Input System

The input system translates browser events into editor transactions. It consists of several registries and handlers that plugins use to register keymaps, input rules, and file handlers.

InputManager

Facade that coordinates all input-related handlers. Created internally by the editor.

import { InputManager } from '@notectl/core';
import type { InputManagerDeps } from '@notectl/core';

InputManagerDeps

interface InputManagerDeps {
  readonly getState: () => EditorState;
  readonly dispatch: (tr: Transaction) => void;
  readonly syncSelection: () => void;
  readonly undo: () => void;
  readonly redo: () => void;
  readonly schemaRegistry?: SchemaRegistry;
  readonly keymapRegistry?: KeymapRegistry;
  readonly inputRuleRegistry?: InputRuleRegistry;
  readonly fileHandlerRegistry?: FileHandlerRegistry;
  readonly isReadOnly: () => boolean;
  readonly getPasteInterceptors?: () => readonly PasteInterceptorEntry[];
  readonly getTextDirection?: (element: HTMLElement) => 'ltr' | 'rtl';
  readonly navigateFromGapCursor?: (
    state: EditorState,
    direction: 'left' | 'right' | 'up' | 'down',
    container?: HTMLElement,
  ) => Transaction | null;
}

Constructor

const manager = new InputManager(contentElement, deps);

Properties

Property	Type	Description
compositionTracker	CompositionTracker	Tracks IME composition state

Methods

Method	Description
destroy()	Removes all event listeners and cleans up resources

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KeymapRegistry

Stores keymaps registered by plugins, organized by priority level.

import { KeymapRegistry } from '@notectl/core';

const registry = new KeymapRegistry();

Methods

Method	Signature	Description
registerKeymap	(keymap: Keymap, options?: KeymapOptions) => void	Register a keymap at a priority level
getKeymaps	() => readonly Keymap[]	Get all keymaps (flat list)
getKeymapsByPriority	() => { context, navigation, default }	Get keymaps grouped by priority
removeKeymap	(keymap: Keymap) => void	Remove a specific keymap
clear	() => void	Remove all keymaps

Priority System

Keymaps are dispatched in priority order: context > navigation > default.

type KeymapPriority = 'context' | 'navigation' | 'default';

interface KeymapOptions {
  readonly priority?: KeymapPriority;
}

Priority	Use Case
context	Context-sensitive shortcuts (e.g. code block Tab handling)
navigation	Caret/selection movement (e.g. arrow keys, Home/End)
default	General commands (e.g. Ctrl+B for bold) — this is the default

Keymap Types

type KeymapHandler = () => boolean;
type Keymap = Readonly<Record<string, KeymapHandler>>;

A Keymap maps key descriptors to handlers. Handlers return true if they consumed the event.

Key descriptors use the format Mod-B, Shift-Enter, Alt-ArrowUp, etc. Mod maps to Cmd on macOS and Ctrl on other platforms.

normalizeKeyDescriptor(e)

Normalizes a KeyboardEvent into a consistent key descriptor string. Format: "Mod-Shift-Alt-Key" where Mod = Ctrl/Cmd.

import { normalizeKeyDescriptor } from '@notectl/core';

// Takes a KeyboardEvent, not a string
element.addEventListener('keydown', (e) => {
  const descriptor = normalizeKeyDescriptor(e);
  // e.g. 'Mod-B', 'Mod-Shift-1', 'Enter', 'Space'
});

function normalizeKeyDescriptor(e: KeyboardEvent): string

---

InputRuleRegistry

Stores pattern-based text transform rules registered by plugins.

import { InputRuleRegistry } from '@notectl/core';

const registry = new InputRuleRegistry();

Methods

Method	Signature	Description
registerInputRule	(rule: InputRule) => void	Register an input rule
getInputRules	() => readonly InputRule[]	Get all registered rules
removeInputRule	(rule: InputRule) => void	Remove a specific rule
clear	() => void	Remove all rules

InputRule Interface

interface InputRule {
  readonly pattern: RegExp;
  handler(
    state: EditorState,
    match: RegExpMatchArray,
    start: number,
    end: number,
  ): Transaction | null;
}

Input rules are matched against text as the user types. When a pattern matches, the handler is called with the match and can return a transaction to apply.

Example — auto-convert # to heading:

const headingRule: InputRule = {
  pattern: /^(#{1,6})\s$/,
  handler(state, match, start, end) {
    const level = match[1].length;
    return state.transaction('input')
      .deleteTextAt(blockId, start, end)
      .setBlockType(blockId, nodeType('heading'), { level })
      .build();
  },
};

---

FileHandlerRegistry

Manages handlers for dropped or pasted files, matched by MIME type patterns.

import { FileHandlerRegistry } from '@notectl/core';

const registry = new FileHandlerRegistry();

Methods

Method	Signature	Description
registerFileHandler	(pattern: string, handler: FileHandler) => void	Register a handler for a MIME pattern
getFileHandlers	() => readonly FileHandlerEntry[]	Get all registered handlers
matchFileHandlers	(mimeType: string) => FileHandler[]	Find handlers matching a MIME type
removeFileHandler	(handler: FileHandler) => void	Remove a specific handler
clear	() => void	Remove all handlers

Types

type FileHandler = (
  file: File,
  position: Position | null,
) => boolean | Promise<boolean>;

interface FileHandlerEntry {
  readonly pattern: string;
  readonly handler: FileHandler;
}

MIME Pattern Matching

Patterns support wildcards:

Pattern	Matches
image/*	image/png, image/jpeg, etc.
text/plain	Only text/plain
*/*	Any MIME type

Example:

registry.registerFileHandler('image/*', async (file, position) => {
  const url = URL.createObjectURL(file);
  // Insert image block at position
  return true; // handled
});

---

ClipboardHandler

Handles copy and cut operations, serializing the selection to text/plain and text/html clipboard formats.

import { ClipboardHandler } from '@notectl/core';

const handler = new ClipboardHandler(element, {
  getState: () => editor.getState(),
  dispatch: (tr) => editor.dispatch(tr),
  schemaRegistry,
  syncSelection: () => { /* ... */ },
  isReadOnly: () => false,
});

Constructor Options

The constructor accepts an options object with the following shape (the type itself is not exported):

{
  readonly getState: () => EditorState;
  readonly dispatch: (tr: Transaction) => void;
  readonly schemaRegistry?: SchemaRegistry;
  readonly syncSelection?: () => void;
  readonly isReadOnly?: () => boolean;
}

Methods

Method	Description
destroy()	Removes clipboard event listeners

The ClipboardHandler automatically listens for copy and cut events on the provided element. For cut operations, it dispatches a deleteSelectionCommand after writing to the clipboard.

---

CompositionTracker

Tracks IME (Input Method Editor) composition state for languages like Chinese, Japanese, and Korean.

import { CompositionTracker } from '@notectl/core';

const tracker = new CompositionTracker();

Properties

Property	Type	Description
isComposing	boolean	Whether an IME composition is active
activeBlockId	BlockId | null	The block where composition is happening

Methods

Method	Signature	Description
start	(blockId: BlockId) => void	Begin composition tracking
end	() => void	End composition tracking

CompositionState Interface

interface CompositionState {
  readonly isComposing: boolean;
  readonly activeBlockId: BlockId | null;
}

The CompositionTracker implements this interface. During composition, the editor defers DOM reconciliation to avoid interfering with the IME.

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Related

• Plugin Interface — registerKeymap(), registerInputRule(), registerFileHandler()
• Commands — commands dispatched by keymaps
• Keyboard Navigation — guide to keyboard shortcuts