Re: View hierarchy, documentation, and origin location.
Re: View hierarchy, documentation, and origin location.
- Subject: Re: View hierarchy, documentation, and origin location.
- From: Kyle Sluder <email@hidden>
- Date: Mon, 23 Sep 2013 19:05:02 -0700
On Mon, Sep 23, 2013, at 06:20 PM, Peter Teeson wrote:
>
> On 2013-09-23, at 1:36 PM, Kyle Sluder wrote:
> > What’s _theMatrix’s frame?
> Here once again is the code I posted
That's not what I asked. I asked for the frame.
> It's values happen to be 40.0 40.0 500.0 500.0
Thank you for answering my question.
>
> > It could either have an origin that puts it at the top, or it could draw
> > its content in its upper-left and have a size that fills the superview, or its superview could return YES from -isFlipped.
> There is no superview of a window's content view - it is the root of the
> view hierarchy.
>
> >> The default location is stated to be lower left.
> > See -[NSView isFlipped].
> Of course I read the docn and know about this.
And I know that the default location is the lower left. But it seemed
worth mentioning what affected "the default."
>
> > Flippedness does not cascade; every NSView’s bounds coordinate system is independent.
> I know that.
> > If a view returns NO from -isFlipped, then drawing at (0,0) in that view’s bounds
> > will always draw at the lower left of that view, regardless of whether any ancestors return YES from -isFlipped.
> No it doesn't! The code I posted draws from the top left.
Did you write NSMatrix? Then how do you know it's doing its own drawing
at (0,0)?
--Kyle Sluder
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