Showing frames by holding a button

[Cidwel]

Hi all! I'm trying to code a simply frame with useful macros and I would to show it only if I hold a key, P.e, pressing alt. I cannot do it with:

if IsAltKeyDown() then
frame:Show();
else
frame:Hide();
end

should I need to use a trigger? Thanks in advance

[xConStruct]

You can define a key for your addon in the bindings.xml and set the attribute 'runOnUp="true"'. There you can get the state of the pressed key and react if it's currently pressed or not.
See the bindings.xml example on WoWWiki. The second <Binding> in the first example is most likely the one you need.

Another method would be to set a script for the handlers OnKeyDown / OnKeyUp, but you'd have to check which key is pressed, because it fires on each one.