CButton Tooltips dont popup intermittently

VS2005 C++ (v8.0.50727.867), WinXP SP2

I have a standard MFC CDialog with some CButtons. The CButtons are using CToolTipCtrl to display a popup tooltip box.

When my Program starts up, all the tooltips work fine.

When I click a Button, the Tooltip never pops up anymore.


Is there bug in CToolTipCtrl?

This happens in two of my MFC programs that use CToolTips differently. One of the programs is using the CButtonST class by Davide Calabro, the other Program is using the ToolTipButton class made by ?? (downloaded from codeguru or Codeproject) which is basically a class that adds tooltips to CButton.
It happens with Static buttons, and buttons created on the fly.


Here is the code from BtnST.cpp

Code:

---

void CButtonST::InitToolTip()
{
        if (m_ToolTip.m_hWnd == NULL)
        {
                // Create ToolTip control
                m_ToolTip.Create(this, m_dwToolTipStyle);
                // Create inactive
                m_ToolTip.Activate(FALSE);
                // Enable multiline
                m_ToolTip.SendMessage(TTM_SETMAXTIPWIDTH, 0, 400);
                //m_ToolTip.SendMessage(TTM_SETTITLE, TTI_INFO, (LPARAM)_T("Title"));
        } // if
}

void CButtonST::SetTooltipText(int nText, BOOL bActivate)
{
        CString sText;

        // Load string resource
        sText.LoadString(nText);
        // If string resource is not empty
        if (sText.IsEmpty() == FALSE) SetTooltipText((LPCTSTR)sText, bActivate);
}

void CButtonST::SetTooltipText(LPCTSTR lpszText, BOOL bActivate)
{
        // We cannot accept NULL pointer
        if (lpszText == NULL) return;

        // Initialize ToolTip
        InitToolTip();

        // If there is no tooltip defined then add it
        if (m_ToolTip.GetToolCount() == 0)
        {
                CRect rectBtn;
                GetClientRect(rectBtn);
                m_ToolTip.AddTool(this, lpszText, rectBtn, 1);
        } // if

        // Set text for tooltip
        m_ToolTip.UpdateTipText(lpszText, this, 1);
        m_ToolTip.Activate(bActivate);
}

void CButtonST::ActivateTooltip(BOOL bActivate)
{
        // If there is no tooltip then do nothing
        if (m_ToolTip.GetToolCount() == 0) return;

        // Activate tooltip
        m_ToolTip.Activate(bActivate);
}

BOOL CButtonST::PreTranslateMessage(MSG* pMsg)
{
        InitToolTip();
        m_ToolTip.RelayEvent(pMsg);
       
        if (pMsg->message == WM_LBUTTONDBLCLK)
                pMsg->message = WM_LBUTTONDOWN;

        return CButton::PreTranslateMessage(pMsg);
}

---

If you can post a sample project I can help you, I had similar problems with my custom irregular shaped rollover button tooltips, sometimes after clicking the buttons CToolTipCtrl doesnt receive the proper MouseMove message after the buttonup even has been fired. I can't really tell if that's the case for you but if you post a sample project ( attach ) I can probably fix it.

ok thanks kilkoo.

I created a sample app but the tooltips work every time now (its always the case lol).

Please check this thread tomorrow, I'll see if I can replicate it again then post the attachment

I tried replicating it in a test app but I couldnt get it working. My main app is too large.

I found that:

If you push a button but drag the cursor away from the button (without lifting up the mouse button), the tooltip still fails.
When the tooltip doesnt work, the Button is still receiving WM_MOUSEMOVE messages in PreTranslateMessages
When the tooltip doesnt work, the CToolTip pointer is still valid
When the tooltip doesnt work, m_ToolTip.GetToolCount() is above 0

Workaround Fix:
If I call CButton->m_ToolTip.UpdateTipText(lpszText, this, 1) from CDialog::OnCommand when the mouse button is clicked, the tooltip comes back.

This was exactly my problem, when u click the left button hold it move the mouse away from the button the tooltip wont receive the WM_MOUSEMOVE message. The way i worked around it was in the LeftButtonUp handler i just sent a notification to my tooltip ( if i had one ) that the mouse has moved:

Code:

---

                        UINT lParam=0;
                        lParam|=point.y<<16;
                        lParam|=(WORD)point.x;
                        m_ToolTip.SendMessage(WM_MOUSEMOVE,0,lParam);

---

Interesting, I'll keep that in mind. Thanks :)