2.1 如何动态添加和删除菜单项

四个方法:AppendMenu,InsertMenu,RemoveMenu,DeleteMenu

/////////////////////////////////////////////////////////////////////////////
// CMainFrame message handlers
void CMainFrame::OnAppendMenu() 
{
    //获得主菜单
    CMenu* pMenu = GetMenu();
    //获得子菜单
    CMenu* pSubMenu = pMenu->GetSubMenu(4);

    if (pSubMenu->GetMenuItemCount() == 4)
    {
        //在菜单末端添加菜单项
        pSubMenu->AppendMenu(MF_STRING, ID_TEST_MENU, _T("新菜单项"));

        //重画菜单
        DrawMenuBar();
    }
}

void CMainFrame::OnInsertMenu() 
{
    //获得主菜单
    CMenu* pMenu = GetMenu();
    //获得子菜单
    CMenu* pSubMenu = pMenu->GetSubMenu(4);

    if (pSubMenu->GetMenuItemCount() == 4)
    {
        //在菜单指定位置添加菜单项
        pSubMenu->InsertMenu(1, MF_BYPOSITION, ID_TEST_MENU, _T("新菜单项"));

        //重画菜单
        DrawMenuBar();
    }
}

void CMainFrame::OnRemoveMenu() 
{
    //获得主菜单
    CMenu* pMenu = GetMenu();
    //获得子菜单
    CMenu* pSubMenu = pMenu->GetSubMenu(4);

    if (pSubMenu->GetMenuItemCount() == 5)
    {
         //删除菜单项
         pSubMenu->RemoveMenu(4, MF_BYPOSITION);

        //重画菜单
        DrawMenuBar();
    }
}

void CMainFrame::OnDeleteMenu() 
{
    //获得主菜单
    CMenu* pMenu = GetMenu();
    //获得子菜单
    CMenu* pSubMenu = pMenu->GetSubMenu(4);

    if (pSubMenu->GetMenuItemCount() == 5)
    {
         //删除菜单项
         pSubMenu->DeleteMenu(4, MF_BYPOSITION);

        //重画菜单
        DrawMenuBar();
    }
}

2.2 如何在系统菜单中添加菜单项

GetSystemMenu方法

    //获得系统菜单
    CMenu* pMenu = GetSystemMenu(FALSE);

    //删除系统菜单项
    pMenu->RemoveMenu(SC_MOVE, MF_STRING);

    //添加菜单项
    pMenu->InsertMenu(0, MF_BYPOSITION, ID_TEST_MENU, _T("测试菜单项"));

2.3 如何禁用关闭按钮

EnableMenuItem方法

    //获得系统菜单
    CMenu* pMenu = GetSystemMenu(FALSE);

    //禁用关闭按钮
    pMenu->EnableMenuItem(SC_CLOSE, MF_BYCOMMAND | MF_GRAYED);

2.4 如何启用和禁用菜单项

使用CCmdUI对象

void CMainFrame::OnTestMenu1() 
{
    m_bEnable1 = FALSE;
    m_bEnable2 = TRUE;
}

void CMainFrame::OnUpdateTestMenu1(CCmdUI* pCmdUI) 
{
    //启用或禁用菜单1
    pCmdUI->Enable(m_bEnable1);    
}

void CMainFrame::OnTestMenu2() 
{
    m_bEnable1 = TRUE;
    m_bEnable2 = FALSE;    
}

void CMainFrame::OnUpdateTestMenu2(CCmdUI* pCmdUI) 
{
    //启用或禁用菜单2
    pCmdUI->Enable(m_bEnable2);
}

2.5 如何设置菜单项的检查状态

CheckMenuItem方法

CheckMenuRadioItem则是单选

void CMainFrame::OnUpdateTestMenu(CCmdUI* pCmdUI) 
{
    CMenu menu;
    //menu.CheckMenuItem();
    //设置菜单项检查状态
    pCmdUI->SetCheck(m_nCheck);    
}

2.6 如何实现快捷菜单(右键菜单)

TrackPopupMenu方法

void CDemoView::OnContextMenu(CWnd* pWnd, CPoint point) 
{
    CMenu menu;

