zdragdroplib.js

javascript资料（源码

//JavaScript zEvents Library v1.0 by Nicholas C. Zakas, http://www.nczonline.net
function zEvent(){this.type=null;this.target=null;this.relatedTarget=null;this.cancelable=false;this.timeStamp=null;this.returnValue=true;};zEvent.prototype.initEvent=function($a,$b){this.type=$a;this.cancelable=$b;this.timeStamp=(new Date()).getTime();};zEvent.prototype.preventDefault=function(){if(this.cancelable){this.returnValue=false;}};function zEventTarget(){this.eventhandlers=new Object();};zEventTarget.prototype.addEventListener=function($a,$z){if(typeof this.eventhandlers[$a]=="undefined"){this.eventhandlers[$a]=new Array;};this.eventhandlers[$a].push($z);};zEventTarget.prototype.dispatchEvent=function($d){$d.target=this;if(typeof this.eventhandlers[$d.type]!="undefined"){for(var i=0;i<this.eventhandlers[$d.type].length;i++){this.eventhandlers[$d.type][i]($d);}};return $d.returnValue;};zEventTarget.prototype.removeEventListener=function($a,$z){if(typeof this.eventhandlers[$a]!="undefined"){var $e=new Array;for(var i=0;i<this.eventhandlers[$a].length;i++){if(this.eventhandlers[$a][i]!=$z){$e.push(this.eventhandlers[$a][i]);}};this.eventhandlers[$a]=$e;}};
//JavaScript zDragDrop Library v1.0 by Nicholas C. Zakas, http://www.nczonline.net
function zDrag(){};zDrag.current=null;zDrag.dragging=false;zDrag.isDragging=function(){return this.dragging;};zDrag.setCurrent=function($a){this.current=$a;this.dragging=true;};zDrag.getCurrent=function(){return this.current;};zDrag.clearCurrent=function(){this.current=null;this.dragging=false;};function zDraggable($b,$z){zEventTarget.call(this);this.construct($b,$z);this.diffX=0;this.diffY=0;this.targets=[];};zDraggable.prototype=new zEventTarget;zDraggable.DRAG_X=1;zDraggable.DRAG_Y=2;zDraggable.prototype.addDropTarget=function($e){this.targets.push($e);};zDraggable.prototype.construct=function($b,$z){this.element=$b;this.constraints=$z;var $f=this;var $g=function(){var $h=new zDragDropEvent();$h.initDragDropEvent("dragstart",true);if($f.dispatchEvent($h)){var $i=arguments[0]||window.event;$f.diffX=$i.clientX-$f.element.offsetLeft;$f.diffY=$i.clientY-$f.element.offsetTop;$f.attachEventHandlers();zDrag.setCurrent($f);}};if(this.element.addEventListener){this.element.addEventListener("mousedown",$g,false);}else if(this.element.attachEvent){this.element.attachEvent("onmousedown",$g);}else{throw new Error("zDrag not supported in this browser.");}};zDraggable.prototype.attachEventHandlers=function(){var $f=this;this.tempMouseMove=function(){var $i=arguments[0]||window.event;var $j=$i.clientX-$f.diffX;var $k=$i.clientY-$f.diffY;if($f.constraints&zDraggable.DRAG_X){$f.element.style.left=$j;};if($f.constraints&zDraggable.DRAG_Y){$f.element.style.top=$k;};var $l=new zDragDropEvent();$l.initDragDropEvent("drag",false);$f.dispatchEvent($l);};$f.tempMouseUp=function(){var $i=arguments[0]||window.event;var $e=$f.getDropTarget($i.clientX,$i.clientY);if($e!=null){var $m=new zDragDropEvent();$m.initDragDropEvent("drop",false,$f);$e.dispatchEvent($m);};var $n=new zDragDropEvent();$n.initDragDropEvent("dragend",false);$f.dispatchEvent($n);zDrag.clearCurrent();$f.detachEventHandlers();};if(document.body.addEventListener){document.body.addEventListener("mousemove",this.tempMouseMove,false);document.body.addEventListener("mouseup",this.tempMouseUp,false);}else if(document.body.attachEvent){document.body.attachEvent("onmousemove",this.tempMouseMove);document.body.attachEvent("onmouseup",this.tempMouseUp);}else{throw new Error("zDrag doesn't support this browser.");}};zDraggable.prototype.detachEventHandlers=function(){if(document.body.removeEventListener){document.body.removeEventListener("mousemove",this.tempMouseMove,false);document.body.removeEventListener("mouseup",this.tempMouseUp,false);}else if(document.body.detachEvent){document.body.detachEvent("onmousemove",this.tempMouseMove);document.body.detachEvent("onmouseup",this.tempMouseUp);}else{throw new Error("zDrag doesn't support this browser.");}};zDraggable.prototype.getDropTarget=function(iX,iY){for(var i=0;i<this.targets.length;i++){if(this.targets[i].isOver(iX,iY)){return this.targets[i];}};return null;};zDraggable.prototype.moveTo=function(iX,iY){this.element.style.left=iX+"px";this.element.style.top=iY+"px";};zDraggable.prototype.getLeft=function(){return this.element.offsetLeft;};zDraggable.prototype.getTop=function(){return this.element.offsetTop;};function zDragDropEvent(){zEvent.call(this);};zDragDropEvent.prototype=new zEvent();zDragDropEvent.prototype.initDragDropEvent=function($p,$q,$r){this.initEvent($p,$q);this.relatedTarget=$r;};function zDropTarget($b){zEventTarget.call(this);this.construct($b);};zDropTarget.prototype=new zEventTarget;zDropTarget.prototype.construct=function($b){this.element=$b;};zDropTarget.prototype.isOver=function(iX,iY){var $s=this.element.offsetLeft;var $t=$s+this.element.offsetWidth;var $u=this.element.offsetTop;var $v=$u+this.element.offsetHeight;return(iX>=$s&&iX<=$t&&iY>=$u&&iY<=$v);};zDropTarget.prototype.getLeft=function(){return this.element.offsetLeft;};zDropTarget.prototype.getTop=function(){return this.element.offsetTop;};zDropTarget.prototype.getHeight=function(){return this.element.offsetHeight;};zDropTarget.prototype.getWidth=function(){return this.element.offsetWidth;};