/*
  * sidebar.js
  * ~~~~~~~~~~
  *
  * This script makes the Sphinx sidebar collapsible.
  *
  * .sphinxsidebar contains .sphinxsidebarwrapper.  This script adds
  * in .sphixsidebar, after .sphinxsidebarwrapper, the #sidebarbutton
  * used to collapse and expand the sidebar.
  *
  * When the sidebar is collapsed the .sphinxsidebarwrapper is hidden
  * and the width of the sidebar and the margin-left of the document
  * are decreased. When the sidebar is expanded the opposite happens.
  * This script saves a per-browser/per-session cookie used to
  * remember the position of the sidebar among the pages.
  * Once the browser is closed the cookie is deleted and the position
  * reset to the default (expanded).
  *
  * :copyright: Copyright 2007-2011 by the Sphinx team, see AUTHORS.
  * :license: BSD, see LICENSE for details.
  *
  */
 
 $(function() {
   // global elements used by the functions.
   // the 'sidebarbutton' element is defined as global after its
   // creation, in the add_sidebar_button function
   var bodywrapper = $('.bodywrapper');
   var sidebar = $('.sphinxsidebar');
   var sidebarwrapper = $('.sphinxsidebarwrapper');
 
   // original margin-left of the bodywrapper and width of the sidebar
   // with the sidebar expanded
   var bw_margin_expanded = bodywrapper.css('margin-left');
   var ssb_width_expanded = sidebar.width();
 
   // margin-left of the bodywrapper and width of the sidebar
   // with the sidebar collapsed
   var bw_margin_collapsed = '.8em';
   var ssb_width_collapsed = '.8em';
 
   // colors used by the current theme
   var dark_color = $('.related').css('background-color');
   var light_color = $('.document').css('background-color');
 
   function sidebar_is_collapsed() {
     return sidebarwrapper.is(':not(:visible)');
   }
 
   function toggle_sidebar() {
     if (sidebar_is_collapsed())
       expand_sidebar();
     else
       collapse_sidebar();
   }
 
   function collapse_sidebar() {
     sidebarwrapper.hide();
     sidebar.css('width', ssb_width_collapsed);
     bodywrapper.css('margin-left', bw_margin_collapsed);
     sidebarbutton.css({
         'margin-left': '0',
         'height': bodywrapper.height()
     });
     sidebarbutton.find('span').text('»');
     sidebarbutton.attr('title', _('Expand sidebar'));
     document.cookie = 'sidebar=collapsed';
   }
 
   function expand_sidebar() {
     bodywrapper.css('margin-left', bw_margin_expanded);
     sidebar.css('width', ssb_width_expanded);
     sidebarwrapper.show();
     sidebarbutton.css({
         'margin-left': ssb_width_expanded-12,
         'height': bodywrapper.height()
     });
     sidebarbutton.find('span').text('«');
     sidebarbutton.attr('title', _('Collapse sidebar'));
     document.cookie = 'sidebar=expanded';
   }
 
   function add_sidebar_button() {
     sidebarwrapper.css({
         'float': 'left',
         'margin-right': '0',
         'width': ssb_width_expanded - 28
     });
     // create the button
     sidebar.append(
         '<div id="sidebarbutton"><span>&laquo;</span></div>'
     );
     var sidebarbutton = $('#sidebarbutton');
     light_color = sidebarbutton.css('background-color');
     // find the height of the viewport to center the '<<' in the page
     var viewport_height;
     if (window.innerHeight)
  	  viewport_height = window.innerHeight;
     else
 	  viewport_height = $(window).height();
     sidebarbutton.find('span').css({
         'display': 'block',
         'margin-top': (viewport_height - sidebar.position().top - 20) / 2
     });
 
     sidebarbutton.click(toggle_sidebar);
     sidebarbutton.attr('title', _('Collapse sidebar'));
     sidebarbutton.css({
         'color': '#FFFFFF',
         'border-left': '1px solid ' + dark_color,
         'font-size': '1.2em',
         'cursor': 'pointer',
         'height': bodywrapper.height(),
         'padding-top': '1px',
         'margin-left': ssb_width_expanded - 12
     });
 
     sidebarbutton.hover(
       function () {
           $(this).css('background-color', dark_color);
       },
       function () {
           $(this).css('background-color', light_color);
       }
     );
   }
 
   function set_position_from_cookie() {
     if (!document.cookie)
       return;
     var items = document.cookie.split(';');
     for(var k=0; k<items.length; k++) {
       var key_val = items[k].split('=');
       var key = key_val[0];
       if (key == 'sidebar') {
         var value = key_val[1];
         if ((value == 'collapsed') && (!sidebar_is_collapsed()))
           collapse_sidebar();
         else if ((value == 'expanded') && (sidebar_is_collapsed()))
           expand_sidebar();
       }
     }
   }
 
   add_sidebar_button();
   var sidebarbutton = $('#sidebarbutton');
   set_position_from_cookie();
 });