Visual C++ and MFC Programming 2nd Edition

Visual C++ and MFC Fundamentals Chapter 15: Fundamental Controls

Horz Align: Default

Vert Align: Top

Horz Align: Left

Vert Align: Default

Horz Align: Default or Center

Vert Align: Default or Center

Horz Align: Right

Vert Align: Default

Horz Align: Default

Vert Align: Bottom

After creating a control, to make sure that it displays when its host control comes up, set

its Visible property to True or checked (the default). Otherwise, if you want it to be

hidden for example to wait for an intermediary action from the user, you can set its

Visible property to False or unchecked. For example, to display a control, whether it is

hidden or not, call the CWnd::ShowWindow() method and pass SW_SHOW as its

argument:

BOOL CDialog5Dlg::OnInitDialog()

{

CDialog::OnInitDialog();

SetIcon(m_hIcon, TRUE); // Set big icon

SetIcon(m_hIcon, FALSE); // Set small icon

// TODO: Add extra initialization here

m_Submit.ShowWindow(SW_SHOW);

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

}

In the same way, to hide a control, call it by passing the SW_HIDE constant as argument.

For the user to be able to use a control such as clicking a button, the control must allow it.

This characteristic of Windows objects is controlled by the CWnd::EnableWindow()

method. Its syntax is:

BOOL EnableWindow(BOOL bEnable = TRUE);

This method is used to enable or disable a control. The default value of the argument

bEnable is set to TRUE, which would display a control. To disable a control, set the

argument to FALSE. Here is an example:

void CDialog5Dlg::OnLetItBe()

{

// TODO: Add your control notification handler code here

m_Submit.EnableWindow(FALSE);

}

15.4.3..Buttons Messages................................................................................

The most regular action users perform on a button is to click it. When a user does this, the

button sends a BN_CLICKED message. In some but rare circumstances, you may also

ask the user to double-click a button. Over all, you will take care of most message

handling when the user clicks a button.