Chris@18: /**
Chris@18:  * @file
Chris@18:  * Attaches the behaviors for the Layout Builder module.
Chris@18:  */
Chris@18: 
Chris@18: (($, Drupal) => {
Chris@18:   const { ajax, behaviors, debounce, announce, formatPlural } = Drupal;
Chris@18: 
Chris@18:   /*
Chris@18:    * Boolean that tracks if block listing is currently being filtered. Declared
Chris@18:    * outside of behaviors so value is retained on rebuild.
Chris@18:    */
Chris@18:   let layoutBuilderBlocksFiltered = false;
Chris@18: 
Chris@18:   /**
Chris@18:    * Provides the ability to filter the block listing in Add Block dialog.
Chris@18:    *
Chris@18:    * @type {Drupal~behavior}
Chris@18:    *
Chris@18:    * @prop {Drupal~behaviorAttach} attach
Chris@18:    *   Attach block filtering behavior to Add Block dialog.
Chris@18:    */
Chris@18:   behaviors.layoutBuilderBlockFilter = {
Chris@18:     attach(context) {
Chris@18:       const $categories = $('.js-layout-builder-categories', context);
Chris@18:       const $filterLinks = $categories.find('.js-layout-builder-block-link');
Chris@18: 
Chris@18:       /**
Chris@18:        * Filters the block list.
Chris@18:        *
Chris@18:        * @param {jQuery.Event} e
Chris@18:        *   The jQuery event for the keyup event that triggered the filter.
Chris@18:        */
Chris@18:       const filterBlockList = e => {
Chris@18:         const query = $(e.target)
Chris@18:           .val()
Chris@18:           .toLowerCase();
Chris@18: 
Chris@18:         /**
Chris@18:          * Shows or hides the block entry based on the query.
Chris@18:          *
Chris@18:          * @param {number} index
Chris@18:          *   The index in the loop, as provided by `jQuery.each`
Chris@18:          * @param {HTMLElement} link
Chris@18:          *   The link to add the block.
Chris@18:          */
Chris@18:         const toggleBlockEntry = (index, link) => {
Chris@18:           const $link = $(link);
Chris@18:           const textMatch =
Chris@18:             $link
Chris@18:               .text()
Chris@18:               .toLowerCase()
Chris@18:               .indexOf(query) !== -1;
Chris@18:           $link.toggle(textMatch);
Chris@18:         };
Chris@18: 
Chris@18:         // Filter if the length of the query is at least 2 characters.
Chris@18:         if (query.length >= 2) {
Chris@18:           // Attribute to note which categories are closed before opening all.
Chris@18:           $categories
Chris@18:             .find('.js-layout-builder-category:not([open])')
Chris@18:             .attr('remember-closed', '');
Chris@18: 
Chris@18:           // Open all categories so every block is available to filtering.
Chris@18:           $categories.find('.js-layout-builder-category').attr('open', '');
Chris@18:           // Toggle visibility of links based on query.
Chris@18:           $filterLinks.each(toggleBlockEntry);
Chris@18: 
Chris@18:           // Only display categories containing visible links.
Chris@18:           $categories
Chris@18:             .find(
Chris@18:               '.js-layout-builder-category:not(:has(.js-layout-builder-block-link:visible))',
Chris@18:             )
Chris@18:             .hide();
Chris@18: 
Chris@18:           announce(
Chris@18:             formatPlural(
Chris@18:               $categories.find('.js-layout-builder-block-link:visible').length,
Chris@18:               '1 block is available in the modified list.',
Chris@18:               '@count blocks are available in the modified list.',
Chris@18:             ),
Chris@18:           );
Chris@18:           layoutBuilderBlocksFiltered = true;
Chris@18:         } else if (layoutBuilderBlocksFiltered) {
Chris@18:           layoutBuilderBlocksFiltered = false;
Chris@18:           // Remove "open" attr from categories that were closed pre-filtering.
