keyPressed() and keyReleased() repeats

Programming Questions

gera

keyPressed() and keyReleased() repeats

in Programming Questions • 2 years ago

Hello!!

I read that there is a problem in linux with the key functions. When I hold a key, the keyPressed() and keyReleased() functions are triggered continuously.

I want to send a character via serial port only ONCE, when a key is pressed, and send another when the key is released. i.e. send an 'A' when the key A is pressed, and send an 'a' when its released.

How can I do this??

Thank you very much!!

Replies(4)

macko123

Re: keyPressed() and keyReleased() repeats

2 years ago

Could try this:

boolean aPressed = false;
void keyPressed() {
if (key == 'A' && aPressed == false) { println("A"); aPressed = true; }
}
void keyReleased() {
if (key == 'A' && aPressed == true) { println("a"); aPressed = false; }
}

gera

Re: keyPressed() and keyReleased() repeats

2 years ago

Thanks for the quick answer! I tried a very similar code, but the functions keyPressed() and keyReleased() are called one after the other while holding the key pressed. So I get "aAaAaAaA" :(

rbrauer

Re: keyPressed() and keyReleased() repeats

2 years ago

boolean state, pstate;

void setup() {}

void draw() {
  state = false;
  state = keyPressed;
  if(state != pstate) println(state);
  pstate = state;
}

gera

Re: keyPressed() and keyReleased() repeats

2 years ago

That last one works! =)

Thank you all for your help!!

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