internal bool MessageBoxWithFocusRestore(string message, MessageBoxButton buttons, MessageBoxImage image)
{
bool result = false;
IntPtr focus = UnsafeNativeMethods.GetFocus();
try
{
result = (MessageBox.Show(message, this.DialogCaption, buttons, image, MessageBoxResult.OK, MessageBoxOptions.None) == MessageBoxResult.Yes);
}
finally
{
UnsafeNativeMethods.SetFocus(new HandleRef(this, focus));
}
return(result);
}
/// <summary>
/// 获取一个值，该值指示控件或它的一个子控件当前是否有输入焦点。
/// </summary>
/// <param name="hWnd">控件句柄。</param>
/// <returns>如果控件或它的一个子控件当前已经有输入焦点，则为 true；否则为 false。</returns>
public static bool GetContainsFocus(IntPtr hWnd)
{
if (!GetIsHandleCreated(hWnd))
{
return(false);
}
IntPtr focus = UnsafeNativeMethods.GetFocus();
if (focus == IntPtr.Zero)
{
return(false);
}
return((focus == hWnd) || UnsafeNativeMethods.IsChild(hWnd, focus));
}
/// <summary>
/// 获取一个值，该值指示控件是否有输入焦点。
/// </summary>
/// <param name="hWnd">控件句柄。</param>
/// <returns>如果控件有焦点，则为 true；否则为 false。</returns>
public static bool GetFocused(IntPtr hWnd)
{
return(GetIsHandleCreated(hWnd) && (UnsafeNativeMethods.GetFocus() == hWnd));
}