    //加载菜单
    if (!menu.LoadMenu(IDR_MENU))
    {
        return;
    }

    //获得子菜单
    CMenu* pPopupMenu = menu.GetSubMenu(0);

    //弹出菜单
    pPopupMenu->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON, 
        point.x, point.y, pWnd);  
}

2.7 如何获得光标的位置

m_Point为mousemove时的坐标

void CDemoView::OnDraw(CDC* pDC)
{
    //获得客户区坐标
    CRect rect;
    GetClientRect(rect);

    //绘制十字光标
    pDC->MoveTo(0, m_Point.y);
    pDC->LineTo(rect.Width(), m_Point.y);
    pDC->MoveTo(m_Point.x, 0);
    pDC->LineTo(m_Point.x, rect.Height());

    //输出光标坐标
    CString strText =_T("");
    strText.Format(_T("%d, %d"), m_Point.x, m_Point.y);
    pDC->SetBkMode(TRANSPARENT);
    pDC->SetTextAlign(TA_RIGHT | TA_BOTTOM);
    pDC->TextOut(m_Point.x, m_Point.y, strText);
}

2.8 如何限制光标的移动范围

ClipCursor方法

void CDemoView::OnLButtonDown(UINT nFlags, CPoint point) 
{
    //获得客户区坐标
    CRect rect;
    GetClientRect(rect);

    rect.left = rect.left + rect.Width() / 4;
    rect.right = rect.right - rect.Width() / 4;
    rect.top = rect.top + rect.Height() / 4;
    rect.bottom = rect.bottom - rect.Height() / 4;

    //映射屏幕坐标
    ClientToScreen(rect);

    //限制光标移动范围
    ClipCursor(&rect);

    CView::OnLButtonDown(nFlags, point);
}

void CDemoView::OnLButtonUp(UINT nFlags, CPoint point) 
{
    //光标自由移动
    ClipCursor(NULL);

    CView::OnLButtonUp(nFlags, point);
}

2.9 如何使用预定义光标

LoadStandardCursor方法和SetCursor方法

BOOL CDemoView::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) 
{
    //设置光标
    ::SetCursor(m_hCursor);

    return TRUE;
//    return CView::OnSetCursor(pWnd, nHitTest, message);
}

void CDemoView::OnLButtonDown(UINT nFlags, CPoint point) 
{
    //加载光标
     m_hCursor = AfxGetApp()->LoadStandardCursor(IDC_CROSS);

    //设置光标
    ::SetCursor(m_hCursor);

    CView::OnLButtonDown(nFlags, point);
}

void CDemoView::OnLButtonUp(UINT nFlags, CPoint point) 
{
    //加载光标
    m_hCursor = AfxGetApp()->LoadStandardCursor(IDC_SIZENWSE);

    //设置光标
     ::SetCursor(m_hCursor);

    CView::OnLButtonUp(nFlags, point);
}

2.10 如何使用自定义光标

LoadCursor方法载入

BOOL CDemoView::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) 
{
    //设置光标
    ::SetCursor(m_hCursor);

    return TRUE;
//    return CView::OnSetCursor(pWnd, nHitTest, message);
}

void CDemoView::OnLButtonDown(UINT nFlags, CPoint point) 
{
    //加载光标
     m_hCursor = AfxGetApp()->LoadCursor(IDC_CURSOR2);

    //设置光标
    ::SetCursor(m_hCursor);

    CView::OnLButtonDown(nFlags, point);
}

void CDemoView::OnLButtonUp(UINT nFlags, CPoint point) 
{
    //加载光标
    m_hCursor = AfxGetApp()->LoadCursor(IDC_CURSOR1);

    //设置光标
     ::SetCursor(m_hCursor);

    CView::OnLButtonUp(nFlags, point);
}

2.11 如何使用等待光标

BeginWaitCursor和EndWaitCursor

void CDemoView::OnLButtonDown(UINT nFlags, CPoint point) 
{
    //启动等待光标
    BeginWaitCursor();

    //休眠
    Sleep(5000);

    //结束等待光标
    EndWaitCursor();

    CView::OnLButtonDown(nFlags, point);
}