Chris@18:           $categories
Chris@18:             .find('.js-layout-builder-category[remember-closed]')
Chris@18:             .removeAttr('open')
Chris@18:             .removeAttr('remember-closed');
Chris@18:           $categories.find('.js-layout-builder-category').show();
Chris@18:           $filterLinks.show();
Chris@18:           announce(Drupal.t('All available blocks are listed.'));
Chris@18:         }
Chris@18:       };
Chris@18: 
Chris@18:       $('input.js-layout-builder-filter', context)
Chris@18:         .once('block-filter-text')
Chris@18:         .on('keyup', debounce(filterBlockList, 200));
Chris@18:     },
Chris@18:   };
Chris@18: 
Chris@18:   /**
Chris@18:    * Provides the ability to drag blocks to new positions in the layout.
Chris@18:    *
Chris@18:    * @type {Drupal~behavior}
Chris@18:    *
Chris@18:    * @prop {Drupal~behaviorAttach} attach
Chris@18:    *   Attach block drag behavior to the Layout Builder UI.
Chris@18:    */
Chris@18:   behaviors.layoutBuilderBlockDrag = {
Chris@14:     attach(context) {
Chris@17:       $(context)
Chris@18:         .find('.js-layout-builder-region')
Chris@17:         .sortable({
Chris@18:           items: '> .js-layout-builder-block',
Chris@18:           connectWith: '.js-layout-builder-region',
Chris@17:           placeholder: 'ui-state-drop',
Chris@14: 
Chris@17:           /**
Chris@17:            * Updates the layout with the new position of the block.
Chris@17:            *
Chris@17:            * @param {jQuery.Event} event
Chris@17:            *   The jQuery Event object.
Chris@17:            * @param {Object} ui
Chris@17:            *   An object containing information about the item being sorted.
Chris@17:            */
Chris@17:           update(event, ui) {
Chris@17:             // Check if the region from the event and region for the item match.
Chris@18:             const itemRegion = ui.item.closest('.js-layout-builder-region');
Chris@17:             if (event.target === itemRegion[0]) {
Chris@17:               // Find the destination delta.
Chris@17:               const deltaTo = ui.item
Chris@17:                 .closest('[data-layout-delta]')
Chris@17:                 .data('layout-delta');
Chris@17:               // If the block didn't leave the original delta use the destination.
Chris@17:               const deltaFrom = ui.sender
Chris@17:                 ? ui.sender.closest('[data-layout-delta]').data('layout-delta')
Chris@17:                 : deltaTo;
Chris@17:               ajax({
Chris@17:                 url: [
Chris@17:                   ui.item
Chris@17:                     .closest('[data-layout-update-url]')
Chris@17:                     .data('layout-update-url'),
Chris@17:                   deltaFrom,
Chris@17:                   deltaTo,
Chris@17:                   itemRegion.data('region'),
Chris@17:                   ui.item.data('layout-block-uuid'),
Chris@17:                   ui.item
Chris@17:                     .prev('[data-layout-block-uuid]')
Chris@17:                     .data('layout-block-uuid'),
Chris@17:                 ]
Chris@17:                   .filter(element => element !== undefined)
Chris@17:                   .join('/'),
Chris@17:               }).execute();
Chris@17:             }
Chris@17:           },
Chris@17:         });
Chris@14:     },
Chris@14:   };
Chris@18: 
Chris@18:   /**
Chris@18:    * Disables interactive elements in previewed blocks.
Chris@18:    *
Chris@18:    * @type {Drupal~behavior}
Chris@18:    *
Chris@18:    * @prop {Drupal~behaviorAttach} attach
Chris@18:    *   Attach disabling interactive elements behavior to the Layout Builder UI.
Chris@18:    */
Chris@18:   behaviors.layoutBuilderDisableInteractiveElements = {
Chris@18:     attach() {
Chris@18:       // Disable interactive elements inside preview blocks.
Chris@18:       const $blocks = $('#layout-builder [data-layout-block-uuid]');
Chris@18:       $blocks.find('input, textarea, select').prop('disabled', true);
Chris@18:       $blocks
Chris@18:         .find('a')
Chris@18:         // Don't disable contextual links.
Chris@18:         // @see \Drupal\contextual\Element\ContextualLinksPlaceholder
Chris@18:         .not(
Chris@18:           (index, element) =>
Chris@18:             $(element).closest('[data-contextual-id]').length > 0,
Chris@18:         )
Chris@18:         .on('click mouseup touchstart', e => {
Chris@18:           e.preventDefault();
Chris@18:           e.stopPropagation();
Chris@18:         });
Chris@18: 
Chris@18:       /*
Chris@18:        * In preview blocks, remove from the tabbing order all input elements
Chris@18:        * and elements specifically assigned a tab index, other than those
Chris@18:        * related to contextual links.
