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Posted on 1998-10-30
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how can i prevent the user to change the size and position of a formview based windows(visual c++ MFC).
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Question by:saidi
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by:danny_pav
ID: 1176570
1.  You could make the border not allow sizing.
or
2.  Use WM_GETMINMAXINFO
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nietod earned 150 total points
ID: 1176571
To elaborate on danny's explanations

>> You could make the border not allow sizing.

Specify a window style that does not have the WS_THICKFRAME style.  Note that some of the window styles are are made up of a a bunch of styles that are ORed toegether and might include this style without you realizing it.  For example, the WS_OVERLAPPEDWINDOW and WS_POPUPWINDOW styles both include the thick frame style.

This would prevent sizing, however the user could still move the window.  To prevent them from moving it you would also have to have a style that does not have the WS_CAPTION style.    That would produce a window without a title bar (caption).  However, I suspect you don't want that.

Another approach would be to handle the WM_WINDOWPOSCHANGING message.  This is sent to the window before it is moved and specifies the window's new position and size information.  You can adjust this information so that the window is "moved" to where it already is.  

The problem with this is that it would allow the user to try to move/resize the window with the mouse, but when they let go the window would not move or resize.  If that is a problem, you could get around it by intercepting the WM_NCHITTEST message.  And converting hits on the sizing edges (HTBOTTOM, HTBOTTOMLEFT, etc.) and hits on the caption (HTCAPTION) to HTBORDER.  (You might think this would be enough.  i.e handling this message is enough and you wouldn't need to handle the position changing message, but there are ways to resize/move the window that don't use the mouse.  handling the WM_WINDOWPOSCHANGiNG message insures that the user or orther programs can't move or resize the window using any means.
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by:nietod
ID: 1176572
Do you still need help with this?

Is this a question that was "answered" on another question.  It seems familiar.
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