我的WPF应用程序有一个主窗口,我正在打开一个弹出窗口。我面临的问题是弹出窗口总是保持在最顶层。如果我打开其他应用程序(任何Windows应用程序),主窗口将进入后台,但弹出窗口仍然位于顶部。但是,如果我最小化主窗口,则弹出窗口也会最小化。
请帮助克服这个问题。
更新
我打开下面的Popup
myPopup.IsOpen = true;
答案 0 :(得分:19)
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
}
答案 1 :(得分:12)
Popups
做 - 据我所知 - 不支持这样的行为,他们的预期用途是ComboxBox
- 据我所知,下拉菜单等。要实现类似的功能,您可以使用普通Window
并将其Owner
设置为它应该依赖的主窗口。这将导致弹出窗口保持在其所有者和顶部之上。与业主一起尽量减少。
e.g。
public class ChildWindow: Window
{
public ChildWindow(Window owner)
{
this.Owner = owner;
}
}
var popup = new ChildWindow(mainWindow);
popup.Show();
(Windows关闭后无法重新打开,因此当用户尝试关闭时,只需重用一个窗口Hide()
(处理Closing
事件并取消使用事件参数))
答案 2 :(得分:11)
H.B。是正确的 - WPF Popup控件不是最重要的。另一方面 - 请查看以下有关使用user32
实现目标的博文:
http://chriscavanagh.wordpress.com/2008/08/13/non-topmost-wpf-popup/
答案 3 :(得分:0)
检查Window.Topmost
属性,表明该窗口应始终位于顶部。
PopupWindow wnd = new PopupWindow();
wnd.ShowDialog();
答案 4 :(得分:0)
您是否使用WPF控件创建PopUp?此控件绘制弹出窗口的方式会导致您描述的行为。 考虑创建一个新窗口,显示您想要显示的内容。
答案 5 :(得分:0)
仅向父控件创建PopUp窗口模式,如Billy Holli和Brad Leach所示。这样它将保持打开弹出控件的应用程序/窗口的顶部,但不会再停留在其他窗口/应用程序之上。
答案 6 :(得分:0)
这解决了我的问题。
PopupForm pf = new PopupForm();
pf.Owner = this;
pf.Topmost = false;
pf.ShowDialog()