source: trunk/themes/default/js/ui/jquery.ui.effect-drop.js @ 18953

/*!
 * jQuery UI Effects Drop 1.9.0
 * http://jqueryui.com
 *
 * Copyright 2012 jQuery Foundation and other contributors
 * Released under the MIT license.
 * http://jquery.org/license
 *
 * http://api.jqueryui.com/drop-effect/
 *
 * Depends:
 *      jquery.ui.effect.js
 */
(function( $, undefined ) {

$.effects.effect.drop = function( o, done ) {

        var el = $( this ),
                props = [ "position", "top", "bottom", "left", "right", "opacity", "height", "width" ],
                mode = $.effects.setMode( el, o.mode || "hide" ),
                show = mode === "show",
                direction = o.direction || "left",
                ref = ( direction === "up" || direction === "down" ) ? "top" : "left",
                motion = ( direction === "up" || direction === "left" ) ? "pos" : "neg",
                animation = {
                        opacity: show ? 1 : 0
                },
                distance;

        // Adjust
        $.effects.save( el, props );
        el.show();
        $.effects.createWrapper( el );

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

        if ( show ) {
                el
                        .css( "opacity", 0 )
                        .css( ref, motion === "pos" ? -distance : distance );
        }

        // Animation
        animation[ ref ] = ( show ?
                ( motion === "pos" ? "+=" : "-=" ) :
                ( motion === "pos" ? "-=" : "+=" ) ) +
                distance;

        // Animate
        el.animate( animation, {
                queue: false,
                duration: o.duration,
                easing: o.easing,
                complete: function() {
                        if ( mode === "hide" ) {
                                el.hide();
                        }
                        $.effects.restore( el, props );
                        $.effects.removeWrapper( el );
                        done();
                }
        });
};

})(jQuery);