Visual C++ and MFC Programming 2nd Edition

Chapter 18: Progress-Based Controls Visual C++ and MFC Fundamentals

In the same way, you can set the Align property to a Bottom/Right value to keep the

bottom border for a horizontal scroll bar or the right border for a vertical scroll bar and

resize them to the default height or width respectively.

If you are programmaticall creating the control, to resize a horizontal scroll bar to assume

the default height known to the operating system combine the SBS_HORZ with the

SBS_TOPALIGN and possibly the SBS_BOTTOMALIGN values to its style. On the

other hand, to get the default width of a vertical scroll bar, besides the SBS_VERT style,

add the SBS_LEFTALIGN and the SBS_RIGHTALIGN values:

BOOL CScrollingDlg::OnInitDialog()

{

CDialog::OnInitDialog();

// TODO: Add extra initialization here

Scroller->Create(WS_CHILD | WS_VISIBLE |

SBS_VERT | SBS_LEFTALIGN | SBS_RIGHTALIGN,

CRect(200, 15, 320, 148), this, 0x16);

return TRUE; // return TRUE unless you set the focus to a control

// EXCEPTION: OCX Property Pages should return FALSE

}

We mentioned already that the operating system keeps a default height for a horizontal

scroll bar and a default width for a vertical scroll bar. To get these default values and

apply them to your scroll bar control, call the GetSystemMetrics() function and pass it

either the SM_CXVSCROLL or the SM_CXHSCROLL value. Then add the value to

the x member of the rect argument for the Create() method. Here is an example: