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Bug 2496

Summary: mouse left button double click event issue
Product: SDL Reporter: cplu <chenpinglu01>
Component: eventsAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: chenpinglu01
Version: 2.0.3   
Hardware: x86_64   
OS: Windows 8   

Description cplu 2014-04-14 07:30:55 UTC 
When I double click on a window, the "clicks" field (newly added since 2.0.2) in SDL_MouseButtonEvent is 1 instead of 2.
However, when I "tripple" click, "clicks" field is then 2.
I'v look into the source code in SDL_windowsevents.c and found that when a double click event comes, WIN_WindowProc will get a WM_LBUTTONDBLCLK msg. The message sequence of a double click is:WM_LBUTTONDOWN->WM_LBUTTONUP->WM_LBUTTONDBLCLK->WM_LBUTTONUP.
It seems that WIN_WindowProc has not dealt with the sequence above correctly and no "left button down" for the second click, which causes the problem I mentioned.
Comment 1 Sam Lantinga 2014-04-18 03:58:42 UTC 
According to Microsoft's documentation, WM_LBUTTONDBLCLK will only be sent to windows with the CS_DBLCLKS style. Are you setting that on the SDL window?
Comment 2 cplu 2014-04-18 04:56:13 UTC 
I'm using wxPanel and maybe it has set CS_DBCLICKS as default. I'll take a close look at its source.
Comment 3 Sam Lantinga 2014-04-18 05:50:55 UTC 
This should be fixed, thanks!
https://hg.libsdl.org/SDL/rev/e3a80970cf0b