Add the ability to pass in required update title, message, prompt.

[markclemonsaya]

I would like the ability to customize the message based on an optional upgrade vs a required update.

Suggestion: update the Upgrader class to support a second UpgraderMessages param for forced updates.

class OptionalMessages extends UpgraderMessages;
class ForcedMessages extends UpgraderMessages;

Upgrader (
messages: OptionalMessages(),
forcedMessages: ForcedMessages(),
)

Update the determineMessages method to consider if the blocked method is true then return ForcedMessages.

[MoacirSchmidt]

You have to override "blocked" method

class AppUpgrader extends Upgrader {
  static final AppUpgrader _instance = AppUpgrader._internal();
  AppUpgrader._internal()
      : super(
          countryCode: 'BR',
          languageCode: 'pt',
          messages: AppUpgraderMessages(),
          durationUntilAlertAgain: const Duration(days: 1),
          debugDisplayAlways: true,
          debugLogging: true,
        );
  static AppUpgrader get instance => _instance;

  @override
  bool blocked() {
    return super.blocked() 
      || _isCriticalUpdate(AppUpgrader.instance.currentInstalledVersion, 
         AppUpgrader.instance.currentAppStoreVersion);
  }
}

and messages:

class AppUpgraderMessages extends UpgraderMessages {
  @override
  String get title => _isCriticalUpdate(
        AppUpgrader.instance.currentInstalledVersion,
        AppUpgrader.instance.currentAppStoreVersion,
      )
          ? 'Atualização Necessária'
          : 'Atualizar aplicativo?';
}

_isCriticalUpdate:

bool _isCriticalUpdate(String? currentInstalledVersion, String? currentAppStoreVersion) {
  Version installedVersion = Version.parse(currentInstalledVersion ?? '0.0.0');
  Version appStoreVersion = Version.parse(currentAppStoreVersion ?? '0.0.0');
  return (installedVersion.major != appStoreVersion.major || installedVersion.minor != appStoreVersion.minor);
}