/*!
 * Ext JS Library 3.0.0
 * Copyright(c) 2006-2009 Ext JS, LLC
 * licensing@extjs.com
 * http://www.extjs.com/license
 */
/**
 * @class Ext.Element
 */
Ext.Element.addMethods(
function(){
    var VISIBILITY = "visibility",
        DISPLAY = "display",
        HIDDEN = "hidden",
        NONE = "none",
	    XMASKED = "x-masked",
		XMASKEDRELATIVE = "x-masked-relative",
        data = Ext.Element.data;
		
	return {
		/**
	     * Checks whether the element is currently visible using both visibility and display properties.
	     * @param {Boolean} deep (optional) True to walk the dom and see if parent elements are hidden (defaults to false)
	     * @return {Boolean} True if the element is currently visible, else false
	     */
	    isVisible : function(deep) {
	        var vis = !this.isStyle(VISIBILITY,HIDDEN) && !this.isStyle(DISPLAY,NONE),
	        	p = this.dom.parentNode;
	        if(deep !== true || !vis){
	            return vis;
	        }	        
	        while(p && !/body/i.test(p.tagName)){
	            if(!Ext.fly(p, '_isVisible').isVisible()){
	                return false;
	            }
	            p = p.parentNode;
	        }
	        return true;
	    },
	    
	    /**
	     * Returns true if display is not "none"
	     * @return {Boolean}
	     */
	    isDisplayed : function() {
	        return !this.isStyle(DISPLAY, NONE);
	    },
	    
		/**
	     * Convenience method for setVisibilityMode(Element.DISPLAY)
	     * @param {String} display (optional) What to set display to when visible
	     * @return {Ext.Element} this
	     */
	    enableDisplayMode : function(display){	    
	        this.setVisibilityMode(Ext.Element.DISPLAY);
	        if(!Ext.isEmpty(display)){
                data(this.dom, 'originalDisplay', display);
            }
	        return this;
	    },
	    setSize : function(width, height, animate){
			var me = this;
			if(Ext.isObject(width)){ // in case of object from getSize()
			    height = width.height;
			    width = width.width;
			}
			width = me.adjustWidth(width);
			height = me.adjustHeight(height);
			if(!animate || !me.anim){
			    me.dom.style.width = me.addUnits(width);
			    me.dom.style.height = me.addUnits(height);
			}else{
			    me.anim({width: {to: width}, height: {to: height}}, me.preanim(arguments, 2));
			}
			return me;
	    },
	    /**
	     * Forces the browser to repaint this element
	     * @return {Ext.Element} this
	     */
	    repaint : function(){
	        var dom = this.dom;
	        this.addClass("x-repaint");
	        setTimeout(function(){
	            Ext.fly(dom).removeClass("x-repaint");
	        }, 1);
	        return this;
	    },
    getAnchorXY : function(anchor, local, s){
        //Passing a different size is useful for pre-calculating anchors,
        //especially for anchored animations that change the el size.
		anchor = (anchor || "tl").toLowerCase();
        s = s || {};
        
        var me = this,        
        	vp = me.dom == document.body || me.dom == document,
        	w = s.width || vp ? Ext.lib.Dom.getViewWidth() : me.getWidth(),
        	h = s.height || vp ? Ext.lib.Dom.getViewHeight() : me.getHeight(),         	        	
        	xy,       	
        	r = Math.round,
        	o = me.getXY(),
        	scroll = me.getScroll(),
        	extraX = vp ? scroll.left : !local ? o[0] : 0,
        	extraY = vp ? scroll.top : !local ? o[1] : 0,
        	hash = {
	        	c  : [r(w * 0.5), r(h * 0.5)],
	        	t  : [r(w * 0.5), 0],
	        	l  : [0, r(h * 0.5)],
	        	r  : [w, r(h * 0.5)],
	        	b  : [r(w * 0.5), h],
	        	tl : [0, 0],	
	        	bl : [0, h],
	        	br : [w, h],
	        	tr : [w, 0]
        	};
        
        xy = hash[anchor];	
        return [xy[0] + extraX, xy[1] + extraY]; 
    },

    getAlignToXY : function(el, p, o){	    
        el = Ext.get(el);
        
        if(!el || !el.dom){
            throw "Element.alignToXY with an element that doesn't exist";
        }
        
        o = o || [0,0];
        p = (p == "?" ? "tl-bl?" : (!/-/.test(p) && p !== "" ? "tl-" + p : p || "tl-bl")).toLowerCase();       
                
        var me = this,
        	d = me.dom,
        	a1,
        	a2,
        	x,
        	y,
        	//constrain the aligned el to viewport if necessary
        	w,
        	h,
        	r,
        	dw = Ext.lib.Dom.getViewWidth() -10, // 10px of margin for ie
        	dh = Ext.lib.Dom.getViewHeight()-10, // 10px of margin for ie
        	p1y,
        	p1x,        	
        	p2y,
        	p2x,
        	swapY,
        	swapX,
        	doc = document,
        	docElement = doc.documentElement,
        	docBody = doc.body,
        	scrollX = (docElement.scrollLeft || docBody.scrollLeft || 0)+5,
        	scrollY = (docElement.scrollTop || docBody.scrollTop || 0)+5,
        	c = false, //constrain to viewport
        	p1 = "", 
        	p2 = "",
        	m = p.match(/^([a-z]+)-([a-z]+)(\?)?$/);
        
        if(!m){
           throw "Element.alignTo with an invalid alignment " + p;
        }
        
        p1 = m[1]; 
        p2 = m[2]; 
        c = !!m[3];

