source: trunk/themes/default/js/ui/jquery.ui.effect-bounce.js @ 20824

/*!
 * jQuery UI Effects Bounce 1.10.1
 * http://jqueryui.com
 *
 * Copyright 2013 jQuery Foundation and other contributors
 * Released under the MIT license.
 * http://jquery.org/license
 *
 * http://api.jqueryui.com/bounce-effect/
 *
 * Depends:
 *      jquery.ui.effect.js
 */
(function( $, undefined ) {

$.effects.effect.bounce = function( o, done ) {
        var el = $( this ),
                props = [ "position", "top", "bottom", "left", "right", "height", "width" ],

                // defaults:
                mode = $.effects.setMode( el, o.mode || "effect" ),
                hide = mode === "hide",
                show = mode === "show",
                direction = o.direction || "up",
                distance = o.distance,
                times = o.times || 5,

                // number of internal animations
                anims = times * 2 + ( show || hide ? 1 : 0 ),
                speed = o.duration / anims,
                easing = o.easing,

                // utility:
                ref = ( direction === "up" || direction === "down" ) ? "top" : "left",
                motion = ( direction === "up" || direction === "left" ),
                i,
                upAnim,
                downAnim,

                // we will need to re-assemble the queue to stack our animations in place
                queue = el.queue(),
                queuelen = queue.length;

        // Avoid touching opacity to prevent clearType and PNG issues in IE
        if ( show || hide ) {
                props.push( "opacity" );
        }

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

        // default distance for the BIGGEST bounce is the outer Distance / 3
        if ( !distance ) {
                distance = el[ ref === "top" ? "outerHeight" : "outerWidth" ]() / 3;
        }

        if ( show ) {
                downAnim = { opacity: 1 };
                downAnim[ ref ] = 0;

                // if we are showing, force opacity 0 and set the initial position
                // then do the "first" animation
                el.css( "opacity", 0 )
                        .css( ref, motion ? -distance * 2 : distance * 2 )
                        .animate( downAnim, speed, easing );
        }

        // start at the smallest distance if we are hiding
        if ( hide ) {
                distance = distance / Math.pow( 2, times - 1 );
        }

        downAnim = {};
        downAnim[ ref ] = 0;
        // Bounces up/down/left/right then back to 0 -- times * 2 animations happen here
        for ( i = 0; i < times; i++ ) {
                upAnim = {};
                upAnim[ ref ] = ( motion ? "-=" : "+=" ) + distance;

                el.animate( upAnim, speed, easing )
                        .animate( downAnim, speed, easing );

                distance = hide ? distance * 2 : distance / 2;
        }

        // Last Bounce when Hiding
        if ( hide ) {
                upAnim = { opacity: 0 };
                upAnim[ ref ] = ( motion ? "-=" : "+=" ) + distance;

                el.animate( upAnim, speed, easing );
        }

        el.queue(function() {
                if ( hide ) {
                        el.hide();
                }
                $.effects.restore( el, props );
                $.effects.removeWrapper( el );
                done();
        });

        // inject all the animations we just queued to be first in line (after "inprogress")
        if ( queuelen > 1) {
                queue.splice.apply( queue,
                        [ 1, 0 ].concat( queue.splice( queuelen, anims + 1 ) ) );
        }
        el.dequeue();

};

})(jQuery);