自动过滤选择的组合框 (转)[@more@]

经过两天的编码，完成了一个自动过滤选择的组合框，具有以下优点：

1。丝毫不妨碍组合框原有的功能2。根据在编辑框里已经输入的单词，从组合框的列表选项过滤出匹配的项，并使用下拉列表显示出来以供用户选择。3。不需要特别的设置。从ViewClassWizardMember Variables里生成一个CComboBox，然后在源里把CComboBox替换成CACComboBox即可；或者让ClassWizard认识CACComboBox(删除MyApp.clw，选ViewClassWizard，按提示重新生成MyApp.clw，绝大多数时候能成功)，从ViewClassWizardMember Variables里直接生成一个CACComboBox。4。你可以经过简单修改使之成为具有其他类似功能(自动填写？？)的组合框。

由于时间仓促，没有写详细的注释。感兴趣的朋友请等几天后向我索要。联系方法：

to:linger0822@163">linger0822@163.net

代码如下：

// File: ACComboBox.h//// Desc: //  根据用户在编辑框里已经输入的单词，从组合框的列表选项过滤出匹配的项，并使用下拉列表显示出来以供用户选择//// Copyright (c) 2001 EagleFly Studio.//// Original Author: Zhengpeng.Lan// Author:// // Create Time: 2001/10/10// Modify Time: 2001/10/11//#if !defined(AFX_ACCOMBOBOX_H__81CBBD04_3955_4076_A688_74D3EA9730D9__INCLUDED_)#define AFX_ACCOMBOBOX_H__81CBBD04_3955_4076_A688_74D3EA9730D9__INCLUDED_

#if _MSC_VER > 1000

#pragma once#endif // _MSC_VER > 1000

#include "afxtempl.h"

// ACComboBox.h : header file

//class CACComboBox;/// CWndForACComboBox windowtypedef struct{  int nid; CString strDepict;}CInfoForACComboBox;

typedef CArray CInfoForACComboBoxArray;

class CWndForACComboBox : public CWnd

{  friend CACComboBox;private:// Construction LPCTSTR lpWndCls;// Constructionpublic: CWndForACComboBox();

// Attributes

public: CComboBox * m_pComboBox; int m_nMaxCount; CInfoForACComboBoxArray m_aInfo; int m_nMousePos; int m_nBeginShow;

 inline void RemoveAll()

 {  m_aInfo.RemoveAll(); CWnd::SetScrollRange(SB_VERT,0,0); } inline void Add(CInfoForACComboBox &info) {  m_aInfo.Add(info); } inline int GetSize() {  return m_aInfo.GetSize(); } inline void ShowList() {  if(IsWindow(GetSafeHwnd())) {  ShowWindow(SW_SHOWNOACTIVATE); } }// Operationspublic:

// Overrs

 // ClassWizard generated virtual function overrides AFX_VIRTUAL(CWndForACComboBox) public: virtual BOOL Create(CComboBox * pWnd); AFX_VIRTUAL

// Implementation

public: virtual ~CWndForACComboBox();

 // Generated message map functions

protected: AFX_MSG(CWndForACComboBox) afx_msg void OnDestroy(); afx_msg void OnPaint(); afx_msg void OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags); afx_msg void OnLButtonUp(UINT nFlags, CPoint point); afx_msg BOOL OnMouseWheel(UINT nFlags, short zDelta, CPoint pt); afx_msg void OnKillFocus(CWnd* pNewWnd); afx_msg void OnMouseMove(UINT nFlags, CPoint point); afx_msg void OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar); AFX_MSG DECLARE_MESSAGE_MAP()};

/// CACComboBox window

class CACComboBox : public CComboBox

{ private: CEdit*  m_pEdit;

// Construction

public: CACComboBox();

// Attributes

public: CWndForACComboBox m_wndList; inline void WindowMove(void) {  if(IsWindow(m_wndList.GetSafeHwnd())) m_wndList.Invalidate(FALSE); }// Operationspublic:  virtual void HandleCompletion();

// Overrides

 // ClassWizard generated virtual function overrides AFX_VIRTUAL(CACComboBox) protected: virtual BOOL OnCommand(WPARAM wParam, LPARAM lParam); virtual void PreSubclassWindow(); AFX_VIRTUAL

// Implementation

public: virtual ~CACComboBox();

 // Generated message map functions

protected: AFX_MSG(CACComboBox) afx_msg void OnKillfocus(); afx_msg void OnSelchange(); AFX_MSG

 DECLARE_MESSAGE_MAP()

};

/

/

AFX_INSERT_LOCATION}}// Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_ACCOMBOBOX_H__81CBBD04_3955_4076_A688_74D3EA9730D9__INCLUDED_)

// File: ACComboBox.cpp//// Desc: //  根据用户在编辑框里已经输入的单词，从组合框的列表选项过滤出匹配的项，并使用下拉列表显示出来以供用户选择//// Copyright (c) 2001 EagleFly Studio.//// Original Author: Zhengpeng.Lan// Author:// // Create Time: 2001/10/10// Modify Time: 2001/10/11//

