Merge pull request #869 from LucasXu0/documentation/flowy_editor

Documentation for AppFlowyEditor

.github/workflows/flowy_editor_test.yml

@@ -30,7 +30,7 @@ jobs:
           cache: true
 
       - name: Run FlowyEditor tests
-        working-directory: frontend/app_flowy/packages/flowy_editor
+        working-directory: frontend/app_flowy/packages/appflowy_editor
         run: |
           flutter pub get
           flutter test

frontend/app_flowy/analysis_options.yaml

@@ -14,7 +14,7 @@ analyzer:
   exclude:
     - "**/*.g.dart"
     - "**/*.freezed.dart"
-    - "packages/flowy_editor/**"
+    - "packages/appflowy_editor/**"
     - "packages/editor/**"
     # - "packages/flowy_infra_ui/**"
 linter:

frontend/app_flowy/linux/flutter/generated_plugin_registrant.cc

@@ -7,6 +7,7 @@
 #include "generated_plugin_registrant.h"
 
 #include <flowy_infra_ui/flowy_infra_u_i_plugin.h>
+#include <rich_clipboard_linux/rich_clipboard_plugin.h>
 #include <url_launcher_linux/url_launcher_plugin.h>
 #include <window_size/window_size_plugin.h>
 
@@ -14,6 +15,9 @@ void fl_register_plugins(FlPluginRegistry* registry) {
   g_autoptr(FlPluginRegistrar) flowy_infra_ui_registrar =
       fl_plugin_registry_get_registrar_for_plugin(registry, "FlowyInfraUIPlugin");
   flowy_infra_u_i_plugin_register_with_registrar(flowy_infra_ui_registrar);
+  g_autoptr(FlPluginRegistrar) rich_clipboard_linux_registrar =
+      fl_plugin_registry_get_registrar_for_plugin(registry, "RichClipboardPlugin");
+  rich_clipboard_plugin_register_with_registrar(rich_clipboard_linux_registrar);
   g_autoptr(FlPluginRegistrar) url_launcher_linux_registrar =
       fl_plugin_registry_get_registrar_for_plugin(registry, "UrlLauncherPlugin");
   url_launcher_plugin_register_with_registrar(url_launcher_linux_registrar);

frontend/app_flowy/linux/flutter/generated_plugins.cmake

@@ -4,6 +4,7 @@
 
 list(APPEND FLUTTER_PLUGIN_LIST
   flowy_infra_ui
+  rich_clipboard_linux
   url_launcher_linux
   window_size
 )

frontend/app_flowy/macos/Flutter/GeneratedPluginRegistrant.swift

@@ -11,6 +11,7 @@ import flowy_infra_ui
 import flowy_sdk
 import package_info_plus_macos
 import path_provider_macos
+import rich_clipboard_macos
 import shared_preferences_macos
 import url_launcher_macos
 import window_size
@@ -22,6 +23,7 @@ func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   FlowySdkPlugin.register(with: registry.registrar(forPlugin: "FlowySdkPlugin"))
   FLTPackageInfoPlusPlugin.register(with: registry.registrar(forPlugin: "FLTPackageInfoPlusPlugin"))
   PathProviderPlugin.register(with: registry.registrar(forPlugin: "PathProviderPlugin"))
+  RichClipboardPlugin.register(with: registry.registrar(forPlugin: "RichClipboardPlugin"))
   SharedPreferencesPlugin.register(with: registry.registrar(forPlugin: "SharedPreferencesPlugin"))
   UrlLauncherPlugin.register(with: registry.registrar(forPlugin: "UrlLauncherPlugin"))
   WindowSizePlugin.register(with: registry.registrar(forPlugin: "WindowSizePlugin"))

frontend/app_flowy/packages/appflowy_editor/.gitignore

@@ -19,7 +19,7 @@ migrate_working_dir/
 # The .vscode folder contains launch configuration and tasks you configure in
 # VS Code which you may wish to be included in version control, so this line
 # is commented out by default.
-#.vscode/
+.vscode/
 
 # Flutter/Dart/Pub related
 # Libraries should not include pubspec.lock, per https://dart.dev/guides/libraries/private-files#pubspeclock.
@@ -28,3 +28,4 @@ migrate_working_dir/
 .dart_tool/
 .packages
 build/
+coverage/

frontend/app_flowy/packages/appflowy_editor/CHANGELOG.md

@@ -0,0 +1,11 @@
+## 0.0.1
+
+* 实现基础的编辑器样式
+    * heading
+    * bold / 斜体 / underline / 删除线
+    * checkbox 
+    * bulleted list
+* 实现可扩展的编辑器框架
+* IME 的支持
+* 样式的复制粘贴
+* slash 快捷输入

frontend/app_flowy/packages/appflowy_editor/LICENSE

@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
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+
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+
+  12. No Surrender of Others' Freedom.
+
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+  13. Remote Network Interaction; Use with the GNU General Public License.
+
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+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
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+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
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+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
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+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

frontend/app_flowy/packages/appflowy_editor/README.md

@@ -0,0 +1,93 @@
+<!-- 
+This README describes the package. If you publish this package to pub.dev,
+this README's contents appear on the landing page for your package.
+
+For information about how to write a good package README, see the guide for
+[writing package pages](https://dart.dev/guides/libraries/writing-package-pages). 
+
+For general information about developing packages, see the Dart guide for
+[creating packages](https://dart.dev/guides/libraries/create-library-packages)
+and the Flutter guide for
+[developing packages and plugins](https://flutter.dev/developing-packages). 
+-->
+
+<h1 align="center"><b>AppFlowy Editor</b></h1>
+
+<p align="center">A highly customizable rich-text editor for Flutter</p>
+
+
+<div align="center">
+    <img src="documentation/images/example.png" width = "900"/>
+</div>
+
+## Key Features
+
+* Allow you to build rich, intuitive editors
+* Design and modify it your way by customizing components, shortcut events, and many more coming soon including menu options and themes
+* [Test-covered](https://github.com/LucasXu0/AppFlowy/blob/documentation/appflowy_editor/frontend/app_flowy/packages/appflowy_editor/documentation/testing.md) and maintained by AppFlowy's core team along with a community of more than 1,000 builders
+
+
+## Getting started
+
+```shell
+flutter pub add appflowy_editor
+flutter pub get
+```
+
+## How to use
+
+Let's create a new AppFlowyEditor object 
+```dart
+final editorState = EditorState.empty(); // an empty state
+final editor = AppFlowyEditor(
+    editorState: editorState,
+    keyEventHandlers: const [],
+    customBuilders: const {},
+);
+```
+
+You can also create an editor from a JSON file
+```dart
+final json = ...;
+final editorState = EditorState(StateTree.fromJson(data));
+final editor = AppFlowyEditor(
+    editorState: editorState,
+    keyEventHandlers: const [],
+    customBuilders: const {},
+);
+```
+
+To get a sense for how you might use it, run this example:
+```shell
+git clone https://github.com/AppFlowy-IO/AppFlowy.git
+cd frontend/app_flowy/packages/appflowy_editor/example
+flutter run
+```
+
+
+## How to customize 
+### Customize a component
+Please refer to [customizing a component](documentation/customizing.md#customizing-a-custom-component) for more details.
+
+
+### Customize a shortcut event
+Please refer to [customizing a shortcut event](documentation/customizing.md#customizing-a-custom-shortcut-event) for more details.
+
+## More Examples
+* Customize a component
+    * [Checkbox Text](https://github.com/LucasXu0/AppFlowy/blob/documentation/appflowy_editor/frontend/app_flowy/packages/appflowy_editor/lib/src/render/rich_text/checkbox_text.dart) shows you how to extend new styles based on existing rich text components
+    * [Image](https://github.com/LucasXu0/AppFlowy/blob/documentation/appflowy_editor/frontend/app_flowy/packages/appflowy_editor/example/lib/plugin/image_node_widget.dart) teaches you how to extend a new node and render it
+    * And more examples on [rich-text plugins](https://github.com/LucasXu0/AppFlowy/tree/documentation/appflowy_editor/frontend/app_flowy/packages/appflowy_editor/lib/src/render/rich_text)
+* Customize a shortcut event
+    * [BIUS](https://github.com/LucasXu0/AppFlowy/blob/documentation/appflowy_editor/frontend/app_flowy/packages/appflowy_editor/lib/src/service/internal_key_event_handlers/update_text_style_by_command_x_handler.dart) shows you how to make text bold/italic/underline/strikethrough through shortcut keys
+    * [Paste HTML](https://github.com/LucasXu0/AppFlowy/blob/documentation/appflowy_editor/frontend/app_flowy/packages/appflowy_editor/lib/src/service/internal_key_event_handlers/copy_paste_handler.dart) gives you an idea on how to handle pasted styles through shortcut keys
+    * Need more examples? Check out [Internal key event handlers](https://github.com/LucasXu0/AppFlowy/tree/documentation/appflowy_editor/frontend/app_flowy/packages/appflowy_editor/lib/src/service/internal_key_event_handlers)
+
+## Glossary
+Please refer to the API documentation (link).
+
+## Contributing
+Contributions are what make the open source community such an amazing place to be learn, inspire, and create. Any contributions you make are greatly appreciated. Please look at [CONTRIBUTING.md](https://appflowy.gitbook.io/docs/essential-documentation/contribute-to-appflowy/contributing-to-appflowy) for details.
+
+## License
+Distributed under the AGPLv3 License. See LICENSE for more information.

