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id="banner-container"></div><main class="container"><div class="detail-wrapper -active -has-info-box"><div class="detail-header -is-loose"><div class="detail-container"><div class="detail-header-outer-block"><div class="detail-header-content-block"><h1 class="title pub-monochrome-icon-hoverable">replay_bloc 0.3.0 <span class="pkg-page-title-copy"><img class="pub-monochrome-icon pkg-page-title-copy-icon filter-invert-on-dark" src="/static/hash-mh7qv2oc/img/content-copy-icon.svg" alt="copy "replay_bloc: ^0.3.0" to clipboard" width="18" height="18" title="Copy "replay_bloc: ^0.3.0" to clipboard" data-copy-content="replay_bloc: ^0.3.0" data-ga-click-event="copy-package-version"/><div class="pkg-page-title-copy-feedback"><span class="code">replay_bloc: ^0.3.0</span> copied to clipboard</div></span></h1><div class="metadata">Published <span><a class="-x-ago" href="" title="Jan 12, 2025" role="button" data-timestamp="1736718627559">2 months ago</a></span> • <a class="-pub-publisher" 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class="detail-tab tab-link detail-tab-example-title"><a href="/packages/replay_bloc/example" role="button">Example</a></li><li class="detail-tab tab-link detail-tab-installing-title"><a href="/packages/replay_bloc/install" role="button">Installing</a></li><li class="detail-tab tab-link detail-tab-versions-title"><a href="/packages/replay_bloc/versions" role="button">Versions</a></li><li class="detail-tab tab-link detail-tab-analysis-title"><a href="/packages/replay_bloc/score" role="button">Scores</a></li></ul></div></div><div class="detail-container detail-body-main"><div class="detail-tabs-content"><section class="tab-content detail-tab-readme-content -active markdown-body"><p align="center"><img src="https://raw.githubusercontent.com/felangel/bloc/master/assets/logos/replay_bloc.png" height="100" alt="ReplayBloc"></p> <p align="center"> <a href="https://pub.dev/packages/replay_bloc"><img src="https://img.shields.io/pub/v/replay_bloc.svg" alt="Pub"></a> <a href="https://github.com/felangel/bloc/actions" rel="ugc"><img src="https://github.com/felangel/bloc/workflows/build/badge.svg" alt="build"></a> <a href="https://codecov.io/gh/felangel/bloc" rel="ugc"><img src="https://codecov.io/gh/felangel/Bloc/branch/master/graph/badge.svg" alt="codecov"></a> <a href="https://github.com/felangel/bloc" rel="ugc"><img src="https://img.shields.io/github/stars/felangel/bloc.svg?style=flat&logo=github&colorB=deeppink&label=stars" alt="Star on Github"></a> <a href="https://flutter.dev/docs/development/data-and-backend/state-mgmt/options#bloc--rx"><img src="https://img.shields.io/badge/flutter-website-deepskyblue.svg" alt="Flutter Website"></a> <a href="https://github.com/Solido/awesome-flutter#standard" rel="ugc"><img src="https://img.shields.io/badge/awesome-flutter-blue.svg?longCache=true" alt="Awesome Flutter"></a> <a href="https://fluttersamples.com" rel="ugc"><img src="https://img.shields.io/badge/flutter-samples-teal.svg?longCache=true" alt="Flutter Samples"></a> <a href="https://opensource.org/licenses/MIT" rel="ugc"><img src="https://img.shields.io/badge/license-MIT-purple.svg" alt="License: MIT"></a> <a href="https://discord.gg/bloc" rel="ugc"><img src="https://img.shields.io/discord/649708778631200778.svg?logo=discord&color=blue" alt="Discord"></a> <a href="https://github.com/felangel/bloc" rel="ugc"><img src="https://tinyurl.com/bloc-library" alt="Bloc Library"></a> </p> <p>An extension to <a href="https://github.com/felangel/bloc" rel="ugc">package:bloc</a> which adds automatic undo and redo support to bloc and cubit states. Built to work with <a href="https://pub.dev/packages/bloc">package:bloc</a>.