/** * @license Copyright (c) 2003-2016, CKSource - Frederico Knabben. All rights reserved. * For licensing, see LICENSE.md. */ import Observer from '../engine/view/observer/observer.js'; import DomEventData from '../engine/view/observer/domeventdata.js'; import { keyCodes } from '../utils/keyboard.js'; /** * Delete observer introduces the {@link engine.view.Document#delete} event. * * @memberOf typing * @extends engine.view.observer.Observer */ export default class DeleteObserver extends Observer { constructor( document ) { super( document ); document.on( 'keydown', ( evt, data ) => { const deleteData = {}; if ( data.keyCode == keyCodes.delete ) { deleteData.direction = 'forward'; } else if ( data.keyCode == keyCodes.backspace ) { deleteData.direction = 'backward'; } else { return; } deleteData.unit = data.altKey ? 'word' : 'character'; document.fire( 'delete', new DomEventData( document, data.domEvent, deleteData ) ); } ); } /** * @inheritDoc */ observe() {} } /** * Event fired when the user tries to delete content (e.g. presses Delete or Backspace). * * Note: This event is fired by the {@link typing.DeleteObserver observer} * (usually registered by the {@link typing.Delete delete feature}). * * @event engine.view.Document#delete * @param {engine.view.observer.DomEventData} data * @param {'forward'|'delete'} data.direction The direction in which the deletion should happen. * @param {'character'|'word'} data.unit The "amount" of content that should be deleted. */