`CUndoStack`

Core · extends CObject

Linear undo history. Commands must execute synchronously. Do not call stack mutation methods from a command's undo()/redo()/mergeWith().

import { CUndoStack } from "canvas-toolkit-lib";

Declared members

readonly indexChanged: CSignal<[number]>;

readonly canUndoChanged: CSignal<[boolean]>;

readonly canRedoChanged: CSignal<[boolean]>;

readonly undoTextChanged: CSignal<[string]>;

readonly redoTextChanged: CSignal<[string]>;

readonly cleanChanged: CSignal<[boolean]>;

constructor(parent?: CObject | null);

count(): number;

index(): number;

cleanIndex(): number;

isClean(): boolean;

canUndo(): boolean;

canRedo(): boolean;

undoText(): string;

redoText(): string;

command(index: number): CUndoCommand | null;

push(command: CUndoCommand): void;

undo(): void;

redo(): void;

setIndex(index: number): void;

Out-of-range indices are clamped; non-integer indices are rejected.

setClean(): void;

resetClean(): void;

clear(): void;

Discards history without undoing its effects.

destroy(): void;