如何在MFC中获得多行工具提示 [英] How do I get a multi line tooltip in MFC

问题描述

现在，当我将鼠标悬停在编辑框上时，会弹出一个工具提示.问题在于此工具提示包含多个错误消息，并且它们都排成一行.我需要每个错误消息都在自己的行上.错误消息包含在CString中，并用新行将它们分开.

Right now, I have a tool tip that pops up when I hover over an edit box. The problem is that this tool tip contains multiple error messages and they are all in one long line. I need to have each error message be on its own line. The error messages are contained in a CString with a new line seperating them.

下面是我现有的代码.

BOOL OnToolTipText(UINT, NMHDR* pNMHDR, LRESULT* pResult)
{
    ASSERT(pNMHDR->code == TTN_NEEDTEXTA || pNMHDR->code == TTN_NEEDTEXTW);
    // need to handle both ANSI and UNICODE versions of the message
    TOOLTIPTEXTA* pTTTA = (TOOLTIPTEXTA*)pNMHDR;
    TOOLTIPTEXTW* pTTTW = (TOOLTIPTEXTW*)pNMHDR;
    //    TCHAR szFullText[256];
    CString strTipText=_T("");
    UINT nID = pNMHDR->idFrom;
    if (pNMHDR->code == TTN_NEEDTEXTA && (pTTTA->uFlags & TTF_IDISHWND) ||
        pNMHDR->code == TTN_NEEDTEXTW && (pTTTW->uFlags & TTF_IDISHWND))
    {
        // idFrom is actually the HWND of the tool
        nID = ::GetDlgCtrlID((HWND)nID);
    }

    //m_errProjAccel[ch] contains 1 or more error messages each seperated by a new line.
    if((int)nID >= ID_PROJECTED_ACCEL1 && (int)nID < ID_PROJECTED_ACCEL1 + PROJECTED_ROWS -1 ) {
        int ch = nID - ID_PROJECTED_ACCEL1;
        strTipText = m_errProjAccel[ch];
    } 


#ifndef _UNICODE
    if (pNMHDR->code == TTN_NEEDTEXTA)
        lstrcpyn(pTTTA->szText, strTipText, sizeof(pTTTA->szText)/sizeof(pTTTA->szText[0]));
    else
        _mbstowcsz(pTTTW->szText, strTipText, sizeof(pTTTA->szText)/sizeof(pTTTA->szText[0]));
#else
    if (pNMHDR->code == TTN_NEEDTEXTA)
        _wcstombsz(pTTTA->szText, strTipText, sizeof(pTTTA->szText)/sizeof(pTTTA->szText[0]));
    else
        lstrcpyn(pTTTW->szText, strTipText, sizeof(pTTTA->szText)/sizeof(pTTTA->szText[0]));
#endif
    *pResult = 0;

    // bring the tooltip window above other popup windows
    ::SetWindowPos(pNMHDR->hwndFrom, HWND_TOP, 0, 0, 0, 0,
        SWP_NOACTIVATE|SWP_NOSIZE|SWP_NOMOVE|SWP_NOOWNERZORDER);

    return TRUE;    // message was handled
}

推荐答案

TTM_SETMAXTIPWIDTH消息发送到ToolTip控件，以响应TTN_GETDISPINFO通知，以强制其使用多行.在您的字符串中，应使用\r\n分隔行.

Creating multiline tooltips is explained here in the MSDN library - read the "Implementing Multiline ToolTips" section. You should send a TTM_SETMAXTIPWIDTH message to the ToolTip control in response to a TTN_GETDISPINFO notification to force it to use multiple lines. In your string you should separate lines with \r\n.

此外，如果您的文本超过80个字符，则应使用NMTTDISPINFO结构的lpszText成员，而不是复制到szText数组中.

Also, if your text is more than 80 characters, you should use the lpszText member of the NMTTDISPINFO structure instead of copying into the szText array.

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