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Cursor and OSX desktop in standalone fullscreen

When playing a level in standalone mode, fullscreen, the mouse keeps annoyingly interacting with the OSX desktop's top bar ad dock launcher. In particular, looking up after a while leads to the top bar popping over, and looking down to the dock appearing over the game. The only way to have them disappear again is to switch to another app (e.g. cmd+tab), move the cursor to the center of the screen, and come back to the game.

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asked May 29 '14 at 10:19 AM in Bug Reports

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Thanks for your report! I've entered this bug into our database for our developers to look at.


Ben Halliday

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answered May 29 '14 at 05:11 PM

avatar image ColdSteel48 Jan 02 '17 at 06:54 AM

I confirm same happens in my Mac OS 10.12 something... The solution to this - is to make an NSWindowLevel to be the DockWindowLevel +1. I would be happy to know if I can do this without compiling the whole UE source code - is there a way to get and set the Window level from within the CPP code ?

avatar image Doug E ♦♦ STAFF Jan 12 '17 at 06:35 PM

Hey ColdSteel48-

What engine version were you working in when this occurred? Can you provide any additional information about the issue you're seeing? As for your question, it may be possible to fix this with a change to the source code, but without more information about the exact issue you're seeing I can't say exactly what would need to change.

avatar image ColdSteel48 Jan 24 '17 at 04:24 PM

Hey Doug Wilson, Sorry for a late reply, I was using UE 4.14.2. In 4.14.3 this is almost fixed - however still can be reproduced - if you are in a fullscreen mode it will work ~smooth but once you will hit cmd+tab go to desktop do some stuff and get back to the game - you will see that Dock starts to appear when your mouse cursor is low enough.

I would like to modify the Game Window - by setting it to the Higher WindowLevel as well as shifting it 1 pixel to the top (it is a known NSWindow optimisation for games on macOS)... I am not willing to recompile the whole thing - If UE can run Objective-C it could be done easily the question is: maybe I do a C++ class that will call a function in Objective-C file through lets say C interface - making this adjustment is really easy within Objective-C and AppKit API.

Setting Higher WindowLevel will ensure that Dock will be under the game window + all other apps and stuff shouldn't even be able to issue a Draw calls (Dock as well) - shifting or making the window 1 pixel bigger - bypasses fail Apple's "Fullscreen optimizations" and can gain up to 20 FPS in some cases...



avatar image Doug E ♦♦ STAFF Jan 24 '17 at 05:30 PM

I have reproduced this issue and logged a report for it here https://issues.unrealengine.com/issue/UE-41044 . You can track the report's status as the issue is reviewed by our development staff. Please be aware that this issue may not be prioritized or fixed soon.

avatar image ColdSteel48 Jan 24 '17 at 05:32 PM
  • Doug Wilson , Thank you for your effort !! :-)

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