Python tkinter-创建标签,然后将其删除

问题描述 投票:0回答:1

[我想在单击按钮(创建)时一个在另一个标签的下面创建一个标签,然后在另一个实例中单击(删除)的一个实例中删除所有标签。

现在,我正在考虑为标签创建多个名称-只需单击一次即可创建每个名称。因此,如果我单击n次按钮,我将获得n个名称:myLabel1,myLabel2,...,myLabeln

然后,当我单击Delete(删除)按钮时,我会看到类似-myLabel1.destroy(),myLabel2.destroy(),。。。myLabeln.destroy()

我正在努力以-myLabel1 = tk.Label等形式将这些名称分配给标签。我在考虑MATLAB中的eval函数。 Python是否有类似的东西?

是否有更好的方式来做我想做的事?

如果使用.pack()方法,我的标签将一个接一个。但是它们都只分配给myLabel(因为我使用myLabel = tk.Label)。当我使用myLabel.destroy()时,仅删除了label的最后一个实例。

带有.pack()的代码和myLabel的单次使用,其中根据需要形成标签,但仅删除最后一个标签:

import tkinter as tk
from tkinter import ttk
import tkinter.font as tkFont

root = tk.Tk()

def click():
    global myLabel
    myLabel = tk.Label(root, text = e.get())
    myLabel.pack(pady=10)
    e.delete(0,'end')

def delete():
    myLabel.destroy()

e = tk.Entry(root, width = 50)
e.pack(padx = 10, pady = 10)

CreateButton = tk.Button(root, text = 'Enter name', command = click)
CreateButton.pack(pady=10)

DeleteButton = tk.Button(root, text = 'Delete', command = delete)
DeleteButton.pack(pady=40)

root.mainloop()

但是由于这只会删除最后创建的标签,因此我尝试了开头提到的方法-

import tkinter as tk
from tkinter import ttk
import tkinter.font as tkFont

ii = 0

root = tk.Tk()

def click():
    global labelname, ii
    ii += 1
    labelname = 'myLabel' + str(ii)
    print(labelname)
    labelname = tk.Label(root, text = e.get()) # I wanted 'labelname' here to be 'myLabel1'
    e.delete(0,'end')

def delete():
#     for ii in range(1,max(ii)):
    labelname.config(text = '') # I wanted 'labelname' here to be 'myLabeln' in a for loop going from 1 to n

e = tk.Entry(root, width = 50)
e.pack(padx = 10, pady = 10)

CreateButton = tk.Button(root, text = 'Enter name', command = click)
CreateButton.pack(pady=10)

DeleteButton = tk.Button(root, text = 'Delete', command = delete)
DeleteButton.pack(pady=40)

root.mainloop()

也许我以一种非常复杂的方式进行处理,并且有一种更简单的方法,而无需使用For循环等。

请咨询。

谢谢

R

python button tkinter label
1个回答
1
投票

您可以使用此脚本:每个标签的文本都存储在var标签中。

您可以在新行中重新创建一个标签,而不是为每个标签分配一个变量,但是可以通过将其添加到数组或包含所有标签的类似标签中,因此可以随时删除每个标签。

from tkinter import *

win = Tk()                         # create the window

labels = []                        # no labels

def add_label():
    global labels, text
    labels.append(Label(win, text=text.get())) # append a label object to the list
    labels[-1].pack()              # draw the last label

def delete_all_labels():
    global labels
    for label in labels:           # delete all the labels
        label.pack_forget()
    labels = []

text = Entry(win)                  # add the entry
text.pack()

Button(win, text="Create new label", command=add_label).pack()
Button(win, text="Delete all the labels", command=delete_all_labels).pack()

win.mainloop()

填写条目并单击按钮。

您可以使用网格来组织窗口。在这种情况下,请使用grid_forget而不是pack_forget删除标签。

from tkinter import *

win = Tk()                         # create the window

labels = []                        # no labels

                                   # index for method grid()
rowIndex = 2                       # Set to 2 because of the
                                   # buttons and the entry.
                                   # this variable is used to increment
                                   # the y position of the labels so that
                                   # they are drawn one after the other,
                                   # and not on top of each other.

def add_label():
    global labels, text, rowIndex
    labels.append(Label(win, text=text.get())) # append a label object to the list
    rowIndex += 1                  # increment the y position

                                   # draw the added label
    labels[-1]\
            .grid(columnspan=2,    # for align in the middle.
                  row=rowIndex,    # y position specific to this label
                  pady=5)

def delete_all_labels():
    global labels
    for label in labels:           # delete all the labels
        label.grid_forget()        # one by one

    rowIndex = 2                   # reset the vars
    labels = []                    #

label=Label(win, text="Type the text :")
label.grid(column=0, row=0, padx=5)

text = Entry(win)                  # add the entry
text.grid(column=1, row=0, padx=5)
text.focus()                       # focus in entry

Button(win, text="Create new label", command=add_label)\
            .grid(column=0, row=1, padx=5)
Button(win, text="Delete all the labels", command=delete_all_labels)\
            .grid(column=1, row=1, padx=5)

win.mainloop()
© www.soinside.com 2019 - 2024. All rights reserved.