CODEWITHSUNDEEP
cocoansviewappkit
James Eichele
James Eichele

Reputation: 119164

How can I darken everything displayed in a single NSView?

Background: My application has a main window which contains a few smaller NSView objects, each of which contains several different controls, labels, images, etc. One of these views (and everything it contains) is disabled in response to a given flag. When the flag is set, I automatically disable and grey-out all of the controls embedded within that NSView.

Question: I would like to know how to darken the disabled NSView. The effect I am looking for would be something like drawing a 50% transparent black box on top of the disabled NSView. The background and all of the controls would still be visible, but the colors would be a darker shade. Is there a simple way to do this?

Upvotes: 2

Views: 1685

Answers (1)

user57368
user57368

Reputation: 5765

CoreAnimation in 10.5 should provide an easy way to put a translucent layer above a view. You can create a black layer in front of the view, with the opacity at 0%. When you want to darken the view, set the opacity of the black layer to 50%, and the view will be darkened smoothly.

Upvotes: 4

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