在 Tkinter 中，如何从小部件中移除焦点？

Question

我想手动从小部件中移除焦点。

Answer 1

You can focus to another dummy widget.

Edit

from Tkinter import *

def callback():
    print master.focus()

master = Tk()
e = Entry(master)
e.pack()
e.focus()
b = Button(master, text="get", width=10, command=callback)
b.pack()

master.mainloop()

Focusing on a non-'focusable' widget will remove focus from another widget.

Answer 2

• Set focus to another widget to remove focus from the target widget is a good idea. There are two methods for this: w.focus_set() and w.focus_force() . However, method w.focus_force() is impolite. It's better to wait for the window manager to give you the focus. Setting focus to parent widget or to the root window removes focus from the target widget.
• Some widgets have takefocus option. Set takefocus to 0 to take your widget out of focus traversal (when user hits <Tab> key).

Answer 3

If the dummy widget is Canvas then c.focus() will not work.

use c.focus_set() or c.tk.call('focus',c) to first focus on the canvas window itself.

---

That's because

c.focus()

... returns the id for the item that currently has the focus, or an empty string if no item has the focus. Reference

c.focus(id_) will focus on the item having id id_ within the canvas.

c.focus("") will remove the focus from any item in the canvas.

---

Hence (within some callback)

c.config(highlightthickness = 0) # to remove the highlight border on focus
c.foucs_set()
c.focus("") # just to be sure

---

The reason c.focus() functions differently is that within Tcl/Tk's Commands there's the "Primary" Command focus

as well as the Canvas-specific Widget Command focus

That's not an issue within the Tcl/Tk syntax but in the tkinter module c.focus() will call the underlying canvas-specific foucs .

From tkinter.py within the Canvas class Line 2549

def focus(self, *args):
        """Set focus to the first item specified in ARGS."""
        return self.tk.call((self._w, 'focus') + args)

Answer 4

我的解决方案是root.focus()它将删除小部件焦点。

Answer 5

If you use ttk widgets you can "remove" the focus ring by removing the color; for example on a button:

style = ttk.Style()
style.configure('TButton', focuscolor='')

Answer 6

So the question may be a duplicate here , but the answer from @Bryan Oakley works perfectly for me in Python 3.8

root.focus_set()

Too easy...