Re: Best technology to use for overlays?
Re: Best technology to use for overlays?
- Subject: Re: Best technology to use for overlays?
- From: Michael Ash <email@hidden>
- Date: Fri, 24 Apr 2009 07:07:58 -0400
On Fri, Apr 24, 2009 at 5:02 AM, Daniel Vollmer <email@hidden> wrote:
> Hi,
>
> I want to optimise my drawing code a bit. Essentially, I have a custom
> NSView embedded in an NSCollectionView embedded in an NSScrollView. In my
> custom view, I always want to display an overlay (consisting of something
> like a description string of what is being displayed). This overlay is of
> course expected to be always visible no matter where I scroll, which usually
> leads me to redrawing the whole view when scrolling.
> What's the usual approach to this? Move the "header" drawing code to a
> subclass of NSScrollView? Conceptually, I think I want something that uses
> the same back-end as the window compositing, as that that's closest to what
> I want (the heading stays where it is, drawn on top of the NSScrollView,
> while the custom view only has to draw the given subRect that's being
> scrolled into the visible portion).
If you want to use the same back-end as window compositing, why not
use actual window compositing? Create a borderless NSWindow, make it a
child window, and position it appropriately.
Mike
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