resources/src/jquery/jquery.footHovzer.js

   1 /**
   2  * @class jQuery.plugin.footHovzer
   3  */
   4 ( function ( $ ) {
   5         var $hovzer, footHovzer, prevHeight, newHeight;
   6
   7         function getHovzer() {
   8                 if ( $hovzer === undefined ) {
   9                         $hovzer = $( '<div id="jquery-foot-hovzer"></div>' ).appendTo( 'body' );
  10                 }
  11                 return $hovzer;
  12         }
  13
  14         /**
  15          * Utility to stack stuff in an overlay fixed on the bottom of the page.
  16          *
  17          * Usage:
  18          *
  19          *     var hovzer = $.getFootHovzer();
  20          *     hovzer.$.append( $myCollection );
  21          *     hovzer.update();
  22          *
  23          * @static
  24          * @inheritable
  25          * @return {jQuery.footHovzer}
  26          */
  27         $.getFootHovzer = function () {
  28                 footHovzer.$ = getHovzer();
  29                 return footHovzer;
  30         };
  31
  32         /**
  33          * @private
  34          * @class jQuery.footHovzer
  35          */
  36         footHovzer = {
  37
  38                 /**
  39                  * @property {jQuery} $ The stack container
  40                  */
  41
  42                 /**
  43                  * Update dimensions of stack to account for changes in the subtree.
  44                  */
  45                 update: function () {
  46                         var $body;
  47
  48                         $body = $( 'body' );
  49                         if ( prevHeight === undefined ) {
  50                                 prevHeight = getHovzer().outerHeight( /* includeMargin = */ true );
  51                                 $body.css( 'paddingBottom', '+=' + prevHeight + 'px' );
  52                         } else {
  53                                 newHeight = getHovzer().outerHeight( true );
  54                                 $body.css( 'paddingBottom', ( parseFloat( $body.css( 'paddingBottom' ) ) - prevHeight ) + newHeight );
  55
  56                                 prevHeight = newHeight;
  57                         }
  58                 }
  59         };
  60
  61         /**
  62          * @class jQuery
  63          * @mixins jQuery.plugin.footHovzer
  64          */
  65
  66 }( jQuery ) );