Pressing tab with tkinter Listboxes moves the "Active" underscore but not the cursor

Question

l1=Listbox()
l1.pack(side=LEFT)
l1.insert(END, *xrange(1,4))

l2=Listbox()
l2.pack(side=RIGHT)
l2.insert(END, *'abc')

When I press tab, the underscore jumps to the other Listbox, but the cursor only joins in when I start using the up/down arrows. Is it possible to make it hop along together with the underscore, on pressing tab?

Edit: This is done by binding the Tab key to invoke the select_set() method on the active item:

l1.bind('<Tab>', lambda e: l2.select_set(l2.index(ACTIVE)))
l2.bind('<Tab>', lambda e: l1.select_set(l1.index(ACTIVE)))

• l.index(ACTIVE) returns the index of the active item, which is the one with the underscore after Tab is pressed.

• It is then set to be "selected" using l.select_set(), which moves the cursor to it as well.

• the "e" after lambda is required since any function called from a tkinter bind is implicitly given an event object, though it isn't used in any way here.

Hope this comes handy.

Answer 1

下划线和光标表示列表框项目的不同属性 -

• 下划线标记，这是默认的activestyle属性 列表框，显示活动项目。

• 光标用于（a）所选项目。

默认情况下，Tab键交替显示＆＃34;活动＆＃34;在此上下文中的状态，因此它不会影响游标。

要更改光标位置，我们还需要将活动项目设置为（a）所选项目。我已经通过将Tab键绑定到执行此额外操作的lambda函数来完成此操作：

l1.bind('<Tab>', lambda e: l2.select_set(l2.index(ACTIVE)))
l2.bind('<Tab>', lambda e: l1.select_set(l1.index(ACTIVE)))

活动索引作为相应select_set()的参数给出，然后将光标移动到下划线项上。

注意：我认为对于更一般的情况，应使用事件e来获取活动项，而不是直接引用列表框。但是，这似乎适用于2个列表框。