/*
* jQuery blockUI plugin
* Version 2.23 (21-JUN-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;
   }

   $.fn._fadeIn = $.fn.fadeIn;

   // this bit is to ensure we don't call setExpression when we shouldn't (with extra muscle to handle
   // retarded userAgent strings on Vista)
   var mode = document.documentMode || 0;
   var setExpr = $.browser.msie && (($.browser.version < 8 && !mode) || mode < 8);
   var ie6 = $.browser.msie && /MSIE 6.0/.test(navigator.userAgent) && !mode;

   // 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, onClose) {
      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,
         onUnblock: onClose,
         css: $.blockUI.defaults.growlCSS
      });
   };

   // plugin method for blocking element content
   $.fn.block = function(opts) {
      return this.unblock({ fadeOut: 0 }).each(function() {
         if ($.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 = 2.23; // 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,
         cursor: 'wait'
      },

      // 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'
      },

      // IE issues: 'about:blank' fails on HTTPS and javascript:false is s-l-o-w
      // (hat tip to Jorge H. N. de Vasconcelos)
      iframeSrc: /^https/i.test(window.location.href || '') ? 'javascript:false' : 'about:blank',

      // force usage of iframe in non-IE browsers (handy for blocking applets)
      forceIframe: false,

      // 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,

      // enable if you want key and mouse events to be disabled for content that is blocked
      bindEvents: true,

      // be default blockUI will supress tab navigation from leaving blocking content
      // (if bindEvents is true)
      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 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 (by default)
      // layer3 is the message content that is displayed while blocking

      var lyr1 = ($.browser.msie || opts.forceIframe)
    	? $('<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="' + opts.iframeSrc + '"></iframe>')
        : $('<div class="blockUI" style="display:none"></div>');
      var lyr2 = $('<div class="blockUI blockOverlay" style="z-index:' + (z++) + ';display:none;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 || opts.forceIframe)
         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 = setExpr && (!$.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
      if (msg) {
         lyr3.append(msg);
         if (msg.jquery || msg.nodeType)
            $(msg).show();
      }

      if (($.browser.msie || opts.forceIframe) && opts.showOverlay)
         lyr1.show(); // opacity is zero
      if (opts.fadeIn) {
         if (opts.showOverlay)
            lyr2._fadeIn(opts.fadeIn);
         if (msg)
            lyr3.fadeIn(opts.fadeIn);
      }
      else {
         if (opts.showOverlay)
            lyr2.show();
         if (msg)
            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
         var to = setTimeout(function() {
            full ? $.unblockUI(opts) : $(el).unblock(opts);
         }, opts.timeout);
         $(el).data('blockUI.timeout', to);
      }
   };

   // remove the block
   function remove(el, opts) {
      var full = el == window;
      var $el = $(el);
      var data = $el.data('blockUI.history');
      var to = $el.data('blockUI.timeout');
      if (to) {
         clearTimeout(to);
         $el.removeData('blockUI.timeout');
      }
      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);

      // don't bind events when overlay is not in use or if bindEvents is false
      if (!opts.bindEvents || (b && !opts.showOverlay))
         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);