Create In-Place ToolTips on yourself control

• Download demo project - 7.5 KB
• Download source files - 15.0 KB
• Download WTL Version source files - 15.4 KB

Introduction

It is very easy to create In-Place ToolTips on yourself control like treeview control.

Using the code

Step 1

In the window's header file you must add a CToolTipCtrl instance and TOOLINFO member, and add message map to handle the mouse messages.

protected:
     afx_msg void OnMouseMove(UINT nFlags, CPoint point);
     afx_msg void OnMouseLeave(WPARAM wPawam, LPARAM lParam);
     //}}AFX_MSG

    DECLARE_MESSAGE_MAP()
private:
     CToolTipCtrl m_toolTip;
     TOOLINFO m_ti;

Step 2

In window's implementation file add the following to the end of Createto set the tooltips.

m_toolTip.Create(this);
m_ti.cbSize = sizeof(m_ti);
m_ti.uFlags = TTF_IDISHWND|TTF_TRACK|TTF_ABSOLUTE |TTF_TRANSPARENT ;
m_ti.hwnd = m_hWnd;
m_ti.hinst = NULL;
m_ti.uId = (UINT)m_hWnd;
m_ti.lpszText = LPSTR_TEXTCALLBACK;
m_ti.rect.left = 0; 
m_ti.rect.top = 0;
m_ti.rect.right = 0;
m_ti.rect.bottom = 0;

m_toolTip.SendMessage(TTM_ADDTOOL, 0, (LPARAM)&m_ti);

At the bottom of the message map add the following:

    ON_WM_MOUSEMOVE()
    ON_MESSAGE(WM_MOUSELEAVE, OnMouseLeave)
END_MESSAGE_MAP()

Finally add the message handler method as entered in the message map:

void CChildView::OnMouseMove(UINT nFlags, CPoint point) 
{
     CDemoItem* pItem = GetItemAtPt(point);
     if(pItem == NULL)
     {
          m_toolTip.SendMessage(TTM_TRACKACTIVATE, FALSE, (LPARAM)&m_ti);
          return; 
     }
     RECT rect;
     GetItemRect(pItem, &rect);
     POINT pt;
      
     TRACKMOUSEEVENT tk;
     tk.cbSize = sizeof(tk);
     tk.dwFlags = TME_LEAVE;
     tk.dwHoverTime = 0;
     tk.hwndTrack = m_hWnd;
     _TrackMouseEvent(&tk);
     pt.x = rect.left - 3;
     pt.y = rect.top - 2;
     ClientToScreen(&pt);
     m_toolTip.SendMessage(TTM_TRACKPOSITION, 0, (LPARAM)MAKELPARAM(pt.x, pt.y));
     m_toolTip.SendMessage(TTM_TRACKACTIVATE, TRUE, (LPARAM)&m_ti);
}

void CChildView::OnMouseLeave(WPARAM wPawam, LPARAM lParam)
{
     m_toolTip.SendMessage(TTM_TRACKACTIVATE, FALSE, (LPARAM)&m_ti);
}

 

Contacting the Author

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History

2007-3-23: Add WTL version source files