327 lines
11 KiB
JavaScript
327 lines
11 KiB
JavaScript
/* global tinymce, switchEditors */
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/* eslint consistent-this: [ "error", "control" ] */
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wp.textWidgets = ( function( $ ) {
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'use strict';
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var component = {};
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/**
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* Text widget control.
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*
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* @class TextWidgetControl
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* @constructor
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* @abstract
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*/
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component.TextWidgetControl = Backbone.View.extend({
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/**
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* View events.
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*
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* @type {Object}
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*/
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events: {},
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/**
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* Initialize.
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*
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* @param {Object} options - Options.
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* @param {Backbone.Model} options.model - Model.
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* @param {jQuery} options.el - Control container element.
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* @returns {void}
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*/
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initialize: function initialize( options ) {
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var control = this;
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if ( ! options.el ) {
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throw new Error( 'Missing options.el' );
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}
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Backbone.View.prototype.initialize.call( control, options );
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/*
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* Create a container element for the widget control fields.
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* This is inserted into the DOM immediately before the the .widget-content
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* element because the contents of this element are essentially "managed"
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* by PHP, where each widget update cause the entire element to be emptied
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* and replaced with the rendered output of WP_Widget::form() which is
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* sent back in Ajax request made to save/update the widget instance.
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* To prevent a "flash of replaced DOM elements and re-initialized JS
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* components", the JS template is rendered outside of the normal form
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* container.
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*/
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control.fieldContainer = $( '<div class="text-widget-fields"></div>' );
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control.fieldContainer.html( wp.template( 'widget-text-control-fields' ) );
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control.widgetContentContainer = control.$el.find( '.widget-content:first' );
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control.widgetContentContainer.before( control.fieldContainer );
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control.fields = {
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title: control.fieldContainer.find( '.title' ),
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text: control.fieldContainer.find( '.text' )
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};
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// Sync input fields to hidden sync fields which actually get sent to the server.
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_.each( control.fields, function( fieldInput, fieldName ) {
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fieldInput.on( 'input change', function updateSyncField() {
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var syncInput = control.widgetContentContainer.find( 'input[type=hidden].' + fieldName );
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if ( syncInput.val() !== $( this ).val() ) {
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syncInput.val( $( this ).val() );
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syncInput.trigger( 'change' );
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}
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});
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// Note that syncInput cannot be re-used because it will be destroyed with each widget-updated event.
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fieldInput.val( control.widgetContentContainer.find( 'input[type=hidden].' + fieldName ).val() );
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});
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},
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/**
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* Update input fields from the sync fields.
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*
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* This function is called at the widget-updated and widget-synced events.
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* A field will only be updated if it is not currently focused, to avoid
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* overwriting content that the user is entering.
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*
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* @returns {void}
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*/
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updateFields: function updateFields() {
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var control = this, syncInput;
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if ( ! control.fields.title.is( document.activeElement ) ) {
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syncInput = control.widgetContentContainer.find( 'input[type=hidden].title' );
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control.fields.title.val( syncInput.val() );
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}
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syncInput = control.widgetContentContainer.find( 'input[type=hidden].text' );
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if ( control.fields.text.is( ':visible' ) ) {
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if ( ! control.fields.text.is( document.activeElement ) ) {
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control.fields.text.val( syncInput.val() );
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}
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} else if ( control.editor && ! control.editorFocused && syncInput.val() !== control.fields.text.val() ) {
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control.editor.setContent( wp.editor.autop( syncInput.val() ) );
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}
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},
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/**
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* Initialize editor.
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*
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* @returns {void}
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*/
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initializeEditor: function initializeEditor() {
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var control = this, changeDebounceDelay = 1000, id, textarea, restoreTextMode = false;
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textarea = control.fields.text;
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id = textarea.attr( 'id' );
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/**
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* Build (or re-build) the visual editor.
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*
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* @returns {void}
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*/
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function buildEditor() {
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var editor, triggerChangeIfDirty, onInit;
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// Abort building if the textarea is gone, likely due to the widget having been deleted entirely.
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if ( ! document.getElementById( id ) ) {
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return;
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}
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// Destroy any existing editor so that it can be re-initialized after a widget-updated event.
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if ( tinymce.get( id ) ) {
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restoreTextMode = tinymce.get( id ).isHidden();
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wp.editor.remove( id );
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}
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wp.editor.initialize( id, {
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tinymce: {
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wpautop: true
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},
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quicktags: true
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});
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editor = window.tinymce.get( id );
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if ( ! editor ) {
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throw new Error( 'Failed to initialize editor' );
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}
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onInit = function() {
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// When a widget is moved in the DOM the dynamically-created TinyMCE iframe will be destroyed and has to be re-built.
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$( editor.getWin() ).on( 'unload', function() {
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_.defer( buildEditor );
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});
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// If a prior mce instance was replaced, and it was in text mode, toggle to text mode.
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if ( restoreTextMode ) {
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switchEditors.go( id, 'toggle' );
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}
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};
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if ( editor.initialized ) {
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onInit();
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} else {
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editor.on( 'init', onInit );
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}
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control.editorFocused = false;
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triggerChangeIfDirty = function() {
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var updateWidgetBuffer = 300; // See wp.customize.Widgets.WidgetControl._setupUpdateUI() which uses 250ms for updateWidgetDebounced.
