<!doctype html> <html lang="en"> <head> <title>Poppable Doctest</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <link rel="stylesheet" href="./3rdparty/highlight/styles/default.css"> <link rel="stylesheet" href="../css/doctest.css"> <script src="./3rdparty/highlight/highlight.pack.js"></script> <script src="./3rdparty/all.js"></script> <script src="../dist/iwmlib.js"></script> </head> <body id="page" onload="Doctest.run()"> <h1> Poppables </h1> <p> Poppables present information on demand in a given context. This is an abstract base class for Popup menus and other contextual information like image highlights. It's main purpose is to ensure that only one poppable at a time can be shown in a given context. Note that in an application multiple poppables can be shown in different context at the same time. </p> <p>Let's look at an example of a popup class. In this class the register method is called by the constructor. The class also implements a close method which is called if the second poppable is registered. <script class="doctest"> class ConcretePoppable extends Poppable { constructor(context) { super() this.register(context) } close() { alert("closed") } } let context = window let a = new ConcretePoppable(context) let b = new ConcretePoppable(context) </script> </p> </body>