WPF Popup 置顶问题

时间：2014-02-09 17:47:59 阅读：471 评论：0 收藏：0 [点我收藏+]

问题：

使用wpf的popup，当在popup中弹出MessageBox或者打开对话框的时候，popup总是置顶，并遮住MessageBox或对话框.

解决：

写如下用户控件

需导入的空间: using System.Windows.Controls.Primitives;

using System.Runtime.InteropServices;

using System.Windows.Interop;

[c-sharp] view plain copy

public class CCPopup : Popup
{
public static DependencyProperty TopmostProperty = Window.TopmostProperty.AddOwner(typeof(CCPopup), new FrameworkPropertyMetadata(false, OnTopmostChanged));
public bool Topmost
{
get { return (bool)GetValue(TopmostProperty); }
set { SetValue(TopmostProperty, value); }
}
private static void OnTopmostChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
(obj as CCPopup).UpdateWindow();
}
protected override void OnOpened(EventArgs e)
{
UpdateWindow();
}
private void UpdateWindow()
{
var hwnd = ((HwndSource)PresentationSource.FromVisual(this.Child)).Handle;
RECT rect;
if (GetWindowRect(hwnd, out rect))
{
SetWindowPos(hwnd, Topmost ? -1 : -2, rect.Left, rect.Top, (int)this.Width, (int)this.Height, 0);
}
}
#region P/Invoke imports & definitions
[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
public int Left;
public int Top;
public int Right;
public int Bottom;
}
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);
[DllImport("user32", EntryPoint = "SetWindowPos")]
private static extern int SetWindowPos(IntPtr hWnd, int hwndInsertAfter, int x, int y, int cx, int cy, int wFlags);
#endregion
}

原文：http://www.cnblogs.com/lonelyxmas/p/3541665.html

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