python - 如何在 tkinter 中更改帧，使其保持活动状态几秒钟

Question

我正在使用树莓派进行颜色检测器项目。流程是：程序启动时会显示一个欢迎屏幕，一旦颜色传感器检测到颜色，它就会将我们带到下一个屏幕输入数字。由于使用的颜色传感器是 TCS3200，它不断地为我们提供价值，很多时候它碰巧检测到颜色，即使没有颜色并且需要进入下一个屏幕。

我想要做的是，每当检测到一种颜色并进入下一个屏幕时，该屏幕应该活动 15 秒，并且应该再次返回欢迎屏幕。

我尝试使用 time.sleep，但每当我发出它时，帧提升永远不会发生，10 秒后它会显示欢迎屏幕。

我把我的代码放在这里

import RPi.GPIO as GPIO
import time
from tkinter import *
import tkinter.font as tkFont
from PIL import Image, ImageTk

def raise_frame(frame):
    frame.tkraise()

#Declare Global Variables
root = None
dfont = None
welcome = None
msg = None
value = None
number = ""

#GPIO pins
aux_vcc = 16
s2 = 5
s3 = 6
signal = 26
NUM_CYCLES = 10

#Fulscreen or windowed
fullscreen = False

def number_e():
    global number
    num = number.get()
    number.set(num)
    print(num)
    num=""
    number.set(num)
    raise_frame(PageTwo)

def num_get(num):
    current = e.get()
    e.delete(0, END)
    e.insert(0, str(current) + str(num))

def delt():
    temp = e.get()[:-1]
    e.delete(0, END)
    e.insert(0, temp)

def clr():
    e.delete(0, END)

def cancel():
    raise_frame(welcome)

#toggle fullscreen
def toggle_fullscreen(event=None):
    global root
    global fullscreen
    fullscreen = not fullscreen
    root.attributes('-fullscreen', fullscreen)
    resize()

#go into windowed mode
def end_fullscreen(event=None):
    global root
    global fullscreen
    fullscreen = False
    root.attributes('-fullscreen', False)
    resize()

#resize font based on screen size
def resize(event=None):
    global dfont
    global welcome
    new_size = -max(12, int((welcome.winfo_height() / 10)))
    dfont.configure(size=new_size)

def setup():
    GPIO.setwarnings(False)
    GPIO.setmode(GPIO.BCM)
    GPIO.setup(signal, GPIO.IN, pull_up_down=GPIO.PUD_UP)
    GPIO.setup(aux_vcc, GPIO.OUT)
    GPIO.output(aux_vcc, GPIO.HIGH)
    GPIO.setup(s2, GPIO.OUT)
    GPIO.setup(s3, GPIO.OUT)
    print("\n")

def endprogram():
    GPIO.cleanup()

def loop():
    temp = 1
    global root
    global value
    global number
    global num
    GPIO.output(s2,GPIO.LOW)
    GPIO.output(s3,GPIO.LOW)
    time.sleep(0.3)
    start = time.time()
    for impulse_count in range(NUM_CYCLES):
        GPIO.wait_for_edge(signal, GPIO.FALLING)
    duration = time.time() - start      #seconds to run for loop
    red  = NUM_CYCLES / duration   #in Hz
    print("red value - ",red)
    GPIO.output(s2,GPIO.LOW)
    GPIO.output(s3,GPIO.HIGH)
    time.sleep(0.3)
    start = time.time()
    for impulse_count in range(NUM_CYCLES):
        GPIO.wait_for_edge(signal, GPIO.FALLING)
    duration = time.time() - start
    blue = NUM_CYCLES / duration
    print("blue value - ",blue)
    GPIO.output(s2,GPIO.HIGH)
    GPIO.output(s3,GPIO.HIGH)
    time.sleep(0.3)
    start = time.time()
    for impulse_count in range(NUM_CYCLES):
        GPIO.wait_for_edge(signal, GPIO.FALLING)
    duration = time.time() - start
    green = NUM_CYCLES / duration
    print("green value - ",green)
    time.sleep(0.5)
    if ((red >= 3600 and red <= 4299) and (blue >= 3900 and blue <= 5850) and (green >= 5150 and green <= 6300)):
        raise_frame(PageOne)
    elif ((red >= 3600 and red <= 4999) and (blue >= 4199 and blue <= 4800) and (green >= 4500 and green <= 5950)):
        raise_frame(PageOne)
    elif ((red >= 4400 and red <= 4699) and (blue >= 4150 and blue <= 5000) and (green >= 4100 and green <= 4950)):
        raise_frame(PageOne)
    elif ((red >= 3600 and red <= 4399) and (blue >= 5000 and blue <= 5600) and (green >= 3900 and green <= 4499)):
        raise_frame(PageOne)
    else:
        pass
    root.after(500, loop)

