c# - 弹出窗口始终保持在顶部

Question

我有一个 WPF 应用程序，它有一个主窗口，我正在其上打开一个弹出窗口。我面临的问题是弹出窗口始终位于顶部。如果我打开其他应用程序(任何 Windows 应用程序)，主窗口会进入后台，但弹出窗口仍保留在顶部。但是，如果我最小化 Mainwindow，弹出窗口也会最小化。

请帮助解决这个问题。

更新:

我正在打开弹出窗口，如下所示

 myPopup.IsOpen = true;

Answer 1

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using System.Windows.Interop;

/// <summary>
/// Popup with code to not be the topmost control
/// </summary>
public class NonTopmostPopup : Popup
{
    /// <summary>
    /// Is Topmost dependency property
    /// </summary>
    public static readonly DependencyProperty IsTopmostProperty = DependencyProperty.Register("IsTopmost", typeof(bool), typeof(NonTopmostPopup), new FrameworkPropertyMetadata(false, OnIsTopmostChanged));

    private bool? _appliedTopMost;
    private bool _alreadyLoaded;
    private Window _parentWindow;

    /// <summary>
    /// Get/Set IsTopmost
    /// </summary>
    public bool IsTopmost
    {
        get { return (bool)GetValue(IsTopmostProperty); }
        set { SetValue(IsTopmostProperty, value); }
    }

    /// <summary>
    /// ctor
    /// </summary>
    public NonTopmostPopup()
    {
        Loaded += OnPopupLoaded;
        Unloaded += OnPopupUnloaded;
    }


    void OnPopupLoaded(object sender, RoutedEventArgs e)
    {
        if (_alreadyLoaded) 
            return;

        _alreadyLoaded = true;

        if (Child != null)
        {
            Child.AddHandler(PreviewMouseLeftButtonDownEvent, new MouseButtonEventHandler(OnChildPreviewMouseLeftButtonDown), true);
        }

        _parentWindow = Window.GetWindow(this);

        if (_parentWindow == null) 
            return;

        _parentWindow.Activated += OnParentWindowActivated;
        _parentWindow.Deactivated += OnParentWindowDeactivated;
    }

    private void OnPopupUnloaded(object sender, RoutedEventArgs e)
    {
        if (_parentWindow == null)
            return;
        _parentWindow.Activated -= OnParentWindowActivated;
        _parentWindow.Deactivated -= OnParentWindowDeactivated;
    }

    void OnParentWindowActivated(object sender, EventArgs e)
    {
        Debug.WriteLine("Parent Window Activated");
        SetTopmostState(true);
    }

    void OnParentWindowDeactivated(object sender, EventArgs e)
    {
        Debug.WriteLine("Parent Window Deactivated");

        if (IsTopmost == false)
        {
            SetTopmostState(IsTopmost);
        }
    }

    void OnChildPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        Debug.WriteLine("Child Mouse Left Button Down");

        SetTopmostState(true);

        if (!_parentWindow.IsActive && IsTopmost == false)
        {
            _parentWindow.Activate();
            Debug.WriteLine("Activating Parent from child Left Button Down");
        }
    }

    private static void OnIsTopmostChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
    {
        var thisobj = (NonTopmostPopup)obj;

        thisobj.SetTopmostState(thisobj.IsTopmost);
    }

    protected override void OnOpened(EventArgs e)
    {
        SetTopmostState(IsTopmost);
        base.OnOpened(e);
    }

    private void SetTopmostState(bool isTop)
    {
        // Don’t apply state if it’s the same as incoming state
        if (_appliedTopMost.HasValue && _appliedTopMost == isTop)
        {
            return;
        }

        if (Child == null) 
            return;

        var hwndSource = (PresentationSource.FromVisual(Child)) as HwndSource;

        if (hwndSource == null) 
            return;
        var hwnd = hwndSource.Handle;

        RECT rect;

        if (!GetWindowRect(hwnd, out rect)) 
            return;

        Debug.WriteLine("setting z-order " + isTop);

        if (isTop)
        {
            SetWindowPos(hwnd, HWND_TOPMOST, rect.Left, rect.Top, (int)Width, (int)Height, TOPMOST_FLAGS);
        }
        else
        {
            // Z-Order would only get refreshed/reflected if clicking the
            // the titlebar (as opposed to other parts of the external
            // window) unless I first set the popup to HWND_BOTTOM
            // then HWND_TOP before HWND_NOTOPMOST
            SetWindowPos(hwnd, HWND_BOTTOM, rect.Left, rect.Top, (int)Width, (int)Height, TOPMOST_FLAGS);
            SetWindowPos(hwnd, HWND_TOP, rect.Left, rect.Top, (int)Width, (int)Height, TOPMOST_FLAGS);
            SetWindowPos(hwnd, HWND_NOTOPMOST, rect.Left, rect.Top, (int)Width, (int)Height, TOPMOST_FLAGS);
        }

        _appliedTopMost = isTop;
    }

    #region P/Invoke imports & definitions
    #pragma warning disable 1591 //Xml-doc
    #pragma warning disable 169 //Never used-warning
    // ReSharper disable InconsistentNaming
    // Imports etc. with their naming rules

    [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.dll")]
    private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X,
    int Y, int cx, int cy, uint uFlags);

    static readonly IntPtr HWND_TOPMOST = new IntPtr(-1);
    static readonly IntPtr HWND_NOTOPMOST = new IntPtr(-2);
    static readonly IntPtr HWND_TOP = new IntPtr(0);
    static readonly IntPtr HWND_BOTTOM = new IntPtr(1);

    private const UInt32 SWP_NOSIZE = 0x0001;
    const UInt32 SWP_NOMOVE = 0x0002;
    const UInt32 SWP_NOZORDER = 0x0004;
    const UInt32 SWP_NOREDRAW = 0x0008;
    const UInt32 SWP_NOACTIVATE = 0x0010;

    const UInt32 SWP_FRAMECHANGED = 0x0020; /* The frame changed: send WM_NCCALCSIZE */
    const UInt32 SWP_SHOWWINDOW = 0x0040;
    const UInt32 SWP_HIDEWINDOW = 0x0080;
    const UInt32 SWP_NOCOPYBITS = 0x0100;
    const UInt32 SWP_NOOWNERZORDER = 0x0200; /* Don’t do owner Z ordering */
    const UInt32 SWP_NOSENDCHANGING = 0x0400; /* Don’t send WM_WINDOWPOSCHANGING */

    const UInt32 TOPMOST_FLAGS = 
        SWP_NOACTIVATE | SWP_NOOWNERZORDER | SWP_NOSIZE | SWP_NOMOVE | SWP_NOREDRAW | SWP_NOSENDCHANGING;

    // ReSharper restore InconsistentNaming
    #pragma warning restore 1591
    #pragma warning restore 169
    #endregion
}