解决WPF下popup不随着window一起移动的问题

最新推荐文章于 2025-10-23 10:27:30 发布

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本文介绍了一种解决WPF中Popup控件在设置StayOpen为True时，不随窗体移动或改变大小的问题的方法。通过定义一个Popup帮助类，并使用依赖属性，可以使Popup在窗体移动或调整大小时自动更新位置。

转自：https://www.cnblogs.com/zhidanfeng/articles/6882869.html

当我们设置Popup的StayOpen=”True”时，会发现移动窗体或者改变窗体的Size的时候，Popup并不会跟随着一起移动位置。为了解决这个问题，可以给Popup定义一个附加属性，代码如下所示：

/// <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);
                };
            }
        }
    }
}

使用方法：

<Popup x:Name="PART_Popup" AllowsTransparency="True" IsOpen="True" Placement="Bottom"
       PlacementTarget="{Binding ElementName=PART_ToggleButton}"
       HorizontalOffset="-5"
       ZUI:PopopHelper.PopupPlacementTarget="{Binding ElementName=PART_ToggleButton}"
       StaysOpen="True">
    <Border x:Name="ItemsPresenter" Background="Transparent">
        <ItemsPresenter />
    </Border>
</Popup>