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# Flutter Quill
<p align="center" style="background-color:#282C34">
<img src="https://user-images.githubusercontent.com/10923085/119221946-2de89000-baf2-11eb-8285-68168a78c658.png" width="600px">
</p>
<h1 align="center">A rich text editor for Flutter</h1>
[![MIT License][license-badge]][license-link]
[![PRs Welcome][prs-badge]][prs-link]
[![Watch on GitHub][github-watch-badge]][github-watch-link]
[![Star on GitHub][github-star-badge]][github-star-link]
[![Watch on GitHub][github-forks-badge]][github-forks-link]
[license-badge]: https://img.shields.io/github/license/singerdmx/flutter-quill.svg?style=for-the-badge
[license-link]: https://github.com/singerdmx/flutter-quill/blob/master/LICENSE
[prs-badge]: https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=for-the-badge
[prs-link]: https://github.com/singerdmx/flutter-quill/issues
[github-watch-badge]: https://img.shields.io/github/watchers/singerdmx/flutter-quill.svg?style=for-the-badge&logo=github&logoColor=ffffff
[github-watch-link]: https://github.com/singerdmx/flutter-quill/watchers
[github-star-badge]: https://img.shields.io/github/stars/singerdmx/flutter-quill.svg?style=for-the-badge&logo=github&logoColor=ffffff
[github-star-link]: https://github.com/singerdmx/flutter-quill/stargazers
[github-forks-badge]: https://img.shields.io/github/forks/singerdmx/flutter-quill.svg?style=for-the-badge&logo=github&logoColor=ffffff
[github-forks-link]: https://github.com/singerdmx/flutter-quill/network/members
---
FlutterQuill is a rich text editor and a [Quill] component for [Flutter].
This library is a WYSIWYG editor built for the modern Android, iOS, web and desktop platforms. Check out our [Youtube Playlist] or [Code Introduction] to take a detailed walkthrough of the code base. You can join our [Slack Group] for discussion.
Pub: [FlutterQuill]
## Table of contents
- [Flutter Quill](#flutter-quill)
- [Table of contents](#table-of-contents)
- [Demo](#demo)
- [Installation](#installation)
- [Usage](#usage)
- [Migration](#migration)
- [Input / Output](#input--output)
- [Configurations](#configurations)
- [Using Custom App Widget](#using-custom-app-widget)
- [Font Size](#font-size)
- [Font Family](#font-family)
- [Custom Buttons](#custom-buttons)
- [Embed Blocks](#embed-blocks)
- [Using the embed blocks from `flutter_quill_extensions`](#using-the-embed-blocks-from-flutter_quill_extensions)
- [Custom Size Image for Mobile](#custom-size-image-for-mobile)
- [Custom Size Image for other platforms (excluding web)](#custom-size-image-for-other-platforms-excluding-web)
- [Custom Embed Blocks](#custom-embed-blocks)
- [Custom Toolbar](#custom-toolbar)
- [Translation](#translation)
- [](#)
- [Contributing to translations](#contributing-to-translations)
- [Conversion to HTML](#conversion-to-html)
- [Testing](#testing)
- [License](#license)
- [Contributors](#contributors)
- [Sponsors](#sponsors)
## Demo
<p float="left">
<img width="400" alt="1" src="https://user-images.githubusercontent.com/122956/103142422-9bb19c80-46b7-11eb-83e4-dd0538a9236e.png">
<img width="400" alt="1" src="https://user-images.githubusercontent.com/122956/103142455-0531ab00-46b8-11eb-89f8-26a77de9227f.png">
</p>
<p float="left">
<img width="400" alt="1" src="https://user-images.githubusercontent.com/122956/102963021-f28f5a00-449c-11eb-8f5f-6e9dd60844c4.png">
<img width="400" alt="1" src="https://user-images.githubusercontent.com/122956/102977404-c9c88e00-44b7-11eb-9423-b68f3b30b0e0.png">
</p>
---
## Installation
```yaml
dependencies:
flutter_quill: ^<latest-version-here>
```
<p align="center">OR</p>
```yaml
dependencies:
flutter_quill:
git: https://github.com/singerdmx/flutter-quill.git
```
> **Important note**
>
> Currently, we're in the process of refactoring the library's configurations. We're actively working on this, and while we don't have a development version available at the moment, your feedback is essential to us.