</p> <p><strong>Learn more at <a href="https://bloclibrary.dev" rel="ugc">bloclibrary.dev</a>!</strong></p> <hr> <h2 id="sponsors" class="hash-header">Sponsors <a href="#sponsors" class="hash-link">#</a></h2> <p>Our top sponsors are shown below! [<a href="https://github.com/sponsors/felangel" rel="ugc">Become a Sponsor</a>]</p> <table> <tbody> <tr> <td align="center"> <a href="https://shorebird.dev" rel="ugc"><img src="https://raw.githubusercontent.com/felangel/bloc/master/assets/sponsors/shorebird.png" width="225"></a> </td> <td align="center"> <a href="https://www.monterail.com/services/flutter-development/?utm_source=bloc&utm_medium=logo&utm_campaign=flutter" rel="ugc"><img src="https://raw.githubusercontent.com/felangel/bloc/master/assets/sponsors/monterail.png" width="225"></a> </td> <td align="center"> <a href="https://getstream.io/chat/flutter/tutorial/?utm_source=Github&utm_medium=Github_Repo_Content_Ad&utm_content=Developer&utm_campaign=Github_Jan2022_FlutterChat&utm_term=bloc" rel="ugc"><img src="https://raw.githubusercontent.com/felangel/bloc/master/assets/sponsors/stream.png" width="225"></a> </td> </tr> <tr> <td align="center"> <a href="https://www.miquido.com/flutter-development-company/?utm_source=github&utm_medium=sponsorship&utm_campaign=bloc-silver-tier&utm_term=flutter-development-company&utm_content=miquido-logo" rel="ugc"><img src="https://raw.githubusercontent.com/felangel/bloc/master/assets/sponsors/miquido.png" width="225"></a> </td> <td align="center"> <a href="https://www.netguru.com/services/flutter-app-development?utm_campaign=%5BS%5D%5BMob%5D%20Flutter&utm_source=github&utm_medium=sponsorship&utm_term=bloclibrary" rel="ugc"><img src="https://raw.githubusercontent.com/felangel/bloc/master/assets/sponsors/netguru.png" width="225"></a> </td> </tr> </tbody> </table> <hr> <h2 id="creating-a-replaycubit" class="hash-header">Creating a ReplayCubit <a href="#creating-a-replaycubit" class="hash-link">#</a></h2> <pre><code class="language-dart">class CounterCubit extends ReplayCubit<int> { CounterCubit() : super(0); void increment() => emit(state + 1); } </code></pre> <h2 id="using-a-replaycubit" class="hash-header">Using a ReplayCubit <a href="#using-a-replaycubit" class="hash-link">#</a></h2> <pre><code class="language-dart">void main() { final cubit = CounterCubit(); // trigger a state change cubit.increment(); print(cubit.state); // 1 // undo the change cubit.undo(); print(cubit.state); // 0 // redo the change cubit.redo(); print(cubit.state); // 1 } </code></pre> <h2 id="replaycubitmixin" class="hash-header">ReplayCubitMixin <a href="#replaycubitmixin" class="hash-link">#</a></h2> <p>If you wish to be able to use a <code>ReplayCubit</code> in conjuction with a different type of cubit like <code>HydratedCubit</code>, you can use the <code>ReplayCubitMixin</code>.</p> <pre><code class="language-dart">class CounterCubit extends HydratedCubit<int> with ReplayCubitMixin { CounterCubit() : super(0); void increment() => emit(state + 1); void decrement() => emit(state - 1); @override int fromJson(Map<String, dynamic> json) => json['value'] as int; @override Map<String, int> toJson(int state) => {'value': state}; } </code></pre> <h2 id="creating-a-replaybloc" class="hash-header">Creating a ReplayBloc <a href="#creating-a-replaybloc" class="hash-link">#</a></h2> <pre><code class="language-dart">class CounterEvent extends ReplayEvent {} class CounterIncrementPressed extends CounterEvent {} class CounterDecrementPressed extends CounterEvent {} class CounterBloc extends ReplayBloc<CounterEvent, int> { CounterBloc() : super(0) { on<CounterIncrementPressed>((event, emit) => emit(state + 1)); on<CounterDecrementPressed>((event, emit) => emit(state - 1)); } } </code></pre> <h2 id="using-a-replaybloc" class="hash-header">Using a ReplayBloc <a href="#using-a-replaybloc" class="hash-link">#</a></h2> <pre><code class="language-dart">void main() { // trigger a state change final bloc = CounterBloc()..add(CounterIncrementPressed()); // wait for state to update await bloc.stream.first; print(bloc.state); // 1 // undo the change bloc.undo(); print(bloc.state); // 0 // redo the change bloc.redo(); print(bloc.state); // 1 } </code></pre> <h2 id="replayblocmixin" class="hash-header">ReplayBlocMixin <a href="#replayblocmixin" class="hash-link">#</a></h2> <p>If you wish to be able to use a <code>ReplayBloc</code> in conjuction with a different type of cubit like <code>HydratedBloc</code>, you can use the <code>ReplayBlocMixin</code>.</p> <pre><code class="language-dart">sealed class CounterEvent with ReplayEvent {} final class CounterIncrementPressed extends CounterEvent {} final class CounterDecrementPressed extends CounterEvent {} class CounterBloc extends HydratedBloc<CounterEvent, int> with ReplayBlocMixin { CounterBloc() : super(0) { on<CounterIncrementPressed>((event, emit) => emit(state + 1)); on<CounterDecrementPressed>((event, emit) => emit(state - 1)); } @override int fromJson(Map<String, dynamic> json) => json['value'] as int; @override Map<String, int> toJson(int state) => {'value': state}; } </code></pre> <h2 id="dart-versions" class="hash-header">Dart Versions <a href="#dart-versions" class="hash-link">#</a></h2> <ul> <li>Dart 2: >= 2.14</li> </ul> <h2 id="maintainers" class="hash-header">Maintainers <a href="#maintainers" class="hash-link">#</a></h2> <ul> <li><a href="https://github.com/felangel" rel="ugc">Felix Angelov</a></li> </ul> </section></div></div></div><aside class="detail-info-box"><a class="packages-scores" href="/packages/replay_bloc/score"><div class="packages-score packages-score-like"><div class="packages-score-value -has-value"><span class="packages-score-value-number">181</span><span class="packages-score-value-sign"></span></div><div class="packages-score-label">likes</div></div><div class="packages-score packages-score-health"><div class="packages-score-value -has-value"><span class="packages-score-value-number">160</span><span class="packages-score-value-sign"></span></div><div class="packages-score-label">points</div></div><div class="packages-score packages-score-downloads" title="Number of downloads of this package during the past 30 days"><div class="packages-score-value -has-value"><span class="packages-score-value-number">10.3k</span><span class="packages-score-value-sign"></span></div><div class="packages-score-label">downloads</div></div></a><div class="detail-screenshot-thumbnail"><div class="thumbnail-container" data-thumbnail="/packages/replay_bloc/versions/0.3.0/gen-res/gen/logo.webp" data-thumbnail-descriptions-json="["The replay bloc package logo."]" data-ga-click-event="screenshot-thumbnail-click"><img class="thumbnail-image" src="/packages/replay_bloc/versions/0.3.0/gen-res/gen/190x190/logo.webp" alt="screenshot" title="View screenshots" tabindex="0"/></div><img class="collections-icon" src="/static/hash-mh7qv2oc/img/collections_white_24dp.svg" alt="" width="30" height="30" role="presentation"/></div><h3 class="title">Publisher</h3><p><a href="/publishers/bloclibrary.dev"><img class="-pub-publisher-shield filter-invert-on-dark" src="/static/hash-mh7qv2oc/img/material-icon-verified.svg" alt="verified publisher" width="14" height="14" title="Published by a pub.dev verified publisher"/>bloclibrary.dev</a></p><h3 class="title">Weekly