Best technology to use for overlays?
Best technology to use for overlays?
- Subject: Best technology to use for overlays?
- From: Daniel Vollmer <email@hidden>
- Date: Fri, 24 Apr 2009 11:02:01 +0200
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).
An example of the views is here: http://maven.de/code/wowplot/example_chains.png
. The description at the top-left of each plot always stays in the
same position even when scrolling left or right.
Thanks for any suggestions,
Daniel.
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