from tkinter import *
username = ""
userpass = ""
class login:
    frame = None
    #master = None
    mes = None
    def __init__(self,master):
        self.frame = Frame(master)
        #self.master = master
        self.frame.pack()
        self.email_label = Label(self.frame,
                           text = "e-mail").grid(row = 0)
        self.password_label = Label(self.frame,
                              text = "password").grid(row = 1)

        self.email_entry = Entry(self.frame,text = "")
        self.email_entry.grid(row = 0,
                            column = 1)
        self.password_entry = Entry(self.frame,
                                 show = '*', text = "")
        self.password_entry.grid(row = 1,
                                column = 1)



        self.button = Button(self.frame,
                             text = "Log In",
                             command = self.switch_scr).grid(row =2)



    def switch_scr(self):
        if(self.email_entry.get() != username
           or self.password_entry.get() != userpass):

            mes = Message(self.frame,
                          text = "Access denied",
                          width = 100,
                          fg = "red").grid(row = 2,
                                           column = 1,
                                           columnspan = 2)


        else:
            self.frame.pack_forget()

            mainscreen.frame.pack()
            mes = Message(self.frame,
                          text = "Access granted",
                          width = 100,
                          fg = "green").grid(row = 2,
                                           column = 1,
                                           columnspan = 2)

class mainscreen:
    frame = None
    def __init__(self,master):
        self.frame = Frame(master)
        self.frame.pack_forget()
        self.scrollbar = Scrollbar(master)
        self.scrollbar.pack(side=RIGHT)
        self.listbox = Listbox(self.frame,
                               yscrollcommand= self.scrollbar.set ,
                               width = "85",
                               height = "21",
                               borderwidth=0)

        for l in range(100):

            self.labelframe = LabelFrame(self.listbox,text = "email " + str(l), width = "780")
            self.labelframe.pack(side = "top", fill = 'both',padx = 5,pady = 5)
            self.label = Label(self.labelframe,
                           text = "text of" + str(l),width = "760")
            self.listbox.insert(END, self.labelframe)
            self.label.pack(side = "left", fill = 'both',padx=5, pady=5)


        self.listbox.pack()
        self.scrollbar.config(command=self.listbox.yview)
        self.button = Button(self.frame,
                                 text = "back",
                                 command = self.back)

        self.button.pack(side = 'bottom')

    def back(self):
        self.frame.pack_forget()
        login.frame.pack()


root = Tk()
root.geometry("800x400")

mainscreen = mainscreen(root)
login = login(root)
root.title("CollabOK v1.0")


root.mainloop()