>
> Using the latest version and reporting any issues you encounter on GitHub will greatly contribute to the improvement of the library. Your input and insights are valuable in shaping a stable and reliable version for all our users. Thank you for being part of the open-source community!
>
> also [flutter_quill_extensions](https://pub.dev/packages/flutter_quill_extensions) will not work with the latest versions, please use [fresh_quill_extensions](https://pub.dev/packages/fresh_quill_extensions) as temporary alternative
>
## Usage
See the `example` directory for a minimal example of how to use FlutterQuill. You typically just need to instantiate a controller:
```dart
QuillController _controller = QuillController.basic();
```
and then embed the toolbar and the editor, within your app. For example:
```dart
QuillProvider(
configurations: QuillConfigurations(
controller: _controller,
sharedConfigurations: const QuillSharedConfigurations(
locale: Locale('de'),
),
),
child: Column(
children: [
const QuillToolbar(),
Expanded(
child: QuillEditor.basic(
configurations: const QuillEditorConfigurations(
readOnly: false,
),
),
)
],
),
)
```
And depending on your use case, you might want to dispose the `_controller` in dispose mehtod
Check out [Sample Page] for more advanced usage.
## Migration
We have recently add [migration guide](/doc/migration.md) for migration from different versions
## Input / Output
This library uses [Quill] as an internal data format.
* Use `_controller.document.toDelta()` to extract the deltas.
* Use `_controller.document.toPlainText()` to extract plain text.
FlutterQuill provides some JSON serialization support, so that you can save and open documents. To save a document as JSON, do something like the following:
```dart
var json = jsonEncode(_controller.document.toDelta().toJson());
```
You can then write this to storage.
To open a FlutterQuill editor with an existing JSON representation that you've previously stored, you can do something like this:
```dart
var myJSON = jsonDecode(r'{"insert":"hello\n"}');
_controller = QuillController(
document: Document.fromJson(myJSON),
selection: TextSelection.collapsed(offset: 0),
);
```
## Configurations
The `QuillToolbar` class lets you customize which formatting options are available.
[Sample Page] provides sample code for advanced usage and configuration.
For **web development**, use `flutter config --enable-web` for flutter or use [ReactQuill] for React.
It is required to provide `EmbedBuilder`, e.g. [defaultEmbedBuildersWeb](https://github.com/singerdmx/flutter-quill/blob/master/example/lib/universal_ui/universal_ui.dart#L99).
Also it is required to provide `webImagePickImpl`, e.g. [Sample Page](https://github.com/singerdmx/flutter-quill/blob/master/example/lib/pages/home_page.dart#L317).
For **desktop platforms** It is required to provide `filePickImpl` for toolbar image button, e.g. [Sample Page](https://github.com/singerdmx/flutter-quill/blob/master/example/lib/pages/home_page.dart#L297).
### Using Custom App Widget
This project use some adaptive widgets like `AdaptiveTextSelectionToolbar` which require the following delegates:
1. Default Material Localizations delegate
2. Default Cupertino Localizations delegate
3. Defualt Widgets Localizations delegate
You don't need to include those since there are defined by default
but if you are using Custom app or you are overriding the `localizationsDelegates` in the App widget
then please make sure it's including those:
```dart
localizationsDelegates: const [
DefaultCupertinoLocalizations.delegate,
DefaultMaterialLocalizations.delegate,
DefaultWidgetsLocalizations.delegate,
],
```
And you might need more depending on your use case, for example if you are using custom localizations for your app, using custom app widget like [FluentApp](https://pub.dev/packages/fluent_ui)
which will also need
```dart
localizationsDelegates: const [
// Required localizations delegates ...
FluentLocalizations.delegate,
AppLocalizations.delegate,
],
```
in addition to the required delegates by this library
### Font Size
Within the editor toolbar, a drop-down with font-sizing capabilities is available. This can be enabled or disabled with `showFontSize`.
