/*
* jQuery blockUI plugin
* Version 2.14 (18-JAN-2009)
* @requires jQuery v1.2.3 or later
*
* Examples at: http://malsup.com/jquery/block/
* Copyright (c) 2007-2008 M. Alsup
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
* 
* Thanks to Amir-Hossein Sobhi for some excellent contributions!
*/

; (function($)
{

	if (/1\.(0|1|2)\.(0|1|2)/.test($.fn.jquery) || /^1.1/.test($.fn.jquery)) {
		alert('blockUI requires jQuery v1.2.3 or later!  You are using v' + $.fn.jquery);
		return;
	}

	// global $ methods for blocking/unblocking the entire page
	$.blockUI = function(opts) { install(window, opts); };
	$.unblockUI = function(opts) { remove(window, opts); };

	// convenience method for quick growl-like notifications  (http://www.google.com/search?q=growl)
	$.growlUI = function(title, message, timeout)
	{
		var $m = $('<div class="growlUI"></div>');
		if (title) $m.append('<h1>' + title + '</h1>');
		if (message) $m.append('<h2>' + message + '</h2>');
		if (timeout == undefined) timeout = 3000;
		$.blockUI({
			message: $m, fadeIn: 700, fadeOut: 1000, centerY: false,
			timeout: timeout, showOverlay: false,
			css: $.blockUI.defaults.growlCSS
		});
	};

	// plugin method for blocking element content
	$.fn.block = function(opts)
	{
		return this.each(function()
		{
			if ($.css(this, 'position') == 'static')
				this.style.position = 'relative';
			if ($.browser.msie)
				this.style.zoom = 1; // force 'hasLayout'
			install(this, opts);
		});
	};

	// plugin method for unblocking element content
	$.fn.unblock = function(opts)
	{
		return this.each(function()
		{
			remove(this, opts);
		});
	};

	$.blockUI.version = 2.14; // 2nd generation blocking at no extra cost!

	// override these in your code to change the default behavior and style
	$.blockUI.defaults = {
		// message displayed when blocking (use null for no message)
		message: '<h1>Please wait...</h1>',

		// styles for the message when blocking; if you wish to disable
		// these and use an external stylesheet then do this in your code:
		// $.blockUI.defaults.css = {};
		css: {
			padding: 0,
			margin: 0,
			width: '30%',
			top: '40%',
			left: '35%',
			textAlign: 'center',
			color: '#000',
			border: '3px solid #aaa',
			backgroundColor: '#fff',
			cursor: 'wait'
		},

		// styles for the overlay
		overlayCSS: {
			backgroundColor: '#000',
			opacity: '0.6'
		},

		// styles applied when using $.growlUI
		growlCSS: {
			width: '350px',
			top: '10px',
			left: '',
			right: '10px',
			border: 'none',
			padding: '5px',
			opacity: '0.6',
			cursor: null,
			color: '#fff',
			backgroundColor: '#000',
			'-webkit-border-radius': '10px',
			'-moz-border-radius': '10px'
		},

		// z-index for the blocking overlay
		baseZ: 1000,

		// set these to true to have the message automatically centered
		centerX: true, // <-- only effects element blocking (page block controlled via css above)
		centerY: true,

		// allow body element to be stetched in ie6; this makes blocking look better
		// on "short" pages.  disable if you wish to prevent changes to the body height
		allowBodyStretch: true,

		// be default blockUI will supress tab navigation from leaving blocking content;
		constrainTabKey: true,

		// fadeIn time in millis; set to 0 to disable fadeIn on block
		fadeIn: 200,

		// fadeOut time in millis; set to 0 to disable fadeOut on unblock
		fadeOut: 400,

		// time in millis to wait before auto-unblocking; set to 0 to disable auto-unblock
		timeout: 0,

		// disable if you don't want to show the overlay
		showOverlay: true,

		// if true, focus will be placed in the first available input field when
		// page blocking
		focusInput: true,

		// suppresses the use of overlay styles on FF/Linux (due to performance issues with opacity)
		applyPlatformOpacityRules: true,

		// callback method invoked when unblocking has completed; the callback is
		// passed the element that has been unblocked (which is the window object for page
		// blocks) and the options that were passed to the unblock call:
		//     onUnblock(element, options)
		onUnblock: null,

		// don't ask; if you really must know: http://groups.google.com/group/jquery-en/browse_thread/thread/36640a8730503595/2f6a79a77a78e493#2f6a79a77a78e493
		quirksmodeOffsetHack: 4
	};

	// private data and functions follow...