Chris@18:        */
Chris@18:       $blocks
Chris@18:         .find(
Chris@18:           'button, [href], input, select, textarea, iframe, [tabindex]:not([tabindex="-1"]):not(.tabbable)',
Chris@18:         )
Chris@18:         .not(
Chris@18:           (index, element) =>
Chris@18:             $(element).closest('[data-contextual-id]').length > 0,
Chris@18:         )
Chris@18:         .attr('tabindex', -1);
Chris@18:     },
Chris@18:   };
Chris@18: 
Chris@18:   // After a dialog opens, highlight element that the dialog is acting on.
Chris@18:   $(window).on('dialog:aftercreate', (event, dialog, $element) => {
Chris@18:     if (Drupal.offCanvas.isOffCanvas($element)) {
Chris@18:       // Start by removing any existing highlighted elements.
Chris@18:       $('.is-layout-builder-highlighted').removeClass(
Chris@18:         'is-layout-builder-highlighted',
Chris@18:       );
Chris@18: 
Chris@18:       /*
Chris@18:        * Every dialog has a single 'data-layout-builder-target-highlight-id'
Chris@18:        * attribute. Every dialog-opening element has a unique
Chris@18:        * 'data-layout-builder-highlight-id' attribute.
Chris@18:        *
Chris@18:        * When the value of data-layout-builder-target-highlight-id matches
Chris@18:        * an element's value of data-layout-builder-highlight-id, the class
Chris@18:        * 'is-layout-builder-highlighted' is added to element.
Chris@18:        */
Chris@18:       const id = $element
Chris@18:         .find('[data-layout-builder-target-highlight-id]')
Chris@18:         .attr('data-layout-builder-target-highlight-id');
Chris@18:       if (id) {
Chris@18:         $(`[data-layout-builder-highlight-id="${id}"]`).addClass(
Chris@18:           'is-layout-builder-highlighted',
Chris@18:         );
Chris@18:       }
Chris@18: 
Chris@18:       // Remove wrapper class added by move block form.
Chris@18:       $('#layout-builder').removeClass('layout-builder--move-blocks-active');
Chris@18: 
Chris@18:       /**
Chris@18:        * If dialog has a data-add-layout-builder-wrapper attribute, get the
Chris@18:        * value and add it as a class to the Layout Builder UI wrapper.
Chris@18:        *
Chris@18:        * Currently, only the move block form uses
Chris@18:        * data-add-layout-builder-wrapper, but any dialog can use this attribute
Chris@18:        * to add a class to the Layout Builder UI while opened.
Chris@18:        */
Chris@18:       const layoutBuilderWrapperValue = $element
Chris@18:         .find('[data-add-layout-builder-wrapper]')
Chris@18:         .attr('data-add-layout-builder-wrapper');
Chris@18:       if (layoutBuilderWrapperValue) {
Chris@18:         $('#layout-builder').addClass(layoutBuilderWrapperValue);
Chris@18:       }
Chris@18:     }
Chris@18:   });
Chris@18: 
Chris@18:   /*
Chris@18:    * When a Layout Builder dialog is triggered, the main canvas resizes. After
Chris@18:    * the resize transition is complete, see if the target element is still
Chris@18:    * visible in viewport. If not, scroll page so the target element is again
Chris@18:    * visible.
Chris@18:    *
Chris@18:    * @todo Replace this custom solution when a general solution is made
Chris@18:    *   available with https://www.drupal.org/node/3033410
Chris@18:    */
Chris@18:   if (document.querySelector('[data-off-canvas-main-canvas]')) {
Chris@18:     const mainCanvas = document.querySelector('[data-off-canvas-main-canvas]');
Chris@18: 
Chris@18:     // This event fires when canvas CSS transitions are complete.
Chris@18:     mainCanvas.addEventListener('transitionend', () => {
Chris@18:       const $target = $('.is-layout-builder-highlighted');
Chris@18: 
Chris@18:       if ($target.length > 0) {
Chris@18:         // These four variables are used to determine if the element is in the
Chris@18:         // viewport.
