将焦点设置回其父级？ [英] Set focus back to its parent?

问题描述

从：如何以编程方式从移除焦点文本框，我知道如何使用下面的代码来设置文本框的焦点回到它的父：

From post WPF: How to programmatically remove focus from a TextBox, I know how to set a TextBox's focus back to its parent using the following code:

// Move to a parent that can take focus
FrameworkElement parent = (FrameworkElement)textBox.Parent;
while (parent != null && parent is IInputElement 
                      && !((IInputElement)parent).Focusable)
{
    parent = (FrameworkElement)parent.Parent;
}

DependencyObject scope = FocusManager.GetFocusScope(textBox);
FocusManager.SetFocusedElement(scope, parent as IInputElement);

有什么办法来概括这段代码（如模板函数），使其也为其他项目工作像组合框，画布，图片等。

Is there any way to generalize this code (like template functions) to make it also work for other items like ComboBox, Canvas, Image etc.

推荐答案

这应该是比较简单的：

FrameworkElement ctrl = control; //or whatever you're passing in, since all controls are FrameworkElements.

// Move to a parent that can take focus
FrameworkElement parent = (FrameworkElement)ctrl.Parent;
while (parent != null && parent is IInputElement 
                  && !((IInputElement)parent).Focusable)
{
    parent = (FrameworkElement)parent.Parent;
}

DependencyObject scope = FocusManager.GetFocusScope(ctrl); //can pass in ctrl here because FrameworkElement inherits from DependencyObject
FocusManager.SetFocusedElement(scope, parent as IInputElement);

这工作，因为所有的控件自FrameworkElement其自DependencyObject继承继承。所以，你可以设置 CTRL 你想要的任何类型的控件：组合框，文本框，按钮，画布等

This works because all controls inherit from FrameworkElement which inherits from DependencyObject. So you can set ctrl to any type of control you want: ComboBox, TextBox, Button, Canvas, etc.

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