Chris@76: function smf_NewsFader(oOptions)
Chris@76: {
Chris@76: 	this.opt = oOptions;
Chris@76: 
Chris@76: 	this.oFaderHandle = document.getElementById(this.opt.sFaderControlId);
Chris@76: 
Chris@76: 	// Fade from... what text color? Default to black.
Chris@76: 	this.oFadeFrom = 'oFadeFrom' in this.opt ? this.opt.oFadeFrom : {
Chris@76: 		r: 0,
Chris@76: 		g: 0,
Chris@76: 		b: 0
Chris@76: 	};
Chris@76: 
Chris@76: 	// To which background color? Default to white.
Chris@76: 	this.oFadeTo = 'oFadeTo' in this.opt ? this.opt.oFadeTo : {
Chris@76: 		r: 255,
Chris@76: 		g: 255,
Chris@76: 		b: 255
Chris@76: 	};
Chris@76: 
Chris@76: 	// Surround each item with... anything special?
Chris@76: 	this.sItemTemplate = 'sItemTemplate' in this.opt ? this.opt.sItemTemplate : '%1$s';
Chris@76: 
Chris@76: 	// Fade delay (in milliseconds).
Chris@76: 	this.iFadeDelay = 'iFadeDelay' in this.opt ? this.opt.iFadeDelay : 5000;
Chris@76: 
Chris@76: 	// The array that contains all the lines of the news for display.
Chris@76: 	this.aFaderItems = 'aFaderItems' in this.opt ? this.opt.aFaderItems : [];
Chris@76: 
Chris@76: 	// Should we look for fader data, still?
Chris@76: 	this.bReceivedItemsOnConstruction = 'aFaderItems' in this.opt;
Chris@76: 
Chris@76: 	// The current item in smfFadeContent.
Chris@76: 	this.iFadeIndex = -1;
Chris@76: 
Chris@76: 	// Percent of fade (-64 to 510).
Chris@76: 	this.iFadePercent = 510
Chris@76: 
Chris@76: 	// Direction (in or out).
Chris@76: 	this.bFadeSwitch = false;
Chris@76: 
Chris@76: 	// Just make sure the page is loaded before calling the init.
Chris@76: 	setTimeout(this.opt.sSelf + '.init();', 1);
Chris@76: }
Chris@76: 
Chris@76: smf_NewsFader.prototype.init = function init()
Chris@76: {
Chris@76: 	var oForeEl, oForeColor, oBackEl, oBackColor;
Chris@76: 
Chris@76: 	// Try to find the fore- and background colors.
Chris@76: 	if ('currentStyle' in this.oFaderHandle)
Chris@76: 	{
Chris@76: 		oForeColor = this.oFaderHandle.currentStyle.color.match(/#([\da-f][\da-f])([\da-f][\da-f])([\da-f][\da-f])/);
Chris@76: 		this.oFadeFrom = {
Chris@76: 			r: parseInt(oForeColor[1]),
Chris@76: 			g: parseInt(oForeColor[2]),
Chris@76: 			b: parseInt(oForeColor[3])
Chris@76: 		};
Chris@76: 
Chris@76: 		oBackEl = this.oFaderHandle;
Chris@76: 		while (oBackEl.currentStyle.backgroundColor == 'transparent' && 'parentNode' in oBackEl)
Chris@76: 			oBackEl = oBackEl.parentNode;
Chris@76: 
Chris@76: 		oBackColor = oBackEl.currentStyle.backgroundColor.match(/#([\da-f][\da-f])([\da-f][\da-f])([\da-f][\da-f])/);
Chris@76: 		this.oFadeTo = {
Chris@76: 			r: eval('0x' + oBackColor[1]),
Chris@76: 			g: eval('0x' + oBackColor[2]),
Chris@76: 			b: eval('0x' + oBackColor[3])
Chris@76: 		};
Chris@76: 	}
Chris@76: 	else if (!('opera' in window) && 'defaultView' in document)
Chris@76: 	{
Chris@76: 		oForeEl = this.oFaderHandle;