frontend/app_flowy/packages/appflowy_editor/assets/images/toolbar/center.svg

@@ -0,0 +1,5 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M4 4L12 4" stroke="#00BCF0" stroke-linecap="round" stroke-linejoin="round"/>
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+<path d="M4 12L12 12" stroke="#00BCF0" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>

frontend/app_flowy/packages/appflowy_editor/assets/images/toolbar/h1.svg

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+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
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+</svg>

frontend/app_flowy/packages/appflowy_editor/assets/images/toolbar/h2.svg

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+</svg>

frontend/app_flowy/packages/appflowy_editor/assets/images/toolbar/h3.svg

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+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
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+</svg>

frontend/app_flowy/packages/appflowy_editor/assets/images/toolbar/highlight.svg

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+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M13 7.87829V5.125C13 4.82663 12.8946 4.54048 12.7071 4.3295C12.5196 4.11853 12.2652 4 12 4H4C3.73478 4 3.48043 4.11853 3.29289 4.3295C3.10536 4.54048 3 4.82663 3 5.125V10.875C3 11.1734 3.10536 11.4595 3.29289 11.6705C3.48043 11.8815 3.73478 12 4 12H8.44737" stroke="white" stroke-linecap="round" stroke-linejoin="round"/>
+<rect width="1" height="4" rx="0.5" transform="matrix(-1 0 0 1 13.5 10)" fill="white"/>
+<rect width="1" height="4" rx="0.5" transform="matrix(1.19249e-08 -1 -1 -1.19249e-08 15 12.5)" fill="white"/>
+</svg>

frontend/app_flowy/packages/appflowy_editor/assets/images/toolbar/left.svg

@@ -0,0 +1,5 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M4 4L12 4" stroke="white" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M4 8H10" stroke="white" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M4 12L12 12" stroke="white" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>