When enabled, the default font-size values can be modified via _optional_ `fontSizeValues`. `fontSizeValues` accepts a `Map<String, String>` consisting of a `String` title for the font size and a `String` value for the font size. Example:
```dart
fontSizeValues: const {'Small': '8', 'Medium': '24.5', 'Large': '46'}
```
Font size can be cleared with a value of `0`, for example:
```dart
fontSizeValues: const {'Small': '8', 'Medium': '24.5', 'Large': '46', 'Clear': '0'}
```
### Font Family
To use your own fonts, update your [assets folder](https://github.com/singerdmx/flutter-quill/tree/master/example/assets/fonts) and pass in `fontFamilyValues`. More details at [this change](https://github.com/singerdmx/flutter-quill/commit/71d06f6b7be1b7b6dba2ea48e09fed0d7ff8bbaa), [this article](https://stackoverflow.com/questions/55075834/fontfamily-property-not-working-properly-in-flutter) and [this](https://www.flutterbeads.com/change-font-family-flutter/).
### Custom Buttons
You may add custom buttons to the _end_ of the toolbar, via the `customButtons` option, which is a `List` of `QuillCustomButton`.
To add an Icon, we should use a new QuillCustomButton class
```dart
QuillCustomButton(
iconData: Icons.ac_unit,
onTap: () {
debugPrint('snowflake');
}
),
```
Each `QuillCustomButton` is used as part of the `customButtons` option as follows:
```dart
QuillToolbar(
configurations: QuillToolbarConfigurations(
customButtons: [
QuillCustomButton(
iconData: Icons.ac_unit,
onTap: () {
debugPrint('snowflake1');
},
),
QuillCustomButton(
iconData: Icons.ac_unit,
onTap: () {
debugPrint('snowflake2');
},
),
QuillCustomButton(
iconData: Icons.ac_unit,
onTap: () {
debugPrint('snowflake3');
},
),
],
),
),
```
## Embed Blocks
As of version 6.0, embed blocks are not provided by default as part of this package. Instead, this package provides an interface to all the user to provide there own implementations for embed blocks. Implementations for image, video and formula embed blocks is proved in a separate package [`flutter_quill_extensions`](https://pub.dev/packages/flutter_quill_extensions).
Provide a list of embed
### Using the embed blocks from `flutter_quill_extensions`
```dart
QuillToolbar(
configurations: QuillToolbarConfigurations(
embedButtons: FlutterQuillEmbeds.toolbarButtons(
imageButtonOptions: QuillToolbarImageButtonOptions(
onImagePickCallback: (file) async {
return file.path;
},
),
),
),
),
```
```dart
Expanded(
child: QuillEditor.basic(
configurations: QuillEditorConfigurations(
readOnly: true,
embedBuilders: FlutterQuillEmbeds.editorBuilders(
imageEmbedConfigurations:
const QuillEditorImageEmbedConfigurations(
forceUseMobileOptionMenuForImageClick: true,
),
),
),
),
)
```
<!-- This should be added in the extensions package for better organization -->
<!-- > [!WARNING]
>
> If you are using [flutter_quill_extensions](https://pub.dev/packages/flutter_quill_extensions) package to add support for images, videos and more
> The extensions package require additional configurations:
>
> 1. We are using [`gal`](https://github.com/natsuk4ze/) plugin to save images.
> For this to work, you need to add the appropriate permissions
> to your `Info.plist` and `AndroidManifest.xml` files.
> See <https://github.com/natsuk4ze/gal#-get-started> to add the needed lines.
>
> 2. We also use [`image_picker`](https://pub.dev/packages/image_picker) plugin for picking images so please make sure follow the instructions
>
> 3. For loading the image from the internet we need internet permission
> 1. For Android, you need to add some permissions in `AndroidManifest.xml`, Please follow this [link](https://developer.android.com/training/basics/network-ops/connecting) for more info, the internet permission included by default only for debugging so you need to follow this link to add it in the release version too. you should allow loading images and videos only for the `https` protocol but if you want http too then you need to configure your android application to accept `http` in the release mode, follow this [link](https://stackoverflow.com/questions/45940861/android-8-cleartext-http-traffic-not-permitted) for more info.
