Revision c9391aaa376223018f7c8a4d2c92b9cffdb46cfb authored by chou86_e on 13 September 2008, 23:25:27 UTC, committed by chou86_e on 13 September 2008, 23:25:27 UTC
git-svn-id: https://svn.code.sf.net/p/ucblogo/code@199 fc4ef4ee-df3e-0410-84de-fb01f5d6c4f7
1 parent 063fd0f
keyact
KEYACT (variable)
if nonempty, should be an instruction list that will be evaluated
whenever a key is pressed on the keyboard. The instruction list
can use READCHAR to find out what key was pressed. Note that only
keys that produce characters qualify; pressing SHIFT or CONTROL
alone will not cause KEYACT to be evaluated.
Note that it's possible for the user to press a key during the
evaluation of the instruction list. If this would confuse your
program, prevent it by temporarily setting KEYACT to the empty
list. One easy way to do that is the following:
make "keyact [key.action]
to key.action [:keyact []]
... ; whatever you want the key to do
end
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