/*********************************************************
用法：
	<script language = "JavaScript" src="/inc_js/prototype.js" type = "text/javascript"></script>
	<script language = "JavaScript" src="/inc_js/album/effects.js" type = "text/javascript"></script>
	<script language = "JavaScript" src="/inc_js/screenMask.js" type = "text/javascript"></script>
	

	2:<input type="button" onclick="myMask.show('登录','/login.html',500,600')" value="登录">

**********************************************************/

Object.extend(Element, {
	setWidth: function(element,w) {
	   	element = $(element);
		element.style.width = w +"px";
	},
	setHeight: function(element,h) {
   		element = $(element);
    		element.style.height = h +"px";
	},
	setTop: function(element,t) {
	   	element = $(element);
		element.style.top = t +"px";
	},
	setSrc: function(element,src) {
		element = $(element);
		element.src = src; 
	},
	setInnerHTML: function(element,content) {
		element = $(element);
		element.innerHTML = content;
	}
});

var screenMask = {
	closeImage:"/images/mclose.gif",
	show: function(title,src,w_,h_){
		hideSelect(true);
		document.getElementsByTagName('body')[0].style.overflow="hidden";
		var objBody = document.getElementsByTagName("body").item(0);
		var objOverlay = document.createElement("div");
		objOverlay.setAttribute('id','overlay');
		objOverlay.style.display = 'none';		
		objBody.appendChild(objOverlay);
		
		var objContentBox = document.createElement("div");
		objContentBox.setAttribute('id','markContentBox_');
		objContentBox.style.display = 'none';
		objBody.appendChild(objContentBox);
		
		var objContainer = document.createElement("div");
		objContainer.setAttribute('id','contentContainer');
		objContentBox.appendChild(objContainer);
		
		var objTopbar = document.createElement("div");
		objTopbar.setAttribute('id','maskTopbar');
		objContainer.appendChild(objTopbar);
		
		var objTitleBox = document.createElement("span");
		objTitleBox.setAttribute('id','maskTitle');
		objTopbar.appendChild(objTitleBox);

		var objCloseImage = document.createElement("img");
		objCloseImage.setAttribute('src', this.closeImage);
		objCloseImage.setAttribute('id','closeImage');
		objCloseImage.onclick = function(){screenMask.hide()};
		objCloseImage.setAttribute('alt','关闭');
		objTopbar.appendChild(objCloseImage);

		var objIframe = '<iframe id="maskIframe_" src="about:blank" frameborder="0" marginheight="0" marginwidth="0" hspace="0" vspace="0" scrolling="no" width="100%" height="100%"></iframe>';
		 new Insertion.After("maskTopbar",objIframe);
		
		//显示背景
		var arrayPageSize = getPageSize();
		Element.setHeight('overlay', arrayPageSize[1]);
		new Effect.Appear('overlay', { duration: 0.2, from: 0.0, to: 0.8 });
		
		var arrayPageScroll = getPageScroll();

		var margintop=  (self.innerHeight)?"8":"8";

		var myContentTop = arrayPageScroll[1] + 30;	// 150(arrayPageSize[3] / margintop);
		Element.show('contentContainer');
		Element.setHeight('markContentBox_',h_); 
		Element.setWidth('contentContainer',w_); 
			
		Element.setInnerHTML('maskTitle',title);
		Element.setTop('markContentBox_', myContentTop);
		//window.frames["maskIframe_"].document.write("数据载入中...");
		Element.setSrc('maskIframe_',src);
	
		Effect.Grow("markContentBox_",{duration:0.5});


	},
	hide: function(){
		Element.setSrc('maskIframe_','about:blank');
		Element.hide('contentContainer');
		Element.hide('markContentBox_');
		Element.remove('maskIframe_','contentContainer','markContentBox_','maskTopbar','maskTitle');

		new Effect.Fade('overlay', { duration: 0.8});
		hideSelect(false);
		document.getElementsByTagName('body')[0].style.overflow="auto";
	}
}

var myMask = screenMask;

function getPageScroll(){

	var yScroll;

	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
		yScroll = document.documentElement.scrollTop;
	} else if (document.body) {// all other Explorers
		yScroll = document.body.scrollTop;
	}

	arrayPageScroll = new Array('',yScroll) 
	return arrayPageScroll;
}

function getPageSize(){
	
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.scrollHeight&&document.documentElement.clientHeight) { // Explorer 6 Strict Mode
       		windowWidth = Math.max(document.documentElement.scrollWidth,document.documentElement.clientWidth);
	 	windowHeight = Math.max(document.documentElement.scrollHeight,document.documentElement.clientHeight);

	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}

	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight)
	return arrayPageSize;

}

function hideSelect(s){
	var sel = document.getElementsByTagName("select");
	for (var i = 0; i < sel.length; i++){
		if (s){
			sel[i].style.visibility = "hidden";
		}else{
			sel[i].style.visibility = "visible";
		}
	}
}