Using ON_COMMAND_RANGE and ON_UPDATE_COMMAND_UI_RANGE

7 Jul 2003 17:13 mfc

The ON_COMMAND_RANGE and ON_UPDATE_COMMAND_UI_RANGE macros are useful when you want to treat a group of commands similarly. In this case, it’s the commands for changing list view style. The command IDs must be contiguous, and you must specify the lower one first.

    BEGIN_MESSAGE_MAP(CCustomDrawDlg, CDialog)
        //{{AFX_MSG_MAP(CCustomDrawDlg)
        //...
        //}}AFX_MSG_MAP
        // ClassWizard can't handle these, so they go outside the AFX_MSG_MAP
        ON_UPDATE_COMMAND_UI_RANGE(ID_VIEW_SMALLICON, ID_VIEW_DETAILS, OnUpdateViewStyle)
        ON_COMMAND_RANGE(ID_VIEW_SMALLICON, ID_VIEW_DETAILS, OnViewStyle)
    END_MESSAGE_MAP()

void CCustomDrawDlg::OnViewStyle(UINT nID)
{
    DWORD dwStyle = -1;

    switch (nID)
    {
    case ID_VIEW_DETAILS:
        dwStyle = LVS_REPORT;
        break;

    case ID_VIEW_SMALLICON:
        dwStyle = LVS_SMALLICON;
        break;

    case ID_VIEW_LARGEICON:
        dwStyle = LVS_ICON;
        break;

    case ID_VIEW_LIST:
        dwStyle = LVS_LIST;
        break;
    }

    // change the style; window will repaint automatically
    if (dwStyle != -1)
        m_listCtrl.ModifyStyle(LVS_TYPEMASK, dwStyle, 0);
}

void CCustomDrawDlg::OnUpdateViewStyle(CCmdUI* pCmdUI)
{
    DWORD dwStyle = m_listCtrl.GetStyle();
    dwStyle &= LVS_TYPEMASK;

    pCmdUI->Enable();
    BOOL bChecked = FALSE;

    switch (pCmdUI->m_nID)
    {
    case ID_VIEW_DETAILS:
        bChecked = (dwStyle == LVS_REPORT);
        break;

    case ID_VIEW_SMALLICON:
        bChecked = (dwStyle == LVS_SMALLICON);
        break;

    case ID_VIEW_LARGEICON:
        bChecked = (dwStyle == LVS_ICON);
        break;

    case ID_VIEW_LIST:
        bChecked = (dwStyle == LVS_LIST);
        break;

    default:
        bChecked = FALSE;
        break;
    }

    pCmdUI->SetRadio(bChecked ? 1 : 0);
}