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    <p>Thought I'd dig a little on this. I have not tried any of the following suggestions, so nobody get their hopes up. I'll assume you're using the generator callback:</p> <pre><code>OSStatus (*GeneratePreviewForURL)( void *thisInterface, QLPreviewRequestRef preview, CFURLRef url, CFStringRef contentTypeUTI, CFDictionaryRef options ); </code></pre> <p>Before anything else, you might manually check the <code>options</code> dictionary argument and verify that the <code>kQLPreviewPropertyWidthKey</code> and <code>kQLPreviewPropertyHeightKey</code> keys are indeed mapped to the desired <code>CFNumber</code> values.</p> <p>Referring to each of these properties, the Apple QuickLook programming guide says:</p> <blockquote> <p>Note that this property is a hint; Quick Look might set the width automatically for some types of previews. The value must be encapsulated in a CFNumber object.</p> </blockquote> <p>(<strong>Edit:</strong> If your preview representation is flexible, you might try finding a preview type for which QuickLook honors your size hints, as per the statement above. Just a thought.)</p> <p>Running <code>nm</code> on the QuickLook framework binary revealed some undocumented <code>kQLPreviewProperty--</code> constants as well as the aforementioned width and height keys. One that caught my attention was <code>kQLPreviewPropertyAutoSizeKey</code>. Recalling Apple's statement about ignoring the hints to set the size <em>automatically</em>, this might be significant? Following the convention in <code>QuickLook.framework/Headers/QLBase.h</code>, you might try declaring</p> <pre><code>extern const CFStringRef kQLPreviewPropertyAutoSizeKey; </code></pre> <p>Then you could try associating a CFNumber 0 with that property key in the <code>options</code> dictionary. There are other undocumented keys of note, such as <code>kQLPreviewPropertyAttributesKey</code>.</p> <p>Back to the Info.plist you mentioned, Apple <a href="https://developer.apple.com/library/mac/documentation/userexperience/conceptual/quicklook_programming_guide/Articles/QLProjectConfig.html" rel="nofollow noreferrer">says</a> about those keys <code>QLPreviewWidth</code> and <code>QLPreviewHeight</code>:</p> <blockquote> <p>This number gives Quick Look a hint for the width (in points) of previews. <strong>It uses these values if the generator takes too long to produce the preview.</strong> (emphasis added)</p> </blockquote> <p>This is where someone makes the terrible suggestion of calling sleep() in your generator. But I'm perplexed as to <em>why</em> Apple would make following the size hints dependent on the generator latency. (?)</p> <p><strong>Edit:</strong> Also note the above statement says the Info.plist hints must be expressed in points (not pixels), a <a href="https://graphicdesign.stackexchange.com/questions/199/point-vs-pixel-what-is-the-difference">unit</a> dependent on the user's screen resolution.</p>
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    1. POSet windows size of QuickLook Plugin
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    1. COThe generator creates an image or HTML, so the preview would be based on the natural dimensions of those by default, wouldn't it?
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      1. USRob Keniger
    2. CO@Keniger, that's interesting. I wonder what effect the CSS min-width property would have in an HTML preview.
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    3. COThanks guys for the help. I've already tried to add the min-width. It changes the size of the "html" it self but not the size of the quicklook plugin window. The window is always from the same size...
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      1. USAndres
 

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