Visual C++ and MFC Programming 2nd Edition

Chapter 20: List-Based Controls Visual C++ and MFC Fundamentals

// TODO: Add your control notification handler code here

// Get the state of the Sweetener check box

int CurState = IsDlgButtonChecked(IDC_CHK_SWEETENER);

// Get a handle to the radio buttons of the Options group

CWnd *rdoKetchup, *rdoMustard;

rdoKetchup = reinterpret_cast<CButton *>(GetDlgItem(IDC_KETCHUP));

rdoMustard = reinterpret_cast<CButton *>(GetDlgItem(IDC_MUSTARD));

// If the Sweetener check box is not checked

if( CurState == 0 )

{

// Disable the Options radio buttons

m_SweetOptions.EnableWindow(FALSE);

rdoKetchup->EnableWindow(FALSE);

rdoMustard->EnableWindow(FALSE);

}

else

{

// Otherwise, enable the Options radio buttons

m_SweetOptions.EnableWindow(TRUE);

rdoKetchup->EnableWindow(TRUE);

rdoMustard->EnableWindow(TRUE);

}

}

5. Now, we will give complete or more control to the user with regards to the
   ingredients. When the Regulars check box is not checked at all, no basic ingredient is
   selected, when this control is checked, all ingredients will be added to the sandwich.
   If at least one ingredient is selected and at least one ingredient is not selected, the
   Regulars check box should appear dimmed.
   To implement this, first access the OnInitDialog() event of the CIngredientsDlg
   class and delete the initializations of its check boxes:

BOOL CIngredientsDlg::OnInitDialog()

{

CDialog::OnInitDialog();

// TODO: Add extra initialization here

// CheckDlgButton(IDC_CHK_LETTUCE, BST_CHECKED);

// CheckDlgButton(IDC_CHK_TOMATO, BST_CHECKED);

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

// EXCEPTION: OCX Property Pages should return FALSE

}

6. When the user clicks the Ingredients button, we will display the Ingredients Selection
   dialog box and allow the user to select the ingredients. If the user clicks OK to
   dismiss the dialog box, we will apply the above scenario.
   Access the OnBnClickedBtnIngredients() event of the main dialog box and change
   its code as follows:

void CFastFoodDlg::OnBnClickedBtnIngredients()

{

// TODO: Add your control notification handler code here

// Check the Ingredients check box state

int IngredientState = IsDlgButtonChecked(IDC_CHK_REGULARS);

// A variable for the Ingredients dialog box