Re: Best technology to use for overlays?
Re: Best technology to use for overlays?
- Subject: Re: Best technology to use for overlays?
- From: Alexander Spohr <email@hidden>
- Date: Fri, 24 Apr 2009 12:42:24 +0200
Did you try visibleRect?
Returns the portion of the receiver not clipped by its superviews.
- (NSRect)visibleRect
Make the header a subview of your datastream-view and put it into the
visibleRect.
I hope the ScrollViews clipView does the needed job of clipping :)
atze
Am 24.04.2009 um 11:02 schrieb Daniel Vollmer:
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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