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- /**
- * @license Copyright (c) 2003-2016, CKSource - Frederico Knabben. All rights reserved.
- * For licensing, see LICENSE.md.
- */
- 'use strict';
- import Collection from '../collection.js';
- import Region from './region.js';
- import Template from './template.js';
- import CKEditorError from '../ckeditorerror.js';
- import DOMEmitterMixin from './domemittermixin.js';
- import utils from '../utils.js';
- /**
- * Basic View class.
- *
- * @class View
- * @mixins DOMEmitterMixin
- */
- export default class View {
- /**
- * Creates an instance of the {@link View} class.
- *
- * @param {Model} model (View)Model of this View.
- * @constructor
- */
- constructor( model ) {
- /**
- * Model of this view.
- *
- * @property {Model}
- */
- this.model = model || null;
- /**
- * Regions of this view. See {@link #register}.
- *
- * @property {Collection}
- */
- this.regions = new Collection( {
- idProperty: 'name'
- } );
- /**
- * Template of this view.
- *
- * @property {Object}
- */
- this.template = null;
- /**
- * Region selectors of this view. See {@link #register}.
- *
- * @private
- * @property {Object}
- */
- this._regionsSelectors = {};
- /**
- * Element of this view.
- *
- * @private
- * @property {HTMLElement}
- */
- this._element = null;
- /**
- * An instance of Template to generate {@link #_el}.
- *
- * @private
- * @property {Template}
- */
- this._template = null;
- }
- /**
- * Element of this view. The element is rendered on first reference
- * using {@link #template} definition and {@link #_template} object.
- *
- * @property element
- */
- get element() {
- if ( this._element ) {
- return this._element;
- }
- if ( !this.template ) {
- /**
- * Attempting to access an element of a view, which has no `template`
- * property.
- *
- * @error ui-view-notemplate
- */
- throw new CKEditorError( 'ui-view-notemplate' );
- }
- // Prepare pre–defined listeners.
- this._createTemplateListenerAttachers( this.template );
- this._template = new Template( this.template );
- return ( this._element = this._template.render() );
- }
- set element( el ) {
- this._element = el;
- }
- /**
- * Initializes the view.
- */
- init() {
- this._initRegions();
- }
- /**
- * Registers a region in {@link #regions}.
- *
- * let view = new View();
- *
- * // region.name == "foo", region.element == view.element.firstChild
- * view.register( 'foo', el => el.firstChild );
- *
- * // region.name == "bar", region.element == view.element.querySelector( 'span' )
- * view.register( new Region( 'bar' ), 'span' );
- *
- * // region.name == "bar", region.element == view.element.querySelector( '#div#id' )
- * view.register( 'bar', 'div#id', true );
- *
- * // region.name == "baz", region.element == null
- * view.register( 'baz', true );
- *
- * @param {String|Region} stringOrRegion The name or an instance of the Region
- * to be registered. If `String`, the region will be created on the fly.
- * @param {String|Function|true} regionSelector The selector to retrieve region's element
- * in DOM when the region instance is initialized (see {@link Region#init}, {@link #init}).
- * @param {Boolean} [override] When set `true` it will allow overriding of registered regions.
- */
- register( ...args ) {
- let region, regionName;
- if ( typeof args[ 0 ] === 'string' ) {
- regionName = args[ 0 ];
- region = this.regions.get( regionName ) || new Region( regionName );
- } else if ( args[ 0 ] instanceof Region ) {
- regionName = args[ 0 ].name;
- region = args[ 0 ];
- } else {
- /**
- * A name of the region or an instance of Region is required.
- *
- * @error ui-view-register-wrongtype
- */
- throw new CKEditorError( 'ui-view-register-wrongtype' );
- }
- const regionSelector = args[ 1 ];
- if ( !regionSelector || !isValidRegionSelector( regionSelector ) ) {
- /**
- * The selector must be String, Function or `true`.
- *
- * @error ui-view-register-badselector
- */
- throw new CKEditorError( 'ui-view-register-badselector' );
- }
- const registered = this.regions.get( regionName );
- if ( !registered ) {
- this.regions.add( region );
- } else {
- if ( registered !== region ) {
- if ( !args[ 2 ] ) {
- /**
- * Overriding is possible only when `override` flag is set.
