Re: How to draw over a control in an NSView
Re: How to draw over a control in an NSView
- Subject: Re: How to draw over a control in an NSView
- From: Ken Ferry <email@hidden>
- Date: Sun, 30 Oct 2011 19:09:30 -0700
On Oct 30, 2011, at 2:06 PM, Jens Alfke <email@hidden> wrote:
>
> On Oct 30, 2011, at 12:46 PM, Alexander Reichstadt wrote:
>
>> given a custom NSView using drawRect to draw, say, a blue rectangle, controls inside that view are always in front of the blue rectangle. Is there a way to draw above controls with drawRect? Also putting a view with controls inside another view that draw in drawRect doesn't change that. Like textfields, they are always above drawn content. How does one draw above controls?
>
> Subviews are always drawn after their superview, so they are visually in front of it. You can’t change that.
> What you can try is adding a subview, positioning it over the control, and putting it in front (I think that means later in the subviews array.) Historically AppKit hasn’t handled overlapping sibling views, but I think that nowadays if you make the parent view layer-backed it will work.
That's actually slightly reversed. AppKit has supported overlapping sibling views since 10.5. Layers complicate the story a bit, because a non-layer backed view can never draw over top of a layer.
-Ken
Cocoa Frameworks
> (But layer-backing views brings its own visual issues, so this may not work out for you.)
>
> Another approach is to subclass the control (or its cell class) and customize its drawing.
>
> —Jens
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