wpf – 如何防止焦点窃取,但在使用Alt Tab返回我的应用程序时仍然可以获得焦点？

概述遵循MS准则,我的 WPF应用程序的App构造函数包含以下代码以实现正确的焦点行为： HwndSource.DefaultAcquireHwndFocusInMenuMode = false;Keyboard.DefaultRestoreFocusMode = RestoreFocusMode.None; 如this article中所述,这些设置可防止焦点窃取. 但是,将DefaultRest 遵循MS准则,我的 WPF应用程序的App构造函数包含以下代码以实现正确的焦点行为：

HwndSource.DefaultAcquireHwndFocusInMenuMode = false;Keyboard.DefaultRestoreFocusMode = RestoreFocusMode.None;

如this article中所述,这些设置可防止焦点窃取.

但是,将DefaultRestoreFocusMode设置为None会产生不良副作用.当使用Alt Tab离开WPF应用程序然后返回它时,WPF应用程序不会获得焦点.但是,如果我没有将DefaultRestoreFocusMode设置为none,它会按预期获得焦点.有没有办法防止焦点窃取,但通过Alt Tab返回到WPF应用程序时仍然设置焦点？

-Craig

解决方法 我通过执行以下 *** 作来阻止我的wpf窗口获得焦点,我仍然可以使用ALT-TAB或单击它的任务栏项来激活它.

在这里,您可以更改窗口上的窗口样式,使其无法激活.

var yourWindow = new YourWindowType();//set the windowstyle to noactivate so the window doesn't get focusyourWindow.sourceInitialized += (s,e) =>{  var interopHelper = new WindowInteropHelper(yourWindow);  int exStyle = User32.getwindowlong(interopHelper.Handle,(int)WindowLongFlags.GWL_EXSTYLE);  User32.SetwindowLong(interopHelper.Handle,(int)WindowLongFlags.GWL_EXSTYLE,exStyle | (int)windowstylesEx.WS_EX_NOACTIVATE);  //If you have trouble tyPing into your form's textBoxes then do this  ElementHost.EnableModelessKeyboardInterop(yourWindow);};

这是我作为额外的预防措施添加的东西,而且如果它是无边界的,它可以让你拖动你的窗口：

private IntPtr WndProc(IntPtr hwnd,int msg,IntPtr wParam,IntPtr lParam,ref bool handled){  switch (msg)  {    //don't activate the window when you click on it.    case WindowMessage.WM_MOUSEACTIVATE:        handled = true;      return (IntPtr)MouseActivate.MA_NOACTIVATE;    //For borderless windows: occurs while dragging. it reports new position before it has been finalized.    //otherwise you wont see the window moving while you're dragging it     case WindowMessage.WM_MOVING:       RECT rect = (RECT)Marshal.PtrToStructure(lParam,typeof(RECT));      User32.SetwindowPos(new WindowInteropHelper(this).Handle,Hwnd.HWND_topMOST,rect.left,rect.top,rect.WIDth,rect.Height,SetwindowPosFlags.SWP_NOACTIVATE | SetwindowPosFlags.SWP_NOSIZE);      break;  }  return IntPtr.Zero;}

这些添加一个钩子,以便在WPF中实际调用WndProc：

private voID Window_Loaded(object sender,RoutedEventArgs e){  HwndSource source = HwndSource.FromHwnd(new WindowInteropHelper(this).Handle);  if (source == null) return;  source.AddHook(WndProc);}private voID Window_Closing(object sender,System.ComponentModel.CancelEventArgs e){  HwndSource source = HwndSource.FromHwnd(new WindowInteropHelper(this).Handle);  if (source == null) return;  source.RemoveHook(WndProc);}

只是一个FYI ..即使你没有得到关注,这仍然有效：

private voID WpfPillForm_MouseleftbuttonDown(object sender,MousebuttonEventArgs e)    {      this.DragMove();    }

这是Win32 API声明,因此您无需查找它们：

[StructLayout(LayoutKind.Sequential)]    public struct WINDOWPOS    {        public IntPtr hwnd;        public IntPtr hwndInsertAfter;        public int x;        public int y;        public int cx;        public int cy;        public int flags;    }[StructLayout(LayoutKind.Sequential)]struct RECT{    public int left,top,right,bottom;}  public static class MouseActivate  {    public const int MA_ACTIVATE = 1;    public const int MA_ACTIVATEANDEAT = 2;    public const int MA_NOACTIVATE = 3;    public const int MA_NOACTIVATEANDEAT = 4;  }  public enum WindowLongFlags : int  {    GWL_EXSTYLE = -20,GWLP_HINSTANCE = -6,GWLP_HWNDPARENT = -8,GWL_ID = -12,GWL_STYLE = -16,GWL_USERDATA = -21,GWL_WNDPROC = -4,DWLP_USER = 0x8,DWLP_MSGRESulT = 0x0,DWLP_DLGPROC = 0x4  }    public const int WM_MOVING = 0x0216;    public const uint WS_EX_NOACTIVATE = 0x08000000,[Dllimport("user32.dll")]    [return: MarshalAs(UnmanagedType.Bool)]    public static extern bool SetwindowPos(IntPtr hWnd,IntPtr hWndInsertAfter,int X,int Y,int cx,int cy,SetwindowPosFlags uFlags);    [Dllimport("user32.dll",CharSet = CharSet.auto,SetLastError = true)]    public static extern int SetwindowLong(IntPtr hWnd,int nIndex,int DWNewLong);    [Dllimport("user32.dll",SetLastError = true)]    public static extern int getwindowlong(IntPtr hwnd,int index);

总结

以上是内存溢出为你收集整理的wpf – 如何防止焦点窃取,但在使用Alt Tab返回我的应用程序时仍然可以获得焦点？全部内容，希望文章能够帮你解决wpf – 如何防止焦点窃取,但在使用Alt Tab返回我的应用程序时仍然可以获得焦点？所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。