//MooTools More, <http://mootools.net/more>. Copyright (c) 2006-2008 Valerio Proietti, <http://mad4milk.net>, MIT Style License.

var Drag=new Class({Implements:[Events,Options],options:{snap:6,unit:"px",grid:false,style:true,limit:false,handle:false,invert:false,preventDefault:false,modifiers:{x:"left",y:"top"}},initialize:function(){var B=Array.link(arguments,{options:Object.type,element:$defined});
this.element=$(B.element);this.document=this.element.getDocument();this.setOptions(B.options||{});var A=$type(this.options.handle);this.handles=(A=="array"||A=="collection")?$$(this.options.handle):$(this.options.handle)||this.element;
this.mouse={now:{},pos:{}};this.value={start:{},now:{}};this.selection=(Browser.Engine.trident)?"selectstart":"mousedown";this.bound={start:this.start.bind(this),check:this.check.bind(this),drag:this.drag.bind(this),stop:this.stop.bind(this),cancel:this.cancel.bind(this),eventStop:$lambda(false)};
this.attach();},attach:function(){this.handles.addEvent("mousedown",this.bound.start);return this;},detach:function(){this.handles.removeEvent("mousedown",this.bound.start);
return this;},start:function(C){if(this.options.preventDefault){C.preventDefault();}this.fireEvent("beforeStart",this.element);this.mouse.start=C.page;
var A=this.options.limit;this.limit={x:[],y:[]};for(var D in this.options.modifiers){if(!this.options.modifiers[D]){continue;}if(this.options.style){this.value.now[D]=this.element.getStyle(this.options.modifiers[D]).toInt();
}else{this.value.now[D]=this.element[this.options.modifiers[D]];}if(this.options.invert){this.value.now[D]*=-1;}this.mouse.pos[D]=C.page[D]-this.value.now[D];
if(A&&A[D]){for(var B=2;B--;B){if($chk(A[D][B])){this.limit[D][B]=$lambda(A[D][B])();}}}}if($type(this.options.grid)=="number"){this.options.grid={x:this.options.grid,y:this.options.grid};
}this.document.addEvents({mousemove:this.bound.check,mouseup:this.bound.cancel});this.document.addEvent(this.selection,this.bound.eventStop);},check:function(A){if(this.options.preventDefault){A.preventDefault();
}var B=Math.round(Math.sqrt(Math.pow(A.page.x-this.mouse.start.x,2)+Math.pow(A.page.y-this.mouse.start.y,2)));if(B>this.options.snap){this.cancel();this.document.addEvents({mousemove:this.bound.drag,mouseup:this.bound.stop});
this.fireEvent("start",this.element).fireEvent("snap",this.element);}},drag:function(A){if(this.options.preventDefault){A.preventDefault();}this.mouse.now=A.page;
for(var B in this.options.modifiers){if(!this.options.modifiers[B]){continue;}this.value.now[B]=this.mouse.now[B]-this.mouse.pos[B];if(this.options.invert){this.value.now[B]*=-1;
}if(this.options.limit&&this.limit[B]){if($chk(this.limit[B][1])&&(this.value.now[B]>this.limit[B][1])){this.value.now[B]=this.limit[B][1];}else{if($chk(this.limit[B][0])&&(this.value.now[B]<this.limit[B][0])){this.value.now[B]=this.limit[B][0];
}}}if(this.options.grid[B]){this.value.now[B]-=(this.value.now[B]%this.options.grid[B]);}if(this.options.style){this.element.setStyle(this.options.modifiers[B],this.value.now[B]+this.options.unit);
}else{this.element[this.options.modifiers[B]]=this.value.now[B];}}this.fireEvent("drag",this.element);},cancel:function(A){this.document.removeEvent("mousemove",this.bound.check);
this.document.removeEvent("mouseup",this.bound.cancel);if(A){this.document.removeEvent(this.selection,this.bound.eventStop);this.fireEvent("cancel",this.element);
}},stop:function(A){this.document.removeEvent(this.selection,this.bound.eventStop);this.document.removeEvent("mousemove",this.bound.drag);this.document.removeEvent("mouseup",this.bound.stop);
if(A){this.fireEvent("complete",this.element);}}});Element.implement({makeResizable:function(A){return new Drag(this,$merge({modifiers:{x:"width",y:"height"}},A));
}});