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/* USAGE:
$(function(){
var steps = new Stepper("#steps");
steps.addSlide(1, function(){ this.canvas.text("slide 1"); });
steps.addSlide(2, function(){ this.canvas.text("slide 2"); });
steps.go();
});
*/
(function(){
var slice = [].slice;
var extend = function(to, source){
for(var i in source) to[i] = source[i];
return to;
};
var prefix = function(key, nodot){
var css = 'stepper-' + key.replace(/\s+/g, '_');
return nodot ? css : '.' + css;
};
var make = function(tag, css, children){
var el = $('<' + tag + ' />').attr({'class': prefix(css, true)});
if(children) el.append.apply(el, children);
return el;
};
var bind = function(cb, scope){
return function(){ return cb.apply(scope, slice.call(arguments)); };
};
var Node = function(key, cb){
this.key = key;
this.cb = cb;
this.next = null;
this.prev = null;
};
var Stepper = this.Stepper = function(selector){
this.el = $($(selector).get(0));
this._buildCanvas();
this.slides = {};
this.length = 0;
};
Stepper.prototype = extend(Stepper.prototype, {
_buildCanvas : function(){
this.canvas = make('div', 'canvas');
this.toggle = make('div', 'toggle', [make('a', 'next').attr('href', '#')]);
this.toggle.find(prefix('next')).text('next').bind('click', bind(this.next, this));
this.el.append(this.toggle);
this.el.append(this.canvas);
var methods = ["start", "stop", "next"];
for(var i in methods)
this[methods[i]] = bind(this[methods[i]], this);
},
addSlide : function(key, cb){
var node = new Node(key, cb);
this.current = (this.current || node);
this.slides[key] = node;
if(!(this.head || this.tail)){
this.head = this.tail = node;
} else {
node.prev = this.tail;
this.tail.next = node;
this.tail = node;
}
this.tail.next = this.head;
this.head.prev = this.tail;
var el = make('a', key).attr('href', '#');
el.text(key);
this.toggle.find(prefix('next')).before(el);
el.bind('click', bind(function(e){
e.preventDefault();
if(this.paused) return;
this.clear();
this.current = node;
this.toggle.children().removeClass(prefix('active', true));
el.addClass(prefix('active', true));
node.cb.apply(this, slice.call(arguments));
}, this));
this.length++;
return this;
},
getSlide : function(key){
return this.slides[key];
},
stop : function(){
this.toggle.addClass(prefix('grayed', true))
this.paused = true;
},
start : function(){
this.toggle.removeClass(prefix('grayed', true))
this.paused = false;
},
clear : function(){
this.canvas.html("");
},
_activate : function(node){
if(this.paused) return false;
this.toggle.find(prefix(node.key)).trigger('click');
return node;
},
next : function(){
this._activate(this.current.next);
return false;
},
go : function(){
return this._activate(this.head);
}
});
})();
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