Hi,

you don't receive WM_LBUTTONDOWN for "top" border because you cantch WM_NCHITTEST and return HTCAPTION instead of HTCLIENT for top border...

Thanks oleg for your speedy reply

But we are not able to resize on the top ( It is not recieving WM_LBUTTONDOWN when clicked on the top ) Please advice

Can you also advice how to bring the resize gripper on the right bottom most corner.

our code

//////////////

BOOL CToolDlg::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
 CPoint pt;
 GetCursorPos(&pt);

 CRect rc;
 GetWindowRect(&rc);

 if ( pt.x > rc.right - 4 )
 {
  SetCursor( LoadCursor(0, IDC_SIZEWE) );
  return TRUE;
 }  

 if ( pt.x == rc.left )
 {
  SetCursor( LoadCursor(0, IDC_SIZEWE) );
  return TRUE;
 }

 if ( pt.y == rc.top  )
 {
  SetCursor( LoadCursor(0, IDC_SIZENS) );
  return TRUE;
 }

 if ( pt.y > rc.bottom -4  )
 {
  SetCursor( LoadCursor(0, IDC_SIZENWSE) );
  return TRUE;
 }

 return CDialog::OnSetCursor(pWnd, nHitTest, message);
}

void CToolDlg::OnLButtonDown(UINT nFlags, CPoint point)
{

 CPoint pt;
 GetCursorPos(&pt);
 CRect rc;
 GetWindowRect(&rc);

 if ( pt.x > rc.right - 4 )
 {
  SendMessage(WM_SYSCOMMAND, SC_SIZE + (HTRIGHT - HTSIZEFIRST + 1),
   MAKELPARAM(pt.x, pt.y));  
  return;
 }

 if ( pt.x == rc.left )
 {
  SendMessage(WM_SYSCOMMAND, SC_SIZE + (HTLEFT - HTSIZEFIRST + 1),
   MAKELPARAM(pt.x, pt.y));
  return ;
 }

 if ( pt.y == rc.top  )
 {  
  SendMessage(WM_SYSCOMMAND, SC_SIZE + ( HTTOP - HTSIZELAST + 1 ),
   MAKELPARAM(pt.x, pt.y));
  return ;
 }

 if ( pt.y > rc.bottom -4  )
 {
  SendMessage(WM_SYSCOMMAND, SC_SIZE + (HTBOTTOMRIGHT - HTSIZEFIRST + 1),
   MAKELPARAM(pt.x, pt.y));
  return ;
 }

Thanks

Some hints:

1. You totally removed all borders:

ModifyStyle(WS_BORDER|WS_DLGFRAME|WS_THICKFRAME,0);

So window has no border/has no nonclient area.

2. Because your dialog have no nonclient area/borders

You must manually catch WM_SETCURSOR to change resize cursor and WM_LBUTTONDOWN to send WM_SYSCOMMAND to resize client

sample:

BOOL CToolDlg::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
 CPoint pt;
 GetCursorPos(&pt);
 CRect rc;
 GetWindowRect(&rc);
 if (pt.x > rc.right - 4)
 {
  SetCursor(LoadCursor(0, IDC_SIZEWE));
  return TRUE;
 }
 
 
 return CDialogSampleDlgBase::OnSetCursor(pWnd, nHitTest, message);
}

void CToolDlg::OnLButtonDown(UINT nFlags, CPoint point)
{
 CPoint pt;
 GetCursorPos(&pt);
 CRect rc;
 GetWindowRect(&rc);
 if (pt.x > rc.right - 4)
 {
  SendMessage(WM_SYSCOMMAND, SC_SIZE + (HTRIGHT - HTSIZEFIRST + 1),
   MAKELPARAM(pt.x, pt.y));

  return;
 }
 
 CDialogSampleDlgBase::OnLButtonDown(nFlags, point);
}