jquery.event.drag-2.0.js

/*! 
 * jquery.event.drag - v 2.0.0 
 * Copyright (c) 2010 Three Dub Media - http://threedubmedia.com
 * Open Source MIT License - http://threedubmedia.com/code/license
 */
;(function(f){f.fn.drag=function(b,a,d){var e=typeof b=="string"?b:"",k=f.isFunction(b)?b:f.isFunction(a)?a:null;if(e.indexOf("drag")!==0)e="drag"+e;d=(b==k?a:d)||{};return k?this.bind(e,d,k):this.trigger(e)};var i=f.event,h=i.special,c=h.drag={defaults:{which:1,distance:0,not:":input",handle:null,relative:false,drop:true,click:false},datakey:"dragdata",livekey:"livedrag",add:function(b){var a=f.data(this,c.datakey),d=b.data||{};a.related+=1;if(!a.live&&b.selector){a.live=true;i.add(this,"draginit."+ c.livekey,c.delegate)}f.each(c.defaults,function(e){if(d[e]!==undefined)a[e]=d[e]})},remove:function(){f.data(this,c.datakey).related-=1},setup:function(){if(!f.data(this,c.datakey)){var b=f.extend({related:0},c.defaults);f.data(this,c.datakey,b);i.add(this,"mousedown",c.init,b);this.attachEvent&&this.attachEvent("ondragstart",c.dontstart)}},teardown:function(){if(!f.data(this,c.datakey).related){f.removeData(this,c.datakey);i.remove(this,"mousedown",c.init);i.remove(this,"draginit",c.delegate);c.textselect(true); this.detachEvent&&this.detachEvent("ondragstart",c.dontstart)}},init:function(b){var a=b.data,d;if(!(a.which>0&&b.which!=a.which))if(!f(b.target).is(a.not))if(!(a.handle&&!f(b.target).closest(a.handle,b.currentTarget).length)){a.propagates=1;a.interactions=[c.interaction(this,a)];a.target=b.target;a.pageX=b.pageX;a.pageY=b.pageY;a.dragging=null;d=c.hijack(b,"draginit",a);if(a.propagates){if((d=c.flatten(d))&&d.length){a.interactions=[];f.each(d,function(){a.interactions.push(c.interaction(this,a))})}a.propagates= a.interactions.length;a.drop!==false&&h.drop&&h.drop.handler(b,a);c.textselect(false);i.add(document,"mousemove mouseup",c.handler,a);return false}}},interaction:function(b,a){return{drag:b,callback:new c.callback,droppable:[],offset:f(b)[a.relative?"position":"offset"]()||{top:0,left:0}}},handler:function(b){var a=b.data;switch(b.type){case !a.dragging&&"mousemove":if(Math.pow(b.pageX-a.pageX,2)+Math.pow(b.pageY-a.pageY,2)<Math.pow(a.distance,2))break;b.target=a.target;c.hijack(b,"dragstart",a); if(a.propagates)a.dragging=true;case "mousemove":if(a.dragging){c.hijack(b,"drag",a);if(a.propagates){a.drop!==false&&h.drop&&h.drop.handler(b,a);break}b.type="mouseup"}case "mouseup":i.remove(document,"mousemove mouseup",c.handler);if(a.dragging){a.drop!==false&&h.drop&&h.drop.handler(b,a);c.hijack(b,"dragend",a)}c.textselect(true);if(a.click===false&&a.dragging){jQuery.event.triggered=true;setTimeout(function(){jQuery.event.triggered=false},20);a.dragging=false}break}},delegate:function(b){var a= [],d,e=f.data(this,"events")||{};f.each(e.live||[],function(k,j){if(j.preType.indexOf("drag")===0)if(d=f(b.target).closest(j.selector,b.currentTarget)[0]){i.add(d,j.origType+"."+c.livekey,j.origHandler,j.data);f.inArray(d,a)<0&&a.push(d)}});if(!a.length)return false;return f(a).bind("dragend."+c.livekey,function(){i.remove(this,"."+c.livekey)})},hijack:function(b,a,d,e,k){if(d){var j={event:b.originalEvent,type:b.type},n=a.indexOf("drop")?"drag":"drop",l,o=e||0,g,m;e=!isNaN(e)?e:d.interactions.length; b.type=a;b.originalEvent=null;d.results=[];do if(g=d.interactions[o])if(!(a!=="dragend"&&g.cancelled)){m=c.properties(b,d,g);g.results=[];f(k||g[n]||d.droppable).each(function(q,p){l=(m.target=p)?i.handle.call(p,b,m):null;if(l===false){if(n=="drag"){g.cancelled=true;d.propagates-=1}if(a=="drop")g[n][q]=null}else if(a=="dropinit")g.droppable.push(c.element(l)||p);if(a=="dragstart")g.proxy=f(c.element(l)||g.drag)[0];g.results.push(l);delete b.result;if(a!=="dropinit")return l});d.results[o]=c.flatten(g.results); if(a=="dropinit")g.droppable=c.flatten(g.droppable);a=="dragstart"&&!g.cancelled&&m.update()}while(++o<e);b.type=j.type;b.originalEvent=j.event;return c.flatten(d.results)}},properties:function(b,a,d){var e=d.callback;e.drag=d.drag;e.proxy=d.proxy||d.drag;e.startX=a.pageX;e.startY=a.pageY;e.deltaX=b.pageX-a.pageX;e.deltaY=b.pageY-a.pageY;e.originalX=d.offset.left;e.originalY=d.offset.top;e.offsetX=b.pageX-(a.pageX-e.originalX);e.offsetY=b.pageY-(a.pageY-e.originalY);e.drop=c.flatten((d.drop||[]).slice()); e.available=c.flatten((d.droppable||[]).slice());return e},element:function(b){if(b&&(b.jquery||b.nodeType==1))return b},flatten:function(b){return f.map(b,function(a){return a&&a.jquery?f.makeArray(a):a&&a.length?c.flatten(a):a})},textselect:function(b){f(document)[b?"unbind":"bind"]("selectstart",c.dontstart).attr("unselectable",b?"off":"on").css("MozUserSelect",b?"":"none")},dontstart:function(){return false},callback:function(){}};c.callback.prototype={update:function(){h.drop&&this.available.length&& f.each(this.available,function(b){h.drop.locate(this,b)})}};h.draginit=h.dragstart=h.dragend=c})(jQuery);