我想使用tkinter在python中创建一个通知应用程序。 我想检查系统时间是否与任何行的数据库时间字段中的时间相匹配，窗口显示会闪烁一些特定的次数，例如危险警告灯。闪烁完成后，窗口应显示的次数通知用户的事件/计划的。 我试图编写代码，但是它使窗口仅出现一次。
我尝试使用tkinter的root.after方法，但是不知道如何在应用程序中实现我想要的要求。
#repeatedly checking if system time matched any teachers scedule time--------------------------------
def repeatedquery():
def alertmsg():
for j in range (4):
newteacheradd.withdraw()
messagewindow = Toplevel()
#to come out press alt+escape
messagewindow.wm_attributes("-fullscreen", 1)
messagewindow.title("Notification")
msgflash = Label(messagewindow, text='Notice', bg="#1f618d", fg='white', font=("Verdana", 28, 'bold'),
height=5,width=40, relief=RAISED)
msgflash.place(x=150, y=300)
print ("hjgj")
time.sleep(10)
messagewindow.after(15000, messagewindow.withdraw)
messagewindow.mainloop()
def showMesagewin():
newteacheradd.withdraw()
global messagewindow
messagewindow = Toplevel()
# Covers whole screen to come out press Alt + Esc
messagewindow.wm_attributes("-fullscreen", 1)
messagewindow.title("Notification Screen")
tt = '{:3}'.format(str(i[0])) + ' {:15}'.format(str(i[1])) + ' {:15}'.format(
str(i[2])) + ' {:15}'.format(str(i[3])) + '\n'
msg = 'YOUR LECTURE/PRAC DETAILS \n\n'+" "+tt
# to place message at centre
msgflash = Label(messagewindow, text=msg, bg="#1f618d",fg='white', font=("Verdana", 28,'bold'),height=5,relief = RAISED)
msgflash.place(x=250, y=300)
#Bell rings ___________________________________________________________________________________________
pygame.init()
pygame.mixer.init()
sounda = pygame.mixer.Sound("bell.wav")
sounda.play()
time.sleep(5)
#Belll rings____________________________________________________________________________________________
messagewindow.after(5000, messagewindow.withdraw)
# schedule closing of showMesagewin event in 5 seconds
messagewindow.mainloop()
currentDT = datetime.datetime.now()
t=currentDT.strftime("%H")
conn = sq.connect("Teacher.db")
curr = conn.cursor()
tid = __userip.get()
day2 = datetime.datetime.now()
day3 = day2.strftime("%A")
curr.execute("select Time,Subject,Lecture_prac,Venue from "+day3+" where Teacher_ID=?", (tid,))
sc = curr.fetchall()
t1=0
for i in sc:
if (t == i[0]):
alertmsg()
print ('gbhj')
showMesagewin()
newteacheradd.after(1000,repeatedquery)
#-------------------------------------------------------------------------------------------------
repeatedquery()
修改后的代码
#repeatedly checking if system time matched any teachers scedule time--------------------------------
from tkinter import *
import datetime
import time
def mainwin():
newteacherappend=Tk()
i=[]
i.append(2)
i.append('Phy')
i.append('L')
i.append('301')
def repeatedquery():
def alertmsg():
for j in range (4):
newteacherappend.withdraw()
messagewindow = Toplevel()
# Covers whole screen to come out press Alt + Esc
messagewindow.wm_attributes("-fullscreen", 1)
messagewindow.title("Notification")
msgflash = Label(messagewindow, text='Notice', bg="#1f618d", fg='white', font=("Verdana", 28, 'bold'),
height=5,width=40, relief=RAISED)
msgflash.place(x=150, y=300)
print ("hjgj")
time.sleep(5)
messagewindow.after(5000, messagewindow.withdraw)
messagewindow.mainloop()
def showMesagewin():
newteacherappend.withdraw()
global messagewindow
messagewindow = Toplevel()
# Covers whole screen to come out press Alt + Esc
messagewindow.wm_attributes("-fullscreen", 1)
messagewindow.title("Notification Screen")
tt = '{:3}'.format(str(i[0])) + ' {:15}'.format(str(i[1])) + ' {:15}'.format(
str(i[2])) + ' {:15}'.format(str(i[3])) + '\n'
msg = 'YOUR LECTURE/PRAC DETAILS \n\n'+" "+tt
# to place message at centre
msgflash = Label(messagewindow, text=msg, bg="#1f618d",fg='white', font=("Verdana", 28,'bold'),height=5,relief = RAISED)
msgflash.place(x=250, y=300)
messagewindow.after(5000, messagewindow.withdraw)
# schedule closing of showMesagewin event in 5 seconds
messagewindow.mainloop()
currentDT = datetime.datetime.now()
t=currentDT.strftime("%H")
t=2
if (t == i[0]):
alertmsg()
print ('gbhj')
showMesagewin()
newteacherappend.after(1000,repeatedquery)
repeatedquery()
newteacherappend.mainloop()
mainwin()
答案 0 :(得分：0)
我编写了使用after而不使用sleep来显示闪烁消息的代码-5秒后首先显示，15秒后显示第二个。而且它只有一个mainloop()。
更多代码信息
import tkinter as tk
import datetime
# --- functions ----
# function which creates window with message
def message_start(text):
global repeates
global message_window
global message_label
repeates = 3 # how many times change background color
# create window with messages
message_window = tk.Toplevel()
message_label = tk.Label(message_window, text=text, bg='red')
message_label.pack()
# update window after 500ms
root.after(500, message_update)
# function which changes background in displayed window
def message_update():
global message_window
global repeates
if repeates > 0:
repeates -= 1
if message_label['bg'] == 'red':
message_label['bg'] = 'green'
else:
message_label['bg'] = 'red'
# update window after 500ms
root.after(500, message_update)
else:
# close window
message_window.destroy()
# inform `check_time` that window is not busy
message_window = None
# loop which updates current time and checks which message it has to display
def check_time():
# display current time
current_time = datetime.datetime.now()
root_label_time['text'] = current_time.strftime('%Y.%m.%d %H:%M:%S')
# check if there is message to display
for message in messages:
if current_time >= message['start']: # it is time to display message
if message['state'] == 'waiting': # message is not displayed at this moment
if message_window is None: # window is not busy
message['state'] = 'displayed' # don't display it again
message_start(message['text']) # display message
# update time after 1000ms (1s)
root.after(1000, check_time)
# --- main ---
messages = [
{
'text': 'Time for coffee',
'start': datetime.datetime.now() + datetime.timedelta(seconds=5),
'state': 'waiting',
},
{
'text': 'Back to work',
'start': datetime.datetime.now() + datetime.timedelta(seconds=15),
'state': 'waiting',
},
]
message_window = None
repeates = 3
# ---
root = tk.Tk()
# label with current time
root_label_time = tk.Label(root, text='- wait -')
root_label_time.pack()
# label with sheduler
root_label_sheduler = tk.Label(root)
root_label_sheduler.pack()
# displa messages in sheduler
for message in messages:
root_label_sheduler['text'] += "\n" + message['start'].strftime('%Y.%m.%d %H:%M:%S ') + message['text']
# start displaying time
check_time()
root.mainloop()