Re: Responsive scrolling control with lots of subviews
Re: Responsive scrolling control with lots of subviews
- Subject: Re: Responsive scrolling control with lots of subviews
- From: Mike Abdullah <email@hidden>
- Date: Mon, 02 Mar 2015 15:10:05 +0100
> On 2 Mar 2015, at 11:44, Ben <email@hidden> wrote:
>
> Hi list,
>
> Since NSCell is apparently on the way out, I've been trying to build a new control I need using views. It's a cut-down spreadsheet-alike grid, similar to MBTableGrid here: https://github.com/brendand/mbtablegrid
>
> Unfortunately, I am running into the to-be-expected performance trouble with keeping a couple of hundred subviews in my control at the same time. It particularly hurts when scrolling. Stuff I've tried includes:
>
> - Removing the off-screen views when possible (still leaves about 150 on screen)
> - Keeping a queue of reusable views to avoid allocating new ones
> - Attempting to have one view per grid item type and treat it like an NSCell (i.e., lockFocus into the parent view and draw there)
>
> Clearly a smooth-scrolling view-based grid is possible - after all, NSTableView can do it. It's a shame I can't use it for this.
>
> Does anyone have any suggestions on how to achieve decent drawing/scrolling performance here?
Can you offer any more explanation as to *what* is slow in your experiments? What is about the number of views that seems to be bogging your control down?
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