2023-05-09 13:25:39 +02:00
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<!DOCTYPE html>
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2019-03-21 09:57:27 +01:00
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<html lang="en">
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2023-05-09 13:25:39 +02:00
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="viewport" content="width=device-width, user-scalable=no" />
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<link rel="stylesheet" href="./3rdparty/highlight/styles/default.css" />
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<link rel="stylesheet" href="../css/doctest.css" />
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<script src="./3rdparty/highlight/highlight.pack.js"></script>
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<script src="../dist/iwmlib.3rdparty.js"></script>
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<script src="../dist/iwmlib.js"></script>
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</head>
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<body onload="Doctest.run()">
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<h1><a href="index.html">lib.</a>Frames</h1>
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<p>
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Frames are a major way to modularize the design of complex applications. Since pages presented in frames are
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independent of each other they can fail without impact on other pages. In addition preparing content in
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individual HTML files largely simplfies the workflow of content production.
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</p>
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<p>This approach, however, has limitations:</p>
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<script>
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function appleError() {
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alert(
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"Refused to display 'http://www.apple.com/de/' in a frame because it set 'X-Frame-Options' to 'SAMEORIGIN'."
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)
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}
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</script>
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<ul>
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<li>
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Some pages may prevent embedding them by 'X-Frame-Options', e.g.
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<a href="javascript:appleError()">www.apple.com</a>
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</li>
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<li>
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Sites with responsive design might not be able to detect the available space, e.g.
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<a href="https:///de.wikipedia.org">de.wikipedia.org</a>
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</li>
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<li>
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Touch events are not dispatched correctly to multiple frames on platforms with <b>TouchEvents</b>, e.g.
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if frame one receives touch1, all related touch points touch2, ... touchN, are send to frame1 although
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they might occur over frame two.
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</li>
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</ul>
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<p>To solve the last mentioned problem, we prevent frames form touch events by assigning a</p>
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<pre>pointer-events: none;</pre>
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style. A wrapping div is used to capture the events instead. Captured events are collected by an
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InteractionMapper and distributed as synthesized mouse or touch events to the wrapped iframes.
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<p>Let's look at an example of two HTML IFrames embedded in this Doctest.</p>
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<pre><code class="html">
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2019-03-21 09:57:27 +01:00
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<div id="frameWrapper1">
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<iframe style="pointer-events: none;" src="examples/multitouch.html"></iframe>
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</div>
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<div id="frameWrapper2" style="padding: 4px">
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<iframe style="pointer-events: none;" src="examples/multitouch.html"></iframe>
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</div>
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</code></pre>
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2023-05-09 13:25:39 +02:00
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<div class="grayBorder" id="container" style="display: flex; justify-content: space-around">
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<div id="frameWrapper1" style="padding: 4px">
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<iframe
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style="width: 400px; height: 360px; border: 0; pointer-events: none"
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src="examples/multitouch.html"
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allowfullscreen
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></iframe>
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</div>
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<div id="frameWrapper2" style="padding: 4px">
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<iframe
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style="width: 400px; height: 360px; border: 0; pointer-events: none"
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src="examples/multitouch.html"
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allowfullscreen
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></iframe>
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</div>
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</div>
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<p>
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The distribution of events is handled by the enclosing container. The container registers a
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InteractionMapper and provides adapter for iframes, that implement IInteractionTarget by sending
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programmatically generated events. If you test these frames on a multitouch device you will notice that the
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scatters within the frames can be manipulated independently of each other:
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</p>
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2019-03-21 09:57:27 +01:00
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2023-05-09 13:25:39 +02:00
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<p />
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<script class="doctest">
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let frameContainer = new FrameContainer(container)
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</script>
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<h2>References</h2>
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<ul>
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<li>
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<a href="http://stackoverflow.com/questions/8068578/how-do-i-use-multiple-iframes-in-my-html-page"
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>Multiple iFrames</a
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>
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</li>
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<li><a href="https://benmarshall.me/responsive-iframes/">Responsive iFrames</a></li>
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</ul>
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</body>
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</html>
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