owl-bt/src/client/components/undoRedoManager/undoRedoManager.service.js

owl-bt is editor for Behavior trees. It has been inspired by Unreal engine behavior trees in a way, that it supports special node items like decorators and services. This makes trees smaller and much more readable.

'use strict';

import UndoManager from 'undo-manager';

angular.module('editorApp')
  .service('UndoRedoManager',
    class UndoRedoManager {
      constructor(undoStackSize) {
        this._undoManager = new UndoManager();
        this._undoManager.setLimit(undoStackSize);
      }

      /**
       * Add undo/redo command to stack
       * @param {undoRedoCommand} undoRedoCommand
       * @param {function} undoRedoCommand.undo - function to undo change
       * @param {function} undoRedoCommand.exec - function to redo change
       */
      add(undoRedoCommand) {
        this._undoManager.add({
          undo: undoRedoCommand.undo,
          redo: undoRedoCommand.exec
        });
      }

      undo() {
        this._undoManager.undo();
      }

      redo() {
        this._undoManager.redo();
      }

      clear() {
        this._undoManager.clear();
      }

      hasUndo() {
        return this._undoManager.hasUndo();
      }

      hasRedo() {
        return this._undoManager.hasRedo();
      }
    });