MFC - Managing the Updown Control
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Step 1 − Add a control variable m_spinControl for spin control with the settings as shown in the following snapshot.
Step 2 − Add the control variable m_editControl for Edit control.
Step 3 − Add the event handler for UDN_DELTAPOS event for the spin button.
Step 4 − Update the OnInitDialog() as shown in the following code.
BOOL CMFCSpinButtonDlg::OnInitDialog() { CDialogEx::OnInitDialog(); // Set the icon for this dialog. The framework does this automatically // when the application's main window is not a dialog SetIcon(m_hIcon, TRUE); // Set big icon SetIcon(m_hIcon, FALSE); // Set small icon // TODO: Add extra initialization here m_spinControl.SetRange(0, 100); m_spinControl.SetPos(50); m_editControl.SetWindowText(L"50"); return TRUE; // return TRUE unless you set the focus to a control }
Step 5 − Here is the implementation of spin control event.
void CMFCSpinButtonDlg::OnDeltaposSpin1(NMHDR *pNMHDR, LRESULT *pResult) { LPNMUPDOWN pNMUpDown = reinterpret_cast<LPNMUPDOWN>(pNMHDR); // TODO: Add your control notification handler code here // Declare a pointer to a CSpinButtonCtrl; CSpinButtonCtrl *Spinner; // Get a pointer to our spin button Spinner = reinterpret_cast<CSpinButtonCtrl *>(GetDlgItem(IDC_SPIN1)); // Found out if it is our spin button that sent the message // This conditional statement appears useless but so what? if (pNMHDR -> hwndFrom == Spinner -> m_hWnd) { // Get the current value of the spin button int CurPos = pNMUpDown→iPos; // Convert the value to a string CString str; str.Format(L"%d", CurPos); // Display the value into the accompanying edit box m_editControl.SetWindowText(str); } *pResult = 0; }
Step 6 − When the above code is compiled and executed, you will see the following output.
mfc_windows_controls.htm
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