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在wpf中，如何获取选项卡顺序中的下一个控件

发布于 2024-11-03 01:16:09 字数 174 浏览 2 评论 0原文

我知道如何将焦点设置到 Tab 键顺序中的下一个控件，但我实际上并不想更改焦点...我只想获取 Tab 键顺序中的下一个控件（也许还可以获取上一个、第一个和最后一个控件。）那么...howyadodat？

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风和你 2024-11-10 01:16:09

PredictFocus(FocusNavigationDirection.Next) 不起作用，正如 @Cameron 所说。我基于 @Randolpho 的帖子的包装器代码现在运行良好。

我尝试了几种模式，最后得出结论，我必须确保 container 实际上是 e 的父级之一，以避免意外结果。

/// <summary>
/// Get next tab order element.
/// </summary>
/// <param name="e">The element to get next tab order</param>
/// <param name="container">The container element owning 'e'. Make sure this is a container of 'e'.</param>
/// <param name="goDownOnly">True if search only itself and inside of 'container'; otherwise false.
/// If true and next tab order element is outside of 'container', result in null.</param>
/// <returns>Next tab order element or null if not found</returns>
public DependencyObject GetNextTab(DependencyObject e, DependencyObject container, bool goDownOnly)
{
    var navigation = typeof(FrameworkElement)
        .GetProperty("KeyboardNavigation", BindingFlags.NonPublic | BindingFlags.Static)
        .GetValue(null);

    var method = navigation
        .GetType()
        .GetMethod("GetNextTab", BindingFlags.NonPublic | BindingFlags.Instance);

    return method.Invoke(navigation, new object[] { e, container, goDownOnly }) as DependencyObject;
}

前任。）

var nextElement = GetNextTab(textbox1, window, false);

PredictFocus(FocusNavigationDirection.Next) doesn't work as @Cameron said. My wrapper code based on @Randolpho 's post is now working well.

I tried several patterns and finally concluded I have to make sure container is actually one of the parents of e to avoid unexpected results.

/// <summary>
/// Get next tab order element.
/// </summary>
/// <param name="e">The element to get next tab order</param>
/// <param name="container">The container element owning 'e'. Make sure this is a container of 'e'.</param>
/// <param name="goDownOnly">True if search only itself and inside of 'container'; otherwise false.
/// If true and next tab order element is outside of 'container', result in null.</param>
/// <returns>Next tab order element or null if not found</returns>
public DependencyObject GetNextTab(DependencyObject e, DependencyObject container, bool goDownOnly)
{
    var navigation = typeof(FrameworkElement)
        .GetProperty("KeyboardNavigation", BindingFlags.NonPublic | BindingFlags.Static)
        .GetValue(null);

    var method = navigation
        .GetType()
        .GetMethod("GetNextTab", BindingFlags.NonPublic | BindingFlags.Instance);

    return method.Invoke(navigation, new object[] { e, container, goDownOnly }) as DependencyObject;
}

Ex.)

var nextElement = GetNextTab(textbox1, window, false);

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单身情人 2024-11-10 01:16:09

我认为不可能按 Tab 键顺序拥有下一个控件，但您可以循环子集合并使用 KeyboardNavigation.GetIsTabStop(..) KeyboardNavigation.GetTabIndex()< /code> 为他们创建一个助手。

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疯到世界奔溃 2024-11-10 01:16:09

PredictFocus 为应该在 .NET 4 中获得 Tab 支持，但是当前MSDN 暗示还没有。然而，这可能是一个文件疏忽；我没有尝试过，但你可以尝试一下。

如果这不起作用，KeyboardNavigation 上有一个私有方法可能会对您有所帮助；您必须使用反射来调用它，并且需要适当的代码访问权限才能执行此操作，但它可能会起作用。 .NET Reflector 显示签名如下：

private DependencyObject GetNextTab(DependencyObject e, DependencyObject container, bool goDownOnly)

其中 e 是您要获取其下一个选项卡的元素，container 是其父容器。我不是 100% 确定 goDownOnly 会做什么，但我猜测它表明您不想离开父容器。如果该元素没有下一个选项卡，该方法将返回 null。

请记住，这是一个私有方法；下一个版本很容易发生变化。

编辑：您需要一个KeyboardNavigation实例！完全忘记了这一点。 FrameworkElement.KeyboardNavigation 中有一个静态的，但它也是内部的，因此需要通过反射来获取它。

PredictFocus was supposed to get Tab support in .NET 4, but the current MSDN implies it hasn't. That may be a documentation oversight, however; I haven't tried it, but you could give it a shot.

If that doesn't work, there's a private method on KeyboardNavigation that may do you some good; you'll have to use reflection to call it, and you'll need the proper code access permissions to do it, but it might work. .NET Reflector reveals the signature as follows:

private DependencyObject GetNextTab(DependencyObject e, DependencyObject container, bool goDownOnly)

Where e is the element for which you want to get the next tab, and container is its parent container. I'm not 100% sure what goDownOnly does, but I guess that it indicates that you don't want to leave the parent container. The method will return null if there isn't a next tab for that element.

Keep in mind, this is a private method; highly susceptible to change come the next version.

Edit: you'll need an instance of KeyboardNavigation! Totally forgot about that. There's a static one at FrameworkElement.KeyboardNavigation, but it's also internal, so reflection to get at it.

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