2019-03-21 09:57:27 +01:00
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<!doctype html>
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<html lang="en">
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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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2019-05-22 16:03:19 +02:00
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<link rel="stylesheet" href="./3rdparty/highlight/styles/default.css">
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2019-03-21 09:57:27 +01:00
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<link rel="stylesheet" href="../css/doctest.css">
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2019-05-22 16:03:19 +02:00
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<script src="./3rdparty/highlight/highlight.pack.js"></script>
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<script src="./3rdparty/all.js"></script>
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<script src="../dist/iwmlib.js"></script>
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2019-03-21 09:57:27 +01:00
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</head>
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<body onload="Doctest.run()" >
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<h1>
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Frames
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</h1>
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<p>
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Frames are a major way to modularize the design of complex applications. Since
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pages presented in frames are independent of each other they can fail without
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impact on other pages. In addition preparing content in individual HTML files
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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("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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</script>
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<ul><li>Some pages may prevent embedding them
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by 'X-Frame-Options', e.g. <a href="javascript:appleError()">www.apple.com</a>
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</li>
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<li>Sites with responsive design might not be able to detect the available space,
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e.g. <a href="https:///de.wikipedia.org">de.wikipedia.org</a>
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</li>
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<li>Touch events are not dispatched correctly to multiple frames on platforms with
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<b>TouchEvents</b>, e.g. if frame one
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receives touch1, all related touch points touch2, ... touchN, are send to frame1
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although 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
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assigning a <pre>pointer-events: none;</pre> style. A wrapping div is used to capture
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the events instead. Captured events are collected by an InteractionMapper and
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distributed as synthesized mouse or touch events to the wrapped iframes.
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<p>
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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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<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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<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 style="width:400px; height:360px; border:0; pointer-events: none;" src="examples/multitouch.html" allowfullscreen></iframe>
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</div>
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<div id="frameWrapper2" style="padding: 4px">
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<iframe style="width:400px; height:360px; border:0; pointer-events: none;" src="examples/multitouch.html" allowfullscreen></iframe>
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</div>
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</div>
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<p>The distribution of events is handled by the enclosing container. The container
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registers a InteractionMapper and provides adapter for iframes, that implement
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IInteractionTarget by sending programmatically generated events. If you test
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these frames on a multitouch device you will notice that the scatters within
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the frames can be manipulated independently of each other:
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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>
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References
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</h2>
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<ul>
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<li><a href="http://stackoverflow.com/questions/8068578/how-do-i-use-multiple-iframes-in-my-html-page">Multiple iFrames</a></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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