Help/Streams-Patterns-Events/EventStream.html

   1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
   2 <html>
   3 <head>
   4 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
   5 <meta http-equiv="Content-Style-Type" content="text/css">
   6 <title></title>
   7 <meta name="Generator" content="Cocoa HTML Writer">
   8 <meta name="CocoaVersion" content="949.43">
   9 <style type="text/css">
  10 p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 18.0px Helvetica}
  11 p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; min-height: 14.0px}
  12 p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica}
  13 p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Monaco; color: #ad140d}
  14 p.p5 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Monaco}
  15 p.p6 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Monaco; min-height: 12.0px}
  16 span.s1 {color: #0033f1}
  17 span.s2 {color: #000000}
  18 span.s3 {color: #001bb9}
  19 span.s4 {color: #2c7014}
  20 </style>
  21 </head>
  22 <body>
  23 <p class="p1"><b>event stream</b></p>
  24 <p class="p2"><br></p>
  25 <p class="p3"><b>superclass: Object</b></p>
  26 <p class="p2"><br></p>
  27 <p class="p2"><br></p>
  28 <p class="p3">An event stream is a normal <a href="Stream.html"><span class="s1">Stream</span></a> that returns events when called. (see class <a href="../Collections/Event.html"><span class="s1">Event</span></a>)</p>
  29 <p class="p3">Usually, an event stream requires an event to be passed in, often the default event is used:</p>
  30 <p class="p2"><br></p>
  31 <p class="p4"><span class="s2">t = </span><span class="s3">Pbind</span><span class="s2">(</span><span class="s4">\x</span><span class="s2">, </span><span class="s3">Pseq</span><span class="s2">([1,2,3])).asStream; </span>// pbind, e.g. creates a stream</p>
  32 <p class="p5">t.next(<span class="s3">Event</span>.default);</p>
  33 <p class="p5">t.next(<span class="s3">Event</span>.default);</p>
  34 <p class="p2"><br></p>
  35 <p class="p3">An event stream cannot be played directly with a clock, as it returns events and not time values.</p>
  36 <p class="p3">Therefore, an <a href="EventStreamPlayer.html"><span class="s1">EventStreamPlayer</span></a> is used, which replaces the event by according time value.</p>
  37 <p class="p2"><br></p>
  38 <p class="p3">a <b>Pevent</b> can be used to wrap a stream in an event:</p>
  39 <p class="p2"><br></p>
  40 <p class="p5">t = <span class="s3">Pevent</span>(<span class="s3">Pbind</span>(<span class="s4">\x</span>, <span class="s3">Pseq</span>([1,2,3])), <span class="s3">Event</span>.default).asStream;</p>
  41 <p class="p5">t.next;</p>
  42 <p class="p5">t.next;</p>
  43 <p class="p6"><br></p>
  44 </body>
  45 </html>