/*
   ========================================================
        script: image-flow
        author: Gerard Ferrandez - [Ge1doot]
          date: March 15, 2008
           maj: May 24, 2008 - AJAXification bank images
          site: http://www.dhteumeuleu.com
       license: CC-BY-NC - do not remove this notice
   ========================================================
*/

var imf = function () {
        /* //////////// ==== private methods ==== //////////// */
        var lf = 0;
        var instances = [];
        /* ===== read file ==== */
        var AJAX = (function(AJAX){
                return function(url){
                        var ajax = AJAX();
                        ajax.open("GET", url, false);
                        ajax.send("");
                        return ajax;
                };
        })(this.XMLHttpRequest ?
                function() {return new XMLHttpRequest;} :
                function() {return new ActiveXObject("Microsoft.XMLHTTP");}
        );
        /* ===== custom getElementsByClass ==== */
        function getElementsByClass (object, tag, className) {
                var o = object.getElementsByTagName(tag);
                for ( var i = 0, n = o.length, ret = []; i < n; i++)
                        if (o[i].className == className) ret.push(o[i]);
                if (ret.length == 1) ret = ret[0];
                return ret;
        }
        /* ===== crossbrowsers addEvent ==== */
        function addEvent (o, e, f) {
                if (window.addEventListener) o.addEventListener(e, f, false);
                else if (window.attachEvent) r = o.attachEvent('on' + e, f);
        }
        /* ===== create image reflexion ==== */
        function createReflexion (cont, img) {
                var flx = false;
                if (document.createElement("canvas").getContext) {
                        /* ---- canvas ---- */
                        flx = document.createElement("canvas");
                        flx.width = img.width;
                        flx.height = img.height;
                        var context = flx.getContext("2d");
                        context.translate(0, img.height);
                        context.scale(1, -1);
                        context.drawImage(img, 0, 0, img.width, img.height);
                        flx.style.opacity = '0.35';
                } else {
                        /* ---- DXImageTransform ---- */
                        flx     = document.createElement('img');
                        flx.src = img.src;
                        flx.style.filter = 'flipv progid:DXImageTransform.Microsoft.Alpha(' +
                                           'opacity=50, style=1, finishOpacity=0, startx=0, starty=0, finishx=0, finishy=' +
                                                           (img.height * .25) + ')';
                }
                /* ---- insert Reflexion ---- */
                flx.style.position = 'absolute';
                flx.style.left     = '-4000px';
                cont.appendChild(flx);
                return flx;
        }
        /* //////////// ==== ImageFlow Constructor ==== //////////// */
        function ImageFlow(oCont, xmlfile, horizon, size, zoom, border, start, interval) {
                this.diapos     = [];
                this.scr        = false;
                this.size       = size;
                this.zoom       = zoom;
                this.horizon    = horizon;
                this.bdw        = border;
                this.oCont      = oCont;
                this.oc         = document.getElementById(oCont);
                this.scrollbar  = getElementsByClass(this.oc,   'div', 'scrollbar');
                this.text       = getElementsByClass(this.oc,   'div', 'text');
                this.title      = getElementsByClass(this.text, 'div', 'title');
                this.legend     = getElementsByClass(this.text, 'div', 'legend');
                this.bar        = getElementsByClass(this.oc,   'img', 'bar');
                this.arL        = getElementsByClass(this.oc,   'img', 'arrow-left');
                this.arR        = getElementsByClass(this.oc,   'img', 'arrow-right');
                this.bw         = this.bar.width;
                this.alw        = this.arL.width - 5;
                this.arw        = this.arR.width - 5;
                this.bar.parent = this.oc.parent  = this;
                this.arL.parent = this.arR.parent = this;
                this.view       = this.back       = -1;
                this.time_start = start * 62.5 || 0;
                this.time_inter = interval * 62.5 || 0;
                this.time_out   = this.time_start;
                this.time       = 0;
                this.time_dir   = 1;
                this.resize();
                this.oc.onselectstart = function () { return false; }
                /* ---- parse xml ---- */
                var bank = AJAX(xmlfile).responseXML.getElementsByTagName("bank").item(0).getElementsByTagName("img");
                this.NF = bank.length;
                for (var i = 0; i < this.NF; i++) {
                        var img = bank.item(i);
                        var val = function (tag) {
                                return img.getElementsByTagName(tag).length ?
