Python Tkinter显示加载动画，同时执行某些任务

Question

我找到了这个有用的代码为从“vegaseat”提供https://www.daniweb.com/programming/software-development/threads/396918/how-to-use-animated-gifs-with-tkinter Tkinter动画。

我已经改编了一个类似的设计来显示一个项目的gif动画。我希望将其作为脚本的某些区域的功能实现，例如，导入模块等。我已经尝试了一些方法，但是当我将它作为函数调用时，它首先运行动画，然后导入模块（如我们所期望的那样）。

我想我正在探索如何让它同时工作......当脚本导入模块（或运行另一个我希望显示动画的过程）时，动画将被显示，然后消失，直到下一个电话。建议将不胜感激。

非常感谢。

# mimic an animated GIF displaying a series of GIFs 
# an animated GIF was used to create the series of GIFs 
# with a common GIF animator utility 

import time 
from Tkinter import * 
root = Tk() 
imagelist = ["dog001.gif","dog002.gif","dog003.gif", 
      "dog004.gif","dog005.gif","dog006.gif","dog007.gif"] 
# extract width and height info 
photo = PhotoImage(file=imagelist[0]) 
width = photo.width() 
height = photo.height() 
canvas = Canvas(width=width, height=height) 
canvas.pack() 
# create a list of image objects 
giflist = [] 
for imagefile in imagelist: 
    photo = PhotoImage(file=imagefile) 
    giflist.append(photo) 
# loop through the gif image objects for a while 
for k in range(0, 1000): 
    for gif in giflist: 
     canvas.delete(ALL) 
     canvas.create_image(width/2.0, height/2.0, image=gif) 
     canvas.update() 
     time.sleep(0.1) 
root.mainloop() 

编辑：我试图执行代码，下面，每一些有用的建议。目标是开始动画，而应用程序正在导入“IMPORTS”函数中的模块，然后在导入完成后将其销毁。

# Import modules 
from Tkinter import * 
from PIL import ImageTk 
from PIL import Image 
import os,time 
from os.path import dirname 
from os.path import join 

def IMPORTS(): 
    import tkMessageBox 
    from ttk import Combobox 
    import csv,datetime 
    import xlrd,xlwt 
    import getpass 
    import traceback 
    import arcpy 
    from arcpy import AddMessage 
    import win32com.client 


inGif = #root image (.gif) 
FramesFolder = #Folder containing frames of the root image 

W=Toplevel() 
W.wm_overrideredirect(True) # I wish to only display the widget spinning without the window frame 

imagelist = [os.path.join(FramesFolder,s) for s in os.listdir(FramesFolder) if not s.endswith('db')] 
# extract width and height info 
photo = PhotoImage(file=imagelist[0]) 
width = photo.width() 
height = photo.height() 
canvas = Canvas(W,width=width, height=height) 
canvas.pack() 
# create a list of image objects 
giflist = [] 
for imagefile in imagelist: 
    photo = PhotoImage(file=imagefile) 
    giflist.append(photo) 

timer_id = None 

def start_loading(n=0): 
    global timer_id 
    gif = giflist[n%len(giflist)] 
    canvas.create_image(gif.width()//2, gif.height()//2, image=gif) 
    timer_id = W.after(100, start_loading, n+1) # call this function every 100ms 

def stop_loading(): 
    if timer_id: 
     W.after_cancel(timer_id) 
     canvas.delete(ALL) 

start_loading() 
IMPORTS() 
stop_loading() 
# The spinning widget should be completely destroyed before moving on... 

它返回

"NameError: name 'tkMessageBox' is not defined" 

Answer 1

您可以使用Tk.after()和Tk.after_cancel()启动和停止动画：

timer_id = None 

def start_loading(n=0): 
    global timer_id 
    gif = giflist[n%len(giflist)] 
    canvas.create_image(gif.width()//2, gif.height()//2, image=gif) 
    timer_id = root.after(100, start_loading, n+1) # call this function every 100ms 

def stop_loading(): 
    if timer_id: 
     root.after_cancel(timer_id) 
     canvas.delete(ALL) 

然后，您可以在漫长的过程之前调用start_loading()和呼叫stop_loading()经过漫长的过程：

start_loading() 
long_process() # your long process 
stop_loading()