How do I make hotkeys in pygame-CodePudding

I'm making a game with pygame and I want to add a hotkey to close the game. Right now I am using:

keys_pressed = pygame.key.get_pressed()

# Hotkey for exiting game. CTRL   SHIFT   Q
if keys_pressed[pygame.K_LCTRL] and keys_pressed[pygame.K_LSHIFT] and keys_pressed[pygame.K_q]:
    pygame.quit()
    sys.exit()

This works in closing the game but if I press other keys with it (Ex/ CTRL SHIFT L Q), it also closes the game. Is there a way I can fix this and have it only work if my desired keys are pressed and nothing else.

CodePudding user response：

If you're handling KEYDOWN or KEYUP events, the event object has a bit field attribute called mod that will tell you which other modifier keys are pressed.

Here's a minimal example:

import pygame

screen = pygame.display.set_mode((480, 320))
pygame.init()

run = True
clock = pygame.time.Clock()
while run:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False
        elif event.type == pygame.KEYDOWN:
            print(f"Key {pygame.key.name(event.key)} pressed")
            if event.key == pygame.K_q:
                if event.mod & pygame.KMOD_CTRL and event.mod & pygame.KMOD_SHIFT:      
                    print("Hotkey Exit!")
                    run = False       
        elif event.type == pygame.KEYUP:
            print(f"Key {pygame.key.name(event.key)} released")

    screen.fill(pygame.Color("grey"))
    pygame.display.update()
    clock.tick(60)  # limit to 60 FPS

pygame.quit()

When running the code and then pressing Ctrl Shift Q you'll see the following on the console:

$ python3.9 -i pyg_simple_hotkey.py
pygame 2.1.2 (SDL 2.0.18, Python 3.9.13)
Hello from the pygame community. https://www.pygame.org/contribute.html
Key left ctrl pressed
Key left shift pressed
Key q pressed
Hotkey Exit!
>>>

CodePudding user response：

Just count the total number of keys pressed and include that as a condition in your if statement:

import pygame
import sys
import time

pygame.init()

display = pygame.display.set_mode((300, 300))
clock = pygame.time.Clock()

while True:
    clock.tick(100)
    pygame.event.pump()
    keys_pressed = pygame.key.get_pressed()
    num_keys_pressed = len([x for x in keys_pressed if x])

    if (
        num_keys_pressed == 3
        and keys_pressed[pygame.K_LCTRL]
        and keys_pressed[pygame.K_LSHIFT]
        and keys_pressed[pygame.K_q]
    ):
        break

pygame.quit()