Re: Dynamic modification of text search results
Re: Dynamic modification of text search results
- Subject: Re: Dynamic modification of text search results
- From: Martin Hewitson <email@hidden>
- Date: Wed, 04 Jul 2012 19:01:24 +0200
On 4, Jul, 2012, at 03:22 PM, Marco Tabini wrote:
>> Does anyone have any good suggestions as to how to update my search results when the underlying source text changes? Do I have to listen for all changes from the underlying text objects and try to adapt, or is there a better pattern for doing this? Xcode does this nicely: no matter what changes you make in the editor, the search results seem to be updated on the fly.
>
> Couple of random suggestions:
>
> * If you're using NSAttributedString, you can mark your search results by assigning custom attributes to specific ranges of text; as the text changes, those attributes will stick around and you can later find them using the attribute retrieval methods (I believe that's what Xcode does).
Just a follow up on this. I guess I would have to clear all text attachements of a particular class from all files at the start of a search, right? Otherwise the attachments will build up over time. I don't actually save attributed text to disk (these are plain text files) but even so. Does that make sense? I wondering how computationally expensive this will turn out to be.
Martin
>
> * As an alternative, a more naïve approach could be to simply repeat the search every time you detect the text changing, but depending on the size of your text files, that could eat up a lot of CPU cycles, and is just inelegant.
>
> I'm sure there are other possibilities, too, but these two are the first ones that come to mind.
>
> HTH,
>
>
> —Mt.
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