Cannot Display a tooltip for a CNiNumEdit

[GURO]

I have found a general solution for display tooltips with CNiNumEdit. The problem, on my opinion, is relative the Edit control that the class use for I/O.
This control is overlapping the control window and hide the control window to the tooltips manager.
I wrote a workaround to get the CWnd* of the Edit control and the tooltipo works!

NumeditEx.h

--------------------------------------------------------------------------------------------

#pragma once

#include "ninumedit.h"

//////////////////////////////////////////////////////////////////////////////////////////
//	Summary: Enhanced CNiNumEdit. The class provides extra functionality to manage
//	tooltips
//////////////////////////////////////////////////////////////////////////////////////////
class CNiNumEditEx : public NI::CNiNumEdit
{
	DECLARE_DYNAMIC(CNiNumEditEx)

	TCHAR*  m_ptchar;				// tooltip text for windows tooltip notification
	CNiString m_strToolTip;			// tooltip from resources

public:
	CNiNumEditEx();
	virtual ~CNiNumEditEx();

protected:
	virtual void DoDataExchange(CDataExchange* pDX);

public:
	//
	//	Summary: Returns the window pointer of the overlapping CEdit control
	//	Returns: The window pointer of the overlapping CEdit control or NULL if fails
	//		
	CWnd* GetEditWindow();

public:
	afx_msg BOOL OnToolTipNotify(UINT nID, NMHDR* pNMHDR, LRESULT* pResult);
	DECLARE_MESSAGE_MAP()

	DECLARE_EVENTSINK_MAP()
};

 

NumEditEx.cpp

---------------------------------------------------------------------------------------------------------

#include "stdafx.h"

#include "NumEditEx.h"

IMPLEMENT_DYNAMIC( CNiNumEditEx, NI::CNiNumEdit )

BEGIN_MESSAGE_MAP(CNiNumEditEx, NI::CNiNumEdit)
	ON_NOTIFY_EX( TTN_NEEDTEXT, 0, OnToolTipNotify )
END_MESSAGE_MAP()

BEGIN_EVENTSINK_MAP(CNiNumEditEx, NI::CNiNumEdit)
END_EVENTSINK_MAP()

// ***************************************************************************************
CNiNumEditEx::CNiNumEditEx()
{
	m_ptchar = NULL;
}
// ***************************************************************************************
CNiNumEditEx::~CNiNumEditEx()
{
	if( m_ptchar != NULL ) 
		m_strToolTip.ReleaseBuffer();
}
// ***************************************************************************************
void CNiNumEditEx::DoDataExchange(CDataExchange* pDX)
{
	NI::CNiNumEdit::DoDataExchange(pDX);
}
// ***************************************************************************************
CWnd*  CNiNumEditEx::GetEditWindow()
{
	CWnd* wnd =  NULL;
	HWND hWndThisChild = NULL;
	HWND hWndEdit = NULL;
	_TCHAR	szClassName[1024];

	// Go through the child windows
	hWndThisChild = ::GetWindow(GetSafeHwnd(), GW_CHILD);

	while (hWndThisChild) 
	{
		// If we got the class name...
		if (::GetClassName(hWndThisChild, szClassName, 1024))
		{
			// And if class name is same as the one we're looking for...
			if (lstrcmp(szClassName, "Edit") == 0)
			{
				// Bingo
				hWndEdit = hWndThisChild;
				break;
			}
		}

		// Get next child window
		hWndThisChild = ::GetNextWindow(hWndThisChild, GW_HWNDNEXT);
	}

	if( hWndEdit )
	{
		 wnd = CWnd::FromHandle(hWndEdit);
	}
	return wnd;
}
// ***************************************************************************************
BOOL CNiNumEditEx::OnToolTipNotify(UINT  id, NMHDR* pNMHDR, LRESULT* pResult)
{
	TOOLTIPTEXT *pTTT = (TOOLTIPTEXT *)pNMHDR;
 	UINT nID =pNMHDR->idFrom;
	if (pTTT->uFlags & TTF_IDISHWND)
	{
		// idFrom is actually the HWND of the tool
		nID = ::GetDlgCtrlID((HWND)nID);
		if(nID)
		{
			if( m_ptchar == NULL )
			{
				m_strToolTip.LoadString(nID);
				m_ptchar = m_strToolTip.GetBuffer();
			}
			pTTT->lpszText = m_ptchar;
			pTTT->hinst = AfxGetResourceHandle();
			return(TRUE);
		}
	}
	return(FALSE);
}

 

Usage:

	//
	// Gestione dei tooltip
	//
	m_tooltip.Create(this);
	m_tooltip.SetDebugMode(FALSE);
	m_tooltip.SetEffectBk(CPPDrawManager::EFFECT_VGRADIENT);
	m_tooltip.SetIgnoreEnabledStatus(TRUE);

	SUPER_TOOLTIP_INFO sti;
	sti.bSuperTooltip     = TRUE;
	sti.nVirtualKeyCode   = 0;
	sti.nKeyCodeId        = 0;
	sti.nIDTool           = 0;
	sti.nSizeX            = 400;
	sti.bLineAfterHeader  = FALSE;
	sti.strFooter         = "";
	sti.nFooterImage      = 0;
	sti.bLineBeforeFooter = TRUE;
	sti.rgbBegin          = RGB(255, 255, 255);
	sti.rgbMid            = RGB(242, 246, 251);
	sti.rgbEnd            = RGB(202, 218, 239);
	sti.rgbText           = RGB(76, 76, 76);
	sti.nSizeX = 212;
	sti.strHeader = "Indicatore Posizione Asse";
	sti.strBody =  "<indent>Indica la posizione attuale del'asse</indent>.<br>"
		           "<indent>Quando lo sfondo del controllo è giallo l'asse è in movimento,"
				   "a posizione raggiunta lo sfondo è bianco.</indent><br>";

	sti.pWnd = ((CNiNumEditEx*)GetDlgItem(IDC_IND_AXE1))->GetEditWindow();
	m_tooltip.AddTool(&sti);

Let me know if useful.

Have a nice day

Roberto Guerzoni

Tecnologic s.r.l. campogalliano (MO) Italy