Chris@76: 		while (document.defaultView.getComputedStyle(oForeEl, null).getPropertyCSSValue('color') == null && 'parentNode' in oForeEl && 'tagName' in oForeEl.parentNode)
Chris@76: 			oForeEl = oForeEl.parentNode;
Chris@76: 
Chris@76: 		oForeColor = document.defaultView.getComputedStyle(oForeEl, null).getPropertyValue('color').match(/rgb\((\d+), (\d+), (\d+)\)/);
Chris@76: 		this.oFadeFrom = {
Chris@76: 			r: parseInt(oForeColor[1]),
Chris@76: 			g: parseInt(oForeColor[2]),
Chris@76: 			b: parseInt(oForeColor[3])
Chris@76: 		};
Chris@76: 
Chris@76: 		oBackEl = this.oFaderHandle;
Chris@76: 		while (document.defaultView.getComputedStyle(oBackEl, null).getPropertyCSSValue('background-color') == null && 'parentNode' in oBackEl && 'tagName' in oBackEl.parentNode)
Chris@76: 			oBackEl = oBackEl.parentNode;
Chris@76: 
Chris@76: 		oBackColor = document.defaultView.getComputedStyle(oBackEl, null).getPropertyValue('background-color');
Chris@76: 		this.oFadeTo = {
Chris@76: 			r: parseInt(oBackColor[1]),
Chris@76: 			g: parseInt(oBackColor[2]),
Chris@76: 			b: parseInt(oBackColor[3])
Chris@76: 		};
Chris@76: 	}
Chris@76: 
Chris@76: 	// Did we get our fader items on construction, or should we be gathering them instead?
Chris@76: 	if (!this.bReceivedItemsOnConstruction)
Chris@76: 	{
Chris@76: 		// Get the news from the list in boardindex
Chris@76: 		var oNewsItems = this.oFaderHandle.getElementsByTagName('li');
Chris@76: 
Chris@76: 		// Fill the array that has previously been created
Chris@76: 		for (var i = 0, n = oNewsItems.length; i < n; i ++)
Chris@76: 			this.aFaderItems[i] = oNewsItems[i].innerHTML;
Chris@76: 	}
Chris@76: 
Chris@76: 	// The ranges to fade from for R, G, and B. (how far apart they are.)
Chris@76: 	this.oFadeRange = {
Chris@76: 		'r': this.oFadeFrom.r - this.oFadeTo.r,
Chris@76: 		'g': this.oFadeFrom.g - this.oFadeTo.g,
Chris@76: 		'b': this.oFadeFrom.b - this.oFadeTo.b
Chris@76: 	};
Chris@76: 
Chris@76: 	// Divide by 20 because we are doing it 20 times per one ms.
Chris@76: 	this.iFadeDelay /= 20;
Chris@76: 
Chris@76: 	// Start the fader!
Chris@76: 	window.setTimeout(this.opt.sSelf + '.fade();', 20);
Chris@76: }
Chris@76: 
Chris@76: // Main	fading function... called 50 times every second.
Chris@76: smf_NewsFader.prototype.fade = function fade()
Chris@76: {
Chris@76: 	if (this.aFaderItems.length <= 1)
Chris@76: 		return;
Chris@76: 
Chris@76: 	// A fix for Internet Explorer 4: wait until the document is loaded so we can use setInnerHTML().
Chris@76: 	if ('readyState' in document && document.readyState != 'complete')
Chris@76: 	{
Chris@76: 		window.setTimeout(this.opt.sSelf + '.fade();', 20);
Chris@76: 		return;
Chris@76: 	}
Chris@76: 
Chris@76: 	// Starting out?  Set up the first item.
Chris@76: 	if (this.iFadeIndex == -1)
Chris@76: 	{
Chris@76: 		setInnerHTML(this.oFaderHandle, this.sItemTemplate.replace('%1$s', this.aFaderItems[0]));
Chris@76: 		this.iFadeIndex = 1;
Chris@76: 
Chris@76: 		// In Mozilla, text jumps around from this when 1 or 0.5, etc...