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if ( editor.isDirty() ) {
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/*
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* Account for race condition in customizer where user clicks Save & Publish while
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* focus was just previously given to to the editor. Since updates to the editor
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* are debounced at 1 second and since widget input changes are only synced to
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* settings after 250ms, the customizer needs to be put into the processing
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* state during the time between the change event is triggered and updateWidget
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* logic starts. Note that the debounced update-widget request should be able
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* to be removed with the removal of the update-widget request entirely once
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* widgets are able to mutate their own instance props directly in JS without
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* having to make server round-trips to call the respective WP_Widget::update()
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* callbacks. See <https://core.trac.wordpress.org/ticket/33507>.
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*/
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if ( wp.customize ) {
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wp.customize.state( 'processing' ).set( wp.customize.state( 'processing' ).get() + 1 );
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_.delay( function() {
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wp.customize.state( 'processing' ).set( wp.customize.state( 'processing' ).get() - 1 );
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}, updateWidgetBuffer );
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}
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editor.save();
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textarea.trigger( 'change' );
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}
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};
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editor.on( 'focus', function() {
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control.editorFocused = true;
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});
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editor.on( 'NodeChange', _.debounce( triggerChangeIfDirty, changeDebounceDelay ) );
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editor.on( 'blur', function() {
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control.editorFocused = false;
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triggerChangeIfDirty();
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});
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control.editor = editor;
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}
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buildEditor();
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}
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});
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/**
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* Mapping of widget ID to instances of TextWidgetControl subclasses.
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*
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* @type {Object.<string, wp.textWidgets.TextWidgetControl>}
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*/
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component.widgetControls = {};
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/**
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* Handle widget being added or initialized for the first time at the widget-added event.
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*
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* @param {jQuery.Event} event - Event.
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* @param {jQuery} widgetContainer - Widget container element.
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* @returns {void}
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*/
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component.handleWidgetAdded = function handleWidgetAdded( event, widgetContainer ) {
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var widgetForm, idBase, widgetControl, widgetId, animatedCheckDelay = 50, widgetInside, renderWhenAnimationDone;
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widgetForm = widgetContainer.find( '> .widget-inside > .form, > .widget-inside > form' ); // Note: '.form' appears in the customizer, whereas 'form' on the widgets admin screen.
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idBase = widgetForm.find( '> .id_base' ).val();
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if ( 'text' !== idBase ) {
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return;
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}
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// Prevent initializing already-added widgets.
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widgetId = widgetForm.find( '> .widget-id' ).val();
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if ( component.widgetControls[ widgetId ] ) {
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return;
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}
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widgetControl = new component.TextWidgetControl({
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el: widgetContainer
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});
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component.widgetControls[ widgetId ] = widgetControl;
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/*
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* Render the widget once the widget parent's container finishes animating,
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* as the widget-added event fires with a slideDown of the container.
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* This ensures that the textarea is visible and an iframe can be embedded
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* with TinyMCE being able to set contenteditable on it.
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*/
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widgetInside = widgetContainer.parent();
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renderWhenAnimationDone = function() {
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if ( widgetInside.is( ':animated' ) ) {
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setTimeout( renderWhenAnimationDone, animatedCheckDelay );
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} else {
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widgetControl.initializeEditor();
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}
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};
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renderWhenAnimationDone();
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};
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/**
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* Sync widget instance data sanitized from server back onto widget model.
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*
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* This gets called via the 'widget-updated' event when saving a widget from
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* the widgets admin screen and also via the 'widget-synced' event when making
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* a change to a widget in the customizer.
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*
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* @param {jQuery.Event} event - Event.
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* @param {jQuery} widgetContainer - Widget container element.
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* @returns {void}
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*/
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component.handleWidgetUpdated = function handleWidgetUpdated( event, widgetContainer ) {
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var widgetForm, widgetId, widgetControl, idBase;
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widgetForm = widgetContainer.find( '> .widget-inside > .form, > .widget-inside > form' );
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idBase = widgetForm.find( '> .id_base' ).val();
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if ( 'text' !== idBase ) {
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return;
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}
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widgetId = widgetForm.find( '> .widget-id' ).val();
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widgetControl = component.widgetControls[ widgetId ];
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if ( ! widgetControl ) {
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return;
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}
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widgetControl.updateFields();
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};
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/**
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* Initialize functionality.
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*
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* This function exists to prevent the JS file from having to boot itself.
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* When WordPress enqueues this script, it should have an inline script
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* attached which calls wp.textWidgets.init().
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*
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* @returns {void}
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*/
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component.init = function init() {
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var $document = $( document );
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$document.on( 'widget-added', component.handleWidgetAdded );
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$document.on( 'widget-synced widget-updated', component.handleWidgetUpdated );
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/*
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* Manually trigger widget-added events for media widgets on the admin
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* screen once they are expanded. The widget-added event is not triggered
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* for each pre-existing widget on the widgets admin screen like it is
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* on the customizer. Likewise, the customizer only triggers widget-added
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* when the widget is expanded to just-in-time construct the widget form
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* when it is actually going to be displayed. So the following implements
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* the same for the widgets admin screen, to invoke the widget-added
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* handler when a pre-existing media widget is expanded.
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*/
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$( function initializeExistingWidgetContainers() {
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var widgetContainers;
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if ( 'widgets' !== window.pagenow ) {
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return;
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}
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widgetContainers = $( '.widgets-holder-wrap:not(#available-widgets)' ).find( 'div.widget' );
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widgetContainers.one( 'click.toggle-widget-expanded', function toggleWidgetExpanded() {
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var widgetContainer = $( this );
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component.handleWidgetAdded( new jQuery.Event( 'widget-added' ), widgetContainer );
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});
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});
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};
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return component;
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})( jQuery );
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