在运行时设置CMenu项目提示 [英] Set CMenu item prompt at runtime

问题描述

如何在运行时设置CMenu项提示?我知道可以在VS中的资源编辑器中完成此操作，但是我没有这样的资源，无法创建菜单，而且菜单项是动态的.

How can I set a CMenu item prompt at runtime? I know that it can be done in resource editor in VS, but I don't have such resource and create menu and it's items dynamically.

推荐答案

如果使用的是MFC Feature Pack，则需要覆盖MainFrame类的OnMenuButtonToolHitTest:

If you are using MFC Feature Pack, you will need to override the OnMenuButtonToolHitTest of your MainFrame class:

BOOL CMainFrame::OnMenuButtonToolHitTest(CMFCToolBarButton* pButton, TOOLINFO* pTI)
{
    if(!pButton)
        return FALSE;
    if(!pTI)
        return FALSE;

    if (pButton->m_nID == UINT(-1)) //not a menu-item, but an opener menu for a sub-menu
        return FALSE;

    // Stolen from CMFCToolBar::OnToolHitTest on file afxtoolbar.cpp

    // It is not needed to do the GetMessageString part, because it already done
    // on function CMFCPopupMenuBar::OnToolHitTest of afxpopupmenubar.cpp file, which
    // supplies the two parts to the Tooltip Manager

    CString strTipText;
    TCHAR szFullText[256];

    AfxLoadString(pButton->m_nID, szFullText);
    AfxExtractSubString(strTipText, szFullText, 1, '\n');

    pTI->lpszText = _tcsdup(strTipText);

    return TRUE;
}

您将必须在资源文件中定义与菜单完全相同的ID的字符串.其格式为Prompt text\nPrompt title.我不确定，但是我认为您唯一可以换行的是将标题和文本分开的行.

You will have to define in your resource file strings with the EXACT same ID as your menus; and their format is Prompt text\nPrompt title. I am not sure but I think the only new line you can have is the one that separates title from text.

除了使用鼠标悬停菜单时仅显示提示之外，您可能还需要做其他事情.您可以通过覆盖MainFrame类的OnMenuSelect来做到这一点:

You may also want to do things beyond simply displaying prompts when hovering menus using the mouse. You can do it by overriding OnMenuSelect of your MainFrame class:

void CMainFrame::OnMenuSelect(UINT nItemID, UINT nFlags, HMENU hSysMenu)
{
    if (nItemID == ID_MENU_I_WANT_TO_PROCESS)
    {
        DoThings(); 
    }

    __super::OnMenuSelect(nItemID, nFlags, hSysMenu);
}

我建议您对MainFrame类上的GetMessageString函数进行覆盖，并在其中放置一个断点，以了解流程的进行.

I recommend you to make an override to GetMessageString function on your MainFrame class and put a breakpoint there for you see how the flow goes.

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