from tkinter import *
import re
import tkinter as tk

class HoverInfo(Menu):
    def __init__(self, parent, text, command=None):
       self._com = command
       Menu.__init__(self,parent, tearoff=0)
       if not isinstance(text, str):
          raise TypeError('Trying to initialise a Hover Menu with a non string type: ' + text.__class__.__name__)
       toktext=re.split('n', text)
       for t in toktext:
          self.add_command(label = t)
          self._displayed=False
          self.master.bind("<Enter>",self.Display )
          self.master.bind("<Leave>",self.Remove )

    def __del__(self):
       self.master.unbind("<Enter>")
       self.master.unbind("<Leave>")

    def Display(self,event):
       if not self._displayed:
          self._displayed=True
          self.post(event.x_root, event.y_root)
       if self._com != None:
          self.master.unbind_all("<Return>")
          self.master.bind_all("<Return>", self.Click)

    def Remove(self, event):
     if self._displayed:
       self._displayed=False
       self.unpost()
     if self._com != None:
       self.unbind_all("<Return>")

    def Click(self, event):
       self._com()



def HelloWorld():
    print('Hello World')


def vp_start_gui():
    global val, w, root, o
    root = Tk()
    canvas = tk.Canvas(root)
    scroll = tk.Scrollbar(root, orient='horizontal', command=canvas.xview)
    canvas.configure(xscrollcommand=scroll.set)
    frame = tk.Frame(canvas) # frame does not get pack() as it needs to be embedded into canvas throught canvas.
    scroll.pack(side='bottom', fill='x')
    canvas.pack(fill='both', expand='yes')
    canvas.create_window((0,0), window=frame, anchor='nw')
    frame.bind('<Configure>', lambda x: canvas.configure(scrollregion=canvas.bbox('all'))) # lambda function

    journal = tk.Text(frame, width = 75, height = 39)
    journal.configure(background="#f2f2f2")
    journal.configure(borderwidth="3")
    journal.configure(relief="groove")
    journal.grid() # grid instead
    journal.insert("end", "I want tooltip over this text only")
    hover = HoverInfo(journal,'while hovering press return n for an exciting msg', HelloWorld)


    root.mainloop()


if __name__ == '__main__':
    vp_start_gui()