frontend/app_flowy/packages/appflowy_editor/assets/images/toolbar/link.svg

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+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M7 8.91521C7.21574 9.22582 7.49099 9.48283 7.80707 9.66881C8.12315 9.85479 8.47268 9.96538 8.83194 9.99309C9.1912 10.0208 9.5518 9.96497 9.88926 9.8294C10.2267 9.69383 10.5332 9.48169 10.7878 9.20736L12.2949 7.58431C12.7525 7.07413 13.0056 6.39083 12.9999 5.68156C12.9942 4.9723 12.73 4.29384 12.2643 3.7923C11.7986 3.29075 11.1686 3.00627 10.51 3.0001C9.85142 2.99394 9.21693 3.26659 8.7432 3.75935L7.87913 4.68448" stroke="#00BCF0" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M9 7.08479C8.78426 6.77418 8.50901 6.51717 8.19293 6.33119C7.87685 6.14521 7.52732 6.03462 7.16806 6.00691C6.8088 5.9792 6.4482 6.03503 6.11074 6.1706C5.77327 6.30617 5.46683 6.51831 5.21218 6.79264L3.7051 8.41569C3.24755 8.92587 2.99437 9.60918 3.00009 10.3184C3.00582 11.0277 3.26998 11.7062 3.73569 12.2077C4.2014 12.7092 4.8314 12.9937 5.48999 12.9999C6.14858 13.0061 6.78307 12.7334 7.2568 12.2407L8.11584 11.3155" stroke="#00BCF0" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>

frontend/app_flowy/packages/appflowy_editor/assets/images/toolbar/right.svg

@@ -0,0 +1,5 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M4 4L12 4" stroke="white" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M6 8H12" stroke="white" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M4 12L12 12" stroke="white" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>

frontend/app_flowy/packages/appflowy_editor/documentation/contributing.md

@@ -0,0 +1,17 @@
+# Contributing
+
+## Reporting Bugs
+Please click this [link](https://github.com/AppFlowy-IO/AppFlowy/issues/new?assignees=&labels=bug,editor&template=bug_report.md&title=%5BFlowyEditor%20Bug%5D+Untitled+Bug+Issue) to report bugs.
+
+![](../documentation/images/reporting_bugs.png)
+
+## Technical Discussion And Support
+Discord link ...
+
+## Submitting Pull Request
+
+We welcome and appreciate your pull request submissions, and we have many good-first-issue-for-devs or help-wanted issues that we welcome you to implement.
+
+As [README](../README.md) said, we want to make sure that the code you submit will not affect the existing code logic and functionality, so please attach the corresponding test for each PR submission, and it is recommended to add a brief description of the test case and scope to the test. For more details, please see [TESTING.md](./testing.md)
+
+Finally, to repeat, since the AppFlowyEditor is a community-driven open source editor, we take every PR seriously and feel very much for everyone's contribution.

