wpf键盘焦点：菜单打开后失去焦点？(wpf keyboard focus: losing focus after menu opens?)

 这似乎很容易，但它绝对没有按预期工作。 在WPF 4.0中，我正在尝试使用菜单栏创建一个窗口，该菜单栏接受键盘快捷键...只是一个简单的窗口，顶部的菜单栏和其他一些东西（在AvalonDock内部，这可能是问题的一部分） ）。 
 
 有一个问题：菜单栏和内容在另一个用户控件中（让我们称之为SadPanda ，因为它让我成为一个悲伤的熊猫），这是窗口的直接内容。 逻辑层次结构看起来像这样（不是实际的XAML）： 
 
<Window>
  <UserControl x:Name="SadPanda" Focusable="True" FocusManager.IsFocusScope="True">
    <Grid>
      <MenuBar/>
      <AvalonDock:DockingManager>
        <PandaFood>
      </AvalonDock:DockingManager>
    </Grid>
  </UserControl>
</Window>
 
 窗口的内容需要访问窗口的Handle，所以它在窗口加载后设置如下： 
 
window.Loaded += delegate { window.Content = new SadPanda(); };
 
 菜单栏和快捷方式具有绑定到SadPanda的路由命令 ，当键盘焦点丢失时，输入手势不再起作用，因此悲伤的熊猫。 我补充说： 
 
LostKeyboardFocus += (sender, e) => Debug.WriteLine("Lost focus to " + e.NewFocus);
GotKeyboardFocus += (sender, e) => Debug.WriteLine("Got focus from " + e.OldFocus);
 
 ......似乎重点是回到Window，而不是SadPanda本身。 如果我在窗口上设置Focusable =“False”，则焦点变为null; 甚至从未考虑过控制。 我尝试过（在评论中由alpha-mouse建议）： 
 
window.GotKeyboardFocus += delegate { Keyboard.Focus(sadPanda); };
 
 即使这样也行不通 - 它可以防止菜单打开（它们会闪烁一秒钟，然后消失）或者文本框变得焦点......不知道为什么; 它似乎是完美的解决方案。 
 
 基本上，我希望用户控件具有顶级键盘焦点，而不是窗口。 实现这一目标的最简单方法是什么？ 

This seems really easy, but it's definitely not working as expected. In WPF 4.0, I'm trying to create a window with a menu bar that accepts keyboard shortcuts... Just a simple window, a menu bar at the top, and some other stuff (inside AvalonDock, which may be part of the issue).
 
There's one catch: the menu bar & content are in another user control (let's call it SadPanda, because it's making me a sad panda) that is the direct content of the window. The logical hierarchy looks something like this (not actual XAML):
 
<Window>
  <UserControl x:Name="SadPanda" Focusable="True" FocusManager.IsFocusScope="True">
    <Grid>
      <MenuBar/>
      <AvalonDock:DockingManager>
        <PandaFood>
      </AvalonDock:DockingManager>
    </Grid>
  </UserControl>
</Window>
 
The content of the window needs access to the window's Handle, so it's set after the window loads like this:
 
window.Loaded += delegate { window.Content = new SadPanda(); };
 
The menu bar & shortcuts have routed commands that are bound to SadPanda, and when the keyboard focus is lost, the input gestures no longer work, hence the sad panda. I added this:
 
LostKeyboardFocus += (sender, e) => Debug.WriteLine("Lost focus to " + e.NewFocus);
GotKeyboardFocus += (sender, e) => Debug.WriteLine("Got focus from " + e.OldFocus);
 
... and it seems that the focus is returning to the Window, rather than to SadPanda itself. If I set Focusable="False" on the window, then the focus goes to null; the control is never even considered. I tried (suggested by alpha-mouse in comments):
 
window.GotKeyboardFocus += delegate { Keyboard.Focus(sadPanda); };
 
Even this doesn't work -- it prevents menus from opening (they flash open for a second, then disappear) or text boxes from ever getting focus... Not sure why; it seems like the perfect solution.
 
Basically, I want the user control to have top-level keyboard focus, not the window. What's the easiest way to achieve this?

原文：https://stackoverflow.com/questions/4447929