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# 🛠️ Using Custom App Widget |
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The project uses some adaptive widgets like `AdaptiveTextSelectionToolbar` which require the following delegates: |
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1. Default Material Localizations delegate |
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2. Default Cupertino Localizations delegate |
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3. Default Widgets Localizations delegate |
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You don't need to include these since they are defined by default. However, if you are using a custom app or overriding the `localizationsDelegates` in the App widget, ensure it includes the following: |
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```dart |
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localizationsDelegates: const [ |
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DefaultCupertinoLocalizations.delegate, |
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DefaultMaterialLocalizations.delegate, |
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DefaultWidgetsLocalizations.delegate, |
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], |
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``` |
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You might need more depending on your use case. For example, if you are using custom localizations for your app with a custom app widget like `FluentApp` from [FluentUI], you will also need: |
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```dart |
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localizationsDelegates: const [ |
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// Required localizations delegates ... |
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FluentLocalizations.delegate, |
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AppLocalizations.delegate, |
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], |
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``` |
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📌 Note: In recent versions of `FluentApp`, you no longer need to add the `localizationsDelegates`. This is just an example. For more information, refer to the [#946](https://github.com/bdlukaa/fluent_ui/pull/946). |
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📄 For additional notes, see the [Localizations](./localizations_setup.md) page. |
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[FluentUI]: https://pub.dev/packages/fluent_ui
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