如何将焦点从tabitem标题转移到WPF中的内容？

Question

如何通过按下向下箭头将焦点从tabitem标题移动到此tabitem的内容？ 我尝试使用KeyboardNavigation但是当我按下或向上键时，Keyboardfocus仍然没有移动。

提前致谢。

Answer 1

我创建了一个附加属性来解决类似的问题。当您按ContentControl（TabItem）上的某个键时，它会关注内容。 XAML看起来像这样

<TabControl Focusable="False">
        <TabItem Header="Main" local:Focus.ContentOn="Down">
            <Stackpanel>
               <TextBox />
            </Stackpanel>
        </TabItem>

附属物：

public static class Focus
{
    public static Key GetContentOn(DependencyObject obj)
    {
        return (Key)obj.GetValue(ContentOnProperty);
    }

    public static void SetContentOn(DependencyObject obj, Key value)
    {
        obj.SetValue(ContentOnProperty, value);
    }

    // Using a DependencyProperty as the backing store for ContentOn.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty ContentOnProperty =
        DependencyProperty.RegisterAttached("ContentOn", typeof(Key), typeof(Navigate),
        new FrameworkPropertyMetadata(Key.None, OnContentOnChanged));

    private static void OnContentOnChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
    {
        var control = o as ContentControl;
        if (control != null)
            control.KeyDown += FocusContent;
    }

    private static void FocusContent(object sender, KeyEventArgs e)
    {
        if (Keyboard.FocusedElement == sender)
        {
            var control = sender as ContentControl;
            if (control != null && control.HasContent && GetContentOn(control) == e.Key)
            {
                ((FrameworkElement)control.Content).MoveFocus(new TraversalRequest(FocusNavigationDirection.First));
                e.Handled = true;
            }
        }
    }
}