/*
 *   smallsilder jquery plugin
 *   $document : jquery.smallslider.js$
 *   $created on : 2009-7-3, 12:56:26$
 *   $last update: 2010-3-15, 12:20:22$
 *   $description
 *   jquery plugin for switch images, please open me with utf-8 encoding
 *   created under ubuntu 9.10 os , if you open it with notepad , some black square will appears !
 *
 *   $version : 0.4$
 */ (function ($) {

    $.smallslider = function (elm, options) {

        // this 为当前的 smallslider 对象，为了区别，使用 _this 替换
        var _this = this;
        _this.elm = elm; // elm 为当前的 dom 对象，即使用 class="smallslider" 的那个div对象。
        _this.$elm = $(elm); // $elm 为 elm 对象的 jquery 形式 
        _this.opts = $.extend({}, $.smallslider.defaults, options);
        _this.slidertimer = null;

        // 初始化对象
        _this.init = function () {
            _this.$ul = _this.$elm.find('>ul'); // 为子元素 ul
            _this.$lis = _this.$elm.find('li'); // 为所有 ul 下子元素 li 数组
            _this.$ims = _this.$elm.find('img'); // 为所有 li 下子元素 img 数组
            _this.itemnums = _this.$lis.length;
            _this.width = _this.$elm.width();
            _this.height = _this.$elm.height();
            _this.current = 0; // 当前的 index 索引

            if (_this.itemnums > 1) {
                if (_this.opts.switcheffect == 'ease') {
                    _this.$ul.css({
                        position: 'absolute',
                        left: 0,
                        top: 0
                    });
                    if (_this.opts.switchpath == 'left') {
                        var width = _this.itemnums * _this.width;
                        _this.$lis.css({
                            'float': 'left'
                        });
                        _this.$ul.css({
                            'width': width
                        });
                    } else if (_this.opts.switchpath == 'up') {
                        var height = _this.itemnums * _this.height;
                        _this.$ul.css({
                            'height': height
                        });
                    }
                } else if (_this.opts.switcheffect == 'fadeout') {
                    _this.$ul.css({
                        position: 'relative'
                    });
                    _this.$lis.css({
                        position: 'absolute',
                        zindex: 1
                    }).eq(0).css({
                        zindex: 2
                    });
                }
                if (_this.opts.showbuttons) {
                    _this.createbuttons(); // 创建按钮。
                }
                if (_this.opts.showtext) {
                    _this.createtext(); // 创建文字显示。
                }
                if (_this.opts.autostart) {
                    _this.startslider(1);
                }
                if (_this.opts.onimagestop) {
                    _this.onimage();
                }
            }
        };
        _this.createbuttons = function () {
            var buttons = '';
            for (var i = 1; i <= _this.itemnums; i++) {
                buttons += '<span>' + i + '</span>';
            }
            buttons = '<div class="smallslider-btns">' + buttons + '</div>';
            var left = 0,
                right = 0,
                top = 0,
                bottom = 0;
            var style_btns = {};
            switch (_this.opts.buttonposition) {
                case 'lefttop':
                    left = _this.opts.buttonoffsetx;
                    top = _this.opts.buttonoffsety;
                    style_btns = {
                        left: left + 'px',
                        top: top + 'px'
                    };
                    break;
                case 'righttop':
                    right = _this.opts.buttonoffsetx;
                    top = _this.opts.buttonoffsety;
                    style_btns = {
                        right: right + 'px',
                        top: top + 'px'
                    };
                    break;
                case 'rightbottom':
                    right = _this.opts.buttonoffsetx;
                    bottom = _this.opts.buttonoffsety;
                    style_btns = {
                        right: right + 'px',
                        bottom: bottom + 'px'
                    };
                    break;
                case 'leftbottom':
                    left = _this.opts.buttonoffsetx;
                    bottom = _this.opts.buttonoffsety;
                    style_btns = {
                        left: left + 'px',
                        bottom: bottom + 'px'
                    };
                    break;
            }
            $(buttons).css(style_btns).appendto(_this.$elm);
            _this.$btns = _this.$elm.find('span');
            _this.$elm.find('span:not(:first)').css({
                marginleft: _this.opts.buttonspace + 'px'
            });
            _this.$btns.removeclass('current-btn');
            _this.$btns.eq(0).addclass('current-btn');
            if (_this.opts.switchmode == 'click') {
                _this.$btns.click(function () {
                    var ix = _this.$btns.index($(this));
                    _this.slideto(ix); // 表示需要切换到哪一张
                });
            } else if (_this.opts.switchmode == 'hover') {
                _this.$btns.hover(function () {
                    var ix = _this.$btns.index($(this));
                    _this.slideto(ix);
                });
            }
        };

        // 创建标题标签
        _this.createtext = function () {
            var style_tex = {};
            switch (_this.opts.buttonposition) {
                case 'lefttop':
                    style_tex = {
                        left: 0,
                        top: 0,
                        textalign: 'right'
                    };
                    _this.textposition = 'top';
                    break;
                case 'righttop':
                    style_tex = {
                        left: 0,
                        top: 0,
                        textalign: 'left'
                    };
                    _this.textposition = 'top';
                    break;
                case 'rightbottom':
                    style_tex = {
                        left: 0,
                        bottom: 0,
                        textalign: 'left'
                    };
                    _this.textposition = 'bottom';
                    break;
                case 'leftbottom':
                    style_tex = {
                        left: 0,
                        bottom: 0,
                        textalign: 'right'
                    };
                    _this.textposition = 'bottom';
                    break;
            }
            if (_this.opts.textposition) {
                switch (_this.opts.textposition) {
                    case 'top':
                        style_tex.left = 0;
                        style_tex.top = 0;
                        break;
                    case 'bottom':
                        style_tex.left = 0;
                        style_tex.bottom = 0;
                        break;
                }
                _this.textposition = _this.opts.textposition;
            }
            if (_this.opts.textalign) {
                style_tex.textalign = _this.opts.textalign;
            }
            $('<div class="smallslider-tex smallslider-lay"></div>').css(style_tex).css({
                opacity: 0.39
            }).appendto(_this.$elm);

            var tex0 = _this.$ims.eq(0).attr('alt');
            if (_this.opts.textlink) {
                tex0 = '<a href="' + _this.$ims.eq(0).parent('a').attr('href') + '">' + tex0 + '</a>';
            }
            $('<h3 class="smallslider-tex"></h3>').css(style_tex).html(tex0).appendto(_this.$elm);
            _this.$h3 = _this.$elm.find('h3');
            _this.$lay = _this.$elm.find('div.smallslider-lay');
            _this.$tex = _this.$elm.find('.smallslider-tex');
        };
        _this.onimage = function () {
            _this.$ims.hover(function () {
                _this.stopslider();
            }, function () {
                _this.slideto(_this.current + 1);
            });
        };

        _this.slideto = function (index) {
            _this.stopslider(); // 先清掉以前的 settimeout;
            if (index > _this.itemnums - 1) index = 0;
            if (index < 0) index = _this.itemnums - 1;
            // 切换表示当前元素
            _this.$lis.removeclass('current-li').eq(index).addclass('current-li');
            if (_this.opts.showbuttons) {
                _this.$btns.removeclass('current-btn');
                _this.$btns.eq(index).addclass('current-btn');
            }
            _this.slidetext(index);
            var chattr = '';
            var ic = 0;
            switch (_this.opts.switchpath) {
                case 'left':
                    chattr = 'left';
                    ic = _this.width;
                    break;
                case 'up':
                default:
                    chattr = 'top';
                    ic = _this.height;
                    break;
            }
            var icx = -1 * index * ic; // top 或 left 变化量
            var switchease = _this.opts.switchease;
            switch (_this.opts.switcheffect) {
                case 'fadeout':
                    _this.$lis.stop(true, false);
                    _this.$lis.css({
                        zindex: 1,
                        opacity: 1
                    }).hide();
                    _this.$lis.eq(_this.current).css({
                        zindex: 3
                    }).show();
                    _this.$lis.eq(index).css({
                        zindex: 2
                    }).show();
                    if (_this.current != index) {
                        _this.$lis.eq(_this.current).fadeout(_this.opts.switchtime, function () {
                            _this.$lis.css({
                                zindex: 1
                            });
                            _this.$lis.eq(index).css({
                                zindex: 3,
                                opacity: 1
                            }).show();
                        });
                    }
                    break;
                case 'ease':
                    _this.$ul.stop(true, false);
                    if (chattr == 'top') _this.$ul.animate({
                        top: icx
                    }, {
                        duration: _this.opts.switchtime,
                        easing: switchease,
                        complete: function () {}
                    });
                    else if (chattr == 'left') _this.$ul.animate({
                        left: icx
                    }, {
                        duration: _this.opts.switchtime,
                        easing: switchease,
                        complete: function () {}
                    });
                    break;
                case 'none':
                default:
                    _this.$lis.eq(_this.current).hide();
                    _this.$lis.eq(index).show();
                    break;
            }
            _this.current = index;
            _this.startslider(index + 1);
        };

