[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Linux Squeak VM X11 keyboard changes breaks 32b VM (#396)

Ben Coman notifications at github.com
Wed Jun 12 16:19:20 UTC 2019

Side comment 2 from http://forum.world.st/Windows-cog-vm-Keyboard-events-related-about-keycode-mapping-td4330359.html
> @jvuletich: There is a completely separated issue, and it happens both in Windows 
and Mac. Here, [ctrl] + [an alphabetic key] substracts 64 from the code. 
So, [ctrl]+[c] generates code 3. This is consistent with the traditional 
meaning of the ctrl key (in dumb terminals and DOS), but it makes 
impossible for the image to tell (for example) between [ctrl]+[Enter] 
and [ctrl]+[m]. The image might want to use these keystrokes for 
different things, so it would be much better not to substract 64 in the 
VM and let the image handle it. I know it could be done by handling key 
down and key up events, but this would also require code that is not 
only platform dependent but also needs to know the mapping between key 
codes and characters in each platform. 
In general, I think that [control], [command] and [alt/option] should 
not affect the character code of a keystroke, they should only set the 
appropriate flag so the image can decide what to do with them. This is 
completely different for [shift], as [shift] does indeed modify the 
character generated. 

You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.squeakfoundation.org/pipermail/vm-dev/attachments/20190612/45a36f38/attachment.html>

More information about the Vm-dev mailing list