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    <p>Google seems to know from a pdf where the various <code>x,y</code> text offsets are in the file. When you select a bunch of lines, it places a set of absolutely positioned "selection" divs over the image where the "text" is (they have class <code>highlight-pane</code>). When you select text, it fills in a <code>#selection-content</code> textarea with the contents of what you have selected, and selects the text in it (try using <code>window.getSelection().anchorNode</code> in Chrome, e.g.). Besides those selection overlays, there is just an image <code>.page-image</code>. I bet they actually use window to capture all the mouse gestures they care about (I assume <code>mousedown</code> and <code>mouseup</code>). (<a href="http://docs.google.com/viewer?url=http://labs.google.com/papers/bigtable-osdi06.pdf" rel="nofollow">Here's an example pdf document</a>)</p> <p>If you're absolute-positioning the elements, you could detect <code>mousedown</code>, <code>mousemove</code> and <code>mouseup</code>, figure out the span elements mouse is over (or nearest to), and fill in a textarea with the contents of all content between those two elements. If you want to just use word-granularity, I doubt anyone would complain (surround each word with a span, rather than each letter).</p> <p><strong>Edit</strong>: I got kinda curious last night and coded up a <em>really</em> naive version. It only does <code>mousedown</code> and <code>mouseup</code>, and it doesn't work in IE (I don't feel like debugging it :)</p> <p><a href="http://jsfiddle.net/PmjTj/" rel="nofollow">Check it out on jsfiddle.</a></p> <p>Features you might want to add:</p> <ol> <li>Some better way of checking for position-based matches; I just do whether it's included in the box.</li> <li>Dynamic updating on <code>mousemove</code></li> <li>Line-based rather than span-based</li> <li>You could still do selecting by background color, but depending on how your elements are arranged it might not look very good. Also would need to support transparency.</li> </ol>
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    1. CO+1 for dedication & ace answer :)
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    2. CO@hookd Thanks! It kinda hooked me, at least for the quick proof-of-concept.
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