from tkinter import Tk, Toplevel, TclError, Label, Button


class Hovertip(object):
    def __init__(self, widget, text, delay):
        self.widget = widget
        self._tipwindow = None

        self._render_id = None
        self._tooltip_text = text
        self._tooltip_delay = delay

        self._enter_bind = self.widget.bind("<Enter>", self.show)
        self._leave_bind = self.widget.bind("<Leave>", self.hide)
        self._button_bind = self.widget.bind("<Button>", self.hide)

    def __del__(self):
        try:
            self.widget.unbind("<Enter>", self._enter_bind)
            self.widget.unbind("<Leave>", self._leave_bind)
            self.widget.unbind("<Button>", self._button_bind)
        except TclError:
            pass

    def show(self, _):
        def render():
            if not self._tipwindow:
                self._tipwindow = tw = Toplevel(self.widget)
                tw.wm_overrideredirect(True)

                x, y = 20, self.widget.winfo_height() + 1
                root_x = self.widget.winfo_rootx() + x
                root_y = self.widget.winfo_rooty() + y
                self._tipwindow.wm_geometry("+%d+%d" % (root_x, root_y))

                label = Label(
                    self._tipwindow,
                    text=self._tooltip_text,
                    justify='left',
                    background="#ffffe0",
                    relief='solid',
                    borderwidth=1
                )
                label.pack()
                self._tipwindow.update_idletasks()  # Needed on MacOS -- see #34275.
                self._tipwindow.lift()

        if self._tooltip_delay:
            if self._render_id:
                self.widget.after_cancel(self._render_id)
            self._render_id = self.widget.after(self._tooltip_delay, render)
        else:
            render()

    def hide(self, _):
        try:
            if self._render_id:
                self.widget.after_cancel(self._render_id)
        except TclError:
            pass

        tw = self._tipwindow
        self._tipwindow = None
        if tw:
            try:
                tw.destroy()
            except TclError:
                pass


def app(parent):
    top = Toplevel(parent)
    top.title("Test tooltip")
    x, y = map(int, parent.geometry().split('+')[1:])
    top.geometry("+%d+%d" % (x, y + 150))

    label = Label(top, text="Place your mouse over buttons")
    label.pack()

    button1 = Button(top, text="Button 1 -- 1/2 second hover delay")
    button1.pack()
    Hovertip(button1, "This is tooltip text for button1.", delay=1000)

    button2 = Button(top, text="Button 2 -- no hover delay")
    button2.pack()
    Hovertip(button2, "This is tooltip\ntext for button2.", delay=0)


if __name__ == '__main__':
    tk = Tk()

    app(tk)

    tk.mainloop()