Python pygame 模块，K_RALT 实例源码

def game_loop(self):
        self.screen = pygame.display.get_surface()
        self.clock = pygame.time.Clock()
        self.load_assets()
        self.font_large = pygame.font.Font(self.font_path, 72)
        self.font = pygame.font.Font(self.font_path, 24)
        self.font_small = pygame.font.Font(self.font_path, 14)
        self.bold_font_large = pygame.font.Font(self.bold_font_path, 72)
        self.bold_font = pygame.font.Font(self.bold_font_path, 24)
        self.bold_font_small = pygame.font.Font(self.bold_font_path, 14)
        pygame.display.set_caption(self.title)
        pygame.display.set_icon(self.game_icon)
        self.difficulty = "Easy"
        self.starting_scene = scenes.TitleScene
        self.active_scene = self.starting_scene(self)

        while self.active_scene != None:
            pressed_keys = pygame.key.get_pressed()
            # Event filtering
            filtered_events = []
            for event in pygame.event.get():
                if event.type == pygame.QUIT:
                    self.quit_attempt = True
                elif event.type == pygame.KEYDOWN:
                    alt_pressed = pressed_keys[pygame.K_LALT] or \
                                  pressed_keys[pygame.K_RALT]
                    if event.key == pygame.K_ESCAPE:
                        self.quit_attempt = True
                    elif event.key == pygame.K_F4 and alt_pressed:
                        self.quit_attempt = True

                if self.quit_attempt:
                    self.active_scene.Terminate()
                else:
                    filtered_events.append(event)

            self.active_scene.ProcessInput(filtered_events, pressed_keys)
            self.active_scene.Update()
            self.active_scene.Render()

            if not self.active_scene.override_render:
                pygame.display.flip()
            self.active_scene = self.active_scene.next
            self.clock.tick(self.fps)

def process_event(self, event):
        # perf: local for faster access
        io = self.io

        if event.type == pygame.MOUSEMOTION:
            io.mouse_pos = event.pos

        if event.type == pygame.MOUSEBUTTONDOWN:
            if event.button == 1:
                io.mouse_down[0] = 1
            if event.button == 2:
                io.mouse_down[1] = 1
            if event.button == 3:
                io.mouse_down[2] = 1

        if event.type == pygame.MOUSEBUTTONUP:
            if event.button == 1:
                io.mouse_down[0] = 0
            if event.button == 2:
                io.mouse_down[1] = 0
            if event.button == 3:
                io.mouse_down[2] = 0
            if event.button == 4:
                io.mouse_wheel = .5
            if event.button == 5:
                io.mouse_wheel = -.5

        if event.type == pygame.KEYDOWN:
            for char in event.unicode:
                code = ord(char)
                if 0 < code < 0x10000:
                    io.add_input_character(code)

            io.keys_down[event.key] = True

        if event.type == pygame.KEYUP:
            io.keys_down[event.key] = False

        if event.type in (pygame.KEYDOWN, pygame.KEYUP):
            io.key_ctrl = (
                io.keys_down[pygame.K_LCTRL] or
                io.keys_down[pygame.K_RCTRL]
            )

            io.key_alt = (
                io.keys_down[pygame.K_LALT] or
                io.keys_down[pygame.K_RALT]
            )

            io.key_shift = (
                io.keys_down[pygame.K_LSHIFT] or
                io.keys_down[pygame.K_RSHIFT]
            )

            io.key_super = (
                io.keys_down[pygame.K_LSUPER] or
                io.keys_down[pygame.K_LSUPER]
            )

        if event.type == pygame.VIDEORESIZE:
            io.display_size = event.size