--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/presen/s6/js/jquery.slideshow.autoplay.js	Mon Feb 18 19:46:14 2019 +0900
@@ -0,0 +1,91 @@
+/***********
+ *
+ *  autoplay addon:
+ *
+ *   - use key-a/p/s to toggle autoplay (in projection mode)
+ */
+
+
+Slideshow.playInit = function()
+{
+  this.debug( 'calling playInit()' );
+
+  this.playInterval = null;
+}
+
+Slideshow.playStart = function()
+{
+  this.debug( 'calling playStart()' );
+
+  if( this.settings.mode == 'autoplay' )
+    this.playToggle();
+}
+
+
+Slideshow.playKeys = function( event, key )
+{
+  this.debug( 'calling playKeys()' );
+  
+  switch( key.which ) {
+    case 65: //a
+    case 80: //p
+    case 83: //s
+      this.playToggle();
+      break;
+  }
+}
+
+
+// ------------------------------------------------
+
+
+Slideshow.playWorker = function()
+{
+  this.debug( 'calling playWorker()' );
+
+  // suspend autoplay in outline view (just slideshow view)
+  if( !this.isProjection )
+    return;
+
+  // next slide/step, please
+  var csteps = this.steps[this.snum-1]; // current slide steps array 
+  
+  if( !csteps || this.incpos >= csteps.length ) {
+    if( this.snum >= this.smax )
+      this.goTo( 1 );   // reached end of show? start with 1st slide again (for endless cycle)
+    else
+      this.go(1);
+  }
+  else {
+    this.subgo(1);
+  }
+}
+
+
+Slideshow.playToggle = function()
+{
+  this.debug( 'calling playToggle()' );
+
+  if( this.playInterval )
+  {
+    this.debug( 'stopping autoplay' );
+    clearInterval( this.playInterval );
+    this.playInterval = null;
+  }
+  else
+  {
+    this.debug( 'starting autoplay' );
+    this.playInterval = setInterval( $.proxy( Slideshow.playWorker, this), 2000 );
+  }
+}
+
+// ------------------------------------------------
+
+Slideshow.playAddEvents = function()
+{
+  $( document ).on( 'slideshow.init',      $.proxy( Slideshow.playInit, this ));
+  $( document ).on( 'slideshow.start',     $.proxy( Slideshow.playStart, this ));
+  $( document ).on( 'slideshow.keys',      $.proxy( Slideshow.playKeys, this ));
+}
+
+Slideshow.playAddEvents();
\ No newline at end of file