Pop up message to appear when text is highlighted using python?

Question

I want to highlight a given token inside a input text field (We can have several token highlighted) and when the user has the mouse over this token we get up dialogox. I tried the following:

import tkinter as tk
from tkinter import *
class Example(tk.Frame):
    def __init__(self, *args, **kwargs):
        tk.Frame.__init__(self, *args, **kwargs)
        
        self.l1 = tk.Label(self, text="Hover over me")
        self.l2 = tk.Label(self, text="", width=40)
        self.l1.pack(side="top")
        self.l2.pack(side="top", fill="x")
        self.inputText = tk.Text(root, height = 10, width = 70, bg = "light yellow")
        self.inputText.insert('1.0', "token1 token2 token3 etc.")
        self.inputText.pack()
        self.display_annotate = tk.Button(self, height = 2, width = 20, text ="Annotate text", command = lambda: self.add_highlighter())
        self.display_annotate.place(x = 750, y = 20)
        
        print(self.__dict__.keys())


        self.l1.bind("<Enter>", lambda event, text="text": self.on_enter(text=text))
        self.l1.bind("<Leave>", self.on_leave)

    def take_input(self,):
        text_to_annotate = self.inputText.get("1.0", "end-1c")
        print(text_to_annotate)
        return text_to_annotate

    def on_enter(self, text):
        self.l2.configure(text=text)

    def on_leave(self, event):
        self.l2.configure(text="")

    def add_highlighter(self):
        self.inputText.tag_add("start", "1.0", "1.5")
        self.inputText.bind("<Enter>", lambda event, text="ali": self.on_enter(text=text))
        self.inputText.tag_config("start", background= "black", foreground= "white")

if __name__ == "__main__":
    root = tk.Tk()
    scrollb = tk.Scrollbar(root)
    scrollb.pack(side = tk.RIGHT, fill=tk.Y)
    var1 = tk.IntVar()
    var2 = tk.IntVar()
    root.geometry("900x500+10+10")
    root.title('Annotation page')
    Example(root).pack(side="top", fill="both", expand="true")     
    root.mainloop()

It works to highlight the concerned token 1 between the caracters 0 and 5. But it is not working when I haveover the mouse over token 1. noting that it is working for the label.

Any suggestion?

Answer 1

If I got you right, I've added a label when you hover over a token (together with rotating tokens)

import tkinter as tk
from tkinter import *


def on_enter(text, obj, e=None):
    obj.float_lbl = Label(root, text=text)
    obj.float_lbl.place(x=e.x + obj.winfo_x(), y=e.y + obj.winfo_y())


def on_leave(obj, event=None):
    obj.float_lbl.destroy()


class Example(tk.Frame):
    def __init__(self, *args, **kwargs):
        tk.Frame.__init__(self, *args, **kwargs)

        self.l1 = tk.Label(self, text="Hover over me")
        self.l1.pack(side="top")
        # creating new Text object with new methods and properties
        self.inputText = InputText()
        # creating 15 new tokens
        for i in range(15):
            self.inputText.add_token(f"token{i + 1}")
        self.inputText.pack()
        # binding rotate_tag method to button
        self.display_annotate = tk.Button(self, height=2, width=20, text="Annotate text",
                                          command=self.inputText.rotate_tag)
        self.display_annotate.place(x=750, y=20)

        self.l1.bind("<Enter>", lambda event, text="text": on_enter(text=text, e=event, obj=self.l1))
        self.l1.bind("<Leave>", lambda event: on_leave(event=event, obj=self.l1))


class Token:
    """
    Token object for InputText
    """
    def __init__(self, name: str, pos: int, tag_parent: Text):
        self.token_name = name
        self.begin = "1." + str(pos)
        self.end = "1." + str(pos + len(name))
        self.parent = tag_parent
        self.add_tag()
        self.bind_tag()

    def add_tag(self):
        self.parent.tag_add(self.token_name, self.begin, self.end)

    def bind_tag(self):
        self.parent.tag_bind(self.token_name, "<Enter>",
                             lambda event, text="text": on_enter(obj=self.parent, e=event, text=self.token_name))
        self.parent.tag_bind(self.token_name, "<Leave>",
                             lambda event, text="text": on_leave(obj=self.parent, event=event))

    def highlight_tag(self):
        self.parent.tag_config(self.token_name, background='red', foreground='white')

    def disable_tag(self):
        self.parent.tag_config(self.token_name, background='gray', foreground='black')


class InputText(Text):
    """
    Text object with methods to add tokens and rotate tags
    """
    def __init__(self):
        super(InputText, self).__init__(root, height=10, width=70, bg="light yellow")

        self.tokens = []
        self.last = 0
        self.current_tag = None

    def add_token(self, name):
        self.insert(END, name + " ")
        self.tokens.append(Token(name, self.last, self))
        self.last += (1 + len(name))

    def rotate_tag(self):
        if self.current_tag is None:
            self.current_tag = 0
        else:
            self.tokens[self.current_tag - 1].disable_tag()
        self.tokens[self.current_tag].highlight_tag()
        self.current_tag = min(self.current_tag + 1, len(self.tokens) - 1)


if __name__ == "__main__":
    root = tk.Tk()
    scrollb = tk.Scrollbar(root)
    scrollb.pack(side=tk.RIGHT, fill=tk.Y)
    var1 = tk.IntVar()
    var2 = tk.IntVar()
    root.geometry("900x500+10+10")
    root.title('Annotation page')
    Example().pack(side="top", fill="both", expand="true")
    root.mainloop()