Re: How Do I Flip An NSScrollView?
Re: How Do I Flip An NSScrollView?
- Subject: Re: How Do I Flip An NSScrollView?
- From: David Jeffery <email@hidden>
- Date: Wed, 5 Jan 2005 22:06:49 -0800
On Jan 5, 2005, at 14:27, Dan Saul wrote:
I'm having some difficulties with an NSScrollView (such as the ruler
starts at the bottom of the view) not to mention that I have to
convert all my coordinates.
I can't find anything in the documentation other then an anccessor
that you are supposed to overwrite.
Is there a relatively simple way to do this as it would save me from
lots of code and save me some hairs :-).
Thanks alot,
Dan
Hi, Dan.
First, I should state that I'm not an expert in this stuff. Second, I
should state that I *think* I know what you're asking, but I'm not
entirely sure I do. What I think you're asking is, "how do I make my
scroll view place (0.0, 0,0) at the top-left corner instead of at the
bottom-left corner?" If this is correct, then I believe that all you
have to do is handle -isFlipped in your NSScrollView subclass, as
follows:
- (BOOL)isFlipped
{
return YES;
}
I think you also need to make sure you translate points and rects
correctly, such as something like this:
- (void)mouseDragged: (NSEvent *)theEvent
{
NSPoint pt = [self convertPoint: [theEvent locationInWindow] fromView:
nil];
NSLog(@"mouseDragged: (%f, %f)", pt.x, pt.y];
}
I tested this approach out, although with a simple NSView subclass
rather than an NSScrollView. If anyone on the list would care to
confirm or criticize the correctness/appropriateness of any of this,
please do so!
David
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