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Massage the JS interop around didCreateEngineInitializer #38147

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merged 4 commits into from
Dec 9, 2022
Merged

Massage the JS interop around didCreateEngineInitializer #38147

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e26575e
Massage the JS interop around `didCreateEngineInitializer` to make it…
eyebrowsoffire Dec 9, 2022
e3452a2
Make the whole type hierarchy more explicit.
eyebrowsoffire Dec 9, 2022
229b71b
Address Joshua's comments.
eyebrowsoffire Dec 9, 2022
c878cae
Merge branch 'main' into engine_initializer_interop
eyebrowsoffire Dec 9, 2022
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10 changes: 3 additions & 7 deletions lib/web_ui/lib/initialization.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -79,19 +79,15 @@ Future<void> webOnlyWarmupEngine({
},
);

// Should the app "autoStart"?
bool autoStart = true;
if (engine.flutter != null && engine.loader != null) {
autoStart = engine.didCreateEngineInitializer == null;
}
if (autoStart) {
final engine.FlutterLoader? loader = engine.flutter?.loader;
if (loader == null || loader.isAutoStart) {
// The user does not want control of the app, bootstrap immediately.
engine.domWindow.console.debug('Flutter Web Bootstrap: Auto.');
await bootstrap.autoStart();
} else {
// Yield control of the bootstrap procedure to the user.
engine.domWindow.console.debug('Flutter Web Bootstrap: Programmatic.');
engine.didCreateEngineInitializer!(bootstrap.prepareEngineInitializer());
loader.didCreateEngineInitializer(bootstrap.prepareEngineInitializer());
}
}

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25 changes: 16 additions & 9 deletions lib/web_ui/lib/src/engine/js_interop/js_loader.dart
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Expand Up @@ -6,25 +6,32 @@
library js_loader;

import 'package:js/js.dart';
import 'package:js/js_util.dart' as js_util;

import '../configuration.dart';
import 'js_promise.dart';

/// Typedef for the function that notifies JS that the main entrypoint is up and running.
/// As a parameter, a [FlutterEngineInitializer] instance is passed to JS, so the
/// programmer can control the initialization sequence.
typedef DidCreateEngineInitializerFn = void Function(FlutterEngineInitializer);
@JS()
@staticInterop
class FlutterJS {}

extension FlutterJSExtension on FlutterJS {
external FlutterLoader? get loader;
}

// Both `flutter`, `loader`(_flutter.loader), must be checked for null before
// `didCreateEngineInitializer` can be safely accessed.
@JS('_flutter')
external Object? get flutter;
external FlutterJS? get flutter;

@JS('_flutter.loader')
external Object? get loader;
@JS()
@staticInterop
class FlutterLoader {}

@JS('_flutter.loader.didCreateEngineInitializer')
external DidCreateEngineInitializerFn? get didCreateEngineInitializer;
extension FlutterLoaderExtension on FlutterLoader {
external void didCreateEngineInitializer(FlutterEngineInitializer initializer);
bool get isAutoStart => !js_util.hasProperty(this, 'didCreateEngineInitializer');
}

// FlutterEngineInitializer

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