www.pudn.com > smtpemail.zip > ComboCompletion.cpp

// ComboCompletion.cpp : implementation file 
// 
// Autocompleting combo-box (like the URL edit box in netscape) 
// 
// Written by Chris Maunder (cmaunder@mail.com) 
// Copyright (c) 1998. 
// 
// This code may be used in compiled form in any way you desire. This 
// file may be redistributed unmodified by any means PROVIDING it is  
// not sold for profit without the authors written consent, and  
// providing that this notice and the authors name is included. If  
// the source code in  this file is used in any commercial application  
// then acknowledgement must be made to the author of this file  
// (in whatever form you wish). 
// 
// This file is provided "as is" with no expressed or implied warranty. 
// 
// Expect bugs. 
//  
// Please use and enjoy. Please let me know of any bugs/mods/improvements  
// that you have found/implemented and I will fix/incorporate them into this 
// file.  
// 
// Modified: 12 Sep 1998 Setting correct cursor position after  
//                       auto-complete: Petr Stejskal and Ryan Schneider 
// 
///////////////////////////////////////////////////////////////////////////// 
 
#include "stdafx.h" 
#include "ComboCompletion.h" 
 
#ifdef _DEBUG 
#define new DEBUG_NEW 
#undef THIS_FILE 
static char THIS_FILE[] = __FILE__; 
#endif 
 
///////////////////////////////////////////////////////////////////////////// 
// CComboCompletion 
 
CComboCompletion::CComboCompletion() 
{ 
	m_bAutoComplete = TRUE; 
} 
 
CComboCompletion::~CComboCompletion() 
{ 
} 
 
 
BEGIN_MESSAGE_MAP(CComboCompletion, CComboBox) 
	//{{AFX_MSG_MAP(CComboCompletion) 
	ON_CONTROL_REFLECT(CBN_EDITUPDATE, OnEditUpdate) 
	//}}AFX_MSG_MAP 
END_MESSAGE_MAP() 
 
///////////////////////////////////////////////////////////////////////////// 
// CComboCompletion message handlers 
 
BOOL CComboCompletion::PreTranslateMessage(MSG* pMsg) 
{ 
	// Need to check for backspace/delete. These will modify the text in 
	// the edit box, causing the auto complete to just add back the text 
	// the user has just tried to delete.  
 
	if (pMsg->message == WM_KEYDOWN) 
	{ 
		m_bAutoComplete = TRUE; 
 
		int nVirtKey = (int) pMsg->wParam; 
		if (nVirtKey == VK_DELETE || nVirtKey == VK_BACK) 
			m_bAutoComplete = FALSE; 
	} 
 
	return CComboBox::PreTranslateMessage(pMsg); 
} 
 
void CComboCompletion::OnEditUpdate()  
{ 
  // if we are not to auto update the text, get outta here 
  if (!m_bAutoComplete)  
      return; 
 
  // Get the text in the edit box 
  CString str; 
  GetWindowText(str); 
  int nLength = str.GetLength(); 
   
  // Currently selected range 
  DWORD dwCurSel = GetEditSel(); 
  WORD dStart = LOWORD(dwCurSel); 
  WORD dEnd   = HIWORD(dwCurSel); 
 
  // Search for, and select in, and string in the combo box that is prefixed 
  // by the text in the edit box 
  if (SelectString(-1, str) == CB_ERR) 
  { 
      SetWindowText(str);		// No text selected, so restore what was there before 
      if (dwCurSel != CB_ERR) 
        SetEditSel(dStart, dEnd);	//restore cursor postion 
  } 
 
  // Set the text selection as the additional text that we have added 
  if (dEnd < nLength && dwCurSel != CB_ERR) 
      SetEditSel(dStart, dEnd); 
  else 
      SetEditSel(nLength, -1); 
}