gtk.TreeViewColumn 不是窗口小部件，所以他们很遗憾没有专门的尺寸变更信号。但是您可以注册一个回调函数，该函数接收宽度更改通知：

  def onColWidthChange（col，width）：
＃请注意，width是一个GParamInt对象，不是整数
 ... 

 col.connect（notify :: width，onColWidthChange）
 

在这个例子中， col 必须是 gtk.TreeViewColumn 对象。如果你没有在代码中初始化列，你可以使用 gtk.TreeView.get_column 获取这些对象。

如果你只有当treeview改变它的大小时才需要通知，你可以使用它的size-allocate信号。

What signal can I catch to detect when a column changes size in a gtk.TreeView? I can't seem to find it in the docs.

gtk.TreeViewColumns aren't widgets so they unfortunately don't have a dedicated signal for size changes. But you can register a callback function that receives "width" change notifications:

def onColWidthChange(col, width):
    # Note that "width" is a GParamInt object, not an integer
    ...

col.connect("notify::width", onColWidthChange)

In the example, col must be a gtk.TreeViewColumn object. If you don't initialize the columns in code, you can use gtk.TreeView.get_column to get these objects.

If you only need notifications when the treeview changes its size, you can use its "size-allocate" signal instead.