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
我通过执行以下操作来阻止我的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 focus
yourWindow.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;
}
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);
