/*fader.js

 * by Peter Belesis. v3.0 991130

 * Copyright (c) 1999 Peter Belesis. All Rights Reserved.

 * Originally published and documented at http://www.dhtmlab.com/

 * License to use is granted if and only if this entire copyright notice

 * is included.

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

*/



//3.0 added more browser checks:

NS4 = (document.layers);

IE4 = (document.all);



appVer = navigator.appVersion;

IEmac = (IE4 && appVer.indexOf("Mac") != -1);

IE4mac = (IEmac && appVer.indexOf("MSIE 4") != -1);

IE40mac = (IE4mac && appVer.indexOf("4.0;") != -1);

IE45mac = (IE4mac && appVer.indexOf("4.5;") != -1);

NSpre401 = (NS4 && (parseFloat(appVer) <= 4.01));

NSpre403 = (NS4 && (parseFloat(appVer) <= 4.03));



//3.0 added next 2 line for backward compatibility

FDRjustFlip = (window.FDRjustFlip) ? FDRjustFlip : false;

FDRhdlineCount = (window.FDRhdlineCount) ? FDRhdlineCount : 1;



FDRfinite = (FDRmaxLoops > 0);

FDRisOver = false;

FDRloadCount = 0;



//3.0 set blendTimer to null for IE40mac

blendTimer = null;



if (!window.prefix) prefix = "";

window.onload = FDRcountLoads;



//3.0 modified NS-only code to account for flipper and lack of NS onload/onerror handlers

if (NS4) {

        if(FDRjustFlip || NSpre403) {

                totalLoads = 1;

                FDRfadeImg = new Object();

                FDRfadeImg.width = FDRboxWid - (FDRborWid*2);;

        }

        else {

                totalLoads = 2;

                FDRfadeImg = new Image();

                FDRfadeImg.onload = FDRcountLoads;

                FDRfadeImg.onerror = FDRcountLoads;

                FDRfadeImg.src = FDRgifSrc;

        }

}



//3.0 added event argument for NS

function FDRcountLoads(e) {

        if (IE4) {

                setTimeout("FDRinit()",1);

        }

        else {

//3.0 check for event type

                if(e.type == "error") FDRjustFlip = true; 

                FDRloadCount++;

                if (FDRloadCount==totalLoads) {

                        origWidth = innerWidth;

                        origHeight = innerHeight;

                        window.onresize = function(){

                                if (innerWidth==origWidth && innerHeight==origHeight) return;

                                location.reload();

                        }

                        FDRinit();

                }

        }

}



function FDRinit(){

        if(!window.arNews) {

                if(!window.arTXT || !window.arURL) return;

                if(arTXT.length != arURL.length) return;

                arNews = [];

                for (i=0;i<arTXT.length;i++){

                        arNews[arNews.length] = arTXT[i];

                        arNews[arNews.length] = arURL[i];

                }

        }



    if (NS4) {

        if (!document.elFader) return;

                with(document.classes.newslink.A) {

                        textDecoration = FDRlnkDec;

                        color = FDRlnkCol;

                        fontWeight = FDRfntWgh;

                        fontSize = FDRfntSiz;

                        fontStyle = FDRfntSty;

                        fontFamily = FDRfntFam;

                        lineHeight = FDRlinHgt;

                        textAlign = FDRtxtAln;

                }

                with(document.classes.nolink.P) {

                        color = FDRfntCol;

                        fontWeight = FDRfntWgh;

                        fontSize = FDRfntSiz;

                        fontStyle = FDRfntSty;

                        fontFamily = FDRfntFam;

                        lineHeight = FDRlinHgt;

                        textAlign = FDRtxtAln;

                }

        elFader = document.elFader;

                with (elFader) {

                        document.write(" ");

                        document.close();

                        bgColor = FDRborCol;

                        clip.width = FDRboxWid;

                        clip.height = FDRboxHgt;

                }



                contWidth = FDRboxWid - (FDRborWid*2);

                contHeight = FDRboxHgt - (FDRborWid*2);

                elCont = new Layer(contWidth,elFader);

                with (elCont) {

                        top = FDRborWid;

                        left = FDRborWid;

                        clip.width = contWidth;

                        clip.height = contHeight;

                        bgColor = FDRbackCol;

                        visibility = "inherit";

                }



                newsWidth = contWidth - (FDRboxPad*2);

                newsHeight = contHeight - (FDRboxPad*2);

        elNews = new Layer(newsWidth,elCont);

                with (elNews) {

                        top = FDRboxPad;

                        left = FDRboxPad;

                        clip.width = newsWidth ;

                        clip.height = newsHeight;

                }



//3.0 made NS GIF use conditional on flipper choice             

                if (!FDRjustFlip) {

                        elGif = new Layer(contWidth,elCont); 

                imStr = "<IMG SRC='" + FDRgifSrc +"' WIDTH="+ Math.max(FDRfadeImg.width,(FDRboxWid - (FDRborWid*2)));

//3.0 onError handler added to in-line GIF code for NS 4.03-

                        imStr += (NSpre403) ? " onError='window.FDRjustFlip = true'>" : ">";

                with (elGif) {

                                document.write(imStr);

                        document.close();

                                moveAbove(elNews);

                        }

        

                        imgHeight = elGif.document.height;

                        slideInc = (imgHeight/(FDRblendDur*1000/FDRgifInt));

                        startTop = -(imgHeight - FDRboxHgt);

                }



                elFader.visibility =  "show";

    }

    else {

        if (!window.elFader) return;

                elFader.innerHTML ="";

                if(IE4mac) {

                        document.body.insertAdjacentHTML("BeforeBegin","<STYLE></STYLE>");