Downloads</h3><div id="-weekly-downloads-sparkline" class="weekly-downloads-sparkline" data-widget="weekly-sparkline" data-weekly-sparkline-points="ADjnZ7UIAAA8CgAAAgoAACkJAACdCQAA1ggAAOQHAAC5BgAA7wkAALEKAAA/CgAA4gcAAAMEAACkBAAA+QkAAOIKAAD/CQAAgAkAAJwLAACJCgAAUQkAAJwHAAANCgAASAoAADYLAAD8CgAAqAkAAMIIAAA/DAAA3gcAAEcJAACjCQAA/QYAALIIAAC/CAAAGAkAADMJAAByCQAAlAkAAGYIAADyBwAA1gkAAD0IAAB9BwAAogkAADwKAAD1CAAAbQkAAC4KAAAaCgAA+ggAACULAAA="></div><h3 class="title pkg-infobox-metadata">Metadata</h3><p>An extension to the bloc state management library which adds support for undo and redo.</p><p><a class="link" href="https://bloclibrary.dev" rel="ugc">Homepage</a><br/><a class="link" href="https://github.com/felangel/bloc/tree/master/packages/replay_bloc" rel="ugc">Repository (GitHub)</a><br/><a 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class="title">License</h3><p><img class="inline-icon-img filter-invert-on-dark" src="/static/hash-mh7qv2oc/img/material-icon-balance.svg" alt="" width="14" height="14" role="presentation"/>MIT (<a href="/packages/replay_bloc/license">license</a>)</p><h3 class="title">Dependencies</h3><p><a href="/packages/bloc" title="^9.0.0">bloc</a></p><h3 class="title">More</h3><p><a href="/packages?q=dependency%3Areplay_bloc" rel="nofollow">Packages that depend on replay_bloc</a></p></aside></div><script type="application/ld+json">{"@context":"http\u003a\u002f\u002fschema.org","@type":"SoftwareSourceCode","name":"replay\u005fbloc","version":"0.3.0","description":"replay\u005fbloc - An extension to the bloc state management library which adds support for undo and redo.","url":"https\u003a\u002f\u002fpub.dev\u002fpackages\u002freplay\u005fbloc","dateCreated":"2020-07-04T04\u003a12\u003a36.811358Z","dateModified":"2025-01-12T21\u003a50\u003a27.559100Z","programmingLanguage":"Dart","image":"https\u003a\u002f\u002fpub.dev\u002fstatic\u002fimg\u002fpub-dev-icon-cover-image.png","license":"https\u003a\u002f\u002fpub.dev\u002fpackages\u002freplay\u005fbloc\u002flicense"}</script></div><div class="detail-metadata"><h3 class="detail-metadata-title"><span class="detail-metadata-toggle">←</span> Metadata</h3><div class="detail-info-box"><a class="packages-scores" href="/packages/replay_bloc/score"><div class="packages-score packages-score-like"><div class="packages-score-value -has-value"><span class="packages-score-value-number">181</span><span class="packages-score-value-sign"></span></div><div class="packages-score-label">likes</div></div><div class="packages-score packages-score-health"><div class="packages-score-value -has-value"><span 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which adds support for undo and redo.</p><p><a class="link" href="https://bloclibrary.dev" rel="ugc">Homepage</a><br/><a class="link" href="https://github.com/felangel/bloc/tree/master/packages/replay_bloc" rel="ugc">Repository (GitHub)</a><br/><a class="link" href="https://github.com/felangel/bloc/issues" rel="ugc">View/report issues</a><br/><a class="link" href="https://github.com/felangel/bloc/blob/master/CONTRIBUTING.md" rel="ugc">Contributing</a><br/></p><h3 class="title">Topics</h3><p><a class="topics-tag" href="/packages?q=topic%3Abloc" rel="nofollow">#bloc</a> <a class="topics-tag" href="/packages?q=topic%3Astate-management" rel="nofollow">#state-management</a> <a class="topics-tag" href="/packages?q=topic%3Areplay" rel="nofollow">#replay</a> <a class="topics-tag" href="/packages?q=topic%3Aundo" rel="nofollow">#undo</a> <a class="topics-tag" href="/packages?q=topic%3Aredo" rel="nofollow">#redo</a></p><h3 class="title">Documentation</h3><p><a class="link" 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