Python Tkinter获取选中单选按钮文本值及内容同步实现

我在Python Tkinter项目中使用单选按钮供用户选择，选中单选按钮时会向Entry组件填充对应文本。需要实现两个功能：

• 获取当前选中单选按钮的文本值
• 当用户修改Entry组件中的文本时，同步更新对应的文本消息变量

我曾尝试获取frameBtm的子元素列表，但无法判断哪个单选按钮处于选中状态。

初始代码 #

from tkinter import  ttk
from tkinter import *

import yagmail

root=Tk()
root.title('send bunch of inquiry emails')
#frame entry for search and button
frameUpper=Frame(master=root,borderwidth=3,relief='flat',padx=12,pady=12)
frameUpper.grid(row=0,column=0,sticky=(E,W))
#frame for text to send via email
frameBtm=Frame(master=root,borderwidth=3,relief='groove',padx=12,pady=12,width=200,height=100)
frameBtm.grid(row=1,column=0,sticky=(N,S,E,W))

frm_emails=ttk.Frame(master=root,padding=3,borderwidth=3,width=300,relief='sunken')

var_inp=StringVar()
lbl_search=Label(master=frameUpper,text='enter search keyword:')
entry_search=Entry(master=frameUpper,width=33,textvariable=var_inp,relief='groove')

#text editor
txt_greetings='Hi,'
search_variable='keyword'
txt_body=f'I would like to have price information for {search_variable} for our company located in Azerbaijan'
txt_regards='Kind regards,'
btn_radio=StringVar()
btn_radio_greeting=ttk.Radiobutton(master=frameBtm,text='Greetings',variable=btn_radio,value=txt_greetings)
btn_radio_body=ttk.Radiobutton(master=frameBtm,text='Body',variable=btn_radio,value=txt_body)
btn_radio_regards=ttk.Radiobutton(master=frameBtm,text='Regards',variable=btn_radio,value=txt_regards)
lbl_text_message=Label(master=frameBtm,text='text message for email')
entry_msg_txt=StringVar()
entry_text=Entry(master=frameBtm,textvariable=entry_msg_txt,borderwidth=1,width=20)

def func_x():
    frm_emails.grid(row=2,sticky=(S,E,W))
    Label(master=frm_emails, text=no_duplicates,wraplength=200).pack()

lbl_search.grid(sticky=(E,W))
entry_search.grid(sticky=(E,W))
entry_search.bind('<Return>', start_scraping)
Button(master=frameUpper, width=13, command=start_scraping, text='run').grid(pady=5)

btn_radio_greeting.grid(row=1,column=0,sticky=(W,))
btn_radio_body.grid(row=2,column=0,sticky=(W,))
btn_radio_regards.grid(row=3,column=0,sticky=(W,))

btn_radio_greeting.bind('<Double-1>',change_value_btn_greetings)
btn_radio_body.bind('<Double-1>',change_value_btn_body)
btn_radio_regards.bind('<Double-1>',change_value_btn_regards)

lbl_text_message.grid(row=0,column=0,rowspan=1,columnspan=1,sticky=(W))
entry_text.grid(row=1,column=1,rowspan=3,columnspan=3,sticky=(N,S,E,W))

root.columnconfigure(0,weight=1)
root.rowconfigure(1,weight=1)

frameUpper.columnconfigure(0,weight=1)

frameBtm.columnconfigure(0,weight=1)
frameBtm.rowconfigure(0,weight=1)
frameBtm.columnconfigure(1,weight=5)
frameBtm.rowconfigure(1,weight=5)
lbl_text_message.rowconfigure(0,weight=1)
lbl_text_message.columnconfigure(0,weight=1)
entry_text.rowconfigure(1,weight=5)
entry_text.columnconfigure(1,weight=5)

frm_emails.rowconfigure(0,weight=1)
frm_emails.columnconfigure(0,weight=1)
    ##newly added lines
def get_value_from_entry_txt_put_to_variable(event):
    global txt_greetings
    global txt_body
    global txt_regards
    global txt_message_to_send
    if btn_radio_regards.winfo_viewable()==1:
        txt_regards = entry_msg_txt.get()
    elif btn_radio_body.winfo_viewable()==1:
        txt_body = entry_msg_txt.get()
    elif btn_radio_greeting.winfo_viewable()==1:
        txt_greetings = entry_msg_txt.get()
    print(txt_message_to_send)
    txt_message_to_send = txt_greetings + '\n' + txt_body + '\n' + txt_regards
    test_print()

entry_text.bind('<Return>',get_value_from_entry_txt_put_to_variable)
# send emails
txt_message_to_send=txt_greetings+'\n'+txt_body+'\n'+txt_regards
def test_print():
    print(txt_message_to_send)

if __name__=='__main__':
    root.mainloop()

尝试的方法 #

我尝试获取frameBtm的子元素列表，但无法判断哪个单选按钮处于选中状态：

a=[x for x in frameBtm.winfo_children()]
print(a)
# 输出：[<tkinter.ttk.Radiobutton object .!frame2.!radiobutton>, <tkinter.ttk.Radiobutton object .!frame2.!radiobutton2>, <tkinter.ttk.Radiobutton object .!frame2.!radiobutton3>, <tkinter.Label object .!frame2.!label>, <tkinter.Entry object .!frame2.!entry>]

解决方案 #

在@Brian Oakley的帮助下，问题得以解决：通过绑定Entry组件的回车键事件，使用btn_radio.get()方法结合条件判断确定选中的单选按钮，实现内容同步更新。

解决代码如下：

def get_value_from_entry_txt_put_to_variable(event):
    global txt_greetings
    global txt_body
    global txt_regards
    global txt_message_to_send
    print(btn_radio.get())
    if btn_radio.get()==txt_regards:
        print('btn_radio_regards')
        txt_regards = entry_msg_txt.get()
    elif btn_radio.get()==txt_body:
        print('btn_radio_body')
        txt_body = entry_msg_txt.get()
    elif btn_radio.get()==txt_greetings:
        print('btn_radio_greeting')
        txt_greetings = entry_msg_txt.get()
    print(txt_message_to_send,'---')
    txt_message_to_send = txt_greetings + '\n' + txt_body + '\n' + txt_regards
    print(txt_message_to_send, '-+-')
    test_print()

entry_text.bind('<Return>',get_value_from_entry_txt_put_to_variable)

内容的提问来源于stack exchange，提问作者xlmaster