        // 切换文字
        _this.slidetext = function (index) {
            if (_this.opts.showtext) {
                var tex = _this.$ims.eq(index).attr('alt');
                if (_this.opts.textlink) {
                    tex = '<a href="' + _this.$ims.eq(index).parent('a').attr('href') + '">' + tex + '</a>';
                }
                _this.$h3.html(tex);
                if (_this.opts.textswitch > 0) {
                    var t_path = _this.$h3.height();
                    var t_ani1 = {}, t_ani2 = {};
                    if (_this.textposition == 'top') {
                        t_ani1 = {
                            top: -1 * t_path
                        };
                        t_ani2 = {
                            top: 0
                        };
                    } else if (_this.textposition == 'bottom') {
                        t_ani1 = {
                            bottom: -1 * t_path
                        };
                        t_ani2 = {
                            bottom: 0
                        };
                    }
                    if (_this.opts.textswitch == 1) {
                        _this.$h3.stop(true, false).animate(t_ani1, {
                            duration: 200,
                            easing: 'easeoutquad'
                        }).animate(t_ani2, {
                            duration: 200,
                            easing: 'easeoutquad'
                        });
                    } else if (_this.opts.textswitch == 2) {
                        _this.$tex.stop(true, false).animate(t_ani1, {
                            duration: 200,
                            easing: 'easeoutquad'
                        }).animate(t_ani2, {
                            duration: 200,
                            easing: 'easeoutquad'
                        });
                        // _this.$lay.animate(t_ani1, {duration: 200, easing: 'easeoutquad'}).animate(t_ani2, {duration: 200, easing: 'easeoutquad'});
                    }
                }
            }
        };

        // 开始切换
        _this.startslider = function (index) {
            // 由第几个序号开始 初始为1
            var st = settimeout(function () {
                _this.slideto(index);
            }, _this.opts.time);
            _this.slidertimer = st;
        };
        // 停止切换
        _this.stopslider = function () {
            // if(_this.opts.switcheffect=='fadeout') _this.$lis.stop();
            // else if(_this.opts.switcheffect=='ease') _this.$ul.stop();
            if (_this.slidertimer) {
                cleartimeout(_this.slidertimer);
            }
            _this.slidertimer = null;
        };

        _this.init();
    };

    $.smallslider.defaults = {
        time: 3000, // 切换时间间隔，单位毫秒，1秒=1000毫秒
        autostart: true, // 是否自动开始播放
        onimagestop: false, // 鼠标放在图片上时，是否停止播放
        switchmode: 'hover', // 图片切换的方式，click为单击切换，hover为鼠标移动到按钮上时切换
        switcheffect: 'fadeout', // 切换特效，可选值为：fadeout，ease，none
        switchpath: 'left', // 切换的方向，可选值为：up ， left ，即向上，向左
        switchease: 'easeoutquart', // 可选值列表如下
        switchtime: 600, // 切换时间，单位毫秒，1秒=1000毫秒
        buttonposition: 'rightbottom', // 按钮位置表示，共有四个值：lefttop，leftbottom，righttop，rightbottom
        buttonoffsetx: 10, // 水平方向上的按钮偏移位置，指向中心部移动多少，这里是数值，不加px
        buttonoffsety: 4, // 竖直方向上的按钮偏移位置，指向中心部移动多少，这里是数值，不加px
        buttonspace: 4, // 按钮之间的间隔 单位为像素，但不要加px
        showtext: true, // 是否显示标题，如果不显示，则只显示按钮
        showbuttons: true, // 是否显示按钮，默认显示
        textlink: true, // 是否给显示的标题加上链接，如果为false，只显示标题，标题不可单击
        textswitch: 0, // 标题是否运动显示，如果为0则不动，1 标题动，2 标题和背景一起动
        textposition: 'bottom', // 标题栏的位置，默认为空，即和按钮的位置一致，取值 top , bottom
        textalign: 'left' // 标题栏取 top 或 bottom 时，有效，left, center, right
    };

