unslider.js源码

/**
 *   Unslider by @idiot
 */
 
(function($, f) {
    //  If there's no jQuery, Unslider can't work, so kill the operation.
    if(!$) return f;
    
    var Unslider = function() {
        //  Set up our elements
        this.el = f;
        this.items = f;
        
        //  Dimensions
        this.sizes = [];
        this.max = [0,0];
        
        //  Current inded
        this.current = 0;
        
        //  Start/stop timer
        this.interval = f;
                
        //  Set some options
        this.opts = {
            speed: 500,
            delay: 3000, // f for no autoplay
            complete: f, // when a slide's finished
            keys: !f, // keyboard shortcuts - disable if it breaks things
            dots: f, // display ••••o• pagination
            fluid: f // is it a percentage width?,
        };
        
        //  Create a deep clone for methods where context changes
        var _ = this;

        this.init = function(el, opts) {
            this.el = el;
            this.ul = el.children('ul');
            this.max = [el.outerWidth(), el.outerHeight()];            
            this.items = this.ul.children('li').each(this.calculate);
            
            //  Check whether we're passing any options in to Unslider
            this.opts = $.extend(this.opts, opts);
            
            //  Set up the Unslider
            this.setup();
            
            return this;
        };
        
        //  Get the width for an element
        //  Pass a jQuery element as the context with .call(), and the index as a parameter: Unslider.calculate.call($('li:first'), 0)
        this.calculate = function(index) {
            var me = $(this),
                width = me.outerWidth(), height = me.outerHeight();
            
            //  Add it to the sizes list
            _.sizes[index] = [width, height];
            
            //  Set the max values
            if(width > _.max[0]) _.max[0] = width;
            if(height > _.max[1]) _.max[1] = height;
        };
        
        //  Work out what methods need calling
        this.setup = function() {
            //  Set the main element
            this.el.css({
                overflow: 'hidden',
                 _.max[0],
                height: this.items.first().outerHeight()
            });
            
            //  Set the relative widths
            this.ul.css({ (this.items.length * 100) + '%', position: 'relative'});
            this.items.css('width', (100 / this.items.length) + '%');
            
            if(this.opts.delay !== f) {
                this.start();
                this.el.hover(this.stop, this.start);
            }
            
            //  Custom keyboard support
            this.opts.keys && $(document).keydown(this.keys);
            
            //  Dot pagination
            this.opts.dots && this.dots();
            
            //  Little patch for fluid-width sliders. Screw those guys.
            if(this.opts.fluid) {
                var resize = function() {
                    _.el.css('width', Math.min(Math.round((_.el.outerWidth() / _.el.parent().outerWidth()) * 100), 100) + '%');
                };
                
                resize();
                $(window).resize(resize);
            }
            
            if(this.opts.arrows) {
                this.el.parent().append('<p class="arrows"><span class="prev">←</span><span class="next">→</span></p>')
                    .find('.arrows span').click(function() {
                        $.isFunction(_[this.className]) && _[this.className]();
                    });
            };
            
            //  Swipe support
            if($.event.swipe) {
                this.el.on('swipeleft', _.prev).on('swiperight', _.next);
            }
        };
        
        //  Move Unslider to a slide index
        this.move = function(index, cb) {
            //  If it's out of bounds, go to the first slide
            if(!this.items.eq(index).length) index = 0;
            if(index < 0) index = (this.items.length - 1);
            
            var target = this.items.eq(index);
            var obj = {height: target.outerHeight()};
            var speed = cb ? 5 : this.opts.speed;
            
            if(!this.ul.is(':animated')) {            
                //  Handle those pesky dots
                _.el.find('.dot:eq(' + index + ')').addClass('active').siblings().removeClass('active');

                this.el.animate(obj, speed) && this.ul.animate($.extend({left: '-' + index + '00%'}, obj), speed, function(data) {
                    _.current = index;
                    $.isFunction(_.opts.complete) && !cb && _.opts.complete(_.el);
                });
            }
        };
        
        //  Autoplay functionality
        this.start = function() {
            _.interval = setInterval(function() {
                _.move(_.current + 1);
            }, _.opts.delay);
        };
        
        //  Stop autoplay
        this.stop = function() {
            _.interval = clearInterval(_.interval);
            return _;
        };
        
        //  Keypresses
        this.keys = function(e) {
            var key = e.which;
            var map = {
                //  Prev/next
                37: _.prev,
                39: _.next,
                
                //  Esc
                27: _.stop
            };
            
            if($.isFunction(map[key])) {
                map[key]();
            }
        };
        
        //  Arrow navigation
        this.next = function() { return _.stop().move(_.current + 1) };
        this.prev = function() { return _.stop().move(_.current - 1) };
        
        this.dots = function() {
            //  Create the HTML
            var html = '<ol class="dots">';
                $.each(this.items, function(index) { html += '<li class="dot' + (index < 1 ? ' active' : '') + '">' + (index + 1) + '</li>'; });
                html += '</ol>';
            
            //  Add it to the Unslider
            this.el.addClass('has-dots').append(html).find('.dot').click(function() {
                _.move($(this).index());
            });
        };
    };
    
    //  Create a jQuery plugin
    $.fn.unslider = function(o) {
        var len = this.length;
        
        //  Enable multiple-slider support
        return this.each(function(index) {
            //  Cache a copy of $(this), so it 
            var me = $(this);
            var instance = (new Unslider).init(me, o);
            
            //  Invoke an Unslider instance
            me.data('unslider' + (len > 1 ? '-' + (index + 1) : ''), instance);
        });
    };
})(window.jQuery, false);