docs: update customizing.md

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

@@ -16,7 +16,7 @@ Widget build(BuildContext context) {
       alignment: Alignment.topCenter,
       child: AppFlowyEditor(
         editorState: EditorState.empty(),
-        keyEventHandlers: const [],
+        shortcutEvents: const [],
       ),
     ),
   );
@@ -27,19 +27,26 @@ At this point, nothing magic will happen after typing `_xxx_`.
 
 ![Before](./images/customizing_a_shortcut_event_before.gif)
 
-To implement our shortcut event we will create a function to handle an underscore input.
+To implement our shortcut event we will create a `ShortcutEvent` instance to handle an underscore input.
+
+We need to define `key` and `command` in a ShortCutEvent object to customize hotkeys. We recommend using the description of your event as a key. For example, if the underscore `_` is defined to make text italic, the key can be 'Underscore to italic'. 
+
+> The command, made up of a single keyword such as `underscore` or a combination of keywords using the `+` sign in between to concatenate, is a condition that triggers a user-defined function. To see which keywords are available to define a command, please refer to [key_mapping.dart](../lib/src/service/shortcut_event/key_mapping.dart).
+> If more than one commands trigger the same handler, then we use ',' to split them. For example, using CTRL and A or CMD and A to 'select all', we describe it as `cmd+a,ctrl+a`(case-insensitive).
 
 ```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 handle the input of an 'underscore' character,
-  // all inputs except `underscore` will be ignored immediately.
-  if (event.logicalKey != LogicalKeyboardKey.underscore) {
-    return KeyEventResult.ignored;
-  }
+ShortcutEvent underscoreToItalicEvent = ShortcutEvent(
+  key: 'Underscore to italic',
+  command: 'underscore',
+  handler: _underscoreToItalicHandler,
+);
+
+ShortcutEventHandler _underscoreToItalicHandler = (editorState, event) {
+
 };
 ```
 
@@ -49,9 +56,7 @@ If so, we will continue.
 
 ```dart
 // ...
-FlowyKeyEventHandler underscoreToItalicHandler = (editorState, event) {
-  // ...
-  
+ShortcutEventHandler _underscoreToItalicHandler = (editorState, event) {
   // Obtain the selection and selected nodes of the current document through the 'selectionService'
   // to determine whether the selection is collapsed and whether the selected node is a text node.
   final selectionService = editorState.service.selectionService;
@@ -70,7 +75,7 @@ Look for the position of the previous underscore and
 
 ```dart
 // ...
-FlowyKeyEventHandler underscoreToItalicHandler = (editorState, event) {
+ShortcutEventHandler _underscoreToItalicHandler = (editorState, event) {
   // ...
 
   final textNode = textNodes.first;
@@ -111,8 +116,8 @@ Widget build(BuildContext context) {
       alignment: Alignment.topCenter,
       child: AppFlowyEditor(
         editorState: EditorState.empty(),
-        keyEventHandlers: [
-            underscoreToItalicHandler,
+        shortcutEvents: [
+            _underscoreToItalicHandler,
         ],
       ),
     ),

frontend/app_flowy/packages/appflowy_editor/example/lib/plugin/underscore_to_italic_key_event_handler.dart

@@ -1,20 +1,13 @@
 import 'package:appflowy_editor/appflowy_editor.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter/services.dart';
 
 ShortcutEvent underscoreToItalicEvent = ShortcutEvent(
   key: 'Underscore to italic',
-  command: 'shift+underscore',
+  command: 'underscore',
   handler: _underscoreToItalicHandler,
 );
 
 ShortcutEventHandler _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;
-  }
-
   // Obtaining the selection and selected nodes of the current document through `selectionService`,
   // and determine whether it is a single selection and whether the selected node is a text node.
   final selectionService = editorState.service.selectionService;

frontend/app_flowy/packages/appflowy_editor/lib/src/service/shortcut_event/shortcut_event.dart

@@ -14,7 +14,7 @@ class ShortcutEvent {
     String? linuxCommand,
   }) {
     updateCommand(
-      command,
+      command: command,
       windowsCommand: windowsCommand,
       macOSCommand: macOSCommand,
       linuxCommand: linuxCommand,
@@ -46,35 +46,43 @@ class ShortcutEvent {
 
   final ShortcutEventHandler handler;
 
-  List<Keybinding> keybindings = [];
+  List<Keybinding> get keybindings => _keybindings;
+  List<Keybinding> _keybindings = [];
 
-  void updateCommand(
-    String command, {
+  void updateCommand({
+    String? command,
     String? windowsCommand,
     String? macOSCommand,
     String? linuxCommand,
   }) {
+    var matched = false;
     if (Platform.isWindows &&
         windowsCommand != null &&
         windowsCommand.isNotEmpty) {
       this.command = windowsCommand;
+      matched = true;
     } else if (Platform.isMacOS &&
         macOSCommand != null &&
         macOSCommand.isNotEmpty) {
       this.command = macOSCommand;
+      matched = true;
     } else if (Platform.isLinux &&
         linuxCommand != null &&
         linuxCommand.isNotEmpty) {
       this.command = linuxCommand;
-    } else {
+      matched = true;
+    } else if (command != null && command.isNotEmpty) {
       this.command = command;
+      matched = true;
     }
 
-    keybindings = this
-        .command
-        .split(',')
-        .map((e) => Keybinding.parse(e))
-        .toList(growable: false);
+    if (matched) {
+      _keybindings = this
+          .command
+          .split(',')
+          .map((e) => Keybinding.parse(e))
+          .toList(growable: false);
+    }
   }
 
   ShortcutEvent copyWith({

frontend/app_flowy/packages/appflowy_editor/test/service/shortcut_event/shortcut_event_test.dart

@@ -21,7 +21,7 @@ void main() async {
           return KeyEventResult.handled;
         },
       );
-      shortcutEvent.updateCommand('cmd+shift+alt+ctrl+b');
+      shortcutEvent.updateCommand(command: 'cmd+shift+alt+ctrl+b');
       expect(shortcutEvent.keybindings.length, 1);
       expect(shortcutEvent.keybindings.first.isMetaPressed, true);
       expect(shortcutEvent.keybindings.first.isShiftPressed, true);
@@ -57,15 +57,26 @@ void main() async {
       await editor.updateSelection(
         Selection.single(path: [1], startOffset: text.length),
       );
+
       for (final event in builtInShortcutEvents) {
         if (event.key == 'Move cursor begin') {
-          event.updateCommand('alt+arrow left');
+          event.updateCommand(
+            windowsCommand: 'alt+arrow left',
+            macOSCommand: 'alt+arrow left',
+          );
         }
       }
-      await editor.pressLogicKey(
-        LogicalKeyboardKey.arrowLeft,
-        isAltPressed: true,
-      );
+      if (Platform.isWindows || Platform.isMacOS) {
+        await editor.pressLogicKey(
+          LogicalKeyboardKey.arrowLeft,
+          isAltPressed: true,
+        );
+      } else {
+        await editor.pressLogicKey(
+          LogicalKeyboardKey.arrowLeft,
+          isMetaPressed: true,
+        );
+      }
       expect(
         editor.documentSelection,
         Selection.single(path: [1], startOffset: 0),