frontend/app_flowy/packages/appflowy_editor/documentation/customizing.md

@@ -0,0 +1,286 @@
+# How to customize ...
+
+## Customize a shortcut event
+
+We will use a simple example to illustrate how to quickly add a shortcut event.
+
+For example, typing `_xxx_` will be converted into _xxx_.
+
+Let's start with a blank document.
+
+```dart
+@override
+Widget build(BuildContext context) {
+  return Scaffold(
+    body: Container(
+      alignment: Alignment.topCenter,
+      child: AppFlowyEditor(
+        editorState: EditorState.empty(),
+        keyEventHandlers: const [],
+      ),
+    ),
+  );
+}
+```
+
+At this point, nothing magic will happen after typing `_xxx_`.
+
+![Before](./images/customizing_a_shortcut_event_before.gif)
+
+Next, we will create a function to handle an underscore input.
+
+```dart
+import 'package:appflowy_editor/appflowy_editor.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+FlowyKeyEventHandler underscoreToItalicHandler = (editorState, event) {
+  // Since we only need to handler the input of `underscore`.
+  // All inputs except `underscore` will be ignored directly.
+  if (event.logicalKey != LogicalKeyboardKey.underscore) {
+    return KeyEventResult.ignored;
+  }
+};
+```
+
+Then, we need to determine if the currently selected node is `TextNode` and the selection is collapsed.
+
+```dart
+// ...
+FlowyKeyEventHandler underscoreToItalicHandler = (editorState, event) {
+  // ...
+  
+  // Obtaining the selection and selected nodes of the current document through `selectionService`.
+  // And determine whether the selection is collapsed and whether the selected node is a text node.
+  final selectionService = editorState.service.selectionService;
+  final selection = selectionService.currentSelection.value;
+  final textNodes = selectionService.currentSelectedNodes.whereType<TextNode>();
+  if (selection == null || !selection.isSingle || textNodes.length != 1) {
+    return KeyEventResult.ignored;
+  }
+```
+
+Now, we start dealing with underscore. 
+
+Look for the position of the previous underscore and 
+1. return, if not found. 
+2. if found, the text wrapped in between two underscores will be displayed in italic.
+
+```dart
+// ...
+FlowyKeyEventHandler underscoreToItalicHandler = (editorState, event) {
+  // ...
+
+  final textNode = textNodes.first;
+  final text = textNode.toRawString();
+  // Determine if `underscore` already exists in the text node
+  final previousUnderscore = text.indexOf('_');
+  if (previousUnderscore == -1) {
+    return KeyEventResult.ignored;
+  }
+
+  // Delete the previous `underscore`,
+  // update the style of the text surrounded by two underscores to `italic`,
+  // and update the cursor position.
+  TransactionBuilder(editorState)
+    ..deleteText(textNode, previousUnderscore, 1)
+    ..formatText(
+      textNode,
+      previousUnderscore,
+      selection.end.offset - previousUnderscore - 1,
+      {'italic': true},
+    )
+    ..afterSelection = Selection.collapsed(
+      Position(path: textNode.path, offset: selection.end.offset - 1),
+    )
+    ..commit();
+
+  return KeyEventResult.handled;
+};
+```
+
+So far, the 'underscore handler' function is done and the only task left is to inject it into the AppFlowyEditor.
+
+```dart
+@override
+Widget build(BuildContext context) {
+  return Scaffold(
+    body: Container(
+      alignment: Alignment.topCenter,
+      child: AppFlowyEditor(
+        editorState: EditorState.empty(),
+        keyEventHandlers: [
+            underscoreToItalicHandler,
+        ],
+      ),
+    ),
+  );
+}
+```
+
+![After](./images/customizing_a_shortcut_event_after.gif)
+
+[Complete code example]()
+
+## Customize a component
+We will use a simple example to showcase how to quickly add a custom component.
+
+For example, we want to render an image from the network.
+
+To start with, let's create an empty document by running commands as follows:
+
+```dart
+@override
+Widget build(BuildContext context) {
+  return Scaffold(
+    body: Container(
+      alignment: Alignment.topCenter,
