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Editing: effect-drop.js

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/*!
 * jQuery UI Effects Drop 1.13.3
 * https://jqueryui.com
 *
 * Copyright OpenJS Foundation and other contributors
 * Released under the MIT license.
 * https://jquery.org/license
 */

//>>label: Drop Effect
//>>group: Effects
//>>description: Moves an element in one direction and hides it at the same time.
//>>docs: https://api.jqueryui.com/drop-effect/
//>>demos: https://jqueryui.com/effect/

( function( factory ) {
	"use strict";

if ( typeof define === "function" && define.amd ) {

// AMD. Register as an anonymous module.
		define( [
			"jquery",
			"../version",
			"../effect"
		], factory );
	} else {

// Browser globals
		factory( jQuery );
	}
} )( function( $ ) {
"use strict";

return $.effects.define( "drop", "hide", function( options, done ) {

var distance,
		element = $( this ),
		mode = options.mode,
		show = mode === "show",
		direction = options.direction || "left",
		ref = ( direction === "up" || direction === "down" ) ? "top" : "left",
		motion = ( direction === "up" || direction === "left" ) ? "-=" : "+=",
		oppositeMotion = ( motion === "+=" ) ? "-=" : "+=",
		animation = {
			opacity: 0
		};

$.effects.createPlaceholder( element );

distance = options.distance ||
		element[ ref === "top" ? "outerHeight" : "outerWidth" ]( true ) / 2;

animation[ ref ] = motion + distance;

if ( show ) {
		element.css( animation );

animation[ ref ] = oppositeMotion + distance;
		animation.opacity = 1;
	}

// Animate
	element.animate( animation, {
		queue: false,
		duration: options.duration,
		easing: options.easing,
		complete: done
	} );
} );

} );

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Editing: effect-drop.js

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