                }

                else {

                        if (!document.styleSheets.length) document.createStyleSheet();

                }

                with (document.styleSheets(document.styleSheets.length-1)) {

                        addRule("A.newslink","text-decoration:"+FDRlnkDec+";color:"+ FDRlnkCol);

                        addRule("A.newslink:hover","color:"+ FDRhovCol);

                }



                with (elFader.style) {

//3.0 added box width/height adjustments for IEmac

                        errorOffset = (IE4mac) ? (FDRboxPad + FDRborWid) : 0;

                        width = FDRboxWid - (errorOffset * 2);

                        height = FDRboxHgt - (errorOffset * 2);

                        if(IE4mac && !IE45mac){

                                pixelLeft = elFader.offsetLeft + errorOffset;

                                pixelTop = elFader.offsetTop + errorOffset;

                        }



                        backgroundColor = FDRbackCol;

                        overflow = "hidden";

                        color = FDRfntCol;

                        fontWeight = FDRfntWgh;

                        fontSize = FDRfntSiz;

                        fontStyle = FDRfntSty;

                        fontFamily = FDRfntFam;

                        lineHeight = FDRlinHgt;

                        textAlign = FDRtxtAln;

                        cursor = "default";

                        visibility = "visible";

                        borderWidth = FDRborWid;

                        borderStyle = FDRborSty;

                        borderColor = FDRborCol;

                        padding  = FDRboxPad;



//3.0 filter application conditional on fader use

                        if(!FDRjustFlip) filter = "blendTrans(duration=" + FDRblendDur + ")";

                }

                elFader.onselectstart = function(){return false};



                IEhasFilters = (elFader.filters.blendTrans) ? true : false;



    }



//3.0 NS mouseover/out handlers applied only in 4.02+

        if (!NSpre401) {

                elFader.onmouseover = function (){

                        FDRisOver = true;

                }

                elFader.onmouseout = function(){

                        FDRisOver = false;

                        status = "";

                }

        }

        

        FDRstart(0);

}



function FDRstart(ind){

    newsCount = ind;

    if (FDRfinite) loopCount = 0;

    FDRdo();

    blendTimer = setInterval("FDRdo()",FDRblendInt*1000)

}



function FDRdo() {

//3.0 check for blendTimer value for IE40mac:

        if(!blendTimer && loopCount>0) return;



    if (FDRfinite && loopCount==FDRmaxLoops) {

        FDRend();

                return;

    }

        FDRfade();

//3.0 omitted next line; newsCount incremented elsewhere

//    newsCount += 2;



    if (newsCount == arNews.length) {

        newsCount = 0;

        if (FDRfinite) loopCount++;

    }

}



//3.0 added function for display string creation

function FDRmakeStr(){

        tempStr = "";

        for (i=0;i<FDRhdlineCount;i++){

                if(newsCount>=arNews.length)break;

                dispStr = arNews[newsCount];

                linkStr = arNews[newsCount+1];

                isLink = linkStr.length;

                if (isLink) {

                        tempStr += "<P><A CLASS=newslink "

                                        + "HREF='" + prefix + linkStr + "'>"

                            + dispStr + "</A></P>"

                }

                else {

                        tempStr += ((NS4) ? "<P CLASS=nolink>" : "<P>") +dispStr+"</P>";



                }

        if(IE40mac) tempStr +="<BR>";

                newsCount += 2;

        }

        return tempStr;

}



function FDRfade(){

//3.0 newsStr now created in other function and returned here

        newsStr = FDRmakeStr();



    if (NS4) {

//3.0 made GIF manipulation conditional on fader use

                if (!FDRjustFlip) {

                        elGif.top = startTop;

                        elGif.visibility = "inherit";

                }



                elNews.visibility = "hide";

        with (elNews.document) {

            write(newsStr);

            close();

        }

                elNews.visibility = "inherit";

    }

    else {

        if(IEhasFilters)elFader.filters.blendTrans.Apply();

        elFader.innerHTML = newsStr;

        if(IEhasFilters)elFader.filters.blendTrans.Play();

    }



//3.0 status bar display now only when single headline displayed

        if(FDRhdlineCount==1) window.status = (FDRisOver && isLink) ? (prefix + linkStr) : "";



//3.0 NS GIF sliding condiional on fader use

    if (NS4 && !FDRjustFlip) FDRslide();

}



function FDRslide(){

    elGif.top += slideInc;

    if (elGif.top >= 0) {elGif.visibility = "hide";return}

    setTimeout("FDRslide()",FDRgifInt);

}



//3.0 new function for NS to avoid literal function declaration

//    and allow double-click for 4.01a- versions

function FDRdblClickNS(){

        elFader.releaseEvents(Event.DBLCLICK);

        FDRstart(startIndex);

        return false;

}



function FDRend(){

        clearInterval(blendTimer);



//3.0 set blendTimer to null for IE40mac

        blendTimer = null;



        if (FDRendWithFirst) {

                newsCount = 0;

                FDRfade();

        }

        if (FDRreplayOnClick) {



//3.0 startIndex dependent on headline count

                startIndex = FDRendWithFirst ? (FDRhdlineCount * 2) : 0;

                if (IE4) {

                        elFader.title = "Double click to replay";

                        elFader.ondblclick = function(){

                                this.ondblclick = null;

                                this.title = "";

                                FDRstart(startIndex);

                        }

                }

                else {

                        elFader.captureEvents(Event.DBLCLICK);



//3.0 moved handler to new function

                        elFader.ondblclick = FDRdblClickNS;



                }

    }

}