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   1  /* global _wpCustomizeLoaderSettings */
   2  window.wp = window.wp || {};
   3  
   4  (function( exports, $ ){
   5      var api = wp.customize,
   6          Loader;
   7  
   8      $.extend( $.support, {
   9          history: !! ( window.history && history.pushState ),
  10          hashchange: ('onhashchange' in window) && (document.documentMode === undefined || document.documentMode > 7)
  11      });
  12  
  13      Loader = $.extend( {}, api.Events, {
  14          initialize: function() {
  15              this.body = $( document.body );
  16  
  17              // Ensure the loader is supported.
  18              // Check for settings, postMessage support, and whether we require CORS support.
  19              if ( ! Loader.settings || ! $.support.postMessage || ( ! $.support.cors && Loader.settings.isCrossDomain ) ) {
  20                  return;
  21              }
  22  
  23              this.window  = $( window );
  24              this.element = $( '<div id="customize-container" />' ).appendTo( this.body );
  25  
  26              this.bind( 'open', this.overlay.show );
  27              this.bind( 'close', this.overlay.hide );
  28  
  29              $('#wpbody').on( 'click', '.load-customize', function( event ) {
  30                  event.preventDefault();
  31  
  32                  // Store a reference to the link that opened the customizer.
  33                  Loader.link = $(this);
  34                  // Load the theme.
  35                  Loader.open( Loader.link.attr('href') );
  36              });
  37  
  38              // Add navigation listeners.
  39              if ( $.support.history )
  40                  this.window.on( 'popstate', Loader.popstate );
  41  
  42              if ( $.support.hashchange ) {
  43                  this.window.on( 'hashchange', Loader.hashchange );
  44                  this.window.triggerHandler( 'hashchange' );
  45              }
  46          },
  47  
  48          popstate: function( e ) {
  49              var state = e.originalEvent.state;
  50              if ( state && state.customize )
  51                  Loader.open( state.customize );
  52              else if ( Loader.active )
  53                  Loader.close();
  54          },
  55  
  56          hashchange: function() {
  57              var hash = window.location.toString().split('#')[1];
  58  
  59              if ( hash && 0 === hash.indexOf( 'wp_customize=on' ) )
  60                  Loader.open( Loader.settings.url + '?' + hash );
  61  
  62              if ( ! hash && ! $.support.history )
  63                  Loader.close();
  64          },
  65  
  66          open: function( src ) {
  67              var hash;
  68  
  69              if ( this.active )
  70                  return;
  71  
  72              // Load the full page on mobile devices.
  73              if ( Loader.settings.browser.mobile )
  74                  return window.location = src;
  75  
  76              this.active = true;
  77              this.body.addClass('customize-loading');
  78  
  79              this.iframe = $( '<iframe />', { src: src }).appendTo( this.element );
  80              this.iframe.one( 'load', this.loaded );
  81  
  82              // Create a postMessage connection with the iframe.
  83              this.messenger = new api.Messenger({
  84                  url: src,
  85                  channel: 'loader',
  86                  targetWindow: this.iframe[0].contentWindow
  87              });
  88  
  89              // Wait for the connection from the iframe before sending any postMessage events.
  90              this.messenger.bind( 'ready', function() {
  91                  Loader.messenger.send( 'back' );
  92              });
  93  
  94              this.messenger.bind( 'close', function() {
  95                  if ( $.support.history )
  96                      history.back();
  97                  else if ( $.support.hashchange )
  98                      window.location.hash = '';
  99                  else
 100                      Loader.close();
 101              });
 102  
 103              this.messenger.bind( 'activated', function( location ) {
 104                  if ( location )
 105                      window.location = location;
 106              });
 107  
 108              hash = src.split('?')[1];
 109  
 110              // Ensure we don't call pushState if the user hit the forward button.
 111              if ( $.support.history && window.location.href !== src )
 112                  history.pushState( { customize: src }, '', src );
 113              else if ( ! $.support.history && $.support.hashchange && hash )
 114                  window.location.hash = 'wp_customize=on&' + hash;
 115  
 116              this.trigger( 'open' );
 117          },
 118  
 119          opened: function() {
 120              Loader.body.addClass( 'customize-active full-overlay-active' );
 121          },
 122  
 123          close: function() {
 124              if ( ! this.active )
 125                  return;
 126              this.active = false;
 127  
 128              this.trigger( 'close' );
 129  
 130              // Return focus to link that was originally clicked.
 131              if ( this.link )
 132                  this.link.focus();
 133          },
 134  
 135          closed: function() {
 136              Loader.iframe.remove();
 137              Loader.messenger.destroy();
 138              Loader.iframe    = null;
 139              Loader.messenger = null;
 140              Loader.body.removeClass( 'customize-active full-overlay-active' ).removeClass( 'customize-loading' );
 141          },
 142  
 143          loaded: function() {
 144              Loader.body.removeClass('customize-loading');
 145          },
 146  
 147          overlay: {
 148              show: function() {
 149                  this.element.fadeIn( 200, Loader.opened );
 150              },
 151  
 152              hide: function() {
 153                  this.element.fadeOut( 200, Loader.closed );
 154              }
 155          }
 156      });
 157  
 158      $( function() {
 159          Loader.settings = _wpCustomizeLoaderSettings;
 160          Loader.initialize();
 161      });
 162  
 163      // Expose the API to the world.
 164      api.Loader = Loader;
 165  })( wp, jQuery );