C / C++ / MFC

beeejay wrote:

Ok i tried somthing similiar but the window is being drawn in my location and then in the location it would be had I not interfered.

beeejay wrote:

How are you calling this within the wndProcedure? Is there a window callback in mfc as there is in win32?

LRESULT WindowProc( ... )
{
    switch( message )
    {
        case WM_MOVING:
            OnMoving( ... ); // Pass in required parameters.
    }

    DefWindowProc( ... );
}

::GetParent( hWndChild );

beeejay wrote:

OK it doesn't look like there is an OnMoving function within the SDK.

beeejay wrote:

would your program function the same way if you were just to paste the contents of your method into the WM_MOVING case?

case WM_MOVING:
        {
            LPRECT lpRect = ( LPRECT )lParam;

            static RECT rcPreviousCoords = *lpRect;
            
            // Get parent window
            HWND pParentWnd = ::GetParent( hWnd );
            
            if( !pParentWnd )
                break ;
            
            RECT crParentRect;
            ::GetClientRect( pParentWnd, &crParentRect );
            ::ClientToScreen(pParentWnd, (LPPOINT)&crParentRect);
	    ::ClientToScreen(pParentWnd, ((LPPOINT)&crParentRect)+1);
            
            if( lpRect->left <= crParentRect.left || lpRect->right >= crParentRect.right )
            {
                lpRect->left = rcPreviousCoords.left;
                lpRect->right = rcPreviousCoords.right;
            }
            else
            {
                rcPreviousCoords.left = lpRect->left;
                rcPreviousCoords.right = lpRect->right;
            }
            
            if( lpRect->top <= crParentRect.top || lpRect->bottom >= crParentRect.bottom )
            {
                lpRect->top = rcPreviousCoords.top;
                lpRect->bottom = rcPreviousCoords.bottom;
            }
            else
            {
                rcPreviousCoords.top = lpRect->top;
                rcPreviousCoords.bottom = lpRect->bottom;
            }

            return TRUE;
        }

RECT rect;
GetWindowRect( hWnd, &rect );

    if ( rect.right > xMax )
        rect.left = xMax - ( rect.right - rect.left );
    if ( rect.left < xMin )
        rect.left = xMin;
    if ( rect.bottom > yMax )
        rect.top = yMax - ( rect.bottom - rect.top );
    if ( rect.top < yMin )
        rect.top = yMin;

SetWindowPos( hWnd, HWND_TOP, rect.left, rect.top, 0, 0, SWP_SHOWWINDOW | SWP_NOSIZE );

return true;

beeejay wrote:

SetWindowPos( hWnd, HWND_TOP, rect.left, rect.top, 0, 0, SWP_SHOWWINDOW | SWP_NOSIZE );

beeejay wrote:

It seems that the rect which GetWindowRect sets doesn't actually get used after my WM_MOVING hanlder is complete.

<code>lParam: </code>
Pointer to a <code>RECT </code>structure with the current position of the window, in screen coordinates. 
<code>To change the position of the drag rectangle, an application must change the members of this structure.</code> 

// Code with warning.
void Foo(int n)
{
    // We don't use 'n'.
}
 
// Code without warning.
void Foo(int)
{
}