deleteobserver.js 1.5 KB

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  1. /**
  2. * @license Copyright (c) 2003-2016, CKSource - Frederico Knabben. All rights reserved.
  3. * For licensing, see LICENSE.md.
  4. */
  5. import Observer from '../engine/view/observer/observer.js';
  6. import DomEventData from '../engine/view/observer/domeventdata.js';
  7. import { keyCodes } from '../utils/keyboard.js';
  8. /**
  9. * Delete observer introduces the {@link engine.view.Document#delete} event.
  10. *
  11. * @memberOf typing
  12. * @extends engine.view.observer.Observer
  13. */
  14. export default class DeleteObserver extends Observer {
  15. constructor( document ) {
  16. super( document );
  17. document.on( 'keydown', ( evt, data ) => {
  18. const deleteData = {};
  19. if ( data.keyCode == keyCodes.delete ) {
  20. deleteData.direction = 'forward';
  21. } else if ( data.keyCode == keyCodes.backspace ) {
  22. deleteData.direction = 'backward';
  23. } else {
  24. return;
  25. }
  26. deleteData.unit = data.altKey ? 'word' : 'character';
  27. document.fire( 'delete', new DomEventData( document, data.domEvent, deleteData ) );
  28. } );
  29. }
  30. /**
  31. * @inheritDoc
  32. */
  33. observe() {}
  34. }
  35. /**
  36. * Event fired when the user tries to delete content (e.g. presses <kbd>Delete</kbd> or <kbd>Backspace</kbd>).
  37. *
  38. * Note: This event is fired by the {@link typing.DeleteObserver observer}
  39. * (usually registered by the {@link typing.Delete delete feature}).
  40. *
  41. * @event engine.view.Document#delete
  42. * @param {engine.view.observer.DomEventData} data
  43. * @param {'forward'|'delete'} data.direction The direction in which the deletion should happen.
  44. * @param {'character'|'word'} data.unit The "amount" of content that should be deleted.
  45. */