Is there any way to stop a WPF Popup from repositioning itself when it goes off-screen?

Question

Is there any way to stop a WPF Popup from repositioning itself when it goes off-screen?

I found this old question, but it didn\'t get a proper answer to it. Is there

Answer 1

there is no way on wpf framework to put Popup out of screen , but you can force popup position by calling "SetWindowPos" via p/invoke:

#region P/Invoke imports & definitions

        private const int HWND_TOPMOST = -1;
        private const int HWND_NOTOPMOST = -2;
        private const int HWND_BOTTOM = 1;
        private const int SWP_NOMOVE = 0x0002;
        private const int SWP_NOSIZE = 0x0001;
        private const int SWP_NOACTIVATE = 0x0010;
        private const int GW_HWNDPREV = 3;
        private const int GW_HWNDLAST = 1;


  [DllImport("user32.dll", EntryPoint = "SetWindowPos")]
        private static extern int SetWindowPos(IntPtr hWnd, int hwndInsertAfter, int x, int y, int cx, int cy, int wFlags); 

 #endregion

 private void updateposition(Item item)
        {
            if (item.IsOpen)
            {
                IntPtr hwnd = ((HwndSource)PresentationSource.FromVisual(item.popup.Child)).Handle;
                SetWindowPos(hwnd, 0, (int)item.WorkPoint.X, (int)item.WorkPoint.Y, (int)item.popup.Width, (int)item.popup.Height, SWP_NOSIZE | SWP_NOACTIVATE);

            }


        }