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Bug 3779

Summary: Enter and leave events when window is minimized
Product: SDL Reporter: Indiana Kernick <kerndog73>
Component: eventsAssignee: Sam Lantinga <slouken>
Status: RESOLVED WORKSFORME QA Contact: Sam Lantinga <slouken>
Severity: trivial    
Priority: P2    
Version: 2.0.5   
Hardware: x86_64   
OS: macOS 10.12   

Description Indiana Kernick 2017-08-26 05:10:12 UTC 
While the window is minimized. The application still receives SDL_WINDOWEVENT_ENTER and SDL_WINDOWEVENT_LEAVE events as if the window was still visible.

Reproducing this bug is easy. Write an SDL app that opens a window and prints out enter and leave events. Run the application, minimize the window and move the mouse in and out of the area where the window was when it was visible. You should see that the application receives enter and leave events while the window is minimized.
Comment 1 Sam Lantinga 2017-08-28 01:48:03 UTC 
Are you reproducing this on Mac OS X? I'm trying here, running testsprite2 --info event, and I'm not seeing this behavior.
Comment 2 Indiana Kernick 2017-08-28 07:22:53 UTC 
Yes, this behaviour was observed on MacOS 10.12
Comment 3 Sam Lantinga 2017-08-28 16:32:20 UTC 
I'm running 10.12.6. Are you seeing the problem with the testsprite2 example?
Comment 4 Indiana Kernick 2017-08-29 03:50:11 UTC 
I modified the event loop in testsprite2 to include:

if (event.type == SDL_WINDOWEVENT) {
  if (event.window.event == SDL_WINDOWEVENT_ENTER) {
    printf("Enter\n");
  } else if (event.window.event == SDL_WINDOWEVENT_LEAVE) {
    printf("Leave\n");
  }
}

and I'm still seeing the bug. I also noticed something else. The sprites slow down while the window is being dragged. Interesting.
Comment 5 Sam Lantinga 2017-08-29 05:06:00 UTC 
That's weird, I made the same change and I'm totally not seeing this bug.

Are you using the latest SDL snapshot?
http://www.libsdl.org/tmp/SDL-2.0.zip
Comment 6 Indiana Kernick 2017-08-29 06:39:08 UTC 
I just downloaded the latest snapshot from the link you provided. SDL-2.0.6-11410 and I'm still seeing the bug. I'm running a slightly older version of MacOS than you are 10.12.1 so could this be a bug with MacOS that was fixed in later versions? This might explain why I'm seeing the bug and you're not. If that is possible then I'll mark this bug as resolved and we can move on.

PS

While I've got an SDL developer with me, I'd like to take this opportunity to ask a question.

Is there a simple way to stop the window from turning black while the window is being resized? This seems to be a common problem but I'm not seeing a solution anywhere. I'm just using the SDL rendering API not (OpenGL).
Comment 7 Sam Lantinga 2017-08-29 15:31:40 UTC 
Yeah, I think it's probably been fixed. Feel free to reopen this if you have more information or it's not fixed for you in the future.

I don't know of any way to avoid the black screen. As far as I know the SDL code isn't executing during the resize.