- *
- * @error ui-view-register-override
- */
- throw new CKEditorError( 'ui-view-register-override' );
- }
- this.regions.remove( registered );
- this.regions.add( region );
- }
- }
- this._regionsSelectors[ regionName ] = regionSelector;
- }
- /**
- * Binds an `attribute` of View's model so the DOM of the View is updated when the `attribute`
- * changes. It returns a function which, once called in the context of a DOM element,
- * attaches a listener to the model which, in turn, brings changes to DOM.
- *
- * @param {String} attribute Attribute name in the model to be observed.
- * @param {Function} [callback] Callback function executed on attribute change in model.
- * If not specified, a default DOM `domUpdater` supplied by the template is used.
- */
- bindToAttribute( attribute, callback ) {
- /**
- * Attaches a listener to View's model, which updates DOM when the model's attribute
- * changes. DOM is either updated by the `domUpdater` function supplied by the template
- * (like attribute changer or `innerHTML` setter) or custom `callback` passed to {@link #bind}.
- *
- * This function is called by {@link Template#render}.
- *
- * @param {HTMLElement} el DOM element to be updated when `attribute` in model changes.
- * @param {Function} domUpdater A function provided by the template which updates corresponding
- * DOM.
- */
- return ( el, domUpdater ) => {
- let onModelChange;
- if ( callback ) {
- onModelChange = ( evt, value ) => {
- let processedValue = callback( el, value );
- if ( typeof processedValue != 'undefined' ) {
- domUpdater( el, processedValue );
- }
- };
- } else {
- onModelChange = ( evt, value ) => domUpdater( el, value );
- }
- // Execute callback when the attribute changes.
- this.listenTo( this.model, 'change:' + attribute, onModelChange );
- // Set the initial state of the view.
- onModelChange( null, this.model[ attribute ] );
- };
- }
- /**
- * Applies template to existing DOM element in the context of a View.
- *
- * const element = document.createElement( 'div' );
- * const view = new View( new Model( { divClass: 'my-div' } ) );
- *
- * view.applyTemplateToElement( element, {
- * attrs: {
- * id: 'first-div',
- * class: view.bindToAttribute( 'divClass' )
- * },
- * on: {
- * click: 'elementClicked' // Will be fired by the View instance.
- * }
- * children: [
- * 'Div text.'
- * ]
- * } );
- *
- * element.outerHTML == "<div id="first-div" class="my-div">Div text.</div>"
- *
- * See: {@link Template#apply}.
- *
- * @param {DOMElement} element DOM Element to initialize.
- * @param {TemplateDefinition} def Template definition to be applied.
- */
- applyTemplateToElement( element, def ) {
- this._createTemplateListenerAttachers( def );
- new Template( def ).apply( element );
- }
- /**
- * Destroys the view instance. The process includes:
- *
- * 1. Removal of child views from {@link #regions}.
- * 2. Destruction of the {@link #regions}.
- * 3. Removal of {#link #_el} from DOM.
- */
- destroy() {
- let childView;
- this.stopListening();
- for ( let region of this.regions ) {
- while ( ( childView = region.views.get( 0 ) ) ) {
- region.views.remove( childView );
- }
- this.regions.remove( region ).destroy();
- }
- if ( this.template ) {
- this.element.remove();
- }
- this.model = this.regions = this.template = this._regionsSelectors = this._element = this._template = null;
- }
- /**
- * Initializes {@link #regions} of this view by passing a DOM element
- * generated from {@link #_regionsSelectors} into {@link Region#init}.
- *
- * @protected
- */
- _initRegions() {
- let region, regionEl, regionSelector;
- for ( region of this.regions ) {
- regionSelector = this._regionsSelectors[ region.name ];
- if ( typeof regionSelector == 'string' ) {
- regionEl = this.element.querySelector( regionSelector );
- } else if ( typeof regionSelector == 'function' ) {
- regionEl = regionSelector( this.element );
- } else {
- regionEl = null;
- }
- region.init( regionEl );
- }
- }
- /**
- * For a given event name or callback, returns a function which,
- * once executed in a context of an element, attaches native DOM listener
- * to the element. The listener executes given callback or fires View's event
- * of given name.
