WPF disable window moving

Question

In wpf how can i prevent user from moving the windows by dragging the title bar?

Answer 1

Hi,

in a WinForms-Application, you can disable moving the window by overriding the WndProc-method.

protected override void WndProc(ref Message message)
{
   const int WM_SYSCOMMAND = 0x0112;
   const int SC_MOVE = 0xF010;

   switch(message.Msg)
   {
      case WM_SYSCOMMAND:
         int command = message.WParam.ToInt32() & 0xfff0;
         if (command == SC_MOVE)
         {
            return;
         }
      break;
   }

   base.WndProc(ref message);
}

If this is not possible in WPF, then i doubt that it's possable anyhow.

Answer 2

Since you can't define a WndProc directly in WPF, you need to obtain a HwndSource, and add a hook to it :

public Window1()
{
    InitializeComponent();

    this.SourceInitialized += Window1_SourceInitialized;
}

private void Window1_SourceInitialized(object sender, EventArgs e)
{
    WindowInteropHelper helper = new WindowInteropHelper(this);
    HwndSource source = HwndSource.FromHwnd(helper.Handle);
    source.AddHook(WndProc);    
}

const int WM_SYSCOMMAND = 0x0112;
const int SC_MOVE = 0xF010;

private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam,  ref bool handled)
{

   switch(msg)
   {
      case WM_SYSCOMMAND:
          int command = wParam.ToInt32() & 0xfff0;
          if (command == SC_MOVE)
          {
             handled = true;
          }
          break;
      default:
          break;
   }
   return IntPtr.Zero;
}