def __init__(self, parent, structure, command_stack):
Subscriber.__init__(self, structure)
Observable.__init__(self)
tk.Frame.__init__(self, parent, borderwidth=4, relief="raised")
self._structure = structure
self._command_stack = command_stack
self.bind("<Button-1>", self._on_click)
self.bind("<FocusIn>", self._on_get_focus)
self.bind("<FocusOut>", self._on_lost_focus)
self._tree = Treeview(self,
columns=["#", "X", "Y"],
selectmode="browse")
#kill the icon column
self._tree.column("#0", minwidth=0, width=0)
style = Style()
style.configure("Treeview.Heading", font=(None, 16))
self._tree.column("#", minwidth=20, width=40, anchor=tk.CENTER)
self._tree.column("X", minwidth=20, width=40, anchor=tk.CENTER)
self._tree.column("Y", minwidth=20, width=40, anchor=tk.CENTER)
self._tree.heading("#", text="#")
self._tree.heading("X", text="\u21d5")
self._tree.heading("Y", text="\u21d4")
self._tree.grid(row=0, column=POINTS_TABLE_COL, sticky=tk.N + tk.S)
self._tree.bind("<<TreeviewSelect>>", self._on_point_selected)
self._tree.bind("<FocusIn>", self._on_get_focus)
self._tree.bind("<FocusOut>", self._on_lost_focus)
scroll = Scrollbar(self, command=self._tree.yview)
scroll.grid(row=0, column=SCROLL_COL, sticky=tk.N + tk.S)
scroll.bind("<FocusIn>", self._on_get_focus)
self._tree.configure(yscrollcommand=scroll.set)
self._index_of_sel_point = -1
self._fill_tree()
self._edit_zone = EditZone(self, self._structure, command_stack,
self._on_get_focus)
self._edit_zone.grid(column=EDIT_ZONE_COL, row=0, sticky=tk.N)