Chris@76: 		if ('MozOpacity' in this.oFaderHandle.style)
Chris@76: 			this.oFaderHandle.style.MozOpacity = '0.90';
Chris@76: 		else if ('opacity' in this.oFaderHandle.style)
Chris@76: 			this.oFaderHandle.style.opacity = '0.90';
Chris@76: 		// In Internet Explorer, we have to define this to use it.
Chris@76: 		else if ('filter' in this.oFaderHandle.style)
Chris@76: 			this.oFaderHandle.style.filter = 'alpha(opacity=100)';
Chris@76: 	}
Chris@76: 
Chris@76: 	// Are we already done fading in?  If so, fade out.
Chris@76: 	if (this.iFadePercent >= 510)
Chris@76: 		this.bFadeSwitch = !this.bFadeSwitch;
Chris@76: 
Chris@76: 	// All the way faded out?
Chris@76: 	else if (this.iFadePercent <= -64)
Chris@76: 	{
Chris@76: 		this.bFadeSwitch = !this.bFadeSwitch;
Chris@76: 
Chris@76: 		// Go to the next item, or first if we're out of items.
Chris@76: 		setInnerHTML(this.oFaderHandle, this.sItemTemplate.replace('%1$s', this.aFaderItems[this.iFadeIndex ++]));
Chris@76: 		if (this.iFadeIndex >= this.aFaderItems.length)
Chris@76: 			this.iFadeIndex = 0;
Chris@76: 	}
Chris@76: 
Chris@76: 	// Increment or decrement the fade percentage.
Chris@76: 	if (this.bFadeSwitch)
Chris@76: 		this.iFadePercent -= 255 / this.iFadeDelay * 2;
Chris@76: 	else
Chris@76: 		this.iFadePercent += 255 / this.iFadeDelay * 2;
Chris@76: 
Chris@76: 	// If it's not outside 0 and 256... (otherwise it's just delay time.)
Chris@76: 	if (this.iFadePercent < 256 && this.iFadePercent > 0)
Chris@76: 	{
Chris@76: 		// Easier... also faster...
Chris@76: 		var tempPercent = this.iFadePercent / 255, rounded;
Chris@76: 
Chris@76: 		if ('MozOpacity' in this.oFaderHandle.style)
Chris@76: 		{
Chris@76: 			rounded = Math.round(tempPercent * 100) / 100;
Chris@76: 			this.oFaderHandle.style.MozOpacity = rounded == 1 ? '0.99' : rounded;
Chris@76: 		}
Chris@76: 		else if ('opacity' in this.oFaderHandle.style)
Chris@76: 		{
Chris@76: 			rounded = Math.round(tempPercent * 100) / 100;
Chris@76: 			this.oFaderHandle.style.opacity = rounded == 1 ? '0.99' : rounded;
Chris@76: 		}
Chris@76: 		else
Chris@76: 		{
Chris@76: 			var done = false;
Chris@76: 			if ('alpha' in this.oFaderHandle.filters)
Chris@76: 			{
Chris@76: 				try
Chris@76: 				{
Chris@76: 					this.oFaderHandle.filters.alpha.opacity = Math.round(tempPercent * 100);
Chris@76: 					done = true;
Chris@76: 				}
Chris@76: 				catch (err)
Chris@76: 				{
Chris@76: 				}
Chris@76: 			}
Chris@76: 
Chris@76: 			if (!done)
Chris@76: 			{
Chris@76: 				// Get the new R, G, and B. (it should be bottom + (range of color * percent)...)
Chris@76: 				var r = Math.ceil(this.oFadeTo.r + this.oFadeRange.r * tempPercent);
Chris@76: 				var g = Math.ceil(this.oFadeTo.g + this.oFadeRange.g * tempPercent);
Chris@76: 				var b = Math.ceil(this.oFadeTo.b + this.oFadeRange.b * tempPercent);
Chris@76: 
Chris@76: 				// Set the color in the style, thereby fading it.
Chris@76: 				this.oFaderHandle.style.color = 'rgb(' + r + ', ' + g + ', ' + b + ')';
Chris@76: 			}
Chris@76: 		}
Chris@76: 	}
Chris@76: 
Chris@76: 	// Keep going.
Chris@76: 	window.setTimeout(this.opt.sSelf + '.fade();', 20);
Chris@76: }