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Editing: plugin-fj-gallery.js

import $ from 'jquery';

// Extend VP class.
$( document ).on( 'extendClass.vpf', ( event, VP ) => {
	if ( event.namespace !== 'vpf' ) {
		return;
	}

/**
	 * Init fjGallery plugin
	 *
	 * @param {mixed} options    - gallery options.
	 * @param {mixed} additional - additional args.
	 */
	VP.prototype.initFjGallery = function (
		options = false,
		additional = null
	) {
		const self = this;

if (
			self.$items_wrap.fjGallery &&
			self.options.layout === 'justified'
		) {
			const initOptions =
				options !== false
					? options
					: {
							gutter: {
								horizontal:
									parseFloat( self.options.itemsGap ) || 0,
								vertical:
									self.options.itemsGapVertical !== ''
										? parseFloat(
												self.options.itemsGapVertical
										  ) || 0
										: parseFloat( self.options.itemsGap ) ||
										  0,
							},
							rowHeight:
								parseFloat( self.options.justifiedRowHeight ) ||
								200,
							maxRowsCount:
								parseInt(
									self.options.justifiedMaxRowsCount,
									10
								) || 0,
							lastRow: self.options.justifiedLastRow || 'left',
							rowHeightTolerance:
								parseFloat(
									self.options.justifiedRowHeightTolerance
								) || 0,
							calculateItemsHeight: true,
							itemSelector: '.vp-portfolio__item-wrap',
							imageSelector: '.vp-portfolio__item-img img',
							transitionDuration: '0.3s',
					  };

if ( initOptions.maxRowsCount === 0 ) {
				initOptions.maxRowsCount = Number.POSITIVE_INFINITY;
			}

self.emitEvent( 'beforeInitFjGallery', [
				initOptions,
				additional,
			] );

self.$items_wrap.fjGallery( initOptions, additional );

self.emitEvent( 'initFjGallery', [ initOptions, additional ] );
		}
	};

/**
	 * Destroy fjGallery plugin
	 */
	VP.prototype.destroyFjGallery = function () {
		const self = this;
		const fjGallery = self.$items_wrap.data( 'fjGallery' );

if ( fjGallery ) {
			self.$items_wrap.fjGallery( 'destroy' );

self.emitEvent( 'destroyFjGallery' );
		}
	};
} );

// Add Items.
$( document ).on( 'addItems.vpf', ( event, self, $items, removeExisting ) => {
	if ( event.namespace !== 'vpf' ) {
		return;
	}

const fjGallery = self.$items_wrap.data( 'fjGallery' );

if ( ! fjGallery ) {
		return;
	}

if ( removeExisting ) {
		self.destroyFjGallery();
		self.$items_wrap.find( '.vp-portfolio__item-wrap' ).remove();
		self.$items_wrap.prepend( $items );
		self.initFjGallery();
	} else {
		self.$items_wrap.append( $items );
		self.initFjGallery( 'appendImages', $items );
	}
} );

// Init.
$( document ).on( 'init.vpf', ( event, self ) => {
	if ( event.namespace !== 'vpf' ) {
		return;
	}

self.initFjGallery();
} );

// Images Loaded.
$( document ).on( 'imagesLoaded.vpf', ( event, self ) => {
	if ( event.namespace !== 'vpf' ) {
		return;
	}

// sometimes on iOs images failed to calculate positions, so we need this imagesLoaded event.
	// related issue: https://github.com/nk-crew/visual-portfolio/issues/55
	self.initFjGallery();
} );

// Destroy.
$( document ).on( 'destroy.vpf', ( event, self ) => {
	if ( event.namespace !== 'vpf' ) {
		return;
	}

self.destroyFjGallery();
} );