Chris@18:         const targetTop = $target.offset().top;
Chris@18:         const targetBottom = targetTop + $target.outerHeight();
Chris@18:         const viewportTop = $(window).scrollTop();
Chris@18:         const viewportBottom = viewportTop + $(window).height();
Chris@18: 
Chris@18:         // If the element is not in the viewport, scroll it into view.
Chris@18:         if (targetBottom < viewportTop || targetTop > viewportBottom) {
Chris@18:           const viewportMiddle = (viewportBottom + viewportTop) / 2;
Chris@18:           const scrollAmount = targetTop - viewportMiddle;
Chris@18: 
Chris@18:           // Check whether the browser supports scrollBy(options). If it does
Chris@18:           // not, use scrollBy(x-coord, y-coord) instead.
Chris@18:           if ('scrollBehavior' in document.documentElement.style) {
Chris@18:             window.scrollBy({
Chris@18:               top: scrollAmount,
Chris@18:               left: 0,
Chris@18:               behavior: 'smooth',
Chris@18:             });
Chris@18:           } else {
Chris@18:             window.scrollBy(0, scrollAmount);
Chris@18:           }
Chris@18:         }
Chris@18:       }
Chris@18:     });
Chris@18:   }
Chris@18: 
Chris@18:   $(window).on('dialog:afterclose', (event, dialog, $element) => {
Chris@18:     if (Drupal.offCanvas.isOffCanvas($element)) {
Chris@18:       // Remove the highlight from all elements.
Chris@18:       $('.is-layout-builder-highlighted').removeClass(
Chris@18:         'is-layout-builder-highlighted',
Chris@18:       );
Chris@18: 
Chris@18:       // Remove wrapper class added by move block form.
Chris@18:       $('#layout-builder').removeClass('layout-builder--move-blocks-active');
Chris@18:     }
Chris@18:   });
Chris@18: 
Chris@18:   /**
Chris@18:    * Toggles content preview in the Layout Builder UI.
Chris@18:    *
Chris@18:    * @type {Drupal~behavior}
Chris@18:    *
Chris@18:    * @prop {Drupal~behaviorAttach} attach
Chris@18:    *   Attach content preview toggle to the Layout Builder UI.
Chris@18:    */
Chris@18:   behaviors.layoutBuilderToggleContentPreview = {
Chris@18:     attach(context) {
Chris@18:       const $layoutBuilder = $('#layout-builder');
Chris@18: 
Chris@18:       // The content preview toggle.
Chris@18:       const $layoutBuilderContentPreview = $('#layout-builder-content-preview');
Chris@18: 
Chris@18:       // data-content-preview-id specifies the layout being edited.
Chris@18:       const contentPreviewId = $layoutBuilderContentPreview.data(
Chris@18:         'content-preview-id',
Chris@18:       );
Chris@18: 
Chris@18:       /**
Chris@18:        * Tracks if content preview is enabled for this layout. Defaults to true
Chris@18:        * if no value has previously been set.
Chris@18:        */
Chris@18:       const isContentPreview =
Chris@18:         JSON.parse(localStorage.getItem(contentPreviewId)) !== false;
Chris@18: 
Chris@18:       /**
Chris@18:        * Disables content preview in the Layout Builder UI.
Chris@18:        *
Chris@18:        * Disabling content preview hides block content. It is replaced with the
Chris@18:        * value of the block's data-layout-content-preview-placeholder-label
Chris@18:        * attribute.
Chris@18:        *
Chris@18:        * @todo Revisit in https://www.drupal.org/node/3043215, it may be
Chris@18:        *   possible to remove all but the first line of this function.
Chris@18:        */
Chris@18:       const disableContentPreview = () => {
Chris@18:         $layoutBuilder.addClass('layout-builder--content-preview-disabled');
Chris@18: 
Chris@18:         /**
Chris@18:          * Iterate over all Layout Builder blocks to hide their content and add
Chris@18:          * placeholder labels.
Chris@18:          */
Chris@18:         $('[data-layout-content-preview-placeholder-label]', context).each(
Chris@18:           (i, element) => {
Chris@18:             const $element = $(element);
Chris@18: 
Chris@18:             // Hide everything in block that isn't contextual link related.
