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MFC, resize control in CDialog app

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This OnSize function resizes one large control in a dialog.
The one control grows horizontally and vertically to fill the dialog. It's position remains unchanged.
Other controls (buttons etc) would typically be above the one resizable control.

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  1. // This OnSize function resizes one large control in a dialog. 
  2. // The one control grows horizontally and vertically to fill the dialog. It's position remains unchanged.
  3. // Other controls (buttons etc) would typically be above the one resizable control.
  4. // How to add OnSize:
  5. // [1] add to .h:                     afx_msg void OnSize(UINT nType, int cx, int cy);
  6. // [2] add to message map in .cpp:    ON_WM_SIZE()
  7. // [3] add this OnSize function.
  8. void CMyDlg::OnSize(UINT nType, int formWidthArg, int formHeightArg)
  9. {
  10.    CDialog::OnSize(nType, formWidthArg, formHeightArg); // Let dialog resize itself.
  11.  
  12.    // http://www.codersource.net/mfc_resize_controls.html
  13.    // http://wwwusers.brookes.ac.uk/p0071643/resize.htm
  14.  
  15.    // get pointer to the control to be resized dynamically
  16.    CWnd* pCtl = GetDlgItem(IDC_MSFLEXGRID1);
  17.  
  18.    if (!pCtl) { return; } // control may not exist yet.
  19.  
  20.    CRect rectCtl;                 // Allocate CRect for control's position.
  21.    pCtl->GetWindowRect(&rectCtl); // Get control's position.
  22.    ScreenToClient(&rectCtl);      // Convert from absolute screen coordinates to dialog-relative coordinates.
  23.  
  24.    // Now resize the control dynamically by calling MoveWindow
  25.    // rectCtl.left is assumed to be the left, bottom and right margin for the control. 
  26.    pCtl->MoveWindow(
  27.       rectCtl.left,                               // x. remains unchanged
  28.       rectCtl.top,                                // y. remains unchanged
  29.       formWidthArg - 2 * rectCtl.left,            // w. Grow to fill horizontally
  30.       formHeightArg - rectCtl.top - rectCtl.left, // h. Grow to fill vertically
  31.       TRUE)
  32.    ;
  33.  
  34.    return;
  35. } // OnSize()

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