NSScrollView drawing errors
NSScrollView drawing errors
- Subject: NSScrollView drawing errors
- From: Michael Becker <email@hidden>
- Date: Thu, 13 Oct 2005 13:56:57 +0200
Hello all,
strange things happen with an NSScrollView of mine. Here's the setup:
I have a custom view that will programmatically add another subview
to itself. This subview contains an NSTabView. One tab of the tabview
contains an NSScrollView which again contains another custom view. I
hope so far things are clear :) ... But I am experiencing weird
things with that NSScrollView. Basically, when I scroll down, things
seem to be alright, but when I scroll up again (no matter if I use
the scroller or my mouse's scroll wheel), the drawing gets messed up.
The custom view inside of the NSScrollView doesn't do more than this
(for debugging reasons):
- (BOOL)isFlipped {
return YES;
}
- (BOOL)isOpaque {
return YES;
}
- (void) drawRect:(NSRect)rect {
[[NSColor greenColor] set];
NSRectFill( rect );
}
The views size is set bigger than the scrollview, so scrolling will
be available. What happens is, that when scrolling up, horizontal
gray lines get drawn inside the scrollview. When I draw anything else
(e.g. images) into the custom view, the drawing gets messed up. To
make up for the bad description, here are two screenshots:
Plain green: http://www.liberomusik.de/michael/scrollview1.png
With images: http://www.liberomusik.de/michael/scrollview2.png
What may have caused this?
Regards,
Michael
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