tkinter：下拉菜单不可点击

我正在创建一个tkinter窗口，每秒更新一次矩阵乘法结果。我希望使用下拉菜单为用户创建选项。但是，由于矩阵更新每秒钟都会重新绘制整个窗口，因此每秒都会重新初始化下拉菜单，这使得它们几乎无用。tkinter：下拉菜单不可点击

我想知道是否有解决这个问题的方法。

在此先感谢。

from tkinter import * 
import time 
import sys 

def update(a): 

    root.title("Matrix Multiplication") 
    menu = Menu(root) 
    root.config(menu= menu) 
    subMenu = Menu(menu) 
    menu.add_cascade(label="Options", menu=subMenu) 
    subMenu.add_command(label="Opt1...",command=win2) 

    exitMenu = Menu(menu) 
    menu.add_cascade(label="Exit", menu=exitMenu) 
    exitMenu.add_command(label="Exit",command=root.destroy) 

    X0 = [[8,7,3],[4 ,5,6],[7 ,8,9]] 
    Y0 = [[5,8,1,2],[6,7,3,0],[4,5,9,1]] 
    result0 = [[0,0,0,0],[0,0,0,0],[0,0,0,0]] 

    if a == 0: 
     cpfg = ["magenta", "blue", "green", "purple"] 
     cpbg = ["white", "white", "white", "white"] 

     button1 = Button(root, text="Button-1", fg=cpfg[0], bg=cpbg[0]) 
     button2 = Button(root, text="Button-2", fg=cpfg[1], bg=cpbg[1]) 
     button3 = Button(root, text="Button-3", fg=cpfg[2], bg=cpbg[2]) 
     button4 = Button(root, text="Button-4", fg=cpfg[3], bg=cpbg[3]) 

     button1.grid(row=0, column=0) 
     button2.grid(row=0, column=1) 
     button3.grid(row=0, column=2) 
     button4.grid(row=0, column=3) 

     a = 1 

    elif a >= 1 and a <= 3: 

     for b in range(len(X0)): 
      for c in range(len(X0[0])): 
       X0[b][c] *= a 
     a += 1 

    else: 

     for b in range(len(X0)): 
      for c in range(len(X0[0])): 
       X0[b][c] *= a 
     a = 1 

    for i in range(len(X0)): 
     for j in range(len(Y0[0])): 
      for k in range(len(Y0)): 
       result0[i][j] += X0[i][k] * Y0[k][j] 

    agrp = LabelFrame(root, text="Process-0", padx=5, pady=5) 
    agrp.grid(row=2, column=1) 

    for r in range(3): 
     for c in range(4): 
      Label(agrp, text=result0[r][c],    
       borderwidth=4).grid(row=r,column=c) 

    root.after(1000, lambda x = a: update(x)) 

def win2(): 
    board = Toplevel() 
    board.title("Message") 
    S = Scrollbar(board) 
    T = Text(board, height=4, width=50) 
    T.pack() 
    S.pack(side=RIGHT, fill=Y) 
    T.pack(side=LEFT, fill=Y) 
    S.config(command=T.yview) 
    T.config(yscrollcommand=S.set) 
    quote = """Yep, this is text""" 
    T.insert(END, quote) 


root = Tk() 
a=0 
update(a) 
root.mainloop()

来源

2016-03-02 user3822607

你为什么重画整个窗口而不是更新显示计算结果的小部件？ – TigerhawkT3

解决方法是每秒不要重新创建小部件。 –

update方法应该只计算和显示更改。

def update(a): 
    if a == 0: 
     a = 1 

    elif a >= 1 and a <= 3: 
     for b in range(len(X0)): 
      for c in range(len(X0[0])): 
       X0[b][c] *= a 
     a += 1 

    else: 
     for b in range(len(X0)): 
      for c in range(len(X0[0])): 
       X0[b][c] *= a 
     a = 1 

    for i in range(len(X0)): 
     for j in range(len(Y0[0])): 
      for k in range(len(Y0)): 
       result0[i][j] += X0[i][k] * Y0[k][j] 

    for r in range(3): 
     for c in range(4): 
      Label(agrp, text=result0[r][c],    
       borderwidth=4).grid(row=r,column=c) 

    root.after(1000, lambda x = a: update(x))

来源

2016-03-02 07:54:43 Zety

谢谢你。这让我从一个重要的重写中解脱出来。 – user3822607

tkinter：下拉菜单不可点击

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