?? comboboxex.cpp
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// ComboBoxEx.cpp : implementation file
//
// Autocompleting combo-box (like the URL edit box in netscape)
//
// Written by Chris Maunder (Chris.Maunder@cbr.clw.csiro.au)
// 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.
// The author accepts no liability if it causes any damage to your
// computer, causes your pet cat to fall ill, increases baldness or
// makes you car start emitting strange noises when you start it up.
//
// 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
//
// 本代碼供免費(fèi)使用,使用時(shí)請(qǐng)遵守如上協(xié)定
/////////////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "ComboBoxEx.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// CComboBoxExt
CComboBoxExt::CComboBoxExt()
{
m_bAutoComplete = TRUE;
}
CComboBoxExt::~CComboBoxExt()
{
}
BEGIN_MESSAGE_MAP(CComboBoxExt, CComboBox)
//{{AFX_MSG_MAP(CComboBoxExt)
ON_CONTROL_REFLECT(CBN_EDITUPDATE, OnEditUpdate)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CComboBoxExt message handlers
BOOL CComboBoxExt::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 CComboBoxExt::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);
}
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