此解决方案是否适合您?我在UserControl中创建了一个名为LostFocusIgnoreChildren
的新事件,该事件仅在新的焦点元素不是此UserControl的子元素时触发。
UserControl1.cs
public partial class UserControl1 : UserControl
{
public UserControl1()
{
InitializeComponent();
}
public event RoutedEventHandler LostFocusIgnoreChildren;
private void UserControl_LostFocus(object sender, RoutedEventArgs e)
{
var focused_element = FocusManager.GetFocusedElement(Application.Current.Windows.OfType<Window>().SingleOrDefault(x => x.IsActive));
var parent = (focused_element as FrameworkElement).TryFindParent<UserControl1>();
if (parent == null && LostFocusIgnoreChildren != null)
LostFocusIgnoreChildren(this, e);
}
}
VisualTreeHelper扩展
public static class VisualTreeHelperExt
{
public static T TryFindParent<T>(this DependencyObject child)
where T : DependencyObject
{
DependencyObject parentObject = GetParentObject(child);
if (parentObject == null) return null;
T parent = parentObject as T;
if (parent != null)
{
return parent;
}
else
{
return TryFindParent<T>(parentObject);
}
}
public static DependencyObject GetParentObject(this DependencyObject child)
{
if (child == null) return null;
ContentElement contentElement = child as ContentElement;
if (contentElement != null)
{
DependencyObject parent = ContentOperations.GetParent(contentElement);
if (parent != null) return parent;
FrameworkContentElement fce = contentElement as FrameworkContentElement;
return fce != null ? fce.Parent : null;
}
FrameworkElement frameworkElement = child as FrameworkElement;
if (frameworkElement != null)
{
DependencyObject parent = frameworkElement.Parent;
if (parent != null) return parent;
}
return VisualTreeHelper.GetParent(child);
}
}
能否请您分享一些代码?这样可以更轻松地纠正您正在制作的任何错误或解决任何意外问题。也许你应该看看[Control.Leave Event](https://msdn.microsoft.com/en-us/library/system.windows.forms.control.leave(v = vs.110).aspx) 。 – Oceans
Control.Leave是Windows.Forms。 – bebo
“如果你确实需要创建一个新的WPF控件,最简单的方法是创建一个从UserControl派生的类(...)如果你想通过向其添加现有元素来构建控件,从UserControl派生是一个合适的模型,类似于你如何构建一个应用程序(如果你想在你的控件中使用模板,可以从Control派生而来。)_“ - 源:[MSDN UserControl Class](https://msdn.microsoft.com/en-us /library/system.windows.controls.usercontrol(v=vs.110).aspx) – Oceans