+      child: AppFlowyEditor(
+        editorState: EditorState.empty(),
+        keyEventHandlers: const [],
+      ),
+    ),
+  );
+}
+```
+
+Next, we choose a unique string for your custom node's type. We use `network_image` in this case. And we add `network_image_src` to the `attributes` to describe the link of the image.
+
+> For the definition of the [Node](), please refer to this [link]().
+
+```JSON
+{
+  "type": "network_image",
+  "attributes": {
+    "network_image_src": "https://docs.flutter.dev/assets/images/dash/dash-fainting.gif"
+  }
+}
+```
+
+Then, we create a class that inherits [NodeWidgetBuilder](). As shown in the autoprompt, we need to implement two functions:
+1. one returns a widget 
+2. the other verifies the correctness of the [Node]().
+
+
+```dart
+import 'package:appflowy_editor/appflowy_editor.dart';
+import 'package:flutter/material.dart';
+
+class NetworkImageNodeWidgetBuilder extends NodeWidgetBuilder {
+  @override
+  Widget build(NodeWidgetContext<Node> context) {
+    throw UnimplementedError();
+  }
+
+  @override
+  NodeValidator<Node> get nodeValidator => throw UnimplementedError();
+}
+```
+
+Now, let's implement a simple image widget based on `Image`.
+
+**It is important to note that the `State` of the returned `Widget` must be with [Selectable]().**
+
+> For the definition of the [Selectable](), please refer to this [link]().
+
+```dart
+class _NetworkImageNodeWidget extends StatefulWidget {
+  const _NetworkImageNodeWidget({
+    Key? key,
+    required this.node,
+  }) : super(key: key);
+
+  final Node node;
+
+  @override
+  State<_NetworkImageNodeWidget> createState() =>
+      __NetworkImageNodeWidgetState();
+}
+
+class __NetworkImageNodeWidgetState extends State<_NetworkImageNodeWidget>
+    with Selectable {
+  RenderBox get _renderBox => context.findRenderObject() as RenderBox;
+
+  @override
+  Widget build(BuildContext context) {
+    return Image.network(
+      widget.node.attributes['network_image_src'],
+      height: 200,
+      loadingBuilder: (context, child, loadingProgress) =>
+          loadingProgress == null ? child : const CircularProgressIndicator(),
+    );
+  }
+
+  @override
+  Position start() => Position(path: widget.node.path, offset: 0);
+
+  @override
+  Position end() => Position(path: widget.node.path, offset: 1);
+
+  @override
+  Position getPositionInOffset(Offset start) => end();
+
+  @override
+  List<Rect> getRectsInSelection(Selection selection) =>
+      [Offset.zero & _renderBox.size];
+
+  @override
+  Selection getSelectionInRange(Offset start, Offset end) => Selection.single(
+        path: widget.node.path,
+        startOffset: 0,
+        endOffset: 1,
+      );
+
+  @override
+  Offset localToGlobal(Offset offset) => _renderBox.localToGlobal(offset);
+}
+```
+
+Finally, we return `_NetworkImageNodeWidget` in the `build` function of `NetworkImageNodeWidgetBuilder` and register `NetworkImageNodeWidgetBuilder` into `AppFlowyEditor`.
+
+```dart
+class NetworkImageNodeWidgetBuilder extends NodeWidgetBuilder {
+  @override
+  Widget build(NodeWidgetContext<Node> context) {
+    return _NetworkImageNodeWidget(
+      key: context.node.key,
+      node: context.node,
+    );
+  }
+
+  @override
+  NodeValidator<Node> get nodeValidator => (node) {
+        return node.type == 'network_image' &&
+            node.attributes['network_image_src'] is String;
+      };
+}
+```
+
+```dart
+final editorState = EditorState(
+  document: StateTree.empty()
+    ..insert(
+      [0],
+      [
+        TextNode.empty(),
+        Node.fromJson({
+          'type': 'network_image',
+          'attributes': {
+            'network_image_src':
+                'https://docs.flutter.dev/assets/images/dash/dash-fainting.gif'
+          }
+        })
+      ],
+    ),
+);
+return AppFlowyEditor(
+  editorState: editorState,
+  customBuilders: {
+    'network_image': NetworkImageNodeWidgetBuilder(),
+  },
+);
+```
+
+![](./images/customizing_a_component.gif)
+
+[Here you can check out the complete code file of this example]()