> 2. for macOS you also need to include a key in your `Info.plist`, please follow this [link](https://stackoverflow.com/a/61201081/18519412) to add the required configurations
>
> The extensions package also use [image_picker](https://pub.dev/packages/image_picker) which also require some configurations, follow this [link](https://pub.dev/packages/image_picker#installation). It's needed for Android, iOS, macOS, we must inform you that you can't pick photo using camera in desktop so make sure to handle that if you plan on add support for desktop, this might changed in the future and for more info follow this [link](https://pub.dev/packages/image_picker#windows-macos-and-linux) -->
### Custom Size Image for Mobile
Define `mobileWidth`, `mobileHeight`, `mobileMargin`, `mobileAlignment` as follows:
```dart
{
"insert": {
"image": "https://user-images.githubusercontent.com/122956/72955931-ccc07900-3d52-11ea-89b1-d468a6e2aa2b.png"
},
"attributes":{
"style":"mobileWidth: 50; mobileHeight: 50; mobileMargin: 10; mobileAlignment: topLeft"
}
}
```
### Custom Size Image for other platforms (excluding web)
Define `width`, `height`, `margin`, `alignment` as follows:
```dart
{
"insert": {
"image": "https://user-images.githubusercontent.com/122956/72955931-ccc07900-3d52-11ea-89b1-d468a6e2aa2b.png"
},
"attributes":{
"style":"width: 50; height: 50; margin: 10; alignment: topLeft"
}
}
```
### Custom Embed Blocks
Sometimes you want to add some custom content inside your text, custom widgets inside of them. An example is adding notes to the text, or anything custom that you want to add in your text editor.
The only thing that you need is to add a `CustomBlockEmbed` and provider a builder for it to the `embedBuilders` parameter, to transform the data inside of the Custom Block into a widget!
Here is an example:
Starting with the `CustomBlockEmbed`, here we extend it and add the methods that are useful for the 'Note' widget, that will be the `Document`, used by the `flutter_quill` to render the rich text.
```dart
class NotesBlockEmbed extends CustomBlockEmbed {
const NotesBlockEmbed(String value) : super(noteType, value);
static const String noteType = 'notes';
static NotesBlockEmbed fromDocument(Document document) =>
NotesBlockEmbed(jsonEncode(document.toDelta().toJson()));
Document get document => Document.fromJson(jsonDecode(data));
}
```
After that, we need to map this "notes" type into a widget. In that case, I used a `ListTile` with a text to show the plain text resume of the note, and the `onTap` function to edit the note.
Don't forget to add this method to the `QuillEditor` after that!
```dart
class NotesEmbedBuilder extends EmbedBuilder {
NotesEmbedBuilder({required this.addEditNote});
Future<void> Function(BuildContext context, {Document? document}) addEditNote;
@override
String get key => 'notes';
@override
Widget build(
BuildContext context,
QuillController controller,
Embed node,
bool readOnly,
bool inline,
TextStyle textStyle,
) {
final notes = NotesBlockEmbed(node.value.data).document;
return Material(
color: Colors.transparent,
child: ListTile(
title: Text(
notes.toPlainText().replaceAll('\n', ' '),
maxLines: 3,
overflow: TextOverflow.ellipsis,
),
leading: const Icon(Icons.notes),
onTap: () => addEditNote(context, document: notes),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10),
side: const BorderSide(color: Colors.grey),
),
),
);
}
}
```
And finally, we write the function to add/edit this note. The `showDialog` function shows the QuillEditor to edit the note, after the user ends the edition, we check if the document has something, and if it has, we add or edit the `NotesBlockEmbed` inside of a `BlockEmbed.custom` (this is a little detail that will not work if you don't pass the `CustomBlockEmbed` inside of a `BlockEmbed.custom`).
```dart
Future<void> _addEditNote(BuildContext context, {Document? document}) async {
final isEditing = document != null;
final quillEditorController = QuillController(
document: document ?? Document(),
selection: const TextSelection.collapsed(offset: 0),
);
await showDialog(
context: context,
builder: (context) => AlertDialog(
titlePadding: const EdgeInsets.only(left: 16, top: 8),
title: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Text('${isEditing ? 'Edit' : 'Add'} note'),
IconButton(
onPressed: () => Navigator.of(context).pop(),
icon: const Icon(Icons.close),
)
],
),
content: QuillEditor.basic(
controller: quillEditorController,
readOnly: false,
),
),
);
if (quillEditorController.document.isEmpty()) return;
final block = BlockEmbed.custom(
NotesBlockEmbed.fromDocument(quillEditorController.document),
);
final controller = _controller!;
final index = controller.selection.baseOffset;
final length = controller.selection.extentOffset - index;
if (isEditing) {
final offset = getEmbedNode(controller, controller.selection.start).offset;
controller.replaceText(
offset, 1, block, TextSelection.collapsed(offset: offset));
} else {
controller.replaceText(index, length, block, null);
}
}
```
And voila, we have a custom widget inside of the rich text editor!
