from tkinter import *

class welcome():
    def __init__(self, master): #master: root - the main window
        # welcome and introduction
        self.master=master
        self.master.geometry("500x200")

        self.welcome = Label(self.master, text="Welcome to The Bees's")
        self.welcome.pack()
        self.intro = Label(self.master, text="This is our project for Python course")
        self.intro.pack()
        self.intro2 = Label(self.master, text="This program is use for solving Linear Programming, IP, BIP, mixed... problem")
        self.intro2.pack()

        self.startbutton = Button(self.master, text="Start", bg="yellow")
        self.startbutton.pack()
        self.startbutton.config(command=self.gotoinput)

    def gotoinput(self):
        root2 = Toplevel(self.master)
        self.input1=input(root2)

class input():
    def __init__(self,master):
        self.master=master
        self.master.title("Input")
        self.master.geometry("700x500")
        #cancle
        self.Canclebutton=Button(self.master,text="Cancle",command=self.master.destroy).grid(row=3,column=1)
        #OK
        self.Enterbutton=Button(self.master,text="ENTER",command=self.gotoinput2).grid(row=3,column=2)

    def gotoinput2(self):
        root3=Toplevel(self.master)
        self.input22=input2(root3)

class input2():
    def __init__(self,master):
        self.master=master
        self.master.title("Input2")
        self.master.geometry("700x500")
        # cancle
        self.Canclebutton = Button(self.master, text="Cancle", command=self.master.destroy).grid(row=0, column=0)
        # OK
        self.Solvebutton = Button(self.master, text="Solve!", command=self.gotosolve()).grid(row=0, column=1)
        print("Through")

    def gotosolve(self):
        print("gotosolve")
        root4=Toplevel(self.master)
        self.solve11=solve(root4)

class solve():
    def __init__(self,master):
        self.master = master
        self.master.title("Solution")
        self.master.geometry("700x500")
        # cancle
        self.Canclebutton = Button(self.master, text="Cancle", command=self.master.destroy).grid(row=0,column=0)

def main():
    # create a main window
    root = Tk()
    root.title("The Bees's")

    b = welcome(root)
    # end line
    root.mainloop()

main()