    $.fn.smallslider = function (options) {
        // 遍历由 $.smallslider 类创建生成的 smallslider 对象。
        return this.each(function (i) {
            (new $.smallslider(this, options));
        });
    };

})(jquery);

$.smallslider.switcheases = ["easeinquad", "easeoutquad", "easeinoutquad", "easeincubic", "easeoutcubic", "easeinoutcubic", "easeinquart", "easeoutquart", "easeinoutquart", "easeinquint", "easeoutquint", "easeinoutquint", "easeinsine", "easeoutsine", "easeinoutsine", "easeinexpo", "easeoutexpo", "easeinoutexpo", "easeincirc", "easeoutcirc", "easeinoutcirc", "easeinelastic", "easeoutelastic", "easeinoutelastic", "easeinback", "easeoutback", "easeinoutback", "easeinbounce", "easeoutbounce", "easeinoutbounce"];

// t: current time, b: beginning value, c: change in value, d: duration
jquery.easing['jswing'] = jquery.easing['swing'];

jquery.extend(jquery.easing, {
    def: 'easeoutquad',
    swing: function (x, t, b, c, d) {
        // alert(jquery.easing.default);
        return jquery.easing[jquery.easing.def](x, t, b, c, d);
    },
    easeinquad: function (x, t, b, c, d) {
        return c * (t /= d) * t + b;
    },
    easeoutquad: function (x, t, b, c, d) {
        return -c * (t /= d) * (t - 2) + b;
    },
    easeinoutquad: function (x, t, b, c, d) {
        if ((t /= d / 2) < 1) return c / 2 * t * t + b;
        return -c / 2 * ((--t) * (t - 2) - 1) + b;
    },
    easeincubic: function (x, t, b, c, d) {
        return c * (t /= d) * t * t + b;
    },
    easeoutcubic: function (x, t, b, c, d) {
        return c * ((t = t / d - 1) * t * t + 1) + b;
    },
    easeinoutcubic: function (x, t, b, c, d) {
        if ((t /= d / 2) < 1) return c / 2 * t * t * t + b;
        return c / 2 * ((t -= 2) * t * t + 2) + b;
    },
    easeinquart: function (x, t, b, c, d) {
        return c * (t /= d) * t * t * t + b;
    },
    easeoutquart: function (x, t, b, c, d) {
        return -c * ((t = t / d - 1) * t * t * t - 1) + b;
    },
    easeinoutquart: function (x, t, b, c, d) {
        if ((t /= d / 2) < 1) return c / 2 * t * t * t * t + b;
        return -c / 2 * ((t -= 2) * t * t * t - 2) + b;
    },
    easeinquint: function (x, t, b, c, d) {
        return c * (t /= d) * t * t * t * t + b;
    },
    easeoutquint: function (x, t, b, c, d) {
        return c * ((t = t / d - 1) * t * t * t * t + 1) + b;
    },
    easeinoutquint: function (x, t, b, c, d) {
        if ((t /= d / 2) < 1) return c / 2 * t * t * t * t * t + b;
        return c / 2 * ((t -= 2) * t * t * t * t + 2) + b;
    },
    easeinsine: function (x, t, b, c, d) {
        return -c * math.cos(t / d * (math.pi / 2)) + c + b;
    },
    easeoutsine: function (x, t, b, c, d) {
        return c * math.sin(t / d * (math.pi / 2)) + b;
    },
    easeinoutsine: function (x, t, b, c, d) {
        return -c / 2 * (math.cos(math.pi * t / d) - 1) + b;
    },
    easeinexpo: function (x, t, b, c, d) {
        return (t == 0) ? b : c * math.pow(2, 10 * (t / d - 1)) + b;
    },
    easeoutexpo: function (x, t, b, c, d) {
        return (t == d) ? b + c : c * (-math.pow(2, -10 * t / d) + 1) + b;
    },
    easeinoutexpo: function (x, t, b, c, d) {
        if (t == 0) return b;
        if (t == d) return b + c;
        if ((t /= d / 2) < 1) return c / 2 * math.pow(2, 10 * (t - 1)) + b;
