Re: Drawing in a view with alpha < 1.0 shows windows behind
Re: Drawing in a view with alpha < 1.0 shows windows behind
- Subject: Re: Drawing in a view with alpha < 1.0 shows windows behind
- From: Lee Ann Rucker <email@hidden>
- Date: Tue, 31 Mar 2015 22:38:04 +0000
- Thread-topic: Drawing in a view with alpha < 1.0 shows windows behind
It also depends on your window’s transparency settings, which you don’t always control - Apple changed that on the window that holds the toolbar accessory in fullscreen, changing my patterned grab zone into a bunch of tiny ungrabbable holes :(
On Mar 31, 2015, at 2:53 PM, Eyal Redler <email@hidden> wrote:
> Thanks Uli, Using
> NSRectFillUsingOperation( box, NSCompositeSourceAtop )
> did the trick.
>
> Thanks to all who answered. I've been developing for mac for over 20 years and I find it really odd that I've never came across this behaviour.
>
> Eyal
>
>
>> On Mar 31, 2015, at 4:42 PM, Uli Kusterer <email@hidden> wrote:
>>
>>
>>> On 31 Mar 2015, at 14:39, Eyal Redler <email@hidden> wrote:
>>> I'm working on a custom view. I'm using the following code to draw the view
>>>
>>> [[NSColor colorWithDeviceRed:(float)42/255
>>> green:(float)49/255
>>> blue:(float)58/255
>>> alpha:0.5] set];
>>> NSRectFill([self bounds]);
>>>
>>> [[NSColor colorWithDeviceRed:(float)242/255
>>> green:(float)110/255
>>> blue:(float)80/255
>>> alpha:1.0] set];
>>>
>>> NSFrameRect([self bounds]);
>>
>> NSRectFill uses the context's default compositing operation, which usually is NSCompositeCopy. You probably want to use NSRectFillUsingOperation( box, NSCompositeSourceAbove ) or so. (this is from memory, it might be a different compositing mode, but it's definitely not "Copy")
>
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