检测鼠标左键和右键

Question

我正在用 pygame 编写一个 replit 游戏，我希望 pygame 同时检测左击和右击。我看过诸如this 和this 之类的问题，但它们并没有解决我的问题。使用buttons = pygame.mouse.get_pressed()，我一次只能检测到一次点击。当我左键单击或右键单击时，它可以正常工作，但我无法同时左键和右键单击。 如果我按住左键，我必须双击右键才能检测到它。我希望它在第一时间被检测到。

最小工作示例：

import pygame, sys

screen = pygame.display.set_mode((320, 200))
left = False
right = False

while True:
  event = pygame.event.poll()
  buttons = pygame.mouse.get_pressed()
  if event.type == pygame.QUIT:
    pygame.quit()
    sys.exit()
  elif event.type == pygame.MOUSEBUTTONDOWN and buttons[0] and not left:
    print('left press')
    left = True
  elif event.type == pygame.MOUSEBUTTONUP and not buttons[0] and left:
    print('left release')
    left = False
  elif event.type == pygame.MOUSEBUTTONDOWN and buttons[2] and not right:
    print('right press')
    right = True
  elif event.type == pygame.MOUSEBUTTONUP and not buttons[2] and right:
    print('right release')
    right = False

  screen.fill((0, 0, 0))
  pygame.display.flip()

典型打印输出：

*left click and then release*
left press
left release

*right click and then release*
right press -- buttons = (True, False, False), left = False, right = False
right release -- buttons = (False, False, False), left = True, right = False

*left click, right click, release both*
left press -- buttons = (True, False, False), left = False, right = False
left release -- buttons = (False, False, False), left = True, right = False

*right click, left click, release both*
right press -- buttons = (False, False, True), left = False, right = False
right release -- buttons = (False, False, False), left = False, right = True

*left click, right double click, release right, release left*
left press -- buttons = (True, False, False), left = False, right = False
right press -- buttons = (True, False, True), left = True, right = False
right release -- buttons = (True, False, False), left = True, right = True
left release -- buttons = (False, False, False), left = True, right = False

*left click, right double click, release left, release right*
left press -- buttons = (True, False, False), left = False, right = False
right press -- buttons = (True, False, True), left = True, right = False
left release -- buttons = (False, False, True), left = True, right = True
right release -- buttons = (False, False, False), left = False, right = True

Same situation for the mirrored case of right click and left double click.

Answer 1

您必须结合pygame.mouse.get_pressed() 和MOUSEBUTTONDOWN 事件。永远不会同时单击这些按钮。事件一次发生一个，但pygame.mouse.get_pressed() 表示何时按住某个键。使用MOUSEBUTTONDOWN 检测按钮何时被点击，并使用pygame.mouse.get_pressed() 检查另一个按钮是否被按住：

run = True
while run:
      event = pygame.event.poll()
      buttons = pygame.mouse.get_pressed()
      if evet.type == pygame.QUIT:
          run = False 
      
      elif event.type == pygame.MOUSEBUTTONDOWN:
          
          # left clicked and right hold down
          if event.button == 1 and mouse_buttons[2]: 
          
              # [...]

          # right clicked and left hold down
          elif event.button == 3 and mouse_buttons[1]: 

              # [...]
      

Answer 2

我重新考虑了您的事件处理：

import pygame, sys

screen = pygame.display.set_mode((320, 200))
left = False
right = False

running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False 
        elif event.type == pygame.MOUSEBUTTONDOWN:
            if event.button == 1:  # LMB
                print('left press')
                left = True
            elif event.button == 3:  # RMB
                print('right press')
                right = True
        elif event.type == pygame.MOUSEBUTTONUP:
            if event.button == 1:
                print('left release')
                left = False
            elif event.button == 3:
                print('right release')
                right = False
                
    screen.fill((0, 0, 0))
    pygame.display.flip()
pygame.quit()
sys.exit()    

您描述的测试用例按预期工作，例如左键单击、右键单击、右键释放、左释放显示：

left press
right press
right release
left release