/**
 *
 * copyright (c) 2009 may(qq104010230)
 * http://www.winwill.com
 * http://www.winwill.com/jquery/jscroll.html
 * admin@winwill.com
 */
/*--------------------------------------------------------------------------------------------------*/
$j.fn.extend({//添加滚轮事件//by jun
    mousewheel: function (func) {
        return this.each(function () {
            var _self = this;
            _self.d = 0;//滚动方向
            if ($j.browser.msie || $j.browser.safari) {
                _self.onmousewheel = function () { _self.d = event.wheeldelta; event.returnvalue = false; func && func.call(_self); };
            } else {
                _self.addeventlistener("dommousescroll", function (e) {
                    _self.d = e.detail > 0 ? -1 : 1;
                    e.preventdefault();
                    func && func.call(_self);
                }, false);
            }
        });
    }
});
$j.fn.extend({
    jscroll: function (j) {
        return this.each(function () {
            j = j || {}
            j.bar = j.bar || {};//2级对象
            j.btn = j.btn || {};//2级对象
            j.bar.bg = j.bar.bg || {};//3级对象
            j.bar.bd = j.bar.bd || {};//3级对象
            j.btn.ubg = j.btn.ubg || {};//3级对象
            j.btn.dbg = j.btn.dbg || {};//3级对象
            var jun = {
                w: "15px"
						, bgurl: ""
						, bg: "rgba(230, 230, 230, 1 )"
						, bar: {
						    pos: "up"
								, bd: { out: "#b5b5b5", hover: "#ccc" }
								, bg: { out: "#bebebe", hover: "#fff", focus: "orange" }
						}
						, btn: {
						    btn: true
								, ubg: { out: "#ccc", hover: "#fff", focus: "orange" }
								, dbg: { out: "#ccc", hover: "#fff", focus: "orange" }
						}
						, fn: function () { }
            }
            j.w = j.w || jun.w;
            j.bgurl = j.bgurl || jun.bgurl;
            j.bg = j.bg || jun.bg;
            j.bar.pos = j.bar.pos || jun.bar.pos;
            j.bar.bd.out = j.bar.bd.out || jun.bar.bd.out;
            j.bar.bd.hover = j.bar.bd.hover || jun.bar.bd.hover;
            j.bar.bg.out = j.bar.bg.out || jun.bar.bg.out;
            j.bar.bg.hover = j.bar.bg.hover || jun.bar.bg.hover;
            j.bar.bg.focus = j.bar.bg.focus || jun.bar.bg.focus;
            j.btn.btn = j.btn.btn != undefined ? j.btn.btn : jun.btn.btn;
            j.btn.ubg.out = j.btn.ubg.out || jun.btn.ubg.out;
            j.btn.ubg.hover = j.btn.ubg.hover || jun.btn.ubg.hover;
            j.btn.ubg.focus = j.btn.ubg.focus || jun.btn.ubg.focus;
            j.btn.dbg.out = j.btn.dbg.out || jun.btn.dbg.out;
            j.btn.dbg.hover = j.btn.dbg.hover || jun.btn.dbg.hover;
            j.btn.dbg.focus = j.btn.dbg.focus || jun.btn.dbg.focus;
            j.fn = j.fn || jun.fn;
            var _self = this;
            var stime, sp = 0, isup = 0;
            $j(_self).css({ overflow: "hidden", position: "absolute", padding: "1px" });
            var dw = $j(_self).width(), dh = $j(_self).height() - 1;
            var sw = j.w ? parseint(j.w) : 21;
            var sl = dw - sw
            var bw = j.btn.btn == true ? sw : 0;
            if ($j(_self).children(".jscroll-c").height() == null) {//存在性检测
                $j(_self).wrapinner("<div class='jscroll-c' style='top:0px;z-index:9999;zoom:1;position:relative'></div>");
                $j(_self).children(".jscroll-c").prepend("<div style='height:0px;overflow:hidden'></div>");
                $j(_self).append("<div class='jscroll-e' unselectable='on' style=' height:100%;top:0px;right:3px;-moz-user-select:none;position:absolute;z-index:9999;'><div class='jscroll-u' style='position:absolute;top:0px;width:100%;left:0;background:blue;overflow:hidden;cursor: pointer;'></div><div class='jscroll-h'  unselectable='on' style='background:green;position:absolute;left:0;-moz-user-select:none;border:1px solid;cursor: pointer;'></div><div class='jscroll-d' style='position:absolute;bottom:0px;width:100%;left:0;background:blue;overflow:hidden'></div></div>");
            }
            var jscrollc = $j(_self).children(".jscroll-c");
            var jscrolle = $j(_self).children(".jscroll-e");
            var jscrollh = jscrolle.children(".jscroll-h");
            var jscrollu = jscrolle.children(".jscroll-u");
            var jscrolld = jscrolle.children(".jscroll-d");
            if ($j.browser.msie) { document.execcommand("backgroundimagecache", false, true); }
            jscrollc.css({ "padding-right": sw });
            jscrolle.css({ width: sw, background: j.bg, "background-image": j.bgurl });
            jscrollh.css({ top: bw, background: j.bar.bg.out, "background-image": j.bgurl, "border-color": j.bar.bd.out, width: "4px", marginleft: "-2px", borderradius: "19px" });
            jscrollu.css({ height: bw, background:j.bg, "background-image": j.bgurl });
            jscrolld.css({ height: bw, background: j.btn.dbg.out, "background-image": j.bgurl });