- *
- * @protected
- * @param {String|Function} evtNameOrCallback Event name to be fired on View or callback to execute.
- * @returns {Function} A listener attacher function to be executed in the context of an element.
- */
- _getDOMListenerAttacher( evtNameOrCallback ) {
- /**
- * Attaches a native DOM listener to given element. The listener executes the
- * callback or fires View's event.
- *
- * Note: If the selector is supplied, it narrows the scope to relevant targets only.
- * So instead of
- *
- * children: [
- * { tag: 'span', on: { click: 'foo' } }
- * { tag: 'span', on: { click: 'foo' } }
- * ]
- *
- * a single, more efficient listener can be attached that uses **event delegation**:
- *
- * children: [
- * { tag: 'span' }
- * { tag: 'span' }
- * ],
- * on: {
- * 'click@span': 'foo',
- * }
- *
- * @param {HTMLElement} el Element, to which the native DOM Event listener is attached.
- * @param {String} domEventName The name of native DOM Event.
- * @param {String} [selector] If provided, the selector narrows the scope to relevant targets only.
- */
- return ( el, domEvtName, selector ) => {
- // Use View's listenTo, so the listener is detached, when the View dies.
- this.listenTo( el, domEvtName, ( evt, domEvt ) => {
- if ( !selector || domEvt.target.matches( selector ) ) {
- if ( typeof evtNameOrCallback == 'function' ) {
- evtNameOrCallback( domEvt );
- } else {
- this.fire( evtNameOrCallback, domEvt );
- }
- }
- } );
- };
- }
- /**
- * Iterates over "on" property in {@link TemplateDefinition} to recursively
- * replace each listener declaration with a function which, once executed in a context
- * of an element, attaches native DOM listener to that element.
- *
- * @protected
- * @param {TemplateDefinition} def Template definition.
- */
- _createTemplateListenerAttachers( def ) {
- const on = def.on;
- // Don't create attachers if they're already here or in the context of the same (this) View instance.
- if ( on && ( !on._listenerAttachers || on._listenerView != this ) ) {
- let domEvtName, evtNameOrCallback;
- Object.defineProperty( on, '_listenerAttachers', {
- enumerable: false,
- writable: true,
- value: {}
- } );
- for ( domEvtName in on ) {
- evtNameOrCallback = on[ domEvtName ];
- // Listeners allow definition with an array:
- //
- // on: {
- // 'DOMEventName@selector': [ 'event1', callback ],
- // 'DOMEventName': [ callback, 'event2', 'event3' ]
- // ...
- // }
- if ( Array.isArray( evtNameOrCallback ) ) {
- on._listenerAttachers[ domEvtName ] = on[ domEvtName ].map( this._getDOMListenerAttacher, this );
- }
- // Listeners allow definition with a string containing event name:
- //
- // on: {
- // 'DOMEventName@selector': 'event1',
- // 'DOMEventName': 'event2'
- // ...
- // }
- else {
- on._listenerAttachers[ domEvtName ] = this._getDOMListenerAttacher( evtNameOrCallback );
- }
- }
- // Set this property to be known that these attachers has already been created
- // in the context of this particular View instance.
- Object.defineProperty( on, '_listenerView', {
- enumerable: false,
- writable: true,
- value: this
- } );
- }
- // Repeat recursively for the children.
- if ( def.children ) {
- def.children.forEach( this._createTemplateListenerAttachers, this );
- }
- }
- }
- utils.mix( View, DOMEmitterMixin );
- const validSelectorTypes = new Set( [ 'string', 'boolean', 'function' ] );
- /**
- * Check whether region selector is valid.
- *
- * @private
- * @param {*} selector Selector to be checked.
- * @returns {Boolean}
- */
- function isValidRegionSelector( selector ) {
- return validSelectorTypes.has( typeof selector ) && selector !== false;
- }
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