// -------------------------------------------------------------------
// gAjax RSS Pausing Scroller- By Dynamic Drive, available at: http://www.dynamicdrive.com
// Created: Aug 2nd, 2007 Updated: n/a
// REQUIRES: gfeedfetcher.js class, available at http://dynamicdrive.com/dynamicindex18/gajaxrssdisplayer.htm
// -------------------------------------------------------------------

var gfeedfetcher_loading_image = "indicator.gif" //Specify full URL to "loading" image. Overwrites same var from gfeedfetcher.js


function gfeedpausescroller(divid, divClass, delay, linktarget) {
    this.tickerid = divid //ID of outermost scroller div
    this.delay = parseInt(delay) //Default delay between msg change, in miliseconds.
    this.mouseoverBol = 0 //Boolean to indicate whether mouse is currently over scroller (and pause it if it is)
    this.hiddendivpointer = 1 //index of RSS feed array's entry for hidden div
    this.itemsperpage = 1 //Entries to show per page
    document.write('<div id="' + divid + '" class="' + divClass + '" style="position: relative; overflow: hidden">')
    document.write('<div class="innerDiv" style="position: absolute; width: 100%" id="' + divid + '1"><span style="position: absolute">Initializing RSS scroller...</span></div>')
    document.write('<div class="innerDiv" style="position: absolute; width: 100%; visibility: hidden" id="' + divid + '2"></div>')
    gfeedfetcher.call(this, divid + "unneeded", divClass + "unneeded", linktarget) //inherit properties from "gfeedfetcher" class, but feed it bogus ID/Class, as we won't be using the DIV generated by "gfeedfetcher"
    document.write('</div>')
    this.itemcontainer = "<div>" //default element wrapping around each RSS entry
    this.feedcontainer.style.display = "none" //Hide unneeded div generated after inheriting properties from "gfeedfetcher" class
    this.feedcontainer = document.getElementById(divid + '1') //overwrite inherited "feedcontainer" to reference the first DIV within scroller container
    this.tickerdiv = document.getElementById(divid)
    this.visiblediv = document.getElementById(divid + "1")
    this.hiddendiv = document.getElementById(divid + "2")
    this.visibledivtop = parseInt(this.tickerdiv.currentStyle ? this.tickerdiv.currentStyle["paddingTop"] : window.getComputedStyle ? window.getComputedStyle(this.tickerdiv, "").getPropertyValue("padding-top") : 0) //Determine the "top" boundary of the visible div, factoring in any CSS padding
    this.tickerdivwidth = this.tickerdiv.currentStyle ? parseInt(this.tickerdiv.currentStyle["width"]) : this.tickerdiv.offsetWidth //IE has trouble getting offsetWidth while page is loading, so use global CSS value instead
    this.tickerdivheight = this.tickerdiv.currentStyle ? parseInt(this.tickerdiv.currentStyle["height"]) + 50 : 0 //IE has trouble getting offsetWidth while page is loading, so use global CSS value instead. "50" accounts for any possible padding skewing things. Variable used by any other browser.
}

gfeedpausescroller.prototype = new gfeedfetcher //inherit methods from gfeedfetcher class
gfeedpausescroller.prototype.constructor = gfeedpausescroller
gfeedpausescroller.prototype._displayresult = null //Remove inherited method "_displayresult()"


// -------------------------------------------------------------------
// entries_per_page()- Sets the number of RSS entries to display per page (at once)
// -------------------------------------------------------------------

gfeedpausescroller.prototype.entries_per_page = function(num) {
    this.itemsperpage = num
}

// -------------------------------------------------------------------
// _signaldownloadcomplete()- Signals to the rest of the script when the fetching of all RSS feeds is complete
// -------------------------------------------------------------------

gfeedpausescroller.prototype._signaldownloadcomplete = function() { //overwrite inherited method "_signaldownloadcomplete()"
    this.feedsfetched += 1
    if (this.feedsfetched == this.feedurls.length) //if all feeds fetched
        this._populateticker(this.feeds) //Populate the two DIVs within scroller with the fetched data
}

// -------------------------------------------------------------------
// _populateticker()- Pre-populates the two DIVs of the scroller with the 1st and 2nd RSS entries.
// -------------------------------------------------------------------

gfeedpausescroller.prototype._populateticker = function(feeds) {
    gfeedfetcher._sortarray(feeds, this.sortstring)
    //set width of inner DIVs to outer DIV's width minus padding (padding assumed to be top padding x 2)
    this.visiblediv.style.width = this.hiddendiv.style.width = parseInt(this.tickerdivwidth) - (this.visibledivtop * 2) + "px"
    this.itemsperpage = (this.itemsperpage >= feeds.length) ? 1 : this.itemsperpage //Adjust "itemsperpage" if needed (based on total # of avail entries)
    var feedslice1 = feeds.slice(0, this.itemsperpage) //Get subsection of feed array based on how many entries to show at once
    this.hiddendivpointer = this.itemsperpage //Set the feed array index of the hidden div accordingly
    var feedslice2 = feeds.slice(this.hiddendivpointer, this.hiddendivpointer + this.itemsperpage)
    this.visiblediv.innerHTML = formatrssmessage(feedslice1, this.showoptions, this.itemcontainer, this.linktarget)
    this.hiddendiv.innerHTML = formatrssmessage(feedslice2, this.showoptions, this.itemcontainer, this.linktarget)
    this._initscroller()
}