#include "stdafx.h"

#include "ACComboBox.h"

#ifdef _DE

#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE[] = __FILE__;#endif

/

// CACComboBox

CACComboBox::CACComboBox()

:CComboBox(){  m_pEdit = NULL;}

CACComboBox::~CACComboBox()

{  if(m_pEdit) delete m_pEdit;}

BEGIN_MESSAGE_MAP(CACComboBox, CComboBox) AFX_MSG_MAP(CACComboBox) ON_CONTROL_REFLECT(CBN_KILLFOCUS, OnKillfocus) ON_CONTROL_REFLECT(CBN_SELCHANGE, OnSelchange) AFX_MSG_MAPEND_MESSAGE_MAP()

/

// CACComboBox message handlers/// CWndForACComboBox

CWndForACComboBox::CWndForACComboBox()

:CWnd(){  lpWndCls = AfxRegisterWndClass(0); m_pComboBox = NULL; m_nMaxCount = 8; m_aInfo.SetSize(0,8); m_nMouseP= -1; m_nBeginShow = 0;}

CWndForACComboBox::~CWndForACComboBox()

{

}

BEGIN_MESSAGE_MAP(CWndForACComboBox, CWnd) AFX_MSG_MAP(CWndForACComboBox) ON_WM_DESTROY() ON_WM_PAINT() ON_WM_KEYDOWN() ON_WM_LBUTTONUP() ON_WM_MOUSEWHEEL() ON_WM_KILLFOCUS() ON_WM_MOUSEMOVE() ON_WM_VSCROLL() AFX_MSG_MAPEND_MESSAGE_MAP()

/// CWndForACComboBox message handlers

BOOL CWndForACComboBox::Create(CComboBox * pWnd)

{  ASSERT(pWnd);

 CRect rect;

 CWnd * pParentWnd = pWnd->GetParent();

 pWnd->GetWindowRect(&rect);

// pParentWnd->ScreenToClient(&rect);

 BOOL bRet = CWnd::CreateEx( WS_EX_TOPMOST | WS_EX_TOOLWINDOW,

 lpWndCls, NULL, WS_POPUP | WS_VSCROLL, rect.left, rect.top, rect.Width(), rect.Height(), pParentWnd->GetSafeHwnd(), NULL, NULL);

 if(bRet)

 SetOwner(pParentWnd);

 m_pComboBox = pWnd;

 return bRet;}

void CWndForACComboBox::OnDestroy()

{  CWnd::OnDestroy();  m_aInfo.RemoveAll(); }

void CWndForACComboBox::OnPaint()

{  CRect rect; CFont * pFont; LOGFONT logFont;

 if(m_pComboBox)

 {  ASSERT(::IsWindow(m_pComboBox->GetSafeHwnd()));  CWnd * pParentWnd = m_pComboBox->GetParent(); m_pComboBox->GetWindowRect(&rect); pFont = pParentWnd->GetFont(); ASSERT(pFont); pFont->GetLogFont(&logFont);

 if(logFont.lfHeight < 0) logFont.lfHeight = -logFont.lfHeight;

 if(m_aInfo.GetSize() > m_nMaxCount) {  logFont.lfWidth = m_nMaxCount * logFont.lfHeight; } else {  logFont.lfWidth = m_aInfo.GetSize() * logFont.lfHeight; } if(logFont.lfWidth + rect.bottom > ::GetSystemMetrics(SM_CYSCREEN)) {  rect.bottom = rect.top; rect.top = rect.bottom - logFont.lfWidth - 2; if(rect.top < 0) rect.top = 0; } else {  rect.top = rect.bottom; rect.bottom = rect.top + logFont.lfWidth + 2; } rect.right = rect.left + m_pComboBox->GetDroppedWidth();// pParentWnd->ScreenToClient(&rect); MoveWindow(&rect); if(rect.Height() < m_aInfo.GetSize() * logFont.lfHeight) {  TRACE("%d  %drn",rect.Height(),m_aInfo.GetSize() * logFont.lfHeight); SCROLLINFO info;

 info.cbSize = sizeof(info);

 info.fMask = SIF_PAGE; info.nPage = rect.Height() / logFont.lfHeight; CWnd::SetScrollRange(SB_VERT,0,m_aInfo.GetSize() - 1,FALSE); CWnd::ShowScrollBar(SB_VERT,TRUE); CWnd::SetScrollInfo(SB_VERT,&info); } else {  CWnd::ShowScrollBar(SB_VERT,FALSE); } } CPaintDC dc(this); // device context for painting

 (0,0,rect.Width(),rect.Height(),RGB(255,255,255));

 dc.Rectangle(0,0,rect.Width(),rect.Height()); logFont.lfWidth = 1; dc.(pFont); int m_nBeginShow = CWnd::GetScrollPos(SB_VERT); for(int i=m_nBeginShow;i {  if(i == m_nMousePos) {  dc.SetBkColor(RGB(0,0,128)); dc.FillSolidRect(1,logFont.lfWidth,rect.Width() - 2,logFont.lfHeight,RGB(0,0,128)); dc.SetTextColor(RGB(255,255,255)); } else {  dc.SetBkColor(RGB(255,255,255)); dc.SetTextColor(RGB(0,0,0)); } dc.TextOut(3,logFont.lfWidth,m_aInfo[i].strDepict); logFont.lfWidth += logFont.lfHeight; }}

void CWndForACComboBox::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)

