Re: text selection for pdfview
Re: text selection for pdfview
- Subject: Re: text selection for pdfview
- From: John Calhoun <email@hidden>
- Date: Thu, 21 Dec 2006 13:14:46 -0800
On Dec 21, 2006, at 1:27 AM, David Chan wrote:
I am currently using pdfview and I am trying to emulate the function
in adobe acrobat where user can drag a rectangle over the text and
have all the text inside the rect selected. I tried to use
selectionForRect function to get the pdfselection.
However, I notice that this function will only select the part of the
words that is inside the rect. If my rect only cover the part "sam"
from the word "sample", then only "sam" will be selected. This is
different from adobe's behavior where the whole word will be selected
as long as one of its character is inside the rect.
Yeah, it would be gross....
One way to do it though would be to:
• Start with your -[selectionForRect] since that would get everything
bounded by the rect.
• But then (here's the gross part) you would want to walk the edges of
the rectangle. You need only walk the leading and trailing edges of
the rect (top and bottom are not interesting). I think a rotated
pages will give you grief though since leading and trailing edge of
the rect will get mapped around I think. In any event, start for
example at the top right of the rect. Call -[PDFPage
selectionfOrWordAtPoint:] and add that selection to your starting
selection (you can add selections).
• Now all hope is not lost. You need not go down a single pixel. You
can get the bounds of the recent [PDFPage selectionfOrWordAtPoint:]
selection and move down to the bottom of that selection. Call -
[PDFPage selectionfOrWordAtPoint:] as before and add result to initial
selection as well.
• Repeat until you have extended off the bottom of the rect.
• Then repeat for other edge of rect.
• And be prepared to get back NULL from [PDFPage
selectionfOrWordAtPoint:]. In that case, you may want to move down a
few pixels at a time and try again....
So, it isn't pretty. Perhaps a future PDFKit can give you: - [PDFPage
selectionForRect: includeWholeWords:]
john calhoun—_______________________________________________
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