/**
 * Visibility mode constant for use with {@link #setVisibilityMode}. Use visibility to hide element
 * @static
 * @type Number
 */
Ext.Element.VISIBILITY = 1;
/**
 * Visibility mode constant for use with {@link #setVisibilityMode}. Use display to hide element
 * @static
 * @type Number
 */
Ext.Element.DISPLAY = 2;

Ext.Element.addMethods(function(){
	var VISIBILITY = "visibility",
		DISPLAY = "display",
		HIDDEN = "hidden",
		NONE = "none",		
		ELDISPLAY = Ext.Element.DISPLAY;
	
	return {
		
/**
	     * The element's default display mode  (defaults to "")
	     * @type String
	     */
	    originalDisplay : "",
	    visibilityMode : 1,
	    
	    
/**
	     * Sets the element's visibility mode. When setVisible() is called it
	     * will use this to determine whether to set the visibility or the display property.
         * @param visMode Ext.Element.VISIBILITY or Ext.Element.DISPLAY
	     * @return {Ext.Element} this
	     */
	    setVisibilityMode : function(visMode){	  
	        this.visibilityMode = visMode;
	        return this;
	    },
	    
	    
/**
	     * Perform animation on this element.
	     * @param {Object} args The animation control args
	     * @param {Float} duration (optional) How long the animation lasts in seconds (defaults to .35)
	     * @param {Function} onComplete (optional) Function to call when animation completes
	     * @param {String} easing (optional) Easing method to use (defaults to 'easeOut')
	     * @param {String} animType (optional) 'run' is the default. Can also be 'color', 'motion', or 'scroll'
	     * @return {Ext.Element} this
	     */
	    animate : function(args, duration, onComplete, easing, animType){	    
	        this.anim(args, {duration: duration, callback: onComplete, easing: easing}, animType);
	        return this;
	    },
	
	    /*
	     * @private Internal animation call
	     */
	    anim : function(args, opt, animType, defaultDur, defaultEase, cb){
	        animType = animType || 'run';
	        opt = opt || {};
	        var me = this,	        	
	        	anim = Ext.lib.Anim[animType](
		            me.dom, 
		            args,
		            (opt.duration || defaultDur) || .35,
		            (opt.easing || defaultEase) || 'easeOut',
		            function(){
			            if(cb) cb.call(me);
			            if(opt.callback) opt.callback.call(opt.scope || me, me, opt);
		            },
		            me
		        );
	        opt.anim = anim;
	        return anim;
	    },
	
	    // private legacy anim prep
	    preanim : function(a, i){
	        return !a[i] ? false : (Ext.isObject(a[i]) ? a[i]: {duration: a[i+1], callback: a[i+2], easing: a[i+3]});
	    },
	    
	    
/**
	     * Checks whether the element is currently visible using both visibility and display properties.	     
	     * @return {Boolean} True if the element is currently visible, else false
	     */
	    isVisible : function(deep) {
	        return !this.isStyle(VISIBILITY, HIDDEN) || !this.isStyle(DISPLAY, NONE);	        
	    },
	    
	    
/**
	     * Sets the visibility of the element (see details). If the visibilityMode is set to Element.DISPLAY, it will use
	     * the display property to hide the element, otherwise it uses visibility. The default is to hide and show using the visibility property.
	     * @param {Boolean} visible Whether the element is visible
	     * @param {Boolean/Object} animate (optional) True for the default animation, or a standard Element animation config object
	     * @return {Ext.Element} this
	     */
	     setVisible : function(visible, animate){
		    var me = this,
	            visMode = me.visibilityMode;
	            
	        if (!animate || !me.anim) {
	            if (me.visibilityMode == ELDISPLAY) {
	                me.setDisplayed(visible);
	            } else {
	                me.fixDisplay();
	                me.dom.style.visibility = visible ? "visible" : HIDDEN;
	            }
	        } else {
	            // closure for composites            
	            if(visible){
	                me.setOpacity(.01);
	                me.setVisible(true);
	            }
	            me.anim({opacity: { to: (visible?1:0) }},
	                    me.preanim(arguments, 1),
	                    null,
	                    .35,
	                    'easeIn',
	                    function(){
		                     if(!visible){
			                     if (visMode == ELDISPLAY) {
		                         	style.display = NONE;
	                         	 } else {
		                         	style.visibility = HIDDEN;
	                         	 }	                         
		                         Ext.get(me.dom).setOpacity(1);
		                     }
	                 	});
	        }
	        return me;
	    },
	
	    
/**
	     * Toggles the element's visibility or display, depending on visibility mode.
	     * @param {Boolean/Object} animate (optional) True for the default animation, or a standard Element animation config object
	     * @return {Ext.Element} this
	     */
	    toggle : function(animate){
		    var me = this;
	        me.setVisible(!me.isVisible(), me.preanim(arguments, 0));
	        return me;
	    },
	
	    
/**
	     * Sets the CSS display property. Uses originalDisplay if the specified value is a boolean true.
	     * @param {Mixed} value Boolean value to display the element using its default display, or a string to set the display directly.
	     * @return {Ext.Element} this
	     */
	    setDisplayed : function(value) {		    
		    if(typeof value == "boolean"){
	           value = value ? this.originalDisplay : NONE;
	        }
	        this.setStyle(DISPLAY, value);
	        return this;
	    },
	    
	    // private
	    fixDisplay : function(){
		    var me = this;
	        if(me.isStyle(DISPLAY, NONE)){
	            me.setStyle(VISIBILITY, HIDDEN);
	            me.setStyle(DISPLAY, me.originalDisplay); // first try reverting to default
	            if(me.isStyle(DISPLAY, NONE)){ // if that fails, default to block
	                me.setStyle(DISPLAY, "block");
	            }
	        }
	    },
	
	    
/**
	     * Hide this element - Uses display mode to determine whether to use "display" or "visibility". See {@link #setVisible}.
	     * @param {Boolean/Object} animate (optional) true for the default animation or a standard Element animation config object
	     * @return {Ext.Element} this
	     */
	    hide : function(animate){
		    this.setVisible(false, this.preanim(arguments, 0));
	        return this;
	    },
	
	    
/**
	    * Show this element - Uses display mode to determine whether to use "display" or "visibility". See {@link #setVisible}.
	    * @param {Boolean/Object} animate (optional) true for the default animation or a standard Element animation config object
	     * @return {Ext.Element} this
	     */
	    show : function(animate){
		    this.setVisible(true, this.preanim(arguments, 0));
	        return this;
	    }
	}
}());