如何获取对话框上的列表控件的多行工具提示？

Question

As text on my list box is very huge I am trying to get multiline a tooltip on the list control.

BOOL CTestDlg::OnInitDialog()
{
    CDialogEx::OnInitDialog();

    mylist.EnableToolTips(TRUE);
    mylist.SetExtendedStyle(LVS_EX_INFOTIP | mylist.GetExtendedStyle());

    mylist.InsertColumn(0, L"suri", LVCFMT_LEFT, 10000);
    CString str1 = L"nonNegativeInteger GetVehicleOwnerHolderByRegNumAndDateResponse.GetVehicleOwnerHolderByRegNumAndDateResult[optional].GetVehicleOwnerHolderByRegNumAndDateResultType.VHOwnerHolderResponse.VHOwnerHolderResponseType.Body.VehicleCountries.VehicleCountriesType.VehicleCountry[1, unbound].VehicleCountryType.VehCountryReplies.VehCountryRepliesType.VehCountryReply[1, unbound].Messages[optional].Message[1, unbound].MessageType.MessageCode"; 
    for (int i = 0; i < 20 ; i++) {
        CString str2;
        str2.Format(L"%d",i);
        str2 = str2 + str1;
        mylist.InsertItem(LVIF_TEXT | LVIF_PARAM, i, str2, 0, 0, 0, NULL);
    }

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

I am getting following output which is truncated text ie complete text is missing.

How to get text on tooltip multiline?

EDIT: I used following also. still same result.

CToolTipCtrl* pToolTip = AfxGetModuleThreadState()->m_pToolTip;
   if (pToolTip)
      pToolTip->SetMaxTipWidth(SHRT_MAX);

Answer 1

You can get multi-line tooltips using newlines-charecters with SetMaxTipWidth() set to a large value. And if calling SetMaxTipWidth() with a small value, then it will automatically break into multiple lines when meeting a space-character.

You need to subclass your tooltip/infotip in order to use it:

BEGIN_MESSAGE_MAP(CListCtrl_InfoTip, CListCtrl)
    ON_NOTIFY_REFLECT_EX(LVN_GETINFOTIP, OnGetInfoTip)
    ON_NOTIFY_EX(TTN_NEEDTEXTA, 0, OnToolNeedText)
    ON_NOTIFY_EX(TTN_NEEDTEXTW, 0, OnToolNeedText)
END_MESSAGE_MAP()

void CListCtrl_InfoTip::PreSubclassWindow()
{
    CListCtrl::PreSubclassWindow();
    SetExtendedStyle(LVS_EX_INFOTIP | GetExtendedStyle());
}

BOOL CListCtrl_InfoTip::OnGetInfoTip(NMHDR* pNMHDR, LRESULT* pResult)
{
    // Will only request tooltip for the label-column
    NMLVGETINFOTIP* pInfoTip = (NMLVGETINFOTIP*)pNMHDR;
    CString tooltip = GetToolTipText(pInfoTip->iItem, pInfoTip->iSubItem);
    if (!tooltip.IsEmpty())
    {
        _tcsncpy(pInfoTip->pszText, static_cast<LPCTSTR>(tooltip), pInfoTip->cchTextMax);
    }
    return FALSE;    // Let parent-dialog get chance
}

BOOL CListCtrl_InfoTip::OnToolNeedText(UINT id, NMHDR* pNMHDR, LRESULT* pResult)
{
...
   // Break tooltip into multiple lines if it contains newlines (\r\n)
   CToolTipCtrl* pToolTip = AfxGetModuleThreadState()->m_pToolTip;
   if (pToolTip)
      pToolTip->SetMaxTipWidth(SHRT_MAX);
...
}

Answer 2

There are two aspects to consider:

1. The size of the window

To activate multilines mode. This instruction is sufficient :

 pToolTip->SetMaxTipWidth(SHRT_MAX);

2. Number of characters to display

For this second point it is necessary to be wary because the size of the field pszText is limited to 80 characters :

typedef struct tagNMTTDISPINFOA {
NMHDR hdr;
LPSTR lpszText;
char szText[80];
...
}

Therefore, even if you change SetMaxTipWidth you will not see any difference. I suggest you to use the lpszText field which has no limit. Below is the code fragment that interests you:

pTTTW->lpszText = T2W (strTipText.GetBuffer (strTipText.GetLength ()));

Where strTipText is the CString that contains the message to show in the pop-up