map literals have explicit type annotations?
Or is there a lint that you enabled and that asks you to write these type annotations?

Because otherwise, if you don't need <String, WidgetBuilder>, there is very little for code completion to help you with. All you need is to type {} and start filling inside {}. I'm pretty sure that this would be faster than waiting for code completion.

[branflake2267]

I figured it'd be nice to declare the generic types when and if auto-generating the snippet of code to fill in. That's because I like an explicit story when I read the code. But not everybody likes it verbose like that. I suspect you're right the brackets are the only thing needed, seems like that's the trend to have less noise...