//alert('scroll_init.js');

dw_scrollObjs = {};
dw_scrollObj.speed = 100; // default speed for mouseover scrolling


/**
 * Constructor
 *
 * @param wnId id of layer containing scrolling layers (clipped layer)
 * @param lyrId id of layer to scroll
 * @param cntId id of table or other element that scrolling content is nested in
 */
function dw_scrollObj(wnId, lyrId, cntId) {
//	alert('scroll_init.js: dw_scrollObj(wnId, lyrId, cntId)');
	
	this.id = wnId;
	dw_scrollObjs[this.id] = this;
	this.animString = "dw_scrollObjs." + this.id;
	this.load(lyrId, cntId);
}


/**
 *
 */
dw_scrollObj.loadLayer = function(wnId, id, cntId) {
//	alert('scroll_init.js: dw_scrollObj.loadLayer(wnId, id, cntId)');

	if ( dw_scrollObjs[wnId] ) {
		dw_scrollObjs[wnId].load(id, cntId);
	}
}


/**
 *
 */
dw_scrollObj.prototype.load = function(lyrId, cntId) {
//	alert('scroll_init.js: dw_scrollObj.prototype.load(lyrId, cntId)');
	
	if (!document.getElementById) {
		return;
	}

	var wndo, lyr;

	if (this.lyrId) {
		lyr = document.getElementById(this.lyrId);
		lyr.style.visibility = "hidden";
	}

	lyr = document.getElementById(lyrId);
	wndo = document.getElementById(this.id);
	lyr.style.top = this.y = 0; lyr.style.left = this.x = 0;
	this.maxY = (lyr.offsetHeight - wndo.offsetHeight > 0)? lyr.offsetHeight - wndo.offsetHeight: 0;
	this.wd = cntId? document.getElementById(cntId).offsetWidth: lyr.offsetWidth;
	this.maxX = (this.wd - wndo.offsetWidth > 0)? this.wd - wndo.offsetWidth: 0;
	this.lyrId = lyrId; // hold id of currently visible layer
	lyr.style.visibility = "visible";
	this.on_load(); this.ready = true;
}


/**
 *
 */
dw_scrollObj.prototype.on_load = function() {
//	alert('scroll_init.js: dw_scrollObj.prototype.on_load');
}  


/**
 *
 */
dw_scrollObj.prototype.shiftTo = function(lyr, x, y) {
//	alert('scroll_init.js: dw_scrollObj.prototype.shiftTo(lyr, x, y)');
	
	lyr.style.left = (this.x = x) + "px"; 
	lyr.style.top = (this.y = y) + "px";
}



/** 
 * Removes layers from table for ns6+/mozilla (needed for scrolling inside tables)
 */
dw_scrollObj.GeckoTableBugFix = function() {
//	alert('scroll_init.js: dw_scrollObj.GeckoTableBugFix()');
	
	var i, wndo, holderId, holder, x, y;
	
	if ( navigator.userAgent.indexOf("Gecko") > -1 && navigator.userAgent.indexOf("Firefox") == -1 ) {
		dw_scrollObj.hold = []; // holds id's of wndo and its container
		
		for (i=0; arguments[i]; i++) {
			if ( dw_scrollObjs[ arguments[i] ] ) {
				wndo = document.getElementById(arguments[i]);
				holderId = wndo.parentNode.id;
				holder = document.getElementById(holderId);
				document.body.appendChild(holder.removeChild(wndo));
				
				wndo.style.zIndex = 1000;
				
				x = holder.offsetLeft;
				y = holder.offsetTop;
				
				wndo.style.left = x + "px";
				wndo.style.top = y + "px";
				
				dw_scrollObj.hold[i] = [arguments[i], holderId];
			}
		}
		window.addEventListener("resize", dw_scrollObj.rePositionGecko, true);
	}
}


/**
 * ns6+/mozilla need to reposition layers onresize when scrolling inside tables.
 */
dw_scrollObj.rePositionGecko = function() {
//	alert('scroll_init.js: dw_scrollObj.rePositionGecko()');
	
	var i, wndo, holder, x, y;
	
	if (dw_scrollObj.hold) {
		for (i=0; dw_scrollObj.hold[i]; i++) {
			wndo = document.getElementById(dw_scrollObj.hold[i][0]);
			holder = document.getElementById(dw_scrollObj.hold[i][1]);
			
			x = holder.offsetLeft;
			y = holder.offsetTop;
			
			wndo.style.left = x + "px";
			wndo.style.top = y + "px";
		}
	}
}