/*************************************************************************
	dw_tooltip.js 
	requires dw_core.js and dw_util.js
	version date: August 2002
		
	This code is from Dynamic Web Coding 
  at http://www.dyn-web.com/
  Copyright 2001-2 by Sharon Paine 
  See Terms of Use at http://www.dyn-web.com/bus/terms.html
  Permission granted to use this code 
  as long as this entire notice is included.
*************************************************************************/

var win_width, win_height, vert_scroll, hor_scroll;
var tip_t1, tip_t2;	// for setTimeouts
var mouseX, mouseY;

window.onload = initTip;
window.onresize = to_do_onresize;	

var origWidth, origHeight;
if (document.layers) {
  origWidth = window.innerWidth;
  origHeight = window.innerHeight;
}
// onresize
function to_do_onresize() {
	if (document.layers) {
	 if (window.innerWidth != origWidth || window.innerHeight != origHeight)
	    window.location.reload();
	} else {
		win_width = getWinWidth();
		win_height = getWinHeight();
	}
}

function initTip() {
	tooltip = new dynObj('tipDiv');
	if (!tooltip) return;
	if (!document.layers && typeof tooltip.doc.innerHTML == "undefined"){
		tooltip = null;	// for opera
		return; 
	}
	if (tooltip.el.style) {	// ns4 would lose all this on rewrites
		tooltip.css.width = tipWidth+"px";
		tooltip.css.fontFamily = tipFontFamily;
		tooltip.css.fontSize = tipFontSize;
		tooltip.css.lineHeight = tipLineHeight;
		tooltip.css.color = tipFontColor;
		tooltip.css.backgroundColor = tipBgColor;
		tooltip.css.borderColor = tipBorderColor;
		tooltip.css.borderWidth = tipBorderWidth+"px";
		tooltip.css.padding = tipPadding+"px";
		tooltip.css.borderStyle = tipBorderStyle;
		if (tipBgImg) tooltip.css.backgroundImage = "url("+tipBgImg+")";
	}
	// used in calculating tip position
	win_width = getWinWidth();
	win_height = getWinHeight();
}

function goTooltip(evt,cntnt) {
	if (tip_t1) clearTimeout(tip_t1);	
	if (tip_t2) clearTimeout(tip_t2); 
	// set up mousemove 
	if (tipFollowMouse) {
		if (document.addEventListener) {
			document.addEventListener("mousemove",trackMouse,true);
		} else if (document.attachEvent) {
			document.attachEvent("onmousemove",trackMouse);
		} else {
			if (document.layers && document.captureEvents) 
				document.captureEvents(Event.MOUSEMOVE);
			document.onmousemove = trackMouse;
		}
	}
	tooltip.writeLyr(cntnt);	// write tooltip content to tipDiv
	// to get document area in view, check scroll amounts
	vert_scroll = getScrollY();
	hor_scroll = getScrollX();
	// get coordinates of mouseover event
	evt = (window.event)? window.event: evt;
	if (evt) {
		mouseX = getMouseX(evt);
		mouseY = getMouseY(evt);
	}
	// get tooltip width and height, for calculating position
	// and yes style.width was set, but browsers differ ...
	tooltip.width = getWidth(tooltip.el);	
	tooltip.height = getHeight(tooltip.el);
	// again here, delay needed by some browsers
	if (!document.layers)
		setTimeout("tooltip.height=getHeight('','tipDiv')",100);
	
	// position the tooltip, delay for getHeight
	setTimeout("positionTip()",120);	
	tip_t1=setTimeout(tooltip.obj+".show()",200);	// show tooltip
}

// check coordinates and position tooltip
function positionTip() {
	var x, y;
	
	if ((mouseX + tipOffX + tooltip.width) > win_width + hor_scroll) 
		x = mouseX - (tooltip.width + tipOffX);
	else x = mouseX + tipOffX;
	
	if ((mouseY + tipOffY + tooltip.height) > win_height + vert_scroll) 
		y = (mouseY - (tooltip.height + tipOffY) > vert_scroll)?  mouseY - (tooltip.height + tipOffY): win_height + vert_scroll - (tooltip.height + tipOffY);
	else y = mouseY + tipOffY;
	tooltip.shiftTo(x,y);
}

function hideTip() {
	if (!tooltip) return;
	tip_t2=setTimeout(tooltip.obj+".hide()",200);
	// release mousemove
	if (tipFollowMouse) {
		if (document.removeEventListener) {
			document.removeEventListener("mousemove",trackMouse,true);
		} else if (document.detachEvent) {
			 document.detachEvent("onmousemove",trackMouse);
		} else {
			if (document.layers && document.releaseEvents)
				document.releaseEvents(Event.MOUSEMOVE);
			document.onmousemove = null;
		}
	}
}

// used with tipFollowMouse
function trackMouse(evt) {
	evt = (window.event)? window.event: evt;
	if (evt) {
		mouseX = getMouseX(evt);
		mouseY = getMouseY(evt);
	}
	positionTip();	
}

// functions to get page coordinates of mouse event
function getMouseX(evt) {
	return (evt.pageX)? evt.pageX: evt.clientX + getScrollX();
}

function getMouseY(evt) {
	return (evt.pageY)? evt.pageY: evt.clientY + getScrollY();
}