src/view/observer/focusobserver.js
/**
* @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.
* For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
*/
/**
* @module engine/view/observer/focusobserver
*/
/* globals setTimeout, clearTimeout */
import DomEventObserver from './domeventobserver';
/**
* {@link module:engine/view/document~Document#event:focus Focus}
* and {@link module:engine/view/document~Document#event:blur blur} events observer.
* Focus observer handle also {@link module:engine/view/rooteditableelement~RootEditableElement#isFocused isFocused} property of the
* {@link module:engine/view/rooteditableelement~RootEditableElement root elements}.
*
* Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.
*
* @extends module:engine/view/observer/domeventobserver~DomEventObserver
*/
export default class FocusObserver extends DomEventObserver {
constructor( view ) {
super( view );
this.domEventType = [ 'focus', 'blur' ];
this.useCapture = true;
const document = this.document;
document.on( 'focus', () => {
document.isFocused = true;
// Unfortunately native `selectionchange` event is fired asynchronously.
// We need to wait until `SelectionObserver` handle the event and then render. Otherwise rendering will
// overwrite new DOM selection with selection from the view.
// See https://github.com/ckeditor/ckeditor5-engine/issues/795 for more details.
// Long timeout is needed to solve #676 and https://github.com/ckeditor/ckeditor5-engine/issues/1157 issues.
this._renderTimeoutId = setTimeout( () => view.forceRender(), 50 );
} );
document.on( 'blur', ( evt, data ) => {
const selectedEditable = document.selection.editableElement;
if ( selectedEditable === null || selectedEditable === data.target ) {
document.isFocused = false;
// Re-render the document to update view elements.
view.forceRender();
}
} );
/**
* Identifier of the timeout currently used by focus listener to delay rendering execution.
*
* @private
* @member {Number} #_renderTimeoutId
*/
}
onDomEvent( domEvent ) {
this.fire( domEvent.type, domEvent );
}
/**
* @inheritDoc
*/
destroy() {
if ( this._renderTimeoutId ) {
clearTimeout( this._renderTimeoutId );
}
super.destroy();
}
}
/**
* Fired when one of the editables gets focus.
*
* Introduced by {@link module:engine/view/observer/focusobserver~FocusObserver}.
*
* Note that because {@link module:engine/view/observer/focusobserver~FocusObserver} is attached by the
* {@link module:engine/view/view~View} this event is available by default.
*
* @see module:engine/view/observer/focusobserver~FocusObserver
* @event module:engine/view/document~Document#event:focus
* @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.
*/
/**
* Fired when one of the editables loses focus.
*
* Introduced by {@link module:engine/view/observer/focusobserver~FocusObserver}.
*
* Note that because {@link module:engine/view/observer/focusobserver~FocusObserver} is attached by the
* {@link module:engine/view/view~View} this event is available by default.
*
* @see module:engine/view/observer/focusobserver~FocusObserver
* @event module:engine/view/document~Document#event:blur
* @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.
*/