iwmlib/lib/poppable.html

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<!doctype html>
<html lang="en">
<head>
<title>Poppable Doctest</title>
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<link rel="stylesheet" href="./3rdparty/highlight/styles/default.css">
<link rel="stylesheet" href="../css/doctest.css">
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<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>