tkinter_treeview_tooltip.py

class TreeviewTooltip:

    def __init__(self, treeview, texts=[]):
        self._treeview = treeview
        self._texts = texts
        self._tooltip_window = None
        self._tooltip_x = self.tooltip_y = 0
        self._last_idd = self._last_col = None
        self._waittime = 500
        self._id = None
        self._style = ttk.Style()
        self._treeview.bind("<Motion>", self.schedule)

    @property
    def treeview(self):
        return self._treeview

    @property
    def texts(self):
        return self._texts

    @texts.setter
    def texts(self, value):
        self._texts = value

    def schedule(self, event):
        self.unschedule()
        idd = self._treeview.identify_row(event.y)
        col = self._treeview.identify_column(event.x)
        if not idd or not self._texts[int(idd)][int(col.strip("#"))-1]:
            if self._tooltip_window:
                self.hide()
            return
        if idd == self._last_idd and col == self._last_col:
            return
        if self._tooltip_window:
            self.hide()
        self._id = self._treeview.after(self._waittime, lambda: self.show(event))

    def unschedule(self):
        id = self._id
        self._id = None
        if id:
            self._treeview.after_cancel(id)

    def show(self, event):
        idd = self._treeview.identify_row(event.y)
        col = self._treeview.identify_column(event.x)
        #x, y, cx, cy = self.bbox("insert")
        x, y, cx, cy = self._treeview.bbox(idd, column=col)
        #x = event.x
        x = x + self._treeview.winfo_rootx() + 1
        y = y + cy + self._treeview.winfo_rooty() #+ 20#- 3# + 20
        width = self._treeview.column(f'{int(col.strip("#"))-1}')['width']
        height = self._style.lookup("Treeview", "rowheight")
        self._tooltip_window = tk.Toplevel(self._treeview)
        self._tooltip_window.wm_overrideredirect(1)
        self._tooltip_window.wm_geometry(f"+{x}+{y}")
        try:
            # For Mac OS
            self._tooltip_window.tk.call("::tk::unsupported::MacWindowStyle",
                                         "style", self._tooltip_window._w,
                                         "help", "noActivates")
        except tk.TclError:
            pass
        if self._treeview.tag_has("bold", idd):
            weight="bold"
        else:
            weight="normal"
        label = tk.Label(self._tooltip_window,
                         text=self._texts[int(idd)][int(col.strip("#"))-1],
                         justify=tk.LEFT, background="#ffffe0",
                         relief=tk.SOLID, borderwidth=1,
                         font=(FONTNAME, "13", weight),
                         wraplength=width)
        label.grid(ipadx=1, ipady=2, sticky="n")
        self._last_idd = idd
        self._last_col = col

    def hide(self):
        if self._tooltip_window:
            self._tooltip_window.destroy()
        self._tooltip_window = None
        self._last_idd = self._last_col = None