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Bug 3528

Summary: SDL_WINDOWEVENT_LEAVE event is repeated continously
Product: SDL Reporter: axel mattauch <axel.mattauch>
Component: eventsAssignee: Sam Lantinga <slouken>
Status: RESOLVED INVALID QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: philipp.wiesemann
Version: 2.0.5   
Hardware: x86_64   
OS: Windows 8   
Attachments: Simple test program to understow the window events in SDL2

Description axel mattauch 2016-12-18 15:46:46 UTC 
Created attachment 2654 [details]
Simple test program to understow the window events in SDL2

See simple test program attached 
(derivated from http://wiki.libsdl.org/SDL_WindowEvent?highlight=%28%5CbCategoryStruct%5Cb%29%7C%28CategoryEvents%29 )

After moving the mouse inside the window one single  SDL_WINDOWEVENT_ENTER is issued, but moving then the mouse outside the window lead to repetitive SDL_WINDOWEVENT_LEAVE events, even if the mouse is steady.
Comment 1 Philipp Wiesemann 2016-12-21 19:41:02 UTC 
In the attached test program, the return value of SDL_PollEvent() is not checked to see if there is a new event at all. This might lead to processing the same event several times.
Comment 2 axel mattauch 2016-12-22 13:55:10 UTC 
The use of the int return value is clearly indicated in the Wiki.
I understood falsely that a NULL event is 'no more event'.
Bug is in my test program.

I apologize for the disturbance.
Comment 3 Sam Lantinga 2016-12-23 01:02:40 UTC 
No worries, I'm glad you figured it out.