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Problems with WS_THICKFRAME

Posted on 2001-08-21
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Last Modified: 2013-11-20
Hi!
I want to show a small window in my CView derived window in order to let the user to move and resize it. What I did was to derive a class from CWnd (CSelectWnd) and then I handled WM_LBUTTONDOWN/WM_LBUTTONUP AND WM_MOUSEMOVE.
The code I used is the following:
void CSelectWnd::OnLButtonDown(UINT nFlags, CPoint point)
{
     SetCapture();
     m_bCaptured = true;
     CWnd::OnLButtonDown(nFlags, point);
}

void CSelectWnd::OnLButtonUp(UINT nFlags, CPoint point)
{
     ReleaseCapture();
        m_bCaptured = false;
     CWnd::OnLButtonUp(nFlags, point);
}
void CSelectWnd::OnMouseMove(UINT nFlags, CPoint point)
{
     if (m_bCaptured)
     {
          CWnd* pParent = GetParent();
         
          //Retrieve the old postion (in parent client coordinates)
          CRect oldPos;
          GetClientRect(&oldPos);
          ClientToScreen(oldPos);
          pParent->ScreenToClient(&oldPos);
         
          //Work out the new position (in parent client coordinates)
          CRect newPos(point.x - m_nDragOffset.x, point.y - m_nDragOffset.y,
               point.x - m_nDragOffset.x + oldPos.Width(), point.y  - m_nDragOffset.y + oldPos.Height());
          ClientToScreen(&newPos);
          pParent->ScreenToClient(&newPos);
         
          //Only move the window if it is inside the client rect of the parent window
          CRect clientRect;
          pParent->GetClientRect(&clientRect);
          if (newPos.left >= clientRect.left && newPos.top >= clientRect.top &&
               newPos.right < clientRect.right && newPos.bottom < clientRect.bottom)
          {
               newPos.InflateRect(3,3);
               MoveWindow(newPos, FALSE);
               oldPos.InflateRect(3,3);
               pParent->InvalidateRect(oldPos, FALSE);
               Invalidate(TRUE);
               CWnd::OnMouseMove(nFlags, point);
          }


     }
     else
          CWnd::OnMouseMove(nFlags, point);
}

Then in my view class I create an instance of this class as follows:

int CMyView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
     if (CView::OnCreate(lpCreateStruct) == -1)
          return -1;

     CRect rect(100,100,500,500);
     
     m_Select.Create(NULL, "TestClass", WS_VISIBLE|WS_CHILD|WS_THICKFRAME   , rect, this, 0xFFFF);


     return 0;
}

The window is correctly creatly but when I move the CSelectWnd derived window, it is not properly repainted. However it is correctly repainted if I remove thw WS_THICKFRAME style.
Any solution?

Thanks
Carlos

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Question by:qocarlos
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2 Comments
 
LVL 9

Accepted Solution

by:
Pacman earned 800 total points
ID: 6412346
in your mousemove function you use GetClientRect().
This function gives you the coordinates of the client-area of the window. Use GetWindowRect() to get the exterior rectangle of the window.
PS: GetWindowRect() comes already with screen coordinates so you don't have to call ClientToScreen().

Pacman
0
 
LVL 3

Author Comment

by:qocarlos
ID: 6413858
Thanks Pacman,
GetWindowRect can do the job. I will try it out and let you know if it works.

Carlos
0

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