On Wed, 10 Jan 2024 21:35:57 GMT, Harshitha Onkar <hon...@openjdk.org> wrote:
> A black screen is seen on newer versions of macOS (13.3 & above) when a
> window is set to full-screen using `setFullScreenWindow()`. The root cause
> was narrowed down to the shield level of the full-screen window vs the shield
> level of the captured display.
>
> Following solutions were explored -
>
> 1. Setting `kCGMaximumWindowLevelKey` as the shield level for the full screen
> window. But setting the fullscreen window to maximum available window level
> might cause z-order issues when other popup/screen savers are involved.
>
> int shieldLevel = CGWindowLevelForKey(kCGMaximumWindowLevelKey);
> window.preFullScreenLevel = [nsWindow level];
> [nsWindow setLevel: shieldLevel];
>
> 2. Raise the window's level slightly (shieldLevel + 1) above the system
> shield window.
>
> int shieldLevel = CGShieldingWindowLevel();
> window.preFullScreenLevel = [nsWindow level];
> [nsWindow setLevel: (shieldLevel + 1)];
>
> 3. Keeping the shielding level as-is and bringing the window to the
> foreground after display is captured. The 3rd approach **(also the one Apple
> recommends)** ensures that the full screen window has focus as well as being
> visible and also maintains the correct z-order. This solution works as
> expected on older (< 13.3) and newer versions (13.3 & above) of macOS.
>
> if (CGDisplayCapture(aID) == kCGErrorSuccess) {
> ...
> ...
> int shieldLevel = CGShieldingWindowLevel();
> window.preFullScreenLevel = [nsWindow level];
> [nsWindow setLevel: shieldLevel];
> [nsWindow makeKeyAndOrderFront: nil];
> }
How it will work now(and worked before) if the user will call toBack() on the
such fullscreen window?
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PR Comment: https://git.openjdk.org/jdk/pull/17358#issuecomment-1885934211
