libjs-jquery-event-drag 12-1 / usr / share / javascript / jquery-event-drag / jquery.event.drag.min.js

(function($){$.fn.drag=function(fn1,fn2,fn3){if(fn2)this.bind("dragstart",fn1);if(fn3)this.bind("dragend",fn3);return!fn1?this.trigger("drag"):this.bind("drag",fn2?fn2:fn1)};var $event=$.event,$special=$event.special,drag=$special.drag={not:":input",distance:0,which:1,dragging:false,setup:function(data){data=$.extend({distance:drag.distance,which:drag.which,not:drag.not},data||{});data.distance=squared(data.distance);$event.add(this,"mousedown",handler,data);if(this.attachEvent)this.attachEvent("ondragstart",dontStart)},teardown:function(){$event.remove(this,"mousedown",handler);if(this===drag.dragging)drag.dragging=drag.proxy=false;selectable(this,true);if(this.detachEvent)this.detachEvent("ondragstart",dontStart)}};$special.dragstart=$special.dragend={setup:function(){},teardown:function(){}};function handler(event){var elem=this,returned,data=event.data||{};if(data.elem){elem=event.dragTarget=data.elem;event.dragProxy=drag.proxy||elem;event.cursorOffsetX=data.pageX-data.left;event.cursorOffsetY=data.pageY-data.top;event.offsetX=event.pageX-event.cursorOffsetX;event.offsetY=event.pageY-event.cursorOffsetY}else if(drag.dragging||data.which>0&&event.which!=data.which||$(event.target).is(data.not))return;switch(event.type){case"mousedown":$.extend(data,$(elem).offset(),{elem:elem,target:event.target,pageX:event.pageX,pageY:event.pageY});$event.add(document,"mousemove mouseup",handler,data);selectable(elem,false);drag.dragging=null;return false;case!drag.dragging&&"mousemove":if(squared(event.pageX-data.pageX)+squared(event.pageY-data.pageY)<data.distance)break;event.target=data.target;returned=hijack(event,"dragstart",elem);if(returned!==false){drag.dragging=elem;drag.proxy=event.dragProxy=$(returned||elem)[0]}case"mousemove":if(drag.dragging){returned=hijack(event,"drag",elem);if($special.drop){$special.drop.allowed=returned!==false;$special.drop.handler(event)}if(returned!==false)break;event.type="mouseup"}case"mouseup":$event.remove(document,"mousemove mouseup",handler);if(drag.dragging){if($special.drop)$special.drop.handler(event);hijack(event,"dragend",elem)}selectable(elem,true);drag.dragging=drag.proxy=data.elem=false;break}return true}function hijack(event,type,elem){event.type=type;var result=$.event.handle.call(elem,event);return result===false?false:result||event.result}function squared(value){return Math.pow(value,2)}function dontStart(){return drag.dragging===false}function selectable(elem,bool){if(!elem)return;elem.unselectable=bool?"off":"on";elem.onselectstart=function(){return bool};if(elem.style)elem.style.MozUserSelect=bool?"":"none"}})(jQuery);