INNER CODE UNIT · Dart

DeferredWidget

flutter-team-archive/gallery · lib/deferred_widget.dart:16

class DeferredWidget extends StatefulWidget {
  DeferredWidget(
    this.libraryLoader,
    this.createWidget, {
    super.key,
    Widget? placeholder,
  }) : placeholder = placeholder ?? Container();

  final LibraryLoader libraryLoader;
  final DeferredWidgetBuilder createWidget;
  final Widget placeholder;
  static final Map<LibraryLoader, Future<void>> _moduleLoaders = {};
  static final Set<LibraryLoader> _loadedModules = {};

  static Future<void> preload(LibraryLoader loader) {
    if (!_moduleLoaders.containsKey(loader)) {
      _moduleLoaders[loader] = loader().then((dynamic _) {
        _loadedModules.add(loader);

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