<p float="left">
<img width="400" alt="1" src="https://i.imgur.com/yBTPYeS.png">
</p>
> 1. For more info and a video example, see the [PR of this feature](https://github.com/singerdmx/flutter-quill/pull/877)
> 2. For more details, check out [this YouTube video](https://youtu.be/pI5p5j7cfHc)
### Custom Toolbar
If you want to use custom toolbar but still want the support of this libray
You can use the `QuillBaseToolbar` which is the base for the `QuillToolbar`
> If you are using the toolbar buttons like `QuillToolbarHistoryButton`, `QuillToolbarToggleStyleButton` in the somewhere like the the custom toolbar then you must provide them with `QuillToolbarProvider` inherited widget, you don't have to do this if you are using the `QuillToolbar` since it will be done for you
Example:
```dart
QuillProvider(
configurations: QuillConfigurations(
controller: _controller,
sharedConfigurations: const QuillSharedConfigurations(),
),
child: Column(
children: [
QuillToolbarProvider(
toolbarConfigurations: const QuillToolbarConfigurations(),
child: QuillBaseToolbar(
configurations: QuillBaseToolbarConfigurations(
toolbarSize: 15 * 2,
multiRowsDisplay: false,
childrenBuilder: (context) {
final controller = context.requireQuillController;
return [
QuillToolbarHistoryButton(
controller: controller,
options: const QuillToolbarHistoryButtonOptions(
isUndo: true),
),
QuillToolbarHistoryButton(
controller: controller,
options: const QuillToolbarHistoryButtonOptions(
isUndo: false),
),
QuillToolbarToggleStyleButton(
attribute: Attribute.bold,
controller: controller,
options: const QuillToolbarToggleStyleButtonOptions(
iconData: Icons.format_bold,
iconSize: 20,
),
),
QuillToolbarToggleStyleButton(
attribute: Attribute.italic,
controller: controller,
options: const QuillToolbarToggleStyleButtonOptions(
iconData: Icons.format_italic,
iconSize: 20,
),
),
QuillToolbarToggleStyleButton(
attribute: Attribute.underline,
controller: controller,
options: const QuillToolbarToggleStyleButtonOptions(
iconData: Icons.format_underline,
iconSize: 20,
),
),
QuillToolbarClearFormatButton(
controller: controller,
options: const QuillToolbarClearFormatButtonOptions(
iconData: Icons.format_clear,
iconSize: 20,
),
),
VerticalDivider(
indent: 12,
endIndent: 12,
color: Colors.grey.shade400,
),
QuillToolbarSelectHeaderStyleButtons(
controller: controller,
options:
const QuillToolbarSelectHeaderStyleButtonsOptions(
iconSize: 20,
),
),
QuillToolbarToggleStyleButton(
attribute: Attribute.ol,
controller: controller,
options: const QuillToolbarToggleStyleButtonOptions(
iconData: Icons.format_list_numbered,
iconSize: 20,
),
),
QuillToolbarToggleStyleButton(
attribute: Attribute.ul,
controller: controller,
options: const QuillToolbarToggleStyleButtonOptions(
iconData: Icons.format_list_bulleted,
iconSize: 20,
),
),
QuillToolbarToggleStyleButton(
attribute: Attribute.blockQuote,
controller: controller,
options: const QuillToolbarToggleStyleButtonOptions(
iconData: Icons.format_quote,
iconSize: 20,
),
),
VerticalDivider(
indent: 12,
endIndent: 12,
color: Colors.grey.shade400,
),
QuillToolbarIndentButton(
controller: controller,
isIncrease: true,
options: const QuillToolbarIndentButtonOptions(
iconData: Icons.format_indent_increase,
iconSize: 20,
)),
QuillToolbarIndentButton(
controller: controller,
isIncrease: false,
options: const QuillToolbarIndentButtonOptions(
iconData: Icons.format_indent_decrease,
iconSize: 20,
),
),
];
},
),
),
),
Expanded(
child: QuillEditor.basic(
configurations: const QuillEditorConfigurations(
readOnly: false,
placeholder: 'Write your notes',
padding: EdgeInsets.all(16),
),
),
)
],
),
)
```
