Repeated key detection in PyGame Zero

Question

My pgzero key press event handler does recognize a pressed key only once (until released) but does not support repeated key press events if the key is kept pressed.

How can I achieve this?

PS: Since pgzero is implemented using pygame perhaps a pygame solution could work…

import pgzrun

counter = 1

def on_key_down(key):
    global counter
    if key == keys.SPACE:
        print("Space key pressed...")
        counter = counter + 1

def draw():
    screen.clear()
    screen.draw.text("Space key pressed counter: " + str(counter), (10, 10))

pgzrun.go()

Asked By: R Yoda

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Source

Answer 1

The event is only triggered once, when the key is pressed. You’ve to use state variable space_pressed which is stated when the key is pressed (in on_key_down()) and reset when the key is released (in on_key_up()). Increment the counter in update(), dependent on the state of the variable space_pressed:

import pgzrun

counter = 1
space_pressed = False

def on_key_down(key):
    global space_pressed
    if key == keys.SPACE:
        print("Space key pressed...")
        space_pressed = True

def on_key_up(key):
    global space_pressed
    if key == keys.SPACE:
        print("Space key released...")
        space_pressed = False

def update():
    global counter
    if space_pressed:
        counter = counter + 1

def draw():
    screen.clear()
    screen.draw.text("Space key pressed counter: " + str(counter), (10, 10))

pgzrun.go()

Answered By: Rabbid76

Answer 2

Inspired by @furas ‘s comment I have [found->] implemented a further solution that does not require to use a global variable to manage the key state:

import pgzrun

counter = 1

# game tick rate is 60 times per second
def update():
    global counter    
    if keyboard[keys.SPACE]:  # query the current "key pressed" state
        counter = counter + 1

def draw():
    screen.clear()
    screen.draw.text("Space key pressed counter: " + str(counter), (10, 10))

pgzrun.go()

Answered By: R Yoda

Answer 3

I don’t know if you need this anymore since it’s two years ago, but there is a simple solution.
so in the update function, just add this

if keyboard.a: #or whatever key you want
        do something

Answered By: Kevin

Repeated key detection in PyGame Zero

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