                                        img.getElementsByTagName(tag).item(0).firstChild.nodeValue : false;
                        }
                        /* ---- create images ---- */
                        this.diapos[i] = new Diapo(this, i, val("src"), val("title"), val("caption"), val("link"), val("target") || '_self');
                }
                /* ==== add mouse wheel events ==== */
                if (window.addEventListener)
                        this.oc.addEventListener('DOMMouseScroll', function(e) {
                                this.parent.scroll(-e.detail);
                                return false;
                        }, false);
                this.oc.onmousewheel = function () {
                        this.parent.scroll(event.wheelDelta);
                        return false;
                }
                /* ==== scrollbar drag N drop ==== */
                this.bar.onmousedown = function (e) {
                        if (!e) e = window.event;
                        var scl = e.screenX - this.offsetLeft;
                        var self = this.parent;
                        /* ---- move bar ---- */
                        this.parent.oc.onmousemove = function (e) {
                                if (!e) e = window.event;
                                self.bar.style.left = Math.round(Math.min((self.ws - self.arw - self.bw), Math.max(self.alw, e.screenX - scl))) + 'px';
                                self.view = Math.round(((e.screenX - scl) ) / (self.ws - self.alw - self.arw - self.bw) * (self.NF-1));
                                if (self.view != self.back) self.calc();
                                return false;
                        }
                        /* ---- release scrollbar ---- */
                        this.parent.oc.onmouseup = function (e) {
                                self.oc.onmousemove = null;
                                return false;
                        }
                        return false;
                }
                /* ==== right arrow ==== */
                this.arR.onclick = this.arR.ondblclick = function () {
                        if (this.parent.view < this.parent.NF - 1)
                                this.parent.calc(1);
                }
                /* ==== Left arrow ==== */
                this.arL.onclick = this.arL.ondblclick = function () {
                        if (this.parent.view > 0)
                                this.parent.calc(-1);
                }
        }
        /* //////////// ==== ImageFlow prototype ==== //////////// */
        ImageFlow.prototype = {
                /* ==== targets ==== */
                calc : function (inc) {
                        if (inc) {
                                this.view += inc;
                                /* ---- stop autoscroll ---- */
                                this.time = 0;
                                this.time_out = this.time_start;
                        }
                        var tw = 0;
                        var lw = 0;
                        var o = this.diapos[this.view];
                        if (o && o.loaded) {
                                /* ---- reset ---- */
                                var ob = this.diapos[this.back];
                                if (ob && ob != o) {
                                        ob.img.className = 'diapo';
                                        ob.z1 = 1;
                                }
                                /* ---- update legend ---- */
                                this.title.innerHTML = o.title;
                                this.legend.innerHTML = o.text;
                                /* ---- update hyperlink ---- */
                                if (o.url) {
                                        o.img.className = 'diapo link';
                                        window.status = 'hyperlink: ' + o.url;
                                } else {
                                        o.img.className = 'diapo';
                                        window.status = '';
                                }
                                /* ---- calculate target sizes & positions ---- */
                                if(o.r < 1) o.w1 = Math.min(o.iw, this.wh * .8, Math.round(this.ht * this.horizon / o.r)) * o.z1;
                                else o.w1 = Math.round(this.ht * this.horizon / o.r) * o.z1;
                                var x0 = o.x1 = (this.wh * .5) - (o.w1 * .5);
                                var x = x0 + o.w1 + this.bdw;
                                for (var i = this.view + 1, o; o = this.diapos[i]; i++) {
                                        if (o.loaded) {
                                                o.x1 = x;
                                                o.w1 = (this.ht / o.r) * this.size;
                                                x   += o.w1 + this.bdw;
                                                tw  += o.w1 + this.bdw;
                                        }
                                }
                                x = x0 - this.bdw;
                                for (var i = this.view - 1, o; o = this.diapos[i]; i--) {
                                        if (o.loaded) {
                                                o.w1 = (this.ht / o.r) * this.size;
                                                o.x1 = x - o.w1;
                                                x   -= o.w1 + this.bdw;
                                                tw  += o.w1 + this.bdw;
                                                lw  += o.w1 + this.bdw;
                                        }
                                }
                                /* ---- move scrollbar ---- */
                                if (!this.scr && tw) {