        //Subtract the aligned el's internal xy from the target's offset xy
        //plus custom offset to get the aligned el's new offset xy
        a1 = me.getAnchorXY(p1, true);
        a2 = el.getAnchorXY(p2, false);

        x = a2[0] - a1[0] + o[0];
        y = a2[1] - a1[1] + o[1];

        if(c){    
	       w = me.getWidth();
           h = me.getHeight();
           r = el.getRegion();       
           //If we are at a viewport boundary and the aligned el is anchored on a target border that is
           //perpendicular to the vp border, allow the aligned el to slide on that border,
           //otherwise swap the aligned el to the opposite border of the target.
           p1y = p1.charAt(0);
           p1x = p1.charAt(p1.length-1);
           p2y = p2.charAt(0);
           p2x = p2.charAt(p2.length-1);
           swapY = ((p1y=="t" && p2y=="b") || (p1y=="b" && p2y=="t"));
           swapX = ((p1x=="r" && p2x=="l") || (p1x=="l" && p2x=="r"));          
           

           if (x + w > dw + scrollX) {
                x = swapX ? r.left-w : dw+scrollX-w;
           }
           if (x < scrollX) {
               x = swapX ? r.right : scrollX;
           }
           if (y + h > dh + scrollY) {
                y = swapY ? r.top-h : dh+scrollY-h;
            }
           if (y < scrollY){
               y = swapY ? r.bottom : scrollY;
           }
        }
        return [x,y];
    },

    alignTo : function(element, position, offsets, animate){
	    var me = this;
        return me.setXY(me.getAlignToXY(element, position, offsets),
          		        me.preanim && !!animate ? me.preanim(arguments, 3) : false);
    },
    center : function(centerIn){
        return this.alignTo(centerIn || document, 'c-c');        
    },
	    
		/**
	     * Puts a mask over this element to disable user interaction. Requires core.css.
	     * This method can only be applied to elements which accept child nodes.
	     * @param {String} msg (optional) A message to display in the mask
	     * @param {String} msgCls (optional) A css class to apply to the msg element
	     * @return {Element} The mask element
	     */
	    mask : function(msg, msgCls){
		    var me = this,
		    	dom = me.dom,
		    	dh = Ext.DomHelper,
		    	EXTELMASKMSG = "ext-el-mask-msg",
                el, 
                mask;
		    	
	        if(me.getStyle("position") == "static"){
	            me.addClass(XMASKEDRELATIVE);
	        }
	        if((el = data(dom, 'maskMsg'))){
	            el.remove();
	        }
	        if((el = data(dom, 'mask'))){
	            el.remove();
	        }
	
            mask = dh.append(dom, {cls : "ext-el-mask"}, true);
	        data(dom, 'mask', mask);
	
	        me.addClass(XMASKED);
	        mask.setDisplayed(true);
	        if(typeof msg == 'string'){
                var mm = dh.append(dom, {cls : EXTELMASKMSG, cn:{tag:'div'}}, true);
                data(dom, 'maskMsg', mm);
	            mm.dom.className = msgCls ? EXTELMASKMSG + " " + msgCls : EXTELMASKMSG;
	            mm.dom.firstChild.innerHTML = msg;
	            mm.setDisplayed(true);
	            mm.center(me);
	        }
	        if(Ext.isIE && !(Ext.isIE7 && Ext.isStrict) && me.getStyle('height') == 'auto'){ // ie will not expand full height automatically
	            mask.setHeight(me.getHeight());
	        }
	        return mask;
	    },
	
	    /**
	     * Removes a previously applied mask.
	     */
	    unmask : function(){
		    var me = this,
                dom = me.dom,
		    	mask = data(dom, 'mask'),
		    	maskMsg = data(dom, 'maskMsg');
	        if(mask){
	            if(maskMsg){
	                maskMsg.remove();
                    data(dom, 'maskMsg', undefined);
	            }
	            mask.remove();
                data(dom, 'mask', undefined);
	        }
	        me.removeClass([XMASKED, XMASKEDRELATIVE]);
	    },
	
	    /**
	     * Returns true if this element is masked
	     * @return {Boolean}
	     */
	    isMasked : function(){
            var m = data(this.dom, 'mask');
	        return m && m.isVisible();
	    },
	    
	    /**
	     * Creates an iframe shim for this element to keep selects and other windowed objects from
	     * showing through.
	     * @return {Ext.Element} The new shim element
	     */
	    createShim : function(){
	        var el = document.createElement('iframe'),        	
	        	shim;
	        el.frameBorder = '0';
	        el.className = 'ext-shim';
	        if(Ext.isIE && Ext.isSecure){
	            el.src = Ext.SSL_SECURE_URL;
	        }
	        shim = Ext.get(this.dom.parentNode.insertBefore(el, this.dom));
	        shim.autoBoxAdjust = false;
	        return shim;
	    }
    };
}());