Responsive scrolling control with lots of subviews
Responsive scrolling control with lots of subviews
- Subject: Responsive scrolling control with lots of subviews
- From: Ben <email@hidden>
- Date: Mon, 02 Mar 2015 10:44:12 +0000
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?
- Ben
PS. I have tried using/subclassing NSTableView and have filed a bug for the functionality that I'm after (rdar://17406314 <rdar://17406314> marked as dupe of rdar://2778108 <rdar://2778108>).
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