        return c / 2 * (-math.pow(2, -10 * --t) + 2) + b;
    },
    easeincirc: function (x, t, b, c, d) {
        return -c * (math.sqrt(1 - (t /= d) * t) - 1) + b;
    },
    easeoutcirc: function (x, t, b, c, d) {
        return c * math.sqrt(1 - (t = t / d - 1) * t) + b;
    },
    easeinoutcirc: function (x, t, b, c, d) {
        if ((t /= d / 2) < 1) return -c / 2 * (math.sqrt(1 - t * t) - 1) + b;
        return c / 2 * (math.sqrt(1 - (t -= 2) * t) + 1) + b;
    },
    easeinelastic: function (x, t, b, c, d) {
        var s = 1.70158;
        var p = 0;
        var a = c;
        if (t == 0) return b;
        if ((t /= d) == 1) return b + c;
        if (!p) p = d * .3;
        if (a < math.abs(c)) {
            a = c;
            s = p / 4;
        } else s = p / (2 * math.pi) * math.asin(c / a);
        return -(a * math.pow(2, 10 * (t -= 1)) * math.sin((t * d - s) * (2 * math.pi) / p)) + b;
    },
    easeoutelastic: function (x, t, b, c, d) {
        var s = 1.70158;
        var p = 0;
        var a = c;
        if (t == 0) return b;
        if ((t /= d) == 1) return b + c;
        if (!p) p = d * .3;
        if (a < math.abs(c)) {
            a = c;
            s = p / 4;
        } else s = p / (2 * math.pi) * math.asin(c / a);
        return a * math.pow(2, -10 * t) * math.sin((t * d - s) * (2 * math.pi) / p) + c + b;
    },
    easeinoutelastic: function (x, t, b, c, d) {
        var s = 1.70158;
        var p = 0;
        var a = c;
        if (t == 0) return b;
        if ((t /= d / 2) == 2) return b + c;
        if (!p) p = d * (.3 * 1.5);
        if (a < math.abs(c)) {
            a = c;
            s = p / 4;
        } else s = p / (2 * math.pi) * math.asin(c / a);
        if (t < 1) return -.5 * (a * math.pow(2, 10 * (t -= 1)) * math.sin((t * d - s) * (2 * math.pi) / p)) + b;
        return a * math.pow(2, -10 * (t -= 1)) * math.sin((t * d - s) * (2 * math.pi) / p) * .5 + c + b;
    },
    easeinback: function (x, t, b, c, d, s) {
        if (s == undefined) s = 1.70158;
        return c * (t /= d) * t * ((s + 1) * t - s) + b;
    },
    easeoutback: function (x, t, b, c, d, s) {
        if (s == undefined) s = 1.70158;
        return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
    },
    easeinoutback: function (x, t, b, c, d, s) {
        if (s == undefined) s = 1.70158;
        if ((t /= d / 2) < 1) return c / 2 * (t * t * (((s *= (1.525)) + 1) * t - s)) + b;
        return c / 2 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2) + b;
    },
    easeinbounce: function (x, t, b, c, d) {
        return c - jquery.easing.easeoutbounce(x, d - t, 0, c, d) + b;
    },
    easeoutbounce: function (x, t, b, c, d) {
        if ((t /= d) < (1 / 2.75)) {
            return c * (7.5625 * t * t) + b;
        } else if (t < (2 / 2.75)) {
            return c * (7.5625 * (t -= (1.5 / 2.75)) * t + .75) + b;
        } else if (t < (2.5 / 2.75)) {
            return c * (7.5625 * (t -= (2.25 / 2.75)) * t + .9375) + b;
        } else {
            return c * (7.5625 * (t -= (2.625 / 2.75)) * t + .984375) + b;
        }
    },
    easeinoutbounce: function (x, t, b, c, d) {
        if (t < d / 2) return jquery.easing.easeinbounce(x, t * 2, 0, c, d) * .5 + b;
        return jquery.easing.easeoutbounce(x, t * 2 - d, 0, c, d) * .5 + c * .5 + b;
    }
});