View Utilities

View-layer utilities for DOM interaction, caret positioning, and platform-specific behavior. These are used internally by the editor and exported for advanced plugin development.

Caret Navigation

Functions for navigating the cursor using DOM-based caret positioning.

endOfTextblock(container, state, direction, caretRect?)

Returns true if the caret is at the edge of a text block in the given direction. Used to determine when to cross block boundaries.

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

const atEnd: boolean = endOfTextblock(container, state, 'right');

Parameters:

Parameter	Type	Description
container	HTMLElement	The editor’s content element
state	EditorState	Current editor state
direction	CaretDirection	'left', 'right', 'up', or 'down'
caretRect	DOMRect | null	Optional cached caret rect for performance

navigateAcrossBlocks(state, direction)

Moves the cursor to the adjacent block when at a block boundary:

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

const tr = navigateAcrossBlocks(state, 'down');

navigateVerticalWithGoalColumn(container, state, direction, goalColumn)

Vertical navigation with goal column preservation (standard behavior for up/down arrow keys):

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

const tr = navigateVerticalWithGoalColumn(container, state, 'up', goalColumn);

skipInlineNode(state, direction)

Skips over an inline node (width-1 in offset space) when the cursor is adjacent to one:

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

const tr = skipInlineNode(state, 'right');

navigateFromGapCursor(state, direction, container?)

Navigates from a gap cursor position to the nearest editable block:

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

const tr = navigateFromGapCursor(state, 'down', container);

getCaretRectFromSelection(domSel)

Returns the bounding rect of the current DOM selection’s caret, or null if unavailable:

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

const rect: DOMRect | null = getCaretRectFromSelection(window.getSelection()!);

CaretDirection

type CaretDirection = 'left' | 'right' | 'up' | 'down';

---

NodeView

Custom rendering for block node types. When a NodeView is registered for a block type, the reconciler delegates rendering to it instead of using the default NodeSpec.toDOM().

interface NodeView {
  readonly dom: HTMLElement;
  readonly contentDOM: HTMLElement | null;
  getContentDOM?(childId: string): HTMLElement | null;
  update?(node: BlockNode): boolean;
  destroy?(): void;
  selectNode?(): void;
  deselectNode?(): void;
}

Properties

Property	Type	Description
dom	HTMLElement	The root DOM element managed by this view
contentDOM	HTMLElement | null	The element where text content is rendered. null for void nodes

Methods

Method	Description
getContentDOM(childId)	Returns the content container for a nested child block
update(node)	Called when the block’s data changes. Return true if handled, false to recreate
destroy()	Clean up DOM event listeners and resources
selectNode()	Called when the node receives a node selection
deselectNode()	Called when the node loses its node selection

NodeViewFactory

type NodeViewFactory = (
  node: BlockNode,
  getState: () => EditorState,
  dispatch: (tr: Transaction) => void,
) => NodeView;

Register via PluginContext.registerNodeView():

context.registerNodeView('code_block', (node, getState, dispatch) => {
  const dom = document.createElement('pre');
  dom.dataset.blockId = node.id;
  const contentDOM = document.createElement('code');
  dom.appendChild(contentDOM);
  return { dom, contentDOM };
});

---

NodeViewRegistry

Stores NodeViewFactory registrations.

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

const registry = new NodeViewRegistry();

Methods

Method	Signature	Description
registerNodeView	(type: string, factory: NodeViewFactory) => void	Register a factory for a node type
getNodeViewFactory	(type: string) => NodeViewFactory | undefined	Look up by type
removeNodeView	(type: string) => void	Remove a registration
clear	() => void	Remove all registrations

---

CursorWrapper

Manages cursor display during IME composition, ensuring the cursor remains visible and correctly positioned.

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

const wrapper = new CursorWrapper(container, schemaRegistry);

Properties

Property	Type	Description
isActive	boolean	Whether the cursor wrapper is currently active

Methods

Method	Signature	Description
onCompositionStart	(state: EditorState) => void	Activate the wrapper when composition begins
cleanup	() => void	Deactivate and remove the wrapper element

---

Platform Detection

Utility functions for detecting the current platform and text direction.

import { isMac, isFirefox, isWebKit, getTextDirection, isRtlContext } from '@notectl/core';

Function	Return Type	Description
isMac()	boolean	Returns true on macOS (used for Cmd vs Ctrl keybindings)
isFirefox()	boolean	Returns true in Firefox
isWebKit()	boolean	Returns true in WebKit/Safari
getTextDirection(element)	'ltr' | 'rtl'	Computes the text direction of an element
isRtlContext(element)	boolean	Returns true if the element is in a right-to-left context

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CSS Style Injection

Utilities for injecting CSS styles into the document or shadow DOM. Used by plugins that need to register custom stylesheets.

injectContentStyles(css, options?)

Injects CSS into the document via a <style> element:

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

const styleEl = injectContentStyles('.highlight { background: yellow }', {
  id: 'my-plugin-styles',
  nonce: 'abc123',
});

Options

interface InjectStylesOptions {
  readonly nonce?: string;
  readonly document?: Document;
  readonly container?: HTMLElement;
  readonly id?: string;
}

removeContentStyles(id, doc?)

Removes a previously injected <style> element by its id:

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

removeContentStyles('my-plugin-styles');

adoptContentStyles(css, options?)

Creates and adopts a CSSStyleSheet (for shadow DOM):

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

const sheet = adoptContentStyles('.highlight { background: yellow }', {
  target: shadowRoot,
});

Options

interface AdoptStylesOptions {
  readonly target?: Document | ShadowRoot;
  readonly replace?: boolean;
}

removeAdoptedStyles(sheet, target?)

Removes a previously adopted stylesheet:

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

removeAdoptedStyles(sheet, shadowRoot);

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Related

• Commands — view movement commands that use caret navigation
• Plugin Interface — registerNodeView(), registerStyleSheet()
• Schema — NodeSpec.toDOM() which NodeView overrides