Create In-Place ToolTips on yourself control

// ToolTipsView.cpp : implementation of the CToolTipsView class
//
/////////////////////////////////////////////////////////////////////////////
/*  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

 * Copyright (C) 2003-2007 Auto Debug System http://www.autodebug.com.
 */
 
#include "stdafx.h"
#include "resource.h"

#include "ToolTipsView.h"

BOOL CToolTipsView::PreTranslateMessage(MSG* pMsg)
{
	pMsg;
	return FALSE;
}

LRESULT CToolTipsView::OnPaint(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
{
	CPaintDC dc(m_hWnd);

	//TODO: Add your drawing code here
	HFONT pOldFont = (HFONT)dc.SelectFont(m_font);
	CDemoItemList::iterator it;

	CDemoItem* pItem = NULL;
	for(it = m_items.begin(); it != m_items.end(); it++)
	{
		pItem = (*it);
		dc.TextOut(pItem->m_x, pItem->m_y, pItem->m_str);
	}	
	return 0;
}

CDemoItem* CToolTipsView::AddItem(int x, int y, LPCTSTR pszText)
{
	CDemoItem* pItem = new CDemoItem();
	pItem->m_x = x;
	pItem->m_y = y;
	pItem->m_str = pszText;
	
	m_items.push_back(pItem);
	
	HDC pDC = GetDC();
	HFONT pOldFont = (HFONT)SelectObject(pDC, m_font);
	CSize sz;
	GetTextExtentPoint32(pDC, pItem->m_str, pItem->m_str.GetLength(), &sz);
	SetRect(&pItem->m_rect, x, y, x+sz.cx, y+sz.cy);
	SelectObject(pDC, pOldFont);
	return pItem;	
}

CDemoItem* CToolTipsView::GetItemAtPt(POINT pt)
{
	CDemoItemList::iterator it;
	CDemoItem* pItem = NULL;
	for(it = m_items.begin(); it != m_items.end(); it++)
	{
		pItem = (*it);
		if(PtInRect(&pItem->m_rect, pt))
			return pItem;
	}	
	return NULL;

}

void CToolTipsView::GetItemRect(CDemoItem *pItem, RECT *pRect)
{
	SetRect(pRect, pItem->m_rect.left, pItem->m_rect.top, pItem->m_rect.right, pItem->m_rect.bottom);
}

LRESULT CToolTipsView::OnMouseLeave(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
{
	m_toolTip.TrackActivate(&m_ti, FALSE);
	return 0;
}

LRESULT CToolTipsView::OnMouseMove(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM lParam, BOOL& /*bHandled*/)
{
	POINT pt;
	
	pt.x = GET_X_LPARAM(lParam);
	pt.y = GET_Y_LPARAM(lParam);
	TRACKMOUSEEVENT tk;
	
	CDemoItem* pItem = GetItemAtPt(pt);
	if(pItem == NULL)
	{
		m_toolTip.TrackActivate(&m_ti, FALSE);
		return 0;
	}
	RECT rect;
	GetItemRect(pItem, &rect);
	pt.x = rect.left - 3;
	pt.y = rect.top - 2;
	tk.cbSize = sizeof(tk);
	tk.dwFlags = TME_LEAVE;//|TME_HOVER|TME_CANCEL;
	tk.dwHoverTime = 0;
	tk.hwndTrack = m_hWnd;
	_TrackMouseEvent(&tk);
	ClientToScreen(&pt);
	m_toolTip.TrackPosition(pt.x, pt.y);
	m_toolTip.TrackActivate(&m_ti, TRUE);
	return 0;
}

LRESULT CToolTipsView::OnNeedTextNotify(int /*idCtrl*/, LPNMHDR pnmh, BOOL& /*bHandled*/)
{
	LPNMTTDISPINFO pInfo = (LPNMTTDISPINFO)pnmh;
	POINT pt;
	GetCursorPos(&pt);
	ScreenToClient(&pt);
	CDemoItem* pItem = GetItemAtPt(pt);
	if(pItem)
		pInfo->lpszText = (LPTSTR)(LPCTSTR)pItem->m_str;
	return 0;
}

LRESULT CToolTipsView::OnCreate(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
{
	m_font = (HFONT)GetStockObject(DEFAULT_GUI_FONT);
	
	m_toolTip.Create(m_hWnd);
	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.AddTool(&m_ti);
	return 0;
}