如何按 z-index 对 Windows 进行排序? [英] How to sort Windows by z-index?

问题描述

如果我在 Application.Current.Windows 中枚举窗口，我怎么知道对于任意两个窗口，哪个更接近"(即具有更大的 z-index)?

或者，换句话说，我如何按 z-index 对这些窗口进行排序?

解决方案

您无法从 WPF 获取 Window 的 Z 顺序信息，因此您必须求助于 Win32.

这样的事情应该可以解决问题:

var topToBottom = SortWindowsTopToBottom(Application.Current.Windows.OfType());...公共 IEnumerableSortWindowsTopToBottom(IEnumerable未排序){var byHandle = unsorted.ToDictionary(win =>((HwndSource)PresentationSource.FromVisual(win)).Handle);for(IntPtr hWnd = GetTopWindow(IntPtr.Zero); hWnd!=IntPtr.Zero; hWnd = GetWindow(hWnd, GW_HWNDNEXT)if(byHandle.ContainsKey(hWnd))yield return byHandle[hWnd];}const uint GW_HWNDNEXT = 2;[DllImport("User32")] static extern IntPtr GetTopWindow(IntPtr hWnd);[DllImport("User32")] static extern IntPtr GetWindow(IntPtr hWnd, uint wCmd);

它的工作方式是:

1. 它使用字典通过窗口句柄索引给定的窗口，使用的事实是在 WPF 的 Windows 实现中，Window 的 PresentationSource 始终是 HwndSource.
2. 它使用 Win32 从上到下扫描所有无父窗口以找到正确的顺序.

If I'm enumerating windows in Application.Current.Windows, how can I tell, for any two windows, which one is "closer" (i.e. has greater z-index)?

Or, to say the same in other words, how can I sort those windows by z-index?

解决方案

You cannot get a Window's Z Order information from WPF so you must resort to Win32.

Something like this ought to do the trick:

var topToBottom = SortWindowsTopToBottom(Application.Current.Windows.OfType<Window>());
...

public IEnumerable<Window> SortWindowsTopToBottom(IEnumerable<Window> unsorted)
{
  var byHandle = unsorted.ToDictionary(win =>
    ((HwndSource)PresentationSource.FromVisual(win)).Handle);

  for(IntPtr hWnd = GetTopWindow(IntPtr.Zero); hWnd!=IntPtr.Zero; hWnd = GetWindow(hWnd, GW_HWNDNEXT)
    if(byHandle.ContainsKey(hWnd))
      yield return byHandle[hWnd];
}

const uint GW_HWNDNEXT = 2;
[DllImport("User32")] static extern IntPtr GetTopWindow(IntPtr hWnd);
[DllImport("User32")] static extern IntPtr GetWindow(IntPtr hWnd, uint wCmd);

The way this works is:

1. It uses a dictionary to index the given windows by window handle, using the fact that in the Windows implementation of WPF, Window's PresentationSource is always HwndSource.
2. It uses Win32 to scan all unparented windows top to bottom to find the proper order.

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