                                        var r = (this.ws - this.alw - this.arw - this.bw) / tw;
                                        this.bar.style.left = Math.round(this.alw + lw * r) + 'px';
                                }
                                /* ---- save preview view ---- */
                                this.back = this.view;
                        }
                },
                /* ==== mousewheel scrolling ==== */
                scroll : function (sc) {
                        if (sc < 0) {
                                if (this.view < this.NF - 1) this.calc(1);
                        } else {
                                if (this.view > 0) this.calc(-1);
                        }
                },
                /* ==== resize  ==== */
                resize : function () {
                        this.wh = this.oc.clientWidth;
                        this.ht = this.oc.clientHeight;
                        this.ws = this.scrollbar.offsetWidth;
                        this.calc();
                        this.run(true);
                },
                /* ==== animation loop ==== */
                run : function (res) {
                        /* ---- move all images ---- */
                        var i = this.NF;
                        while (i--) this.diapos[i].move(res);
                        /* ---- autoscroll ---- */
                        if (this.time_out) {
                                this.time++;
                                if (this.time > this.time_out) {
                                        this.view += this.time_dir;
                                        if (this.view >= this.NF || this.view < 0) {
                                                this.time_dir = -this.time_dir;
                                                this.view += this.time_dir * 2;
                                        }
                                        this.calc();
                                        this.time = 0;
                                        this.time_out = this.time_inter;
                                }
                        }
                }
        }
        /* //////////// ==== Diapo Constructor ==== //////////// */
        Diapo = function (parent, N, src, title, text, url, target) {
                this.parent        = parent;
                this.loaded        = false;
                this.title         = title;
                this.text          = text;
                this.url           = url;
                this.target        = target;
                this.N             = N;
                this.img           = document.createElement('img');
                this.img.src       = src;
                this.img.parent    = this;
                this.img.className = 'diapo';
                this.x0            = this.parent.oc.clientWidth;
                this.x1            = this.x0;
                this.w0            = 0;
                this.w1            = 0;
                this.z1            = 1;
                this.z2            = 0;
                this.img.parent    = this;
                this.img.onclick   = function() { this.parent.click(); }
                this.parent.oc.appendChild(this.img);
                /* ---- display external link ---- */
                if (url) {
                        this.img.onmouseover = function () { this.className = 'diapo link';        }
                        this.img.onmouseout  = function () { this.className = 'diapo'; }
                }
        }
        /* //////////// ==== Diapo prototype ==== //////////// */
        Diapo.prototype = {
                /* ==== HTML rendering ==== */
                move : function (res) {
                        var that = this.parent;
                        if (this.loaded) {
                                var sx = this.x1 - this.x0;
                                var sw = this.w1 - this.w0;
                                if (Math.abs(sx) > 2 || Math.abs(sw) > 2 || res) {
                                        /* ---- paint only when moving ---- */
                                        this.x0 += sx * .1;
                                        this.w0 += sw * .1;
                                        var h = this.w0 * this.r;
                                        this.z2 = Math.ceil((that.ht * that.horizon + 1 - this.z2 - h) *.5);
                                        if (this.x0 < that.wh && this.x0 + this.w0 > 0) {
                                                /* ---- paint only visible images ---- */
                                                this.visible = true;
                                                var o = this.img.style;
                                                /* ---- diapo ---- */
                                                o.left   = Math.floor(this.x0) + 'px';
                                                o.bottom = Math.floor(that.ht * (1 - that.horizon) + this.z2) + 'px';
                                                o.width  = Math.floor(this.w0) + 'px';
                                                o.height = Math.floor(h) + 'px';
                                                /* ---- reflexion ---- */
                                                if (this.flx) {
                                                        var o = this.flx.style;
                                                        o.left   = Math.floor(this.x0) + 'px';
                                                        o.top    = Math.ceil(that.ht * that.horizon + 1 - this.z2) + 'px';
                                                        o.width  = Math.floor(this.w0) + 'px';
                                                        o.height = Math.floor(h) + 'px';
                                                }
                                        } else {
