three.js/editor/js/commands/SetSceneCommand.js

import { Command } from '../Command.js';
import { SetUuidCommand } from './SetUuidCommand.js';
import { SetValueCommand } from './SetValueCommand.js';
import { AddObjectCommand } from './AddObjectCommand.js';

/**
 * @param editor Editor
 * @param scene containing children to import
 * @constructor
 */
class SetSceneCommand extends Command {

	constructor( editor, scene = null ) {

		super( editor );

		this.type = 'SetSceneCommand';
		this.name = editor.strings.getKey( 'command/SetScene' );

		this.cmdArray = [];

		if ( scene !== null ) {

			this.cmdArray.push( new SetUuidCommand( this.editor, this.editor.scene, scene.uuid ) );
			this.cmdArray.push( new SetValueCommand( this.editor, this.editor.scene, 'name', scene.name ) );
			this.cmdArray.push( new SetValueCommand( this.editor, this.editor.scene, 'userData', JSON.parse( JSON.stringify( scene.userData ) ) ) );

			while ( scene.children.length > 0 ) {

				const child = scene.children.pop();
				this.cmdArray.push( new AddObjectCommand( this.editor, child ) );

			}

		}

	}

	execute() {

		this.editor.signals.sceneGraphChanged.active = false;

		for ( let i = 0; i < this.cmdArray.length; i ++ ) {

			this.cmdArray[ i ].execute();

		}

		this.editor.signals.sceneGraphChanged.active = true;
		this.editor.signals.sceneGraphChanged.dispatch();

	}

	undo() {

		this.editor.signals.sceneGraphChanged.active = false;

		for ( let i = this.cmdArray.length - 1; i >= 0; i -- ) {

			this.cmdArray[ i ].undo();

		}

		this.editor.signals.sceneGraphChanged.active = true;
		this.editor.signals.sceneGraphChanged.dispatch();

	}

	toJSON() {

		const output = super.toJSON( this );

		const cmds = [];
		for ( let i = 0; i < this.cmdArray.length; i ++ ) {

			cmds.push( this.cmdArray[ i ].toJSON() );

		}

		output.cmds = cmds;

		return output;

	}

	fromJSON( json ) {

		super.fromJSON( json );

		const cmds = json.cmds;
		for ( let i = 0; i < cmds.length; i ++ ) {

			const cmd = new window[ cmds[ i ].type ]();	// creates a new object of type "json.type"
			cmd.fromJSON( cmds[ i ] );
			this.cmdArray.push( cmd );

		}

	}

}

export { SetSceneCommand };