C# (CSharp) UnmanagedMethods.GetAncestor示例

示例#1

        public override void Show()
        {
            UnmanagedMethods.ShowWindow(Handle.Handle, UnmanagedMethods.ShowWindowCommand.ShowNoActivate);

            // We need to steal focus if it's held by a child window of our toplevel window
            var parent = _parent;

            while (parent != null)
            {
                if (parent is PopupImpl pi)
                {
                    parent = pi._parent;
                }
                else
                {
                    break;
                }
            }

            if (parent == null)
            {
                return;
            }

            var focusOwner = UnmanagedMethods.GetFocus();

            if (focusOwner != IntPtr.Zero &&
                UnmanagedMethods.GetAncestor(focusOwner, UnmanagedMethods.GetAncestorFlags.GA_ROOT)
                == parent.Handle.Handle)
            {
                UnmanagedMethods.SetFocus(parent.Handle.Handle);
            }
        }