source: extensions/iPiwigo/www/extensions/jqt.scaling.min.js @ 9190

/**
 * 
 * Add support for scaling using jQTouch
 *
 * Copyright (c) 2009 Sam Shull <http://www.google.com/profiles/brickysam26>
 * Released under MIT license
 *
 * <code>
 *
 *        <div>
 *            <img src="http://rlv.zcache.com/css_is_awesome_mug-p1687164350719819282objs_210.jpg" alt="CSS Is Awesome" class="scalable"/>
 *        </div>
 *
 * </code>
 *
 * Known issues:
 *        - using a link that is a slideSelector (ie: body > * > ul li a) on the same psuedo-page causes problems during scaling
 *
 *
 * 
 */
(function(b){b.fn.scalable=function(c){return this.each(function(){new a(this,c)})};if(b.jQTouch){b.jQTouch.addExtension(function(d){function c(g,f){f.page.find(".scalable").scalable()}b(document.body).bind("pageInserted",c);b(function(){b("body > *").each(function(){c({},{page:b(this)})})});return{}});function a(d,c){var e=this;this.numberOfTouches=2;this.element=d;this.scale(1);this.refresh();this.scaleLessThanOne=false;d.style.webkitTransitionTimingFunction="cubic-bezier(0, 0, 0.2, 1)";d.addEventListener("touchstart",this,false);d.addEventListener("touchmove",this,false);d.addEventListener("touchend",this,false);window.addEventListener("unload",function(){d.removeEventListener("touchstart",e,false);d.removeEventListener("touchmove",e,false);d.removeEventListener("touchend",e,false);this.removeEventListener("unload",arguments.callee,false)},false);if(c){b.extend(this,c)}}a.prototype={handleEvent:function(c){switch(c.type){case"touchstart":return this.onTouchStart(c);break;case"touchmove":return this.onTouchMove(c);break;case"touchend":return this.onTouchEnd(c);break}},scale:function(c){if(c!==undefined){this._scale=c;this.element.style.webkitTransform="scale("+c+")";return}return this._scale},refresh:function(){this.element.style.webkitTransitionDuration="0"},onTouchStart:function(c){if(c.targetTouches.length!=this.numberOfTouches){return}this.refresh();this.moved=false;this.startDistance=Math.sqrt(Math.pow((c.targetTouches[1].clientX-c.targetTouches[0].clientX),2)+Math.pow((c.targetTouches[1].clientX-c.targetTouches[0].clientX),2));return false},onTouchMove:function(f){if(f.targetTouches.length!=this.numberOfTouches){return}f.preventDefault();this.moved=true;this.refresh();var c=Math.sqrt(Math.pow((f.targetTouches[1].clientX-f.targetTouches[0].clientX),2)+Math.pow((f.targetTouches[1].clientY-f.targetTouches[0].clientY),2)),g=c-this.startDistance,d=(g/this.startDistance)/2;this.scale(this.scale()+(this.scale()*d));this.startDistance=c;return false},onTouchEnd:function(d){var c,f;if(!this.moved){c=d.target;if(c.nodeType==3){c=c.parentNode}f=document.createEvent("MouseEvents");f.initEvent("click",true,true);c.dispatchEvent(f);return}d.preventDefault();d.stopPropagation();if(!this.scaleLessThanOne&&this.scale()<1){this.element.style.webkitTransitionDuration="200ms";this.scale(1)}return false},scaleTo:function(c,d){this.element.style.webkitTransitionDuration=d?d:"300ms";this.scale(c?c:0)}}}})(jQuery);