if you want more customized toolbar feel free to create your own and use the `controller` to interact with the editor. checkout the `QuillToolbar` and the buttons inside it to see an example of how that will works
### Translation
The package offers translations for the quill toolbar and editor, it will follow the system locale unless you set your own locale with:
```dart
QuillProvider(
configurations: QuillConfigurations(
controller: _controller,
sharedConfigurations: const QuillSharedConfigurations(
locale: Locale('fr'),
),
),
child: Column(
children: [
const QuillToolbar(
configurations: QuillToolbarConfigurations(),
),
Expanded(
child: QuillEditor.basic(
configurations: const QuillEditorConfigurations(),
),
)
],
),
)
```
###
Currently, translations are available for these 31 locales:
* `Locale('en')`
* `Locale('ar')`
* `Locale('bn')`
* `Locale('bs')`
* `Locale('cs')`
* `Locale('de')`
* `Locale('da')`
* `Locale('fr')`
* `Locale('he')`
* `Locale('zh', 'cn')`
* `Locale('zh', 'hk')`
* `Locale('ko')`
* `Locale('ru')`
* `Locale('es')`
* `Locale('tk')`
* `Locale('tr')`
* `Locale('uk')`
* `Locale('ur')`
* `Locale('pt')`
* `Locale('pl')`
* `Locale('vi')`
* `Locale('id')`
* `Locale('it')`
* `Locale('ms')`
* `Locale('nl')`
* `Locale('no')`
* `Locale('fa')`
* `Locale('hi')`
* `Locale('sr')`
* `Locale('sw')`
* `Locale('ja')`
#### Contributing to translations
The translation file is located at [toolbar.i18n.dart](lib/src/translations/toolbar.i18n.dart). Feel free to contribute your own translations, just copy the English translations map and replace the values with your translations. Then open a pull request so everyone can benefit from your translations!
## Conversion to HTML
Having your document stored in Quill Delta format is sometimes not enough. Often you'll need to convert
it to other formats such as HTML in order to publish it, or send an email. One option is to use
[vsc_quill_delta_to_html](https://pub.dev/packages/vsc_quill_delta_to_html) to convert your document
to HTML. This package has full support for all Quill operations - including images, videos, formulas,
tables, and mentions. Conversion can be performed in vanilla Dart (i.e., server-side or CLI) or in Flutter.
It is a complete Dart part of the popular and mature [quill-delta-to-html](https://www.npmjs.com/package/quill-delta-to-html)
Typescript/Javascript package.
## Testing
To aid in testing applications using the editor an extension to the flutter `WidgetTester` is provided which includes methods to simplify interacting with the editor in test cases.
Import the test utilities in your test file:
```dart
import 'package:flutter_quill/flutter_quill_test.dart';
```
and then enter text using `quillEnterText`:
```dart
await tester.quillEnterText(find.byType(QuillEditor), 'test\n');
```
## License
[MIT](LICENSE)
## Contributors
Special thanks for everyone that have contributed to this project...
<a href="https://github.com/singerdmx/flutter-quill/graphs/contributors">
<img src="https://contrib.rocks/image?repo=singerdmx/flutter-quill" />
</a>
<br>
Made with [contrib.rocks](https://contrib.rocks).
[Quill]: https://quilljs.com/docs/formats
[Flutter]: https://github.com/flutter/flutter
[FlutterQuill]: https://pub.dev/packages/flutter_quill
[ReactQuill]: https://github.com/zenoamaro/react-quill
[Youtube Playlist]: https://youtube.com/playlist?list=PLbhaS_83B97vONkOAWGJrSXWX58et9zZ2
[Slack Group]: https://join.slack.com/t/bulletjournal1024/shared_invite/zt-fys7t9hi-ITVU5PGDen1rNRyCjdcQ2g
[Sample Page]: https://github.com/singerdmx/flutter-quill/blob/master/example/lib/pages/home_page.dart
[Code Introduction]: https://github.com/singerdmx/flutter-quill/blob/master/CodeIntroduction.md
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[中文文档](./doc_cn.md)