2018-5-28-WPF-popup置顶

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title	author	date	CreateTime	categories
WPF popup置顶	lindexi	2018-05-28 09:58:53 +0800	2018-2-13 17:23:3 +0800	WPF

在程序写一个popup发现他会在置顶，在网上找了两大神代码，就使用他的代码

http://www.cnblogs.com/Leaco/p/3164394.html

http://blog.csdn.net/baijinwen/article/details/6159043

只需要把下面的类放到自己的软件，然后把使用 popup 替换为 CCPopup 就不会让popup置顶

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
}