import tkinter as tk

icomove = '''
iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAMAAABEpIrGAAABMlBMVEX///8AAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAABDRUUAAABNUU9fYmJjZmVaXlxnbGpqbmu4vL3b3d7Cw8PP0NCNkI2OkJCSlpSZm5uZnJ
qgoaGlpqapqamqq6urq6utra2urq6vr6+wsLCysrK2tra5ubm6vr+7u7vBwcHCwsLDxMPIyMjLy8vNz
c3Ozs7P0NDW1tbY2Njb29vb3d7c3Nvh4eHi4uLj4+Pk5OTl5eXn6Ojo6enp6enp6urp6uvq6+vr6+vr
7Ozs7Ozs7e3t7e3t7u7u7u7u7+/u8PHv7+/v8PDw8PDw8fHx8fHx8fLx8vLy8vLy8/Pz8/Pz9PT09PT
09fX19fX19vb29vb29/f39/f3+Pj4+Pj5+fj5+fn6+vn6+vr6+/v7+/v8/Pz9/f3+/v4I2c3KAAAAFX
RSTlMAAQIDJTtFS0x4gZKYpq62xPf6/v7RkfSJAAABnUlEQVR42o2Tg4IjQRBA17vJ2Q7PVmxb45moB
/n/X7iurvGcahG8l64XHf17zi6vonN55gmX2nS+4nhBFCVJVlRVgzEufcK0XKm32p3eYDSeTGezBcza
J1wtao0Ww9PZYrlacRzHc5srn8AxDhg2CaJEZxf3Uq74Vrc/mkwpplBWFNqhkqSXciV04eFLwApN3MA
Yz72UK4nyxYoXJAXobrcjhJgvnBQQGBdlVaOU4JgJTGGCAlxSHGzAWElMYYI2s7lDDZMKmILCkheRA8
Ox0pjChDUnyD5uwRzSFDvCRpBU5IhRwBQU6AKbA8LJsBQUdhIs8HG4yGIKCs4BDFsGkQRJz+ImW8ADm
GDuRtVivvDjlV/QNu4Bptb8+vHD5y9PDVaCAmEb8ADSfnuwSOmxaadcMmGNG+CAZf6ltS8+Mp0UFCAB
Nxjt79lt7oHlpNy9CAmk+u3Nz4eWk3L/+ikVLgPCp/dPTDflxskRCKb3EhnD18+8lFsn/i9OPJ1KpzO
Zd17K7eMj30RTbvp5NOXeNT+PptyJ/eM7fH703/MLSVTu/2Cp7PcAAAAASUVORK5CYII=
'''

class DragWin(tk.Toplevel):
    def __init__(self, parent: callable, *args, **kwargs):
        super().__init__(parent, *args, **kwargs)
        self.overrideredirect(True)
        self.lift()
        self.wm_attributes('-topmost', True)
        self.ico = tk.PhotoImage(data=icomove)
        lbl = tk.Label(self, image=self.ico, bg='white')
        lbl.grid(row=0, column=0)

class DragDropElement:
    def __init__(self, obj: callable, tipe: str='text', *args, **kwargs):
        self.obj = obj
        self._dragable = True
        self._dropable = True
        self.obj.dropable = True
        self.tipe = tipe
        self.obj.tipe = self.tipe
        self.obj.drop_data = self.drop_data
        self.mwin = None
        self.obj.bind("<Button-3>", self._on_press)
        self.obj.bind("<B3-Motion>", self._on_motion)
        self.obj.bind("<ButtonRelease-3>", self._on_release)

    @property
    def dragable(self) -> bool:
        return self._dragable
    @dragable.setter
    def dragable(self, value: bool) -> None:
        self._dragable = value

    @property
    def dropable(self) -> bool:
        return self._dropable
    @dropable.setter
    def dropable(self, value: bool) -> None:
        self._dropable = value

    def _on_press(self, evt: callable) -> None:
        if not self._dragable: return
        x,y = self.obj.winfo_pointerxy()
        self.mwin = DragWin(self.obj)
        self.mwin.geometry(f'+{x}+{y}')

    def _on_motion(self, evt: callable) -> None:
        if not self._dragable: return
        x, y = self.obj.winfo_pointerxy()
        self.mwin.geometry(f'+{x}+{y}')

    def _on_release(self, evt: callable) -> None:
        if not self._dragable: return
        self.mwin.destroy()
        self.mwin = None
        x, y = self.obj.winfo_pointerxy()
        obj = self.__verify_to_coords((x,y))
        if obj and hasattr(obj, 'dropable'):
            txt = self.obj.get()
            obj.drop_data(self.tipe, txt)

    def __verify_to_coords(self, c2: tuple) -> callable:
        top = self.__get_top(self.obj)
        if not top: return
        w = top.winfo_containing(*c2)
        return top._nametowidget(w)

    def __get_top(self, wdg: callable) -> callable:
        p = wdg.winfo_parent()
        w = wdg._nametowidget(p)
        if w:
            if isinstance(w, tk.Tk):
                top = w
            else:
                top = self.__get_top(w)
        else:
            top = None
        return top

    def drop_data(self, descriptor, data: any) -> None:
        if not self._dropable: return
        if descriptor != self.obj.tipe: return
        if self.tipe == 'text':
            if self.obj.get():
                data = ' ' + data
            self.obj.insert(tk.END, data)


class WinDest(tk.Toplevel):
    def __init__(self, parent, *args, **kwargs):
        super().__init__(parent, *args, **kwargs)
        self.parent = parent
        lbl = tk.Label(self, text='Casella destinazione :')
        lbl.grid(row=0, column=0, padx=5, pady=5, sticky='w')
        en = tk.Entry(self)
        en.grid(row=0, column=1, padx=5, pady=5, sticky='ew')
        self.e_test = DragDropElement(en)
        self.e_test.dragable = False  # commentare x attivare

    def message(self, msg):
        self.dida.configure(text=msg)
        self.update()


class WinTest(tk.Tk):
    def __init__(self):
        super().__init__()
        lbl = tk.Label(self, text='Casella sorgente :')
        lbl.grid(row=0, column=0, padx=5, pady=5, sticky='w')
        en = tk.Entry(self)
        en.grid(row=0, column=1, padx=5, pady=5, sticky='ew')
        self.e_test = DragDropElement(en)
        self.e_test.dragable = False
        pn_bt = tk.Frame(self)
        pn_bt.grid(row=1, column=0, columnspan=2, padx=5, pady=5, sticky='ew')
        self.bt_active = tk.Button(pn_bt, text='Attiva', command=self._on_active)
        self.bt_active.grid(row=0, column=0, padx=(5,2), pady=5, sticky='ew')
        bt_close = tk.Button(pn_bt, text='Chiudi', command=self.destroy)
        bt_close.grid(row=0, column=1, padx=(2,5), pady=5, sticky='ew')
        pn_bt.grid_columnconfigure(0, weight=1, uniform='bt')
        pn_bt.grid_columnconfigure(1, weight=1, uniform='bt')
        self.grid_rowconfigure(0, weight=1)
        self.grid_columnconfigure(0, weight=1)

    def _on_active(self):
        self.e_test.dragable = not self.e_test.dragable
        if self.e_test.dragable:
            self.bt_active.configure(text='Disattiva')
        else:
            self.bt_active.configure(text='Attiva')

    def message(self, msg):
        self.dida.configure(text=msg)
        self.update()


if __name__ == '__main__':
    app = WinTest()
    w = WinDest(app)
    app.mainloop()
    # Questo OK