INNER CODE UNIT · Dart

BotToastWidgetsBindingObserver

MMMzq/bot_toast · lib/src/bot_toast_init.dart:13

class BotToastWidgetsBindingObserver with WidgetsBindingObserver {
  BotToastWidgetsBindingObserver._() : _listener = <PopTestFunc>[] {
    //Compatible with flutter 3.x
    (WidgetsBinding.instance as dynamic).addObserver(this);
  }

  final List<PopTestFunc> _listener;

  static final BotToastWidgetsBindingObserver _singleton =
      BotToastWidgetsBindingObserver._();

  static BotToastWidgetsBindingObserver get singleton => _singleton;

  VoidCallback registerPopListener(PopTestFunc popTestFunc) {
    _listener.add(popTestFunc);
    return () {
      _listener.remove(popTestFunc);
    };

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