【发布时间】：2016-09-23 00:37:58
【问题描述】：
这是一个 tkinter 程序，带有一个开始/停止按钮，用于进入和退出一个无限循环，该循环记录到一个文本记录器小部件。我一生都无法弄清楚为什么，但只有当按下开始 按钮 时，框架才会闪烁/闪烁，但功能运行良好。当我从文件菜单中选择开始时，没有闪光......关于为什么会这样的任何想法？这是我的代码中的错误吗？
import tkinter as tk
import tkinter.scrolledtext as tkst
from tkinter import ttk
import logging
def popupmsg(msg):
popup = tk.Tk()
popup.wm_title("!")
label = ttk.Label(popup, text=msg)
label.pack(side="top", fill="x", pady=10)
b1 = ttk.Button(popup, text="Okay", command=popup.destroy)
b1.pack()
popup.mainloop()
class TextHandler(logging.Handler):
def __init__(self, text):
# run the regular Handler __init__
logging.Handler.__init__(self)
# Store a reference to the Text it will log to
self.text = text
def emit(self, record):
msg = self.format(record)
def append():
self.text.configure(state='normal')
self.text.insert(tk.END, msg + '\n')
self.text.configure(state='disabled')
# Autoscroll to the bottom
self.text.yview(tk.END)
# This is necessary because we can't modify the Text from other threads
self.text.after(0, append)
def create(self, num):
# Create textLogger
topframe = tk.Frame(root)
topframe.pack(side=tk.TOP)
if num == 0:
st = tkst.ScrolledText(topframe, state='disabled')
st.configure(font='TkFixedFont')
st.pack()
self.text_handler = TextHandler(st)
# Add the handler to logger
self.logger = logging.getLogger()
self.logger.addHandler(self.text_handler)
print(num)
else:
# Add the handler to logger
self.logger = logging.getLogger()
print(num)
def stop():
root.flag = False
def loop():
th = TextHandler("none")
th.create(1)
def start():
if root.flag:
th.logger.error("error")
root.after(1000, start)
else:
th.logger.error("Loop stopped")
root.flag = True
return
start()
class HomePage(tk.Frame):
def __init__(self, parent):
tk.Frame.__init__(self, parent)
#logger and main loop
th = TextHandler("none")
th.create(0)
root.flag = True
bottomframe = tk.Frame(root)
bottomframe.pack(side=tk.BOTTOM)
topframe = tk.Frame(root)
topframe.pack(side=tk.TOP)
topframe = tk.Frame(root)
topframe.pack(side=tk.TOP)
# Create taskbar/menu
taskbar = tk.Menu(self.master)
self.master.config(menu=taskbar)
file = tk.Menu(taskbar)
file.add_command(label="Run", command=loop)
file.add_command(label="Stop", command=stop)
file.add_separator()
file.add_command(label="Settings", command=lambda: popupmsg("Coming \"soon\"..."))
file.add_separator()
file.add_command(label="Quit", command=quit)
taskbar.add_cascade(label="File", menu=file)
startButton = tk.Button(bottomframe, text="Start", command=loop)
startButton.pack()
stopButton = tk.Button(bottomframe, text="Stop", command=stop)
stopButton.pack()
exitButton = tk.Button(bottomframe, text="Exit", command=quit)
exitButton.pack()
if __name__ == "__main__":
root = tk.Tk()
app = HomePage(root)
root.wm_title("Scraper")
root.mainloop()
【问题讨论】：
-
我没有仔细看代码中的原因和位置，但是在按下按钮时，您的窗口会稍微调整大小（垂直变大）。这很可能会导致问题。