	var ie6 = $.browser.msie && /MSIE 6.0/.test(navigator.userAgent);
	var pageBlock = null;
	var pageBlockEls = [];

	function install(el, opts)
	{
		var full = (el == window);
		var msg = opts && opts.message !== undefined ? opts.message : undefined;
		opts = $.extend({}, $.blockUI.defaults, opts || {});
		opts.overlayCSS = $.extend({}, $.blockUI.defaults.overlayCSS, opts.overlayCSS || {});
		var css = $.extend({}, $.blockUI.defaults.css, opts.css || {});
		msg = msg === undefined ? opts.message : msg;

		// remove the current block (if there is one)
		if (full && pageBlock)
			remove(window, { fadeOut: 0 });

		// if an existing element is being used as the blocking content then we capture
		// its current place in the DOM (and current display style) so we can restore
		// it when we unblock
		if (msg && typeof msg != 'string' && (msg.parentNode || msg.jquery)) {
			var node = msg.jquery ? msg[0] : msg;
			var data = {};
			$(el).data('blockUI.history', data);
			data.el = node;
			data.parent = node.parentNode;
			data.display = node.style.display;
			data.position = node.style.position;
			if (data.parent)
				data.parent.removeChild(node);
		}

		var z = opts.baseZ;

		// blockUI uses 3 layers for blocking, for simplicity they are all used on every platform;
		// layer1 is the iframe layer which is used to supress bleed through of underlying content
		// layer2 is the overlay layer which has opacity and a wait cursor
		// layer3 is the message content that is displayed while blocking

		var lyr1 = ($.browser.msie) ? $('<iframe class="blockUI" style="z-index:' + z++ + ';display:none;border:none;margin:0;padding:0;position:absolute;width:100%;height:100%;top:0;left:0" src="javascript:false;"></iframe>')
                                : $('<div class="blockUI" style="display:none"></div>');
		var lyr2 = $('<div class="blockUI blockOverlay" style="z-index:' + z++ + ';display:none;cursor:wait;border:none;margin:0;padding:0;width:100%;height:100%;top:0;left:0"></div>');
		var lyr3 = full ? $('<div class="blockUI blockMsg blockPage" style="z-index:' + z + ';display:none;position:fixed"></div>')
                    : $('<div class="blockUI blockMsg blockElement" style="z-index:' + z + ';display:none;position:absolute"></div>');

		// if we have a message, style it
		if (msg)
			lyr3.css(css);

		// style the overlay
		if (!opts.applyPlatformOpacityRules || !($.browser.mozilla && /Linux/.test(navigator.platform)))
			lyr2.css(opts.overlayCSS);
		lyr2.css('position', full ? 'fixed' : 'absolute');

		// make iframe layer transparent in IE
		if ($.browser.msie)
			lyr1.css('opacity', '0.0');

		$([lyr1[0], lyr2[0], lyr3[0]]).appendTo(full ? 'body' : el);

		// ie7 must use absolute positioning in quirks mode and to account for activex issues (when scrolling)
		var expr = $.browser.msie && (!$.boxModel || $('object,embed', full ? null : el).length > 0);
		if (ie6 || expr) {
			// give body 100% height
			if (full && opts.allowBodyStretch && $.boxModel)
				$('html,body').css('height', '100%');

			// fix ie6 issue when blocked element has a border width
			if ((ie6 || !$.boxModel) && !full) {
				var t = sz(el, 'borderTopWidth'), l = sz(el, 'borderLeftWidth');
				var fixT = t ? '(0 - ' + t + ')' : 0;
				var fixL = l ? '(0 - ' + l + ')' : 0;
			}

			// simulate fixed position
			$.each([lyr1, lyr2, lyr3], function(i, o)
			{
				var s = o[0].style;
				s.position = 'absolute';
				if (i < 2) {
					full ? s.setExpression('height', 'Math.max(document.body.scrollHeight, document.body.offsetHeight) - (jQuery.boxModel?0:' + opts.quirksmodeOffsetHack + ') + "px"')
                     : s.setExpression('height', 'this.parentNode.offsetHeight + "px"');
					full ? s.setExpression('width', 'jQuery.boxModel && document.documentElement.clientWidth || document.body.clientWidth + "px"')
                     : s.setExpression('width', 'this.parentNode.offsetWidth + "px"');
					if (fixL) s.setExpression('left', fixL);
					if (fixT) s.setExpression('top', fixT);
				}
				else if (opts.centerY) {
					if (full) s.setExpression('top', '(document.documentElement.clientHeight || document.body.clientHeight) / 2 - (this.offsetHeight / 2) + (blah = document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop) + "px"');
					s.marginTop = 0;
				}
				else if (!opts.centerY && full) {
					var top = (opts.css && opts.css.top) ? parseInt(opts.css.top) : 0;
					var expression = '((document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop) + ' + top + ') + "px"';
					s.setExpression('top', expression);
				}
			});
		}

