KeyActions that require two keys?

[carltesta]

Hi Everyone,

I was wondering if anyone might have any advice on how to create keyActions
that require multiple keys to be pressed? Or one key acting as a latch that
requires an additional key to determine intent?

For example, holding down key "F" would tell SC I want to change the
feedback level, then hitting keys 1, 2, 3, or 4 would tell SC which feedback
I want to change. Any ideas?

Thank You,
Carl





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[Daniel Mayer]

Post by carltesta
Hi Everyone,
I was wondering if anyone might have any advice on how to create keyActions
that require multiple keys to be pressed? Or one key acting as a latch that
requires an additional key to determine intent?
For example, holding down key "F" would tell SC I want to change the
feedback level, then hitting keys 1, 2, 3, or 4 would tell SC which feedback
I want to change. Any ideas?
Thank You,
Carl

Modifier keys would be a standard option.

But you could also write a data structure (could be a class)
that keeps track of pressed keys by keyDown- and -UpActions,
and that you could assign custom actions for combos.

Maybe somebody has already done that with earlier Document versions ?
Currently Document is in development in the 3.7 branch.

Greetings

Daniel

-----------------------------
www.daniel-mayer.at
-----------------------------



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[Eli Fieldsteel]

I asked a similar question back in this thread:

http://new-supercollider-mailing-lists-forums-use-these.2681727.n2.nabble.com/non-repeating-keyDownAction-when-key-is-held-td7609902.html

Though not the same issue, the solution (using a Set to keep a dynamic
collection of currently depressed keys) could easily be adapted to this
issue. Really, all you'd need to do is add conditional statements to take
your desired action(s) based on the keys in the Set, and the order in which
those keys are pressed.

Eli



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[carltesta]

Thanks Everyone,

Yes, the Set is what I needed. Here is what I came up with.

Thanks,
Carl

(
~window = Window.new.front;
~keySet = Set[];
~window.view.keyDownAction_({
arg view, char, mod, uni, key;
case
{char == $t} {~keySet.add($t)}
{char == $l} {~keySet.add($l)}
{char == $p} {~keySet.add($p)}
{char == $m} {~keySet.add($m)}

{char == $a} {
case
{~keySet.includes($t)} {"T also pressed".postln}
{~keySet.includes($l)} {"L also pressed".postln}
{~keySet.includes($p)} {"P also pressed".postln}
{~keySet.includes($m)} {"M also pressed".postln}
}
});

~window.view.keyUpAction_({
arg view, char, mod, uni, key;
case
{char == $t} {~keySet.remove($t)}
{char == $l} {~keySet.remove($l)}
{char == $p} {~keySet.remove($p)}
{char == $m} {~keySet.remove($m)}
});
)




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