Thanks Gideon.
Turning on the layer backing for all those levels did fix the redrawing problem.
I didn't find out how to fix the layer drawing when the bounds origin has been
moved, but I did work out a workaround.
I added an instance variable to my view (the scrollview's document view):
@property (assign) NSPoint originOffset;
I set that to the offset from the origin to where I want the bounds origin to
be, then in drawRect, I do:
CGContextRef currentContext = NSGraphicsContext.currentContext.graphicsPort;
CGContextSaveGState(currentContext);
CGContextTranslateCTM(currentContext, self.originOffset.x,
self.originOffset.y);
...do all my drawing relative to where the bounds origin should be
CGContextRestoreGState(currentContext);
That gets my view drawing properly, but I still have the problem of positioning
my subviews, so I created a view that I will never draw as follows:
@implementation OffsetView
- (id)initWithFrame:(NSRect)frame {
self = [super initWithFrame:frame];
if (self) {
// Initialization code here.
self.layerContentsRedrawPolicy = NSViewLayerContentsRedrawNever;
}
return self;
}
- (BOOL)isFlipped {
return YES;
}
@end
Then in my main view, I add the following:
OffsetView *offsetView = [[OffsetView alloc] initWithFrame:self.bounds];
[offsetView setBoundsOrigin:NSMakePoint(-self.originOffset.x,
-self.originOffset.y)];
[self addSubview:offsetView];
And now I just add my subviews to the offset view instead of the main view.
This does seem like a nasty hack to get the result I want, but it works, and
nobody else has suggested any alternative, so I'll just run with it.
Thanks again for the help.
Ken
On Oct 18, 2013, at 03:20 PM, Gideon King <gid...@novamind.com> wrote:
I knew I was going to want to do something like that myself so created a small
test project.
...
Can anyone else help with how to draw a layer backed view where the bounds
origin has been shifted?
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