UndoService

Defined in: src/shell.ts:409

Multi-level undo/redo. Records are kept in memory only, are bounded by count and by size, and are dropped when the table or view they belong to is closed.

Example

const before = column.get(0);
column.set(0, 42);
DG.UndoService.push('Set value', () => column.set(0, before), {
  redo: () => column.set(0, 42),
  context: column.dataFrame
});

Constructors

Constructor

new UndoService(): UndoService

Returns

UndoService

Accessors

redoName

Get Signature

get static redoName(): string | null

Defined in: src/shell.ts:424

Returns

string | null

---

undoName

Get Signature

get static undoName(): string | null

Defined in: src/shell.ts:423

Returns

string | null

Methods

clear()

static clear(): void

Defined in: src/shell.ts:427

Drops both stacks.

Returns

void

---

ownScope()

static ownScope(element): void

Defined in: src/shell.ts:432

Claims Ctrl+Z for [element]: while focus is inside it, the platform does not undo. Use it for embedded editors (sketchers, graph editors, notebooks) that keep their own history, instead of installing a document-level key handler.

Parameters

Parameter	Type
element	HTMLElement

Returns

void

---

push()

static push(name, undo, options?): void

Defined in: src/shell.ts:412

Registers an undoable operation that has already been performed. Without [options.redo] the operation can be undone but not redone.

Parameters

Parameter	Type
name	string
undo	() => void
options?	{ context?: any; redo?: () => void; }
options.context?	any
options.redo?	() => void

Returns

void

---

releaseScope()

static releaseScope(element): void

Defined in: src/shell.ts:435

Returns Ctrl+Z to the platform. See ownScope.

Parameters

Parameter	Type
element	HTMLElement

Returns

void

---

run()

static run<T>(name, action, undo, options?): T

Defined in: src/shell.ts:417

Performs [action] and registers [undo] as its inverse.

Type Parameters

Type Parameter
T

Parameters

Parameter	Type
name	string
action	() => T
undo	() => void
options?	{ context?: any; redo?: () => void; }
options.context?	any
options.redo?	() => void

Returns

T