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Editorial Team
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Asked: 2026-05-21T19:37:46+00:00

My Cocoa app displays a transparent window on the screen, but when the user

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My Cocoa app displays a transparent window on the screen, but when the user tries to take a screenshot using Mac OS X’s built-in screen capture key with the option of selecting full windows (Command-Shift-4, then Space Bar), my window gets highlighted as part of the possible windows to capture.

How can I tell my Window or App not to allow this? My Window already refuses to be the Main Window or Key Window through -canBecomeKeyWindow and -canBecomeMainWindow both returning NO, but this still happens.

The Window is also at the NSModalPanelWindowLevel and NSScreenSaverWindowLevel does the same thing.

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1 Answer

  1. Editorial Team

    Notice that every window is eligible for screenshots, even the desktop, dock and menu bar, which are special windows. You can even take a screenshot of the Exposé overlay window itself. This leads me to believe that there is no way to do this.

    I suppose you could hook the Command+Shift+4 key event and hide the window, but that key combo is user-definable, so it is subject to change.

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