frontend/app_flowy/packages/appflowy_editor/documentation/testing.md

@@ -0,0 +1,128 @@
+# Testing
+
+> The directory structure of test files is consistent with the code files, making it easy for us to map a file with the corresponding test and check if the test is updated
+
+## Testing Functions
+
+**Construct a document for testing**
+```dart
+const text = 'Welcome to Appflowy 😁';
+// Get the instance of editor.
+final editor = tester.editor;
+// Insert empty text node.
+editor.insertEmptyTextNode();
+// Insert text node with string.
+editor.insertTextNode(text);
+// Insert text node with heading style.
+editor.insertTextNode(text, attributes: {
+    StyleKey.subtype: StyleKey.heading,
+    StyleKey.heading: StyleKey.h1,
+});
+// Insert text node with bulleted list style and bold style.
+editor.insertTextNode(
+    '',
+    attributes: {
+        StyleKey.subtype: StyleKey.bulletedList,
+    },
+    delta: Delta([
+        TextInsert(text, {StyleKey.bold: true}),
+    ]),
+);
+```
+
+**The `startTesting` function must be called before testing**.
+```dart
+await editor.startTesting();
+```
+
+**Get the number of nodes in the document**
+```dart
+final length = editor.documentLength;
+print(length);
+```
+
+**Get the node of a defined path**
+```dart
+final firstTextNode = editor.nodeAtPath([0]) as TextNode;
+```
+
+**Update selection**
+```dart
+await editor.updateSelection(
+    Selection.single(path: firstTextNode.path, startOffset: 0),
+);
+```
+
+**Get the selection**
+```dart
+final selection = editor.documentSelection;
+print(selection);
+```
+
+**Simulate shortcut event inputs**
+```dart
+// Command + A.
+await editor.pressLogicKey(LogicalKeyboardKey.keyA, isMetaPressed: true);
+// Command + shift + S.
+await editor.pressLogicKey(
+    LogicalKeyboardKey.keyS, 
+    isMetaPressed: true, 
+    isShiftPressed: true,
+);
+```
+
+**Simulate a text input**
+```dart
+// Insert 'Hello World' at the beginning of the first node.
+editor.insertText(firstTextNode, 'Hello World', 0);
+```
+
+**Get information about the text node**
+```dart
+// Get plain text.
+final textAfterInserted = firstTextNode.toRawString();
+print(textAfterInserted);
+// Get attributes.
+final attributes = firstTextNode.attributes;
+print(attributes);
+```
+
+## Example
+For example, we are going to test `select_all_handler.dart`
+
+
+```dart
+import 'package:appflowy_editor/appflowy_editor.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import '../../infra/test_editor.dart';
+
+void main() async {
+  setUpAll(() {
+    TestWidgetsFlutterBinding.ensureInitialized();
+  });
+
+  group('select_all_handler_test.dart', () {
+    testWidgets('Presses Command + A in the document', (tester) async {
+      const lines = 100;
+      const text = 'Welcome to Appflowy 😁';
+      final editor = tester.editor;
+      for (var i = 0; i < lines; i++) {
+        editor.insertTextNode(text);
+      }
+      await editor.startTesting();
+      await editor.pressLogicKey(LogicalKeyboardKey.keyA, isMetaPressed: true);
+
+      expect(
+        editor.documentSelection,
+        Selection(
+          start: Position(path: [0], offset: 0),
+          end: Position(path: [lines - 1], offset: text.length),
+        ),
+      );
+    });
+  });
+}
+```
+
+For more information about testing, such as simulating a click, please refer to [An introduction to widget testing](https://docs.flutter.dev/cookbook/testing/widget/introduction) 

