解决WPF下popup不随着window一起移动的问题_小戴BOTAOY演示博客 (yii666.com)
/// <summary>
/// Popup帮助类，解决Popup设置StayOpen="True"时，移动窗体或者改变窗体大小时，Popup不随窗体移动的问题
/// </summary>
public class PopopHelper
{
public static DependencyObject GetPopupPlacementTarget(DependencyObject obj)
{
return (DependencyObject)obj.GetValue(PopupPlacementTargetProperty);
}
public static void SetPopupPlacementTarget(DependencyObject obj, DependencyObject value)
{
obj.SetValue(PopupPlacementTargetProperty, value);
}
public static readonly DependencyProperty PopupPlacementTargetProperty =
DependencyProperty.RegisterAttached("PopupPlacementTarget", typeof(DependencyObject), typeof(PopopHelper), new PropertyMetadata(null, OnPopupPlacementTargetChanged));
private static void OnPopupPlacementTargetChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (e.NewValue != null)
{
DependencyObject popupPopupPlacementTarget = e.NewValue as DependencyObject;
Popup pop = d as Popup;
Window w = Window.GetWindow(popupPopupPlacementTarget);
if (null != w)
{
//让Popup随着窗体的移动而移动
w.LocationChanged += delegate
{
var mi = typeof(Popup).GetMethod("UpdatePosition", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
mi.Invoke(pop, null);
};
//让Popup随着窗体的Size改变而移动位置
w.SizeChanged += delegate
{
var mi = typeof(Popup).GetMethod("UpdatePosition", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
mi.Invoke(pop, null);
};
}
}
}
}
View Code
使用方法：
<Popup x:Name="popusBottom2" IsOpen="True" local:PopopHelper.PopupPlacementTarget="{Binding ElementName=PCheckBox2}" AllowsTransparency="True" PopupAnimation="Fade" HorizontalOffset="5" VerticalOffset="-420">
<Image x:Name="panel_preview" Height="100" Width="100"></Image>
</Popup>
View Code
标签：Popup,移动,System,window,popup,窗体,WPF,null,DependencyObject From： https://www.cnblogs.com/MarcLiu/p/18052151