在WPF(Windows Presentation Foundation)中,当窗口不再位于顶部时,可以使用以下事件来处理:
要使用这些事件,可以在XAML中添加事件处理程序,或者在代码后面添加事件处理程序。例如,在XAML中,可以添加如下代码:
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow"
Deactivated="Window_Deactivated"
LostFocus="Window_LostFocus"
PreviewLostKeyboardFocus="Window_PreviewLostKeyboardFocus"
PreviewMouseDown="Window_PreviewMouseDown"
PreviewMouseUp="Window_PreviewMouseUp">
在代码后面,可以添加如下代码:
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
this.Deactivated += Window_Deactivated;
this.LostFocus += Window_LostFocus;
this.PreviewLostKeyboardFocus += Window_PreviewLostKeyboardFocus;
this.PreviewMouseDown += Window_PreviewMouseDown;
this.PreviewMouseUp += Window_PreviewMouseUp;
}
private void Window_Deactivated(object sender, EventArgs e)
{
// 处理窗口失去激活状态的事件
}
private void Window_LostFocus(object sender, RoutedEventArgs e)
{
// 处理窗口或其子元素失去焦点的事件
}
private void Window_PreviewLostKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
{
// 处理键盘焦点即将从窗口或其子元素移动到其他元素的事件
}
private void Window_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
// 处理鼠标按钮在窗口或其子元素上按下的事件
}
private void Window_PreviewMouseUp(object sender, MouseButtonEventArgs e)
{
// 处理鼠标按钮在窗口或其子元素上释放的事件
}
}
通过使用这些事件,可以在窗口不再位于顶部时执行特定的操作,例如保存用户输入或更新UI。
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