Re: Transparant button click
Re: Transparant button click
- Subject: Re: Transparant button click
- From: Graham Cox <email@hidden>
- Date: Sat, 28 Aug 2010 10:30:22 +0200
On 27/08/2010, at 10:18 PM, Erik Colson wrote:
> Hi,
>
> What would be the best way to create a button with a partially transparent image on a nsview that would only respond to mouse clicks that are on the non-transparent part of the image ?
This NSImage method is the only one built-in that offers this kind of hit-test functionality (10.6 only). You could build your button around it. But for earlier OS versions you have to do the hit-test yourself. This involves testing the point against the alpha channel value of the image at that point.
- (BOOL)hitTestRect:(NSRect)testRectDestSpacewithImageDestinationRect:(NSRect)imageRectDestSpacecontext:(NSGraphicsContext*)referenceContexthints:(NSDictionary *)hintsflipped:(BOOL)flipped
--Graham_______________________________________________
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