// Copyright: (c) 2006, Michal Tatarynowicz (tatarynowicz@gmail.com)
// Licenced as Public Domain (http://creativecommons.org/licenses/publicdomain/)
// $Id: jquery_std.js 568 2006-06-05 09:40:53Z Michał $


// Additions to the wonderful jQuery Javascript library


// basics

$.fn.first = function() {
	return this.cur[0];
}

$.fn.last = function() {
	return this.cur[this.size()-1];
}


// form handling

$.fn.focus = function() {
	if (this.size() && this.get(0).focus) try { this.get(0).focus() } catch(e) {};
	return this;
}

$.fn.blur = function() {
	if (this.size() && this.get(0).blur) this.get(0).blur();
	return this;
}

$.fn.enable = function() {
	return this.each(function(){
		this.disabled = false;
	});
}

$.fn.disable = function() {
	return this.each(function(){
		this.disabled = true;
	});
}


// timed events

$.fn.time = function (t, f, id) {
	id = id || 1;
	return this.each(function(){
		this['timer'+id] = setTimeout(f,t*1000);
	});
}

$.fn.untime = function (id) {
	id = id || 1;
	return this.each(function(){
		clearTimeout(this['timer'+id]);
	});
}


// visual DOM manipulation


$.pos = function (n) {
	var t = 0, l = 0;

	var rev = false;
	if (n.style && (n.style.position == 'static')) {
		n.style.position = 'absolute';
		rev = true;
	}

	do {
		t += n.offsetTop || 0;
		l += n.offsetLeft || 0;
		// n = n.offsetParent;
		try { n = n.offsetParent; } catch(e){ return { x: 0, y: 0}; }
	} while (n);

	if (rev) n.style.position = 'static';

	return { x: l, y: t };
}

$.place = function (n, p) {
	var s = n.style;
	s.position = 'absolute';
	s.left = p.x + 'px';
	s.top  = p.y + 'px';
}

$.scrollOffset = function(pos) {
	if (pos) {
		if (window.pageXOffset) {
			window.pageXOffset = pos.x;
			window.pageYOffset = pos.y;
		}
		else if (document.documentElement.scrollLeft) {
			document.documentElement.scrollLeft = pos.x;
			document.documentElement.scrollTop = pos.y;
		}
		else if (document.body.scrollTop) {
			document.body.scrollLeft = pos.x;
			document.body.scrollTop = pos.y;
		}
	}
	else return {
		x: window.pageXOffset
           || document.documentElement.scrollLeft
           || document.body.scrollLeft
           || 0,
		y: window.pageYOffset
		   || document.documentElement.scrollTop
		   || document.body.scrollTop
		   || 0
	}
}

$.fn.pos = function(p) {
	if (p)
		return this.each(function(){
			$.place(this, p);
		});
	else
		return $.pos(this.get(0));
}

$.fn.center = function() {
	var w = $.windowSize();
	var so = $.scrollOffset();

	return this.each(function(){
		var s = $.size(this);
		$.place(this, {
			x: so.x + Math.round((w.w - s.w)/2),
			y: so.y + Math.round((w.h - s.h)/2) - 10  // -10 compensates for optical illusion
		});
	});
}

$.fn.centerOver = function(rel) {
	var s = $.size(rel);
	var p = $.pos(rel);
	var so = $.scrollOffset();
	var x = so.x + Math.round((p.x + s.w)/2);
	var y = so.y + Math.round((p.y + s.h)/2);

	return this.each(function(){
		var s = $.size(this);
		$.place(this, {
			x: x - Math.round(s.w/2),
			y: y - Math.round(s.h/2) - 10  // -10 compensates for optical illusion
		});
	});
}

$.fn.centerBelow = function(rel, dist) {
	var p = $.pos(rel);
	var s = $.size(rel);
	var so = $.scrollOffset();
	var x = so.x + Math.round(p.x + s.w/2);
	var y = p.y + so.y + s.h + (dist || 0);

	return this.each(function(){
		var s = $.size(this);
		$.place(this, {
			x: Math.round(x - s.w/2),
			y: y
		});
	});
}

$.fn.limitToWindow = function() {
	var w = $.windowSize();
	return this.each(function(){
		var s = $.size(this);
		var p = $.pos(this);
		if (p.x + s.w > w.w) p.x = max(0, w.w - s.w - 5);
		if (p.y + s.h > w.h) p.y = max(0, w.h - s.h - 5);
		$.place(this, p);
	});
}

$.fn.resizeTo = function(size) {
	return this.each(function(){
		this.style.height = size.h + 'px';
		this.style.width  = size.w + 'px';
	});
}


// DOM measurements

$.size = function (n) {
	n = $(n).get(0);

	if (n.style.display == 'none') {
		var v = n.style.visibility;
		n.style.visibility = 'hidden';
		n.style.display = '';
		var s = { w: n.offsetWidth, h: n.offsetHeight };
		n.style.display = 'none';
		n.style.visibility = v;
	}
	else {
		var s = { w: n.offsetWidth, h: n.offsetHeight };
	}

	return s;
}

$.windowSize = function() {
	var de = document.documentElement;
	var db = document.body;
	return {
		w: window.innerWidth || (de && de.clientWidth) || (db && db.clientWidth),
		h: window.innerHeight || (de && de.clientHeight) || (db && db.clientHeight)
	}
}


// DOM properties

$.fn.prop = function(a,b) {
	if (b == null && this.size())
		return this.get(0)[a];
	else
		return this.set(a,b);
}

$.fn.hasClass = function(c) {
	if (this.size()) return $.hasWord(this.get(0),c);
	else return false;
}


// DOM builders

$.elem = function(tag) {
	var fix = { 'class':'className', 'Class':'className' };
	try {
		var e = document.createElement(tag);

		var attrs = arguments[1] || {};
		for (var attr in attrs) {
			var a = fix[attr] || attr;
			e[a] = attrs[attr];
		};
	}
	catch( ex ) {
		alert( 'Cannot create <' + tag + '> element:\n' + args.toSource() + '\n' + args );
		var e = null;
	};
	return e;
};

$.text = function(content) {
	return document.createTextNode(content);
};


// patch for jquery ajax to handle json natively
// Opera 9 doesn't like text/json header, I use text/javascript

$.httpData = function(r,type) {
	var h = r.getResponseHeader("content-type");
	return h.indexOf("xml") > 0 || type == "xml"
		? r.responseXML
		: h.indexOf("json") > 0 || h.indexOf("javascript") > 0 || type == "json"
			? eval('('+r.responseText+')')
			: r.responseText;
};


// some useful extensions to Array (from Prototype)

Array.prototype.each = function(iterator) {
	for (var i = 0; i < this.length; i++)
		iterator(this[i]);
};

Array.prototype.last = function() {
	return this[this.length - 1];
};


// minor utility functions

function min(a,b) {
	return a <= b? a: b;
}

function max(a,b) {
	return a >= b? a: b;
}