如何通过在CodeSkulptor (Python)上按一个按钮来使文本连续移动？

Question

我试图通过按下一个按钮来使文本连续移动，但现在每次按下它时，它只移动一个间隔。

def move():
    global y
    global checkmove
    checkmove = True
    if y > 280:
        y = 0
    else:
        y += 2

Answer 1

没有内置的方法来判断按钮是否被按下。但是，有一个button_up处理程序和一个button_down处理程序。如果你使用计时器，你可以知道按键的时间有多长。下面是一个代码示例，可以告诉你哪些键被按下了。可以一次按住多个键。如果要更改计时，可以在代码底部更改计时器的长度。更改定时器1的值将更改在模拟按键之前按键的时间长度，更改定时器2的长度将更改按下后按键的速度。您还可以在此处查看代码：https://py3.codeskulptor.org/#user303_gtJ15kIGNV_0.py

def timer_handler():
    #start timer 2 if it is off
    if not timer_on:
        timer2.start()
    #stop timer 1
    timer.stop()

def timer2_handler():
    #simulates repeated keypresses if the key is held down
    global timer_on
    timer_on=True
    if len(held_keys)==0:
        timer2.stop()
        timer_on=False
    else:
        for item in held_keys:
            action(item)

def action(key):
    #this is where all the code to make something happen goes
    if key==upkey:
        #do something
        print('up key pressed')
    elif key==downkey:
        #do something else
        print('down key pressed')

def key_handler(key):
    #handles user keypresses
    #add key to held keys
    global held_keys
    held_keys.append(key)
    #do something with key
    action(key)
    #start timer 1 if timer 2 is off
    if not timer_on:
        timer.start()

def release_handler(key):
    #handles key releases
    #remove the key from the list
    global held_keys
    if key in held_keys:
        held_keys.remove(key)
    #if no keys are held, stop both timers
    global timer_on
    if len(held_keys)==0:
        timer.stop()
        timer2.stop()
        timer_on=False

import simplegui

timer_on=False
held_keys=[]

#starts timer 2
timer = simplegui.create_timer(300, timer_handler)
#automatic keypress
timer2 = simplegui.create_timer(100, timer2_handler)

#map whatever keys you need
spacekey=simplegui.KEY_MAP['space']
leftkey=simplegui.KEY_MAP['left']
rightkey=simplegui.KEY_MAP['right']
upkey=simplegui.KEY_MAP['up']
downkey=simplegui.KEY_MAP['down']

#create a frame and set key down/up handlers
frame=simplegui.create_frame('Click the box, then use arrow keys to move', 100, 100)
frame.set_keydown_handler(key_handler)
frame.set_keyup_handler(release_handler)
frame.start()