// -------------------------------------------------------------------
// _initscroller()- Initialize the scroller by setting initial positions of the two dinner DIVs, start up down animation
// -------------------------------------------------------------------

gfeedpausescroller.prototype._initscroller = function() {
    var scrollerinstance = this
    this.getinline(this.visiblediv, this.hiddendiv)
    this.hiddendiv.style.visibility = "visible"
    //set width of inner DIVs to outer DIV's width minus padding (padding assumed to be top padding x 2)
    this.visiblediv.style.width = this.hiddendiv.style.width = parseInt(this.tickerdivwidth) - (this.visibledivtop * 2) + "px"
    this.tickerdiv.onmouseover = function() { scrollerinstance.mouseoverBol = 1 }
    this.tickerdiv.onmouseout = function() { scrollerinstance.mouseoverBol = 0 }
    if (window.attachEvent) //Clean up loose references in IE
        window.attachEvent("onunload", function() { scrollerinstance.tickerdiv.onmouseover = scrollerinstance.tickerdiv.onmouseout = null })
    setTimeout(function() { scrollerinstance._animateup() }, this.delay)
}


// -------------------------------------------------------------------
// formatrssmessage()- Global function that formats a RSS entry(s) to the desired components (title, date, description etc)
// -------------------------------------------------------------------

function formatrssmessage(feedslice, showoptions, itemcontainer, linktarget) {
    var rssoutput = (itemcontainer == "<li>") ? "<ul>\n" : "" //if "itemcontainer" is set to "<li>", define a "<ul>" tag to wrap around the result
    for (var i = 0; i < feedslice.length; i++) { //Loop through the entered slice of a RSS feed (1 or more entries)
        var itemtitle = "<a href=\"" + feedslice[i].link + "\" target=\"" + linktarget + "\" class=\"titlefield\">" + feedslice[i].title + "</a>"
        var itemlabel = /label/i.test(showoptions) ? '<span class="labelfield">[' + feedslice[i].ddlabel + ']</span>' : " "
        var itemdate = gfeedfetcher._formatdate(feedslice[i].publishedDate, showoptions)
        var itemdescription = /description/i.test(showoptions) ? "<br />" + feedslice[i].content : /snippet/i.test(showoptions) ? "<br />" + feedslice[i].contentSnippet : ""
        rssoutput += itemcontainer + itemtitle + " " + itemlabel + " " + itemdate + "\n" + itemdescription + itemcontainer.replace("<", "</") + "\n\n"
    }
    rssoutput += (itemcontainer == "<li>") ? "</ul>\n" : ""
    return rssoutput
}


// -------------------------------------------------------------------
// _animateup()- Move the two inner divs of the scroller up and in sync
// -------------------------------------------------------------------

gfeedpausescroller.prototype._animateup = function() {
    var scrollerinstance = this
    if (parseInt(this.hiddendiv.style.top) > (this.visibledivtop + 5)) {
        this.visiblediv.style.top = parseInt(this.visiblediv.style.top) - 5 + "px"
        this.hiddendiv.style.top = parseInt(this.hiddendiv.style.top) - 5 + "px"
        setTimeout(function() { scrollerinstance._animateup() }, 40)
    }
    else {
        this.getinline(this.hiddendiv, this.visiblediv)
        this._swapdivs()
        setTimeout(function() { scrollerinstance._rotatemessage() }, this.delay)
    }
}


// -------------------------------------------------------------------
// _swapdivs()- Swap between which is the visible and which is the hidden div
// -------------------------------------------------------------------

gfeedpausescroller.prototype._swapdivs = function() {
    var tempcontainer = this.visiblediv
    this.visiblediv = this.hiddendiv
    this.hiddendiv = tempcontainer
}

gfeedpausescroller.prototype.getinline = function(div1, div2) {
    div1.style.top = this.visibledivtop + "px"
    div2.style.top = Math.max(div1.parentNode.offsetHeight || this.tickerdivheight, div1.offsetHeight) + "px"
}


// -------------------------------------------------------------------
// _rotatemessage()- Populate the hidden div with the next message before it's visible
// -------------------------------------------------------------------

gfeedpausescroller.prototype._rotatemessage = function() {
    var scrollerinstance = this
    if (this.mouseoverBol == 1) //if mouse is currently over scoller, do nothing (pause it)
        setTimeout(function() { scrollerinstance._rotatemessage() }, 100)
    else {
        var i = this.hiddendivpointer
        var ceiling = this.feeds.length
        this.hiddendivpointer = (i + this.itemsperpage > ceiling - 1) ? 0 : i + this.itemsperpage
        var feedslice = this.feeds.slice(this.hiddendivpointer, this.hiddendivpointer + this.itemsperpage)
        this.hiddendiv.innerHTML = formatrssmessage(feedslice, this.showoptions, this.itemcontainer, this.linktarget)
        this._animateup()
    }
}