Question

我正在练习一个简单的登录系统。我有一个主程序窗口，我想在登录窗口出现时隐藏它。输入正确的密码后，我想要破坏登录窗口并重新出现主窗口（取消图标）。

主程序代码（LibrarySQL.py）：

from tkinter import *
import libraryentrySQL, librarydatabase, login
import sqlite3
import os



def click():
    entered_text = entry.get() #collect text from text entry box
    output.delete(0.0,END) #clears text box - start clearing from 0.0 (from line 0) to END (after last character)
    new_db = sqlite3.connect('dictionary.db')
    c=new_db.cursor()
    c.execute("SELECT definition FROM Dictionary WHERE word = ?", (entered_text,))
    for row in c:
        definition = row[0]
        break
    else:
        definition = "No word found in dictionary, try again!"

    output.insert(END, definition) #this inserts the contents of variable 'definition' at the beginning (END) - because it was cleared before, END is the at the start

def clickentry(): #this function is run when the 2nd button (entry is pressed)
    def definition_submitted(word, definition):
        new_db = sqlite3.connect('dictionary.db')
        c=new_db.cursor()
        c.execute("INSERT INTO Dictionary VALUES (?, ?)", (word, definition))
        new_db.commit()
        new_db.close()

    definition_window = libraryentrySQL.DefinitionWindow(window, definition_submitted) #this creates the object 'definition window' and passes to it 'the window variable'
                                                                                        #so that it can have a canvas
def clickdataview():
    new_db = sqlite3.connect('dictionary.db')
    c=new_db.cursor()
    c.execute("SELECT * FROM Dictionary")
    data = c.fetchall()
    count = len(data)
    database_window =  librarydatabase.DatabaseWindow(window, count, data)
    new_db.close()

def login_window(window):
    log = login.Login(window)



window = Tk()


login_window(window)

window.withdraw()

window.deiconify()


window.title("My Little Dictionary")

#Create the Label
Label(window, text="Enter the word you want defining:").grid(row=0, column=0, sticky=W)

#create entry box
entry=Entry(window, width=20, bg="light green")
entry.grid(row=1, column=0, sticky=W)

#create submit button
Button(window, text="Submit", width=5, command=click).grid(row=2, column=0, sticky=W)

#create second label
Label(window, text="\nDefinition").grid(row=3, column=0, sticky=W)

#create text box
output=Text(window, width=75, height=6, wrap=WORD, background="light green")
output.grid(row=4, column=0, sticky=W)

#create submit button to open enter new definition window
Button(window, text="Enter a New Definition", width=20, command=clickentry).grid(row=5, column=0, sticky=W)

#create open database button to open database view window
Button(window, text="View Dictionary", width=20, command=clickdataview).grid(row=6, column=0, sticky=W)


#Create the Dictionary.db if not already present
if not os.path.isfile("dictionary.db"):
    new_db = sqlite3.connect('dictionary.db')
    c=new_db.cursor()

    c.execute('''CREATE TABLE Dictionary
    (word text,
    definition text)''')

    c.execute('''INSERT INTO Dictionary VALUES
    ('Algorithm', 'Step by step instructions to complete a task')''')

    new_db.commit()
    new_db.close()

window.mainloop()

登录类代码（login.py）：

from tkinter import *

class Login(Toplevel):
    def __init__(self, window):
        Toplevel.__init__(self, window)
        self.title("Current Library")

        Label(self, text="Log in to use this program:").grid(row=0, column=0, sticky=W)

        self.userbox=Entry(self, width=20, bg="light green")
        self.userbox.grid(row=1, column=0, sticky=W)

        self.passbox=Entry(self, width=20, bg="light green")
        self.passbox.grid(row=2, column=0, sticky=W)

        Button(self, text="Submit", width=5, command=self.clicked).grid(row=3, column=0, sticky=W)


    def clicked(self):
        username = self.userbox.get()
        password = self.passbox.get()
        if password == "password":
            self.correct = True
            self.destroy()
        else:
            pass

我确切地知道问题所在：由于主循环中的指令顺序，主窗口隐藏然后立即重新出现。因此，如何正确输入密码，我可以如何隐藏主要内容并显示登录窗口？之后我希望登录窗口销毁，主要重新出现？

感谢任何帮助。

Answer 1

您可以修改Toplevel实例的clicked()方法来调用deiconify，这样只有在Toplevel被销毁时才会调用它。

class Login(Toplevel):
    def __init__(self, window):
        Toplevel.__init__(self, window)

        # this is the parent/root window
        self.window = window

        Button(self, text='show main', command=self.click).pack()

    def click(self):

        self.destroy()          # destroy the toplevel
        self.window.deiconify() # and restore the root window

在你的主要模块中：

root = Tk()

# make the login instance
Login(root)

# withdraw the main window
root.withdraw()

# set up widgets in main window
...

mainloop()

如何使用另一个Toplevel窗口登录时隐藏主tkinter程序窗口？

1 个答案: