OnNcCalcSize...

I'm looking for a way to override the OnNcCalcSize member function to only allow my CView derived class (and it's FrameWindow of course!)  to be a certain width -  XWIDTH.  I want to be able to change my resizing values if they are greater than XWIDTH, to equal XWIDTH.  What is the best way to do this?  I attempted to change the values of lpncsp->rgrc[0], and then call the default CWnd::OnNcCalcSize() function with very bizarre results...  Any suggestions?
salamanderAsked:
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MelangeCommented:
Are you simply attempting to prevent a user from sizing your window too big? Or do you need to do something more complex?

To keep the window within a certain size override the WM_GETMINMAXINFO message for that window (or frame).

For example in an SDI app:

void CMainFrame::OnGetMinMaxInfo( MINMAXINFO *lpMMI )
{
    lpMMI->ptMaxSize.x = 500;
    lpMMI->ptMaxSize.y = 300;

    CFrameWnd::OnGetMinMaxInfo( lpMMI );
}

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salamanderAuthor Commented:
I added this function to my CView class, with values for lpMMI->ptMaxSize.x and lpMMI->ptMaxSize.y, yet my application allowed resizing past these values.  This is my code:

void CReviewView::OnGetMinMaxInfo(MINMAXINFO FAR* lpMMI)
{
      lpMMI->ptMaxSize.x = 641;
      lpMMI->ptMaxSize.y = 300;

      CWnd::OnGetMinMaxInfo(lpMMI);
}

This is an MDI application.  Any suggestions?
0
salamanderAuthor Commented:
I added this function to my CView class, with values for lpMMI->ptMaxSize.x and lpMMI->ptMaxSize.y, yet my application allowed resizing past these values.  This is my code:

void CReviewView::OnGetMinMaxInfo(MINMAXINFO FAR* lpMMI)
{
      lpMMI->ptMaxSize.x = 641;
      lpMMI->ptMaxSize.y = 300;

      CWnd::OnGetMinMaxInfo(lpMMI);
}

This is an MDI application.  Any suggestions?
0
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salamanderAuthor Commented:
I added this function to my CView class, with values for lpMMI->ptMaxSize.x and lpMMI->ptMaxSize.y, yet my application allowed resizing past these values.  This is my code:

void CReviewView::OnGetMinMaxInfo(MINMAXINFO FAR* lpMMI)
{
      lpMMI->ptMaxSize.x = 641;
      lpMMI->ptMaxSize.y = 300;

      CWnd::OnGetMinMaxInfo(lpMMI);
}

This is an MDI application.  Any suggestions?
0
MelangeCommented:
You need to do it to the frame window for the view. The view window is actually a child window inside the frame window and doesn't include the borders and title bar. It's actually the frame window that you are resizing.
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salamanderAuthor Commented:
I have removed the CView code and inserted it into my CChildFrame code as such:

void CChildFrame::OnGetMinMaxInfo(MINMAXINFO FAR* lpMMI)
{
      lpMMI->ptMaxSize.x = 641;
      lpMMI->ptMaxSize.y = 300;

      CWnd::OnGetMinMaxInfo(lpMMI);
}

When I run this, it still doesn't work.  The values after calling the default OnGetMinMaxInfo() return to what they were.
0
salamanderAuthor Commented:
It doesn't work if you leave out the default call, either.
0
MelangeCommented:
You need to set the MaxTrackSize values in the MINMAXINFO structure. This will do it.

Add these two lines to OnGetMinMaxInfo:

lpMMI->ptMaxTrackSize.x = MaxXValue;
lpMMI->ptMaxTrackSize.y = MaxYValue;

also set the ptMinTrackSize values if you want the window to be at LEAST a certain size.

0

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salamanderAuthor Commented:
This works (thank you!)  but how do I change these values on the fly?  For example, how can I check the document associated with this child frame to get the values for MaxX and MaxY?
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MelangeCommented:
The WM_GETMINMAXINFO message keeps getting sent (I believe, but not entirely sure) every time the user attempts to size the window.

To check your current desired size you can use any number of approaches, but the main problem is how do you get access to your document, right? You can call the CFrameWnd function GetActiveDocument which will return a CDocument pointer for the document that the window currently represents. Then, you'll need to cast it to the correct document to access the appropraite class members.

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salamanderAuthor Commented:
Thanks a lot.
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