Module changeset 

Text editing changeset system

STATUS: The core types (TextChangeset, TextOperation, TextOp* structs) are actively used by window.rs, undo_redo.rs, event.rs, and platform code. The create_*_changeset free functions are not yet wired into event handling.

Architecture

This module implements a two-phase changeset system for all text editing operations:

1. Create changesets (pre-callback): Analyze what would change, don’t mutate yet
2. Apply changesets (post-callback): Actually mutate state if !preventDefault

This pattern enables:

• preventDefault support for ALL operations (not just text input)
• Undo/redo stack (record changesets before applying)
• Validation (check bounds, permissions before mutation)
• Inspection (user callbacks can see planned changes)

Structs

TextChangeset

A text editing changeset that can be inspected before application

TextOpClearSelection

Clear all selections

TextOpCopy

Copy selection to clipboard (no text change)

TextOpCut

Cut selection to clipboard (deletes text)

TextOpDeleteText

Delete text in range

TextOpExtendSelection

Extend selection in a direction

TextOpInsertText

Insert text at cursor position

TextOpMoveCursor

Move cursor to new position

TextOpPaste

Paste from clipboard (inserts text)

TextOpReplaceText

Replace text in range with new text

TextOpSelectAll

Select all text in node

TextOpSetSelection

Set selection to new range

Enums

CursorMovement

Type of cursor movement

SelectionDirection

Re-export from events module Direction of cursor movement or selection expansion.

TextOperation

Text editing operation (what will change)

Functions

create_copy_changeset

Creates a copy changeset from the current selection.

create_cut_changeset

Creates a cut changeset from the current selection.

create_delete_selection_changeset

Creates a delete changeset for the current selection or single character.

create_paste_changeset

Creates a paste changeset at the current cursor position.

create_select_all_changeset

Creates a select-all changeset for the target node.

Type Aliases

ChangesetId

Unique identifier for a changeset (for undo/redo)