Re: changes to NSView's frame in its window
Re: changes to NSView's frame in its window
- Subject: Re: changes to NSView's frame in its window
- From: John Joyce <email@hidden>
- Date: Wed, 23 Jun 2010 13:35:02 -0500
On Jun 23, 2010, at 1:28 PM, Kyle Sluder wrote:
> On Wed, Jun 23, 2010 at 10:33 AM, Alexander Cohen <email@hidden> wrote:
>> I have a view in an NSScrollView's document view that has a small child window attached to it, meaning the window follows that view wherever it goes. But when i scroll the scrollview, not much changes for that view. So i'm wondering if there is anyway to get changes to a views "global" frame. If i'm missing something obvious, please do tell.
>
> Scroll views (actually, clip views) work by moving their bounds
> coordinate system. When AppKit draws the view hierarchy, it applies a
> transform to the current graphics context that is based on the bounds
> coordinate system of the view being drawn; this is how you can draw at
> (0,0) in your -drawRect: and have it appear at the right point in the
> superview. Likewise, as AppKit finishes drawing a view, it pops these
> transforms off the stack.
>
> By the time your overlay window draws, it's in another window
> entirely, so it has an entirely different transform stack—notably one
> lacking the transform the clip view has applied prior to your document
> view being drawn.
>
> Your child window or the content view thereof is going to need to
> listen for bounds-change notifications from the clip view and set its
> own bounds coordinate system to match.
> _______________________________________________
Depending on your needs, you may also want to consider subclassing NSViewController or NSWindowController to handle things.
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