#create the window
root = Tk()
root.title("Screen")
root.geometry('800x480')

welcome = Frame(root)
PageOne = Frame(root)
PageTwo = Frame(root)

for frame in (welcome, PageOne, PageTwo):
    frame.grid(row=6, column=3, sticky='news')

value = DoubleVar()
msg = StringVar()
number = StringVar()

dfont = tkFont.Font(size=-6)
myfont = tkFont.Font(size=20)
mfont = tkFont.Font(size=12)
wel = Label(welcome, text="Welcome.", font=myfont)
wel.grid(row=1, column=1, padx=0, pady=0)
wel.place(x=50, y=320)
load = Image.open("banner.png")
load = load.resize((800,250), Image.BICUBIC)
render = ImageTk.PhotoImage(load)
img = Label(welcome, image=render)
img.image = render
img.place(x=0, y=0)
img.grid(row=0, column=0)

Label(PageOne, text="Enter your Mobile Number to get reward: ", font=myfont).grid(columnspan=3, row=0, column=0, padx=100, pady=50)
e = Entry(PageOne, textvariable=number, width=30, font=myfont)
e.grid(columnspan=3, row=1, column=0, padx=150, pady=15)
Button(PageOne, text='1', command=lambda:num_get(1), borderwidth=5, relief=RAISED, height=1, width=10, font=myfont).grid(row=2, column=0)
Button(PageOne, text='2', command=lambda:num_get(2), borderwidth=5, relief=RAISED, height=1, width=10, font=myfont).grid(row=2, column=1)
Button(PageOne, text='3', command=lambda:num_get(3), borderwidth=5, relief=RAISED, height=1, width=10, font=myfont).grid(row=2, column=2)
Button(PageOne, text='4', command=lambda:num_get(4), borderwidth=5, relief=RAISED, height=1, width=10, font=myfont).grid(row=3, column=0)
Button(PageOne, text='5', command=lambda:num_get(5), borderwidth=5, relief=RAISED, height=1, width=10, font=myfont).grid(row=3, column=1)
Button(PageOne, text='6', command=lambda:num_get(6), borderwidth=5, relief=RAISED, height=1, width=10, font=myfont).grid(row=3, column=2)
Button(PageOne, text='7', command=lambda:num_get(7), borderwidth=5, relief=RAISED, height=1, width=10, font=myfont).grid(row=4, column=0)
Button(PageOne, text='8', command=lambda:num_get(8), borderwidth=5, relief=RAISED, height=1, width=10, font=myfont).grid(row=4, column=1)
Button(PageOne, text='9', command=lambda:num_get(9), borderwidth=5, relief=RAISED, height=1, width=10, font=myfont).grid(row=4, column=2)
Button(PageOne, text='0', command=lambda:num_get(0), borderwidth=5, relief=RAISED, height=1, width=10, font=myfont).grid(row=5, column=1)
Button(PageOne, text='Delete', command=delt, borderwidth=5, relief=RAISED, height=1, width=10, font=myfont).grid(row=5, column=2)
Button(PageOne, text='Clear', command=clr, borderwidth=5, relief=RAISED, height=1, width=10, font=myfont).grid(row=5, column=0)
Button(PageOne, text='Enter', bg='#0052cc', fg='#ffffff', command=number_e, borderwidth=5, relief=RAISED, height=1, width=20, font=myfont).grid(row=6, column=0, columnspan=2)
Button(PageOne, text='Cancel', command=cancel, borderwidth=5, relief=RAISED, height=1, width=10, font=myfont).grid(row=6, column=2)

Label(PageTwo, text=" ", font=myfont).grid(row=0, column=1, padx=5, pady=5)
Label(PageTwo, text="Thank You", font=myfont).grid(row=1, column=1, padx=150, pady=200)

root.bind('<F11>', toggle_fullscreen)
root.bind('<Escape>', end_fullscreen)

root.bind('<Configure>', resize)

setup()

root.after(1000, loop)
raise_frame(welcome)
toggle_fullscreen()
root.mainloop()

标签： pythontkinter