WPF – disable window moving by dragging the title bar

Updated on March 21, 2016     Kisan Patel

Problem:

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

Solution:

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

public MainWindow()
{
    InitializeComponent();
    this.SourceInitialized += MainWindow_SourceInitialized;
}

private void MainWindow_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;
 }

Source: http://stackoverflow.com/questions/2400819/wpf-disable-window-moving