如何使一个NSView中显示的所有内容变暗？ [英] How can I darken everything displayed in a single NSView?

问题描述

背景：我的应用程序有一个主窗口，其中包含一些较小的 NSView 对象，每个对象包含几个不同的控件，等等。响应给定的标志，禁用这些视图之一（及其包含的一切）。当设置标志时，我会自动禁用并隐藏 NSView 中嵌入的所有控件。

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.

问题：我想知道如何变暗已禁用的 NSView 。我正在寻找的效果就像在禁用 NSView 上绘制一个50％透明的黑盒子。背景和所有的控件仍然可见，但颜色将是一个更暗的阴影。有没有一个简单的方法来做这个？

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?

推荐答案

10.5中的CoreAnimation应该提供一个简单的方法， 。您可以在视图前创建一个黑色层，不透明度为0％。当您想使视图变暗时，将黑色层的不透明度设置为50％，视图将平滑变暗。

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.

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