Re: Drawing many different strings quickly
Re: Drawing many different strings quickly
- Subject: Re: Drawing many different strings quickly
- From: Ben <email@hidden>
- Date: Mon, 28 Sep 2015 22:11:57 +0100
> On 28 Sep 2015, at 17:08, Jens Alfke <email@hidden> wrote:
>
>
>> On Sep 28, 2015, at 1:41 AM, Ben <email@hidden <mailto:email@hidden>> wrote:
>>
>> When scrolling vertically, there could be up to 100,000 strings to be drawn, horizontally, much fewer, less than 10,000. I'm assuming a maximum grid size of 100 columns and 10k rows. This should be a worst-case assumption.
>
> As various people have said, there is no reason to draw any text that’s outside the dirtyRect passed to your -drawRect: call. So you never need to draw 100k strings at once. I’m confused by your statements in this thread — you do say that you abide by the dirtyRect, so why are you drawing so many strings?
>
>> Unfortunately NSTableView doesn't offer the type of interactions I want. I have filed a radar requesting enhancements.
>
> It’s very customizable. What’s missing for you?
I am sorry for the poor explanations. I hope this clears up my phrasing:
I am only drawing the area requested by the dirtyRect parameter.
I mention the large number of strings since when scrolling I am being asked to draw a larger number of dirtyRect blocks in quick succession. This means a correspondingly larger number of strings to be drawn.
True, they are not all in the same drawRect call, but in sufficiently close proximity that I thought speeding up the largest consumer of cpu time (ie. string drawing) would help the improve the scroll lag.
The biggest thing missing for me in NSTableView is single-cell selection and highlighting. There was also a drawing bug which I filed a radar for.
—
Thank you all for the suggestions though, I will try each of them.
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