                                                /* ---- disable invisible images ---- */
                                                if (this.visible) {
                                                        this.visible = false;
                                                        this.img.style.width = '0px';
                                                        if (this.flx) this.flx.style.width = '0px';
                                                }
                                        }
                                }
                        } else {
                                /* ==== image onload ==== */
                                if (this.img.complete && this.img.width) {
                                        /* ---- get size image ---- */
                                        this.iw     = this.img.width;
                                        this.ih     = this.img.height;
                                        this.r      = this.ih / this.iw;
                                        this.loaded = true;
                                        /* ---- create reflexion ---- */
                                        this.flx    = createReflexion(that.oc, this.img);
                                        if (that.view < 0) that.view = this.N;
                                        else if (this.N == 0) that.view = this.N;
                                        that.calc();
                                }
                        }
                },
                /* ==== diapo onclick ==== */
                click : function () {
                        /* ---- stop autoscroll ---- */
                        this.parent.time = 0;
                        this.parent.time_out = this.parent.time_start;
                        if (this.parent.view == this.N) {
                                /* ---- click on zoomed diapo ---- */
                                if (this.url) {
                                        /* ---- open hyperlink ---- */
                                        window.open(this.url, this.target);
                                } else {
                                        /* ---- zoom in/out ---- */
                                        this.z1 = this.z1 == 1 ? this.parent.zoom : 1;
                                        this.parent.calc();
                                }
                        } else {
                                /* ---- select diapo ---- */
                                this.parent.view = this.N;
                                this.parent.calc();
                        }
                        return false;
                }
        }
        /* //////////// ==== public methods ==== //////////// */
        return {
                /* ==== initialize script ==== */
                create : function (div, xmlfile, horizon, size, zoom, border, start, interval) {
                        /* ---- instanciate imageFlow ---- */
                        var load = function () {
                                var loaded = false;
                                var i = instances.length;
                                while (i--) if (instances[i].oCont == div) loaded = true;
                                if (!loaded) {
                                        /* ---- push new imageFlow instance ---- */
                                        instances.push(
                                                new ImageFlow(div, xmlfile, horizon, size, zoom, border, start, interval)
                                        );
                                        /* ---- init script (once) ---- */
                                        if (!imf.initialized) {
                                                imf.initialized = true;
                                                /* ---- window resize event ---- */
                                                addEvent(window, 'resize', function () {
                                                        var i = instances.length;
                                                        while (i--) instances[i].resize();
                                                });
                                                /* ---- stop drag N drop ---- */
                                                addEvent(document.getElementById(div), 'mouseout', function (e) {
                                                        if (!e) e = window.event;
                                                        var tg = e.relatedTarget || e.toElement;
                                                        if (tg && tg.tagName == 'HTML') {
                                                                var i = instances.length;
                                                                while (i--) instances[i].oc.onmousemove = null;
                                                        }
                                                        return false;
                                                });
                                                /* ---- set interval loop ---- */
                                                setInterval(function () {
                                                        var i = instances.length;
                                                        while (i--) instances[i].run();
                                                }, 16);
                                        }
                                }
                        }
                        /* ---- window onload event ---- */
                        addEvent(window, 'load', function () { load(); });
                }
        }
}();

/* ==== create imageFlow ==== */
//          div ID, imagesbank, horizon, size, zoom, border, autoscroll_start, autoscroll_interval
imf.create("imageFlow", 'image-flow.xml', 0.75, 0.15, 1.8, 10, 4, 1);