[Iup-users] Sluggish button feedback possibly resolved

[Robert P. <r.k...@gm...>]

Hi Scuri and all other happy IUP users.

A while ago there was a discussion about visual feedback on buttons in the
windows driver beeing slow. (Most notably when running without visual
styles). This 'bug' was never resolved, but I have done some investigation
on my own and I am 90% sure about the reason.

When a control i win32 api is double clicked, the message sequence is as
follows:
WM_LBUTTONDOWN
WM_LBUTTONUP,
WM_LBUTTONDBLCLICK,
WM_LBUTTONUP

See (http://msdn.microsoft.com/en-us/library/ms645606%28v=vs.85%29.aspx)

Current iupwin_button.c, line 549 (in IUP3.3):
if (msg==WM_LBUTTONDOWN && !iupAttribGetBoolean(ih, "CANFOCUS"))

Should better be:
if ( (msg==WM_LBUTTONDOWN || msg==WM_LBUTTONDBLCLICK) &&
!iupAttribGetBoolean(ih, "CANFOCUS"))

To give a more distinct visual feedback on buttons. I have not been able to
compile IUP on windows myself (troubles with mingw but this is another
story), so dont take my word on this beeing the correct solution.


Regards
Robert.P.