~cdparra/gelee/trunk

/*

 * Ext JS Library 3.0 RC2

 * Copyright(c) 2006-2009, Ext JS, LLC.

 * licensing@extjs.com

 * 

 * http://extjs.com/license

 */

 

 

Ext.dd.DragTracker=function(config){Ext.apply(this,config);this.addEvents('mousedown','mouseup','mousemove','dragstart','dragend','drag');this.dragRegion=new Ext.lib.Region(0,0,0,0);if(this.el){this.initEl(this.el);}}

Ext.extend(Ext.dd.DragTracker,Ext.util.Observable,{active:false,tolerance:5,autoStart:false,initEl:function(el){this.el=Ext.get(el);el.on('mousedown',this.onMouseDown,this,this.delegate?{delegate:this.delegate}:undefined);},destroy:function(){this.el.un('mousedown',this.onMouseDown,this);},onMouseDown:function(e,target){if(this.fireEvent('mousedown',this,e)!==false&&this.onBeforeStart(e)!==false){this.startXY=this.lastXY=e.getXY();this.dragTarget=this.delegate?target:this.el.dom;if(this.preventDefault!==false){e.preventDefault();}

var doc=Ext.getDoc();doc.on('mouseup',this.onMouseUp,this);doc.on('mousemove',this.onMouseMove,this);doc.on('selectstart',this.stopSelect,this);if(this.autoStart){this.timer=this.triggerStart.defer(this.autoStart===true?1000:this.autoStart,this);}}},onMouseMove:function(e,target){if(this.active&&Ext.isIE&&!e.browserEvent.button){e.preventDefault();this.onMouseUp(e);return;}

e.preventDefault();var xy=e.getXY(),s=this.startXY;this.lastXY=xy;if(!this.active){if(Math.abs(s[0]-xy[0])>this.tolerance||Math.abs(s[1]-xy[1])>this.tolerance){this.triggerStart();}else{return;}}

this.fireEvent('mousemove',this,e);this.onDrag(e);this.fireEvent('drag',this,e);},onMouseUp:function(e){var doc=Ext.getDoc();doc.un('mousemove',this.onMouseMove,this);doc.un('mouseup',this.onMouseUp,this);doc.un('selectstart',this.stopSelect,this);e.preventDefault();this.clearStart();var wasActive=this.active;this.active=false;delete this.elRegion;this.fireEvent('mouseup',this,e);if(wasActive){this.onEnd(e);this.fireEvent('dragend',this,e);}},triggerStart:function(isTimer){this.clearStart();this.active=true;this.onStart(this.startXY);this.fireEvent('dragstart',this,this.startXY);},clearStart:function(){if(this.timer){clearTimeout(this.timer);delete this.timer;}},stopSelect:function(e){e.stopEvent();return false;},onBeforeStart:function(e){},onStart:function(xy){},onDrag:function(e){},onEnd:function(e){},getDragTarget:function(){return this.dragTarget;},getDragCt:function(){return this.el;},getXY:function(constrain){return constrain?this.constrainModes[constrain].call(this,this.lastXY):this.lastXY;},getOffset:function(constrain){var xy=this.getXY(constrain);var s=this.startXY;return[s[0]-xy[0],s[1]-xy[1]];},constrainModes:{'point':function(xy){if(!this.elRegion){this.elRegion=this.getDragCt().getRegion();}

var dr=this.dragRegion;dr.left=xy[0];dr.top=xy[1];dr.right=xy[0];dr.bottom=xy[1];dr.constrainTo(this.elRegion);return[dr.left,dr.top];}}});