            jscrollh.hover(function () { if (isup == 0) $j(this).css({ background: j.bar.bg.hover, "background-image": j.bgurl, "border-color": j.bar.bd.hover }) }, function () { if (isup == 0) $j(this).css({ background: j.bar.bg.out, "background-image": j.bgurl, "border-color": j.bar.bd.out }) })
            jscrollu.hover(function () { if (isup == 0) $j(this).css({ background: j.btn.ubg.hover, "background-image": j.bgurl }) }, function () { if (isup == 0) $j(this).css({ background: j.btn.ubg.out, "background-image": j.bgurl }) })
            jscrolld.hover(function () { if (isup == 0) $j(this).css({ background: j.btn.dbg.hover, "background-image": j.bgurl }) }, function () { if (isup == 0) $j(this).css({ background: j.btn.dbg.out, "background-image": j.bgurl }) })
            var sch = jscrollc.height();
            //var sh = math.pow(dh,2) / sch ;//math.pow(x,y)x的y次方
            var sh = (dh - 2 * bw) * dh / sch
            if (sh < 10) { sh = 10 }
            var wh = sh / 6//滚动时候跳动幅度
            //	sh = parseint(sh);
            var curt = 0, allows = false;
            jscrollh.height(sh);
            if (sch <= dh) { jscrollc.css({ padding: 0 }); jscrolle.css({ display: "none" }) } else { allows = true; }
            if (j.bar.pos != "up") {
                curt = dh - sh - bw;
                sett();
            }
            jscrollh.bind("mousedown", function (e) {
                j['fn'] && j['fn'].call(_self);
                isup = 1;
                jscrollh.css({ background: j.bar.bg.focus, "background-image": j.bgurl })
                var pagey = e.pagey, t = parseint($j(this).css("top"));
                $j(document).mousemove(function (e2) {
                    curt = t + e2.pagey - pagey;//pagey浏览器可视区域鼠标位置，screeny屏幕可视区域鼠标位置
                    sett();
                });
                $j(document).mouseup(function () {
                    isup = 0;
                    jscrollh.css({ background: j.bar.bg.out, "background-image": j.bgurl, "border-color": j.bar.bd.out })
                    $j(document).unbind();
                });
                return false;
            });
            jscrollu.bind("mousedown", function (e) {
                j['fn'] && j['fn'].call(_self);
                isup = 1;
                jscrollu.css({ background: j.btn.ubg.focus, "background-image": j.bgurl })
                _self.timesett("u");
                $j(document).mouseup(function () {
                    isup = 0;
                    jscrollu.css({ background: j.btn.ubg.out, "background-image": j.bgurl })
                    $j(document).unbind();
                    cleartimeout(stime);
                    sp = 0;
                });
                return false;
            });
            jscrolld.bind("mousedown", function (e) {
                j['fn'] && j['fn'].call(_self);
                isup = 1;
                jscrolld.css({ background: j.btn.dbg.focus, "background-image": j.bgurl })
                _self.timesett("d");
                $j(document).mouseup(function () {
                    isup = 0;
                    jscrolld.css({ background: j.btn.dbg.out, "background-image": j.bgurl })
                    $j(document).unbind();
                    cleartimeout(stime);
                    sp = 0;
                });
                return false;
            });
            _self.timesett = function (d) {
                var self = this;
                if (d == "u") { curt -= wh; } else { curt += wh; }
                sett();
                sp += 2;
                var t = 500 - sp * 50;
                if (t <= 0) { t = 0 };
                stime = settimeout(function () { self.timesett(d); }, t);
            }
            jscrolle.bind("mousedown", function (e) {
                j['fn'] && j['fn'].call(_self);
                curt = curt + e.pagey - jscrollh.offset().top - sh / 2;
                asett();
                return false;
            });
            function asett() {
                if (curt < bw) { curt = bw; }
                if (curt > dh - sh - bw) { curt = dh - sh - bw; }
                jscrollh.stop().animate({ top: curt }, 100);
                var sct = -((curt - bw) * sch / (dh - 2 * bw));
                jscrollc.stop().animate({ top: sct }, 1000);
            };
            function sett() {
                if (curt < bw) { curt = bw; }
                if (curt > dh - sh - bw) { curt = dh - sh - bw; }
                jscrollh.css({ top: curt });
                var sct = -((curt - bw) * sch / (dh - 2 * bw));
                jscrollc.css({ top: sct });
            };
            $j(_self).mousewheel(function () {
                if (allows != true) return;
                j['fn'] && j['fn'].call(_self);
                if (this.d > 0) { curt -= wh; } else { curt += wh; };
                sett();
            })
        });
    }
});