{  // TODO: Add your message handler code here and/or call default  CWnd::OnKeyDown(nChar, nRepCnt, nFlags);}

void CWndForACComboBox::OnLButtonUp(UINT nFlags, CPoint point)

{  CFont * pFont; LOGFONT logFont;

 if(m_pComboBox)

 {  pFont = m_pComboBox->GetParent()->GetFont(); pFont->GetLogFont(&logFont); if(logFont.lfHeight < 0) logFont.lfHeight = -logFont.lfHeight; m_nMousePos = (point.y - 1) / logFont.lfHeight + CWnd::GetScrollPos(SB_VERT); if(m_nMousePos >= 0 && m_nMousePos < m_aInfo.GetSize()) m_pComboBox->SetCurSel(m_aInfo[m_nMousePos].nid); ShowWindow(SW_HIDE); }  CWnd::OnLButtonUp(nFlags, point);}

BOOL CWndForACComboBox::OnMouseWheel(UINT nFlags, short zDelta, CPoint pt)

{  // TODO: Add your message handler code here and/or call default  return CWnd::OnMouseWheel(nFlags, zDelta, pt);}

void CWndForACComboBox::OnKillFocus(CWnd* pNewWnd)

{  CWnd::OnKillFocus(pNewWnd);  if(pNewWnd->GetSafeHwnd() != m_pComboBox->GetSafeHwnd() && pNewWnd->GetSafeHwnd() != GetSafeHwnd() && IsWindow(GetSafeHwnd())) ShowWindow(SW_HIDE);}

void CWndForACComboBox::OnMouseMove(UINT nFlags, CPoint point)

{  CFont * pFont; LOGFONT logFont; ::ShowCursor(TRUE); if(m_pComboBox) {  pFont = m_pComboBox->GetParent()->GetFont(); pFont->GetLogFont(&logFont); if(logFont.lfHeight < 0) logFont.lfHeight = -logFont.lfHeight; logFont.lfWidth = point.y / logFont.lfHeight + CWnd::GetScrollPos(SB_VERT); if(logFont.lfWidth != m_nMousePos) {  m_nMousePos = logFont.lfWidth; Invalidate(); } }  CWnd::OnMouseMove(nFlags, point);}

void CWndForACComboBox::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)

{  if(m_aInfo.GetSize() <= 0) {  CWnd::OnVScroll(nSBCode, nPos, pScrollBar); return ; }

 switch(nSBCode)

 { // case SB_BOTTOM://Scroll to bottom.// case SB_ENDSCROLL://End scroll. case SB_LINEDOWN://Scroll one line down. {  RECT rc; LOGFONT logFont; CFont * pFont;

 GetClientRect(&rc);

 pFont = m_pComboBox->GetParent()->GetFont(); pFont->GetLogFont(&logFont); ASSERT(logFont.lfHeight != 0); if(logFont.lfHeight < 0) logFont.lfHeight = -logFont.lfHeight; rc.left = (rc.bottom - rc.top) / logFont.lfHeight;

 int nPos = GetScrollPos(SB_VERT) + 1;

 if(nPos + rc.left <= m_aInfo.GetSize()) {  SetScrollPos(SB_VERT,nPos); Invalidate(); } } break; case SB_LINEUP://Scroll one line up. {  int nPos = GetScrollPos(SB_VERT) - 1; if(nPos >= 0) {  SetScrollPos(SB_VERT,nPos); Invalidate(); } } break; case SB_PAGEDOWN://Scroll one page down. {  RECT rc; LOGFONT logFont; CFont * pFont;

 GetClientRect(&rc);

 pFont = m_pComboBox->GetParent()->GetFont(); pFont->GetLogFont(&logFont); ASSERT(logFont.lfHeight != 0); if(logFont.lfHeight < 0) logFont.lfHeight = -logFont.lfHeight;

 rc.top = rc.bottom / logFont.lfHeight;

 int nPos = GetScrollPos(SB_VERT); if(nPos < m_aInfo.GetSize() - rc.top) {  nPos += rc.top; if(nPos > m_aInfo.GetSize() - rc.top) nPos = m_aInfo.GetSize() - rc.top; SetScrollPos(SB_VERT,nPos); Invalidate(); } } break; case SB_PAGEUP://Scroll one page up. {  RECT rc; LOGFONT logFont; CFont * pFont;

 GetClientRect(&rc);

 pFont = m_pComboBox->GetParent()->GetFont(); pFont->GetLogFont(&logFont); ASSERT(logFont.lfHeight != 0); if(logFont.lfHeight < 0) logFont.lfHeight = -logFont.lfHeight;

 rc.top = rