Tkinter Entry Autocomplete

from tkinter import *

class AutoComplete():
    def __init__(self, root):
        self.root = root
        self.root.bind("<Button-1>", self.mouseClick)
        self.root.geometry("1000x600")
        self.active_window = None
        self.button = [None]*1000
        self.input = None
    def set_entry(self, event, text, stringvar):
        stringvar.set(text)
        self.close_overlay(Event())
        self.input.icursor(len(text))
    def set_button_colour(self, event, button, state):
        if state:
            button.configure(bg="#BBBBBB")
        else:
            button.configure(bg="#DDDDDD")
    def mouseClick(self, event):
        mous_over_button = False
        if self.input != None:
            for i in range(len(self.button)):
                if self.button[i] != None:
                    if event.widget == self.button[i]:
                        mous_over_button = True
            if mous_over_button:
                pass
            elif event.widget == self.input or event.widget == self.active_window:
                self.autocomplete(event, self.sv, self.options)
            else:
                self.close_overlay(event)

    def autocomplete(self, event, sv, options):
        intxt = sv.get()
        valid = []
        if len(intxt) >2 :
            for opt in options:
                if(opt[0:len(intxt)].lower() == intxt.lower()):
                    valid.append(opt)
            if len(valid) > 0:
                xpos = self.input.winfo_rootx() - self.root.winfo_rootx()
                ypos = self.input.winfo_rooty() - self.root.winfo_rooty() + self.input.winfo_height()
                activeoverlay = self.overlay(self.root, width=self.input.winfo_width(), x=xpos, y=ypos)
                button_height = 2
                buttonFrame = Frame(activeoverlay, padx=2, pady=2, borderwidth=2, highlightbackground="black", relief="ridge")
                buttonFrame.pack(side=TOP, fill=BOTH, expand=1)
                for i in range(len(valid)):
                    self.button[i] = Button(buttonFrame, text=valid[i], height=1, command=lambda e=Event(), t=valid[i], tv=sv: self.set_entry(e, t, sv), width=100, bg="#DDDDDD", fg="black", borderwidth=0, relief=None)
                    self.button[i].pack(fill=X)
                    self.button[i].bind("<Enter>", lambda e=Event(), b=self.button[i], s=True: self.set_button_colour(e, b, s))
                    self.button[i].bind("<Leave>", lambda e=Event(), b=self.button[i], s=False: self.set_button_colour(e, b, s))
                    main_height=self.button[i].winfo_height()
                for but in self.button:
                    if but != None:
                        but.update()
                        lastbut = but
                self.active_window.configure(height=lastbut.winfo_height()*len(valid))
                self.active_window.update()
            else:
                self.close_overlay(Event())
        else:
            self.close_overlay(Event())
    def close_overlay(self, event):
        if self.active_window != None:
            self.button = [None]*1000
            self.active_window.pack_forget()
            self.active_window.destroy()
            self.active_window = None
    def overlay(self, over, width=100, x=0, y=0): ##the overlay to hold the selection options
        if self.active_window != None:
            self.close_overlay(Event())
        self.active_window = Canvas(over, width=width, bg="white", borderwidth=2, relief="raised")
        self.active_window.pack_propagate(False)
        self.active_window.place(x=x, y=y)
        self.root.update_idletasks()
        self.root.update()
        return self.active_window

    def autocomplete_Entry(self, holder, vals): ##the modified Widget
        self.sv = StringVar()
        self.options = vals
        self.sv.trace("w", lambda name, index, mode, sv=self.sv, opt=self.options, e=Event(): self.autocomplete(e, sv, opt))
        self.input=Entry(holder, textvariable=self.sv)
        self.input.pack()
        #self.input.bind("<FocusOut>", lambda e=Event(): self.close_overlay(e))
        return self.input, self.sv



    ##Just for texting
    def run(self):
        self.window = Frame(self.root)
        self.window.pack(fill=BOTH, expand=1) #
        options = ["apple", "apple1", "apple2", "apple3", "apple4", "apple5", "apple6", "apple7", "banana", "pare", "peach", "strawberry", "melon"]
        entry = self.autocomplete_Entry(self.window, options)
        self.root.mainloop()
if __name__ == "__main__":
    root = Tk()
    AutoComplete(root).run()