--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/presentation/js/jquery.slideshow.counter.js	Wed Jul 01 19:06:07 2015 +0900
@@ -0,0 +1,118 @@
+/***********
+ *
+ *  counter addon:
+ *
+ *   adds slide counter (e.g. 1/7)
+ *   - use key-n to toggle slide counter (in projection mode)
+ *
+ *   layout structure:
+ *
+ *  .layout
+ *    > #counter  (e.g. 1/7)
+ */
+
+
+Slideshow.counterInit = function()
+{
+  this.debug( 'calling counterInit()' );
+
+  // if no div.layout exists, create one
+  if( $( '.layout' ).length == 0 )
+    $( 'body' ).append( "<div class='layout'></div>");
+
+  $( '.layout' ).append( "<div id='counter'>" );
+ 
+  this.counterUpdate();
+}
+
+Slideshow.counterDebugOn = function()
+{
+  this.debug( 'calling counterDebugOn()' );
+  $( '#counter' ).addClass( 'debug' );
+}
+
+Slideshow.counterDebugOff = function()
+{
+  this.debug( 'calling counterDebugOff()' );
+  $( '#counter' ).removeClass( 'debug' );
+}
+
+Slideshow.counterKeys = function( event, key )
+{
+  this.debug( 'calling counterKeys()' );
+  
+  switch( key.which ) {
+      case 78: // n
+        this.counterToggle();
+        break;
+  }
+} 
+
+Slideshow.counterChange = function()
+{
+  this.debug( 'calling counterChange()' );
+  this.counterUpdate();
+}
+
+// ------------------------------------------------
+
+Slideshow.counterUpdate = function()
+{ 
+  $( '#counter' ).html( this.snum + '/' + this.smax );
+}
+
+
+Slideshow.counterToggle = function()
+{
+  // toggle slide number/counter
+  
+  // todo/fix: note jquery sets inline css (e.g. display: block)
+  //   but css won't get scoped for media (e.g. projection, screen, etc)
+  //   thus, css changes "spill over" to all media types
+  
+  $( '#counter' ).toggle();
+}
+
+// ------------------------------------------------
+
+Slideshow.counterAddEvents = function()
+{
+  $( document ).on( 'slideshow.init',      $.proxy( Slideshow.counterInit, this ));
+  $( document ).on( 'slideshow.debug.on',  $.proxy( Slideshow.counterDebugOn, this ));
+  $( document ).on( 'slideshow.debug.off', $.proxy( Slideshow.counterDebugOff, this ));
+  $( document ).on( 'slideshow.keys',      $.proxy( Slideshow.counterKeys, this ));
+  $( document ).on( 'slideshow.change',    $.proxy( Slideshow.counterChange, this ));
+}
+
+Slideshow.counterAddStyles = function() {
+  this.debug( 'add builtin counter css via inline style elements' );
+
+   var styleProjection =
+"<style media='screen,projection'>                   \n"+
+"                                                    \n"+
+" #counter.debug { background: #FFC; }               \n"+
+"                                                    \n"+
+" #counter      { position: fixed;                   \n"+
+"                 left: 45%; bottom: 1em;            \n"+
+"                width: 10%;                         \n"+
+"                z-index: 10;                        \n"+
+"                text-align: center;                 \n"+
+"                font-size: 80%;                     \n"+
+"              }                                     \n"+
+"                                                    \n"+
+" #counter :link,                                    \n"+
+" #counter :visited {  text-decoration: none; }      \n"+
+"                                                    \n"+
+"</style>";
+
+   var styleScreen =
+"<style media='screen'>                    \n"+
+" #counter { display: none !important; }   \n"+
+"</style>";
+
+  $( 'head' ).append( styleProjection );
+  $( 'head' ).append( styleScreen     );
+}
+
+Slideshow.counterAddStyles();
+Slideshow.counterAddEvents();
\ No newline at end of file