		// show the message
		lyr3.append(msg); //.show();
		if (msg && (msg.jquery || msg.nodeType))
			$(msg).show();

		if (opts.fadeIn) {
			if ($.browser.msie && opts.showOverlay)
				lyr1.fadeIn(opts.fadeIn);
			if (opts.showOverlay)
				lyr2.fadeIn(opts.fadeIn);
			lyr3.fadeIn(opts.fadeIn);
		}
		else {
			if ($.browser.msie && opts.showOverlay)
				lyr1.show();
			if (opts.showOverlay)
				lyr2.show();
			lyr3.show();
		}

		// bind key and mouse events
		bind(1, el, opts);

		if (full) {
			pageBlock = lyr3[0];
			pageBlockEls = $(':input:enabled:visible', pageBlock);
			if (opts.focusInput)
				setTimeout(focus, 20);
		}
		else
			center(lyr3[0], opts.centerX, opts.centerY);

		if (opts.timeout) {
			// auto-unblock
			setTimeout(function()
			{
				full ? $.unblockUI(opts) : $(el).unblock(opts);
			}, opts.timeout);
		}
	};

	// remove the block
	function remove(el, opts)
	{
		var full = el == window;
		var data = $(el).data('blockUI.history');
		opts = $.extend({}, $.blockUI.defaults, opts || {});
		bind(0, el, opts); // unbind events
		var els = full ? $('body').children().filter('.blockUI') : $('.blockUI', el);

		if (full)
			pageBlock = pageBlockEls = null;

		if (opts.fadeOut) {
			els.fadeOut(opts.fadeOut);
			setTimeout(function() { reset(els, data, opts, el); }, opts.fadeOut);
		}
		else
			reset(els, data, opts, el);
	};

	// move blocking element back into the DOM where it started
	function reset(els, data, opts, el)
	{
		els.each(function(i, o)
		{
			// remove via DOM calls so we don't lose event handlers
			if (this.parentNode)
				this.parentNode.removeChild(this);
		});

		if (data && data.el) {
			data.el.style.display = data.display;
			data.el.style.position = data.position;
			if (data.parent)
				data.parent.appendChild(data.el);
			$(data.el).removeData('blockUI.history');
		}

		if (typeof opts.onUnblock == 'function')
			opts.onUnblock(el, opts);
	};

	// bind/unbind the handler
	function bind(b, el, opts)
	{
		var full = el == window, $el = $(el);

		// don't bother unbinding if there is nothing to unbind
		if (!b && (full && !pageBlock || !full && !$el.data('blockUI.isBlocked')))
			return;
		if (!full)
			$el.data('blockUI.isBlocked', b);

		if (b && !opts.showOverlay) // don't prevent events when overlay not in use
			return;

		// bind anchors and inputs for mouse and key events
		var events = 'mousedown mouseup keydown keypress';
		b ? $(document).bind(events, opts, handler) : $(document).unbind(events, handler);

		// former impl...
		//    var $e = $('a,:input');
		//    b ? $e.bind(events, opts, handler) : $e.unbind(events, handler);
	};

	// event handler to suppress keyboard/mouse events when blocking
	function handler(e)
	{
		// allow tab navigation (conditionally)
		if (e.keyCode && e.keyCode == 9) {
			if (pageBlock && e.data.constrainTabKey) {
				var els = pageBlockEls;
				var fwd = !e.shiftKey && e.target == els[els.length - 1];
				var back = e.shiftKey && e.target == els[0];
				if (fwd || back) {
					setTimeout(function() { focus(back) }, 10);
					return false;
				}
			}
		}
		// allow events within the message content
		if ($(e.target).parents('div.blockMsg').length > 0)
			return true;

		// allow events for content that is not being blocked
		return $(e.target).parents().children().filter('div.blockUI').length == 0;
	};

	function focus(back)
	{
		if (!pageBlockEls)
			return;
		var e = pageBlockEls[back === true ? pageBlockEls.length - 1 : 0];
		if (e)
			e.focus();
	};

	function center(el, x, y)
	{
		var p = el.parentNode, s = el.style;
		var l = ((p.offsetWidth - el.offsetWidth) / 2) - sz(p, 'borderLeftWidth');
		var t = ((p.offsetHeight - el.offsetHeight) / 2) - sz(p, 'borderTopWidth');
		if (x) s.left = l > 0 ? (l + 'px') : '0';
		if (y) s.top = t > 0 ? (t + 'px') : '0';
	};

	function sz(el, p)
	{
		return parseInt($.css(el, p)) || 0;
	};

})(jQuery);