frontend/app_flowy/packages/appflowy_editor/example/assets/example.json

@@ -6,7 +6,7 @@
       {
         "type": "image",
         "attributes": {
-          "image_src": "https://s1.ax1x.com/2022/07/28/vCgz1x.png"
+          "image_src": "https://images.squarespace-cdn.com/content/v1/617f6f16b877c06711e87373/c3f23723-37f4-44d7-9c5d-6e2a53064ae7/Asset+10.png"
         }
       },
       {
@@ -25,7 +25,7 @@
         "type": "text",
         "delta": [
           {
-            "insert": "👋 Welcome to Appflowy"
+            "insert": "👋 Welcome to FlowyEditor"
           }
         ],
         "attributes": {
@@ -37,11 +37,24 @@
         "type": "text",
         "delta": [
           {
-            "insert": "At "
+            "insert": "To be honest, we are still in the alpha stage. There are still many functions that need to be completed. And we are developing more features. Please give us a star if the "
           },
-          { "insert": "AppFlowy", "attributes": { "code": true, "bold": true, "color": "0xFFED459C"} },
           {
-            "insert": ", we embody what we value deep in our hearts, taking inspiration from other great companies while forging our own path. AppFlowy’s five core values are Mission Driven, Aim High & Iterate, Transparency, Collaboration, and Honesty. Together, they spell MATCH. We will continue to iterate and refine these values as we grow."
+            "insert": "FlowyEditor",
+            "attributes": {
+              "href": "https://github.com/AppFlowy-IO/AppFlowy"
+            }
+          },
+          {
+            "insert": " helps you. 😊😊😊"
+          }
+        ]
+      },
+      {
+        "type": "text",
+        "delta": [
+          {
+            "insert": "Since the FlowyEditor are a community-driven open source editor, we very welcome and appreciate every pull request submissions from everyone.😄😄😄"
           }
         ]
       },
@@ -76,7 +89,7 @@
             "attributes": { "backgroundColor": "0xFFFFFF00" }
           },
           {
-            "insert": "to see all the types of content you can add - entity, headers, videos, sub pages, etc."
+            "insert": "to see all the types of content you can add - headers, bulleted lists, checkboxes, etc."
           }
         ]
       },
@@ -84,7 +97,11 @@
         "type": "text",
         "delta": [
           {
-            "insert": "Highlight any text, and use the menu that pops up to "
+            "insert": "Highlight",
+            "attributes": { "backgroundColor": "0xFF00BCFB" }
+          },
+          {
+            "insert": " any text, and use the menu that pops up to "
           },
           { "insert": "style", "attributes": { "bold": true } },
           { "insert": " your ", "attributes": { "italic": true } },
@@ -245,62 +262,6 @@
           "subtype": "number-list",
           "number": 3
         }
-      },
-      {
-        "type": "text",
-        "delta": [
-          {
-            "insert": "At AppFlowy, we embody what we value deep in our hearts, taking inspiration from other great companies while forging our own path. AppFlowy’s five core values are Mission Driven, Aim High & Iterate, Transparency, Collaboration, and Honesty. Together, they spell MATCH. We will continue to iterate and refine these values as we grow."
-          }
-        ]
-      },
-      {
-        "type": "text",
-        "delta": [
-          {
-            "insert": "At AppFlowy, we embody what we value deep in our hearts, taking inspiration from other great companies while forging our own path. AppFlowy’s five core values are Mission Driven, Aim High & Iterate, Transparency, Collaboration, and Honesty. Together, they spell MATCH. We will continue to iterate and refine these values as we grow."
-          }
-        ]
-      },
-      {
-        "type": "text",
-        "delta": [
-          {
-            "insert": "At AppFlowy, we embody what we value deep in our hearts, taking inspiration from other great companies while forging our own path. AppFlowy’s five core values are Mission Driven, Aim High & Iterate, Transparency, Collaboration, and Honesty. Together, they spell MATCH. We will continue to iterate and refine these values as we grow."
-          }
-        ]
-      },
-      {
-        "type": "text",
-        "delta": [
-          {
-            "insert": "At AppFlowy, we embody what we value deep in our hearts, taking inspiration from other great companies while forging our own path. AppFlowy’s five core values are Mission Driven, Aim High & Iterate, Transparency, Collaboration, and Honesty. Together, they spell MATCH. We will continue to iterate and refine these values as we grow."
-          }
-        ]
-      },
-      {
-        "type": "text",
-        "delta": [
-          {
-            "insert": "At AppFlowy, we embody what we value deep in our hearts, taking inspiration from other great companies while forging our own path. AppFlowy’s five core values are Mission Driven, Aim High & Iterate, Transparency, Collaboration, and Honesty. Together, they spell MATCH. We will continue to iterate and refine these values as we grow."
-          }
-        ]
-      },
-      {
-        "type": "text",
-        "delta": [
-          {
-            "insert": "At AppFlowy, we embody what we value deep in our hearts, taking inspiration from other great companies while forging our own path. AppFlowy’s five core values are Mission Driven, Aim High & Iterate, Transparency, Collaboration, and Honesty. Together, they spell MATCH. We will continue to iterate and refine these values as we grow."
-          }
-        ]
-      },
-      {
-        "type": "text",
-        "delta": [
-          {
-            "insert": "At AppFlowy, we embody what we value deep in our hearts, taking inspiration from other great companies while forging our own path. AppFlowy’s five core values are Mission Driven, Aim High & Iterate, Transparency, Collaboration, and Honesty. Together, they spell MATCH. We will continue to iterate and refine these values as we grow."
-          }
-        ]
       }
     ]
   }