Chris@18:             $element.children(':not([data-contextual-id])').hide(0);
Chris@18: 
Chris@18:             const contentPreviewPlaceholderText = $element.attr(
Chris@18:               'data-layout-content-preview-placeholder-label',
Chris@18:             );
Chris@18: 
Chris@18:             const contentPreviewPlaceholderLabel = Drupal.theme(
Chris@18:               'layoutBuilderPrependContentPreviewPlaceholderLabel',
Chris@18:               contentPreviewPlaceholderText,
Chris@18:             );
Chris@18:             $element.prepend(contentPreviewPlaceholderLabel);
Chris@18:           },
Chris@18:         );
Chris@18:       };
Chris@18: 
Chris@18:       /**
Chris@18:        * Enables content preview in the Layout Builder UI.
Chris@18:        *
Chris@18:        * When content preview is enabled, the Layout Builder UI returns to its
Chris@18:        * default experience. This is accomplished by removing placeholder
Chris@18:        * labels and un-hiding block content.
Chris@18:        *
Chris@18:        * @todo Revisit in https://www.drupal.org/node/3043215, it may be
Chris@18:        *   possible to remove all but the first line of this function.
Chris@18:        */
Chris@18:       const enableContentPreview = () => {
Chris@18:         $layoutBuilder.removeClass('layout-builder--content-preview-disabled');
Chris@18: 
Chris@18:         // Remove all placeholder labels.
Chris@18:         $('.js-layout-builder-content-preview-placeholder-label').remove();
Chris@18: 
Chris@18:         // Iterate over all blocks.
Chris@18:         $('[data-layout-content-preview-placeholder-label]').each(
Chris@18:           (i, element) => {
Chris@18:             $(element)
Chris@18:               .children()
Chris@18:               .show();
Chris@18:           },
Chris@18:         );
Chris@18:       };
Chris@18: 
Chris@18:       $('#layout-builder-content-preview', context).on('change', event => {
Chris@18:         const isChecked = $(event.currentTarget).is(':checked');
Chris@18: 
Chris@18:         localStorage.setItem(contentPreviewId, JSON.stringify(isChecked));
Chris@18: 
Chris@18:         if (isChecked) {
Chris@18:           enableContentPreview();
Chris@18:           announce(
Chris@18:             Drupal.t('Block previews are visible. Block labels are hidden.'),
Chris@18:           );
Chris@18:         } else {
Chris@18:           disableContentPreview();
Chris@18:           announce(
Chris@18:             Drupal.t('Block previews are hidden. Block labels are visible.'),
Chris@18:           );
Chris@18:         }
Chris@18:       });
Chris@18: 
Chris@18:       /**
Chris@18:        * On rebuild, see if content preview has been set to disabled. If yes,
Chris@18:        * disable content preview in the Layout Builder UI.
Chris@18:        */
Chris@18:       if (!isContentPreview) {
Chris@18:         $layoutBuilderContentPreview.attr('checked', false);
Chris@18:         disableContentPreview();
Chris@18:       }
Chris@18:     },
Chris@18:   };
Chris@18: 
Chris@18:   /**
Chris@18:    * Creates content preview placeholder label markup.
Chris@18:    *
Chris@18:    * @param {string} contentPreviewPlaceholderText
Chris@18:    *   The text content of the placeholder label
Chris@18:    *
Chris@18:    * @return {string}
Chris@18:    *   A HTML string of the placeholder label.
Chris@18:    */
Chris@18:   Drupal.theme.layoutBuilderPrependContentPreviewPlaceholderLabel = contentPreviewPlaceholderText => {
Chris@18:     const contentPreviewPlaceholderLabel = document.createElement('div');
Chris@18:     contentPreviewPlaceholderLabel.className =
Chris@18:       'layout-builder-block__content-preview-placeholder-label js-layout-builder-content-preview-placeholder-label';
Chris@18:     contentPreviewPlaceholderLabel.innerHTML = contentPreviewPlaceholderText;
Chris@18: 
Chris@18:     return `<div class="layout-builder-block__content-preview-placeholder-label js-layout-builder-content-preview-placeholder-label">${contentPreviewPlaceholderText}</div>`;
Chris@18:   };
Chris@14: })(jQuery, Drupal);