mvce.py

from Tkinter import *

class GUI():
    def __init__(self):
        self.root = Tk()
        self.active_window = None
        self.main_Canvas = None

    def create_main_window(self): #creates the main window
        self.root.config(bg="white")
        self.root.title("pyEncryptor")
        self.root.geometry("400x400")
        self.main_Canvas = Canvas(self.root, bg="white")
        self.main_Canvas.pack(side=TOP, fill=BOTH, expand=1)
        F1 = Frame(self.main_Canvas, bg="red")
        F1.grid(row=0, column=0, sticky=NW, ipadx=100, ipady=100)
        F2 = Frame(self.main_Canvas, bg="blue")
        F2.grid(row=0, column=1, sticky=NE, ipadx=100, ipady=100)
        F3 = Frame(self.main_Canvas, bg="green")
        F3.grid(row=1, column=0, sticky=SE, ipadx=100, ipady=100)
        F4 = Frame(self.    main_Canvas, bg="yellow")
        F4.grid(row=1, column=1, sticky=SW, ipadx=100, ipady=100)
        F1.bind("<Button-1>", self.options_1)
        F2.bind("<Button-1>", self.options_2)
        F3.bind("<Button-1>", self.options_3)
        F4.bind("<Button-1>", self.options_4)
        self.root.mainloop()


    def options_1(self, event):
        self.create_window(event)
        overlay = self.active_window
        L=Label(overlay, text="This is an example after clicking the red square")
        L.pack(padx=5, pady=10)
    def options_2(self, event):
        self.create_window(event)
        overlay = self.active_window
        L=Label(overlay, text="This is an example after clicking the blue square\n but this one is a little bit bigger")
        L.pack(padx=5, pady=10)
    def options_3(self, event):
        self.create_window(event)
        overlay = self.active_window
        L=Label(overlay, text="This is an example after clicking the green square")
        L.pack(padx=5, pady=10)
    def options_4(self, event):
        self.create_window(event)
        overlay = self.active_window
        L=Label(overlay, text="This is an example after clicking the blue square\nbut this one is much\nmuch\nmuch\nmuch\nmuch\nmuch\nmuch\nBIGGER")
        L.pack(padx=5, pady=10)

    def create_window(self, event): #create overlayed canvas
        if self.active_window != None:
            self.clear_window(Event())
            self.active_window = None
        window = Canvas(self.main_Canvas, bg="white", relief="groove", highlightbackground="black", highlightcolor="black", highlightthickness=1, borderwidth=4)
        window.place(x=self.root.winfo_pointerx() - self.root.winfo_rootx()-100, y=self.root.winfo_pointery() - self.root.winfo_rooty())
        windowFrame = Frame(window)
        windowFrame.pack(fill=BOTH, expand=1, padx= 5, pady=5)
        self.active_window = window
        return "break"
    def clear_window(self, event): #clear overlayed canvas
        if self.active_window != None:
            self.active_window.destroy()

if __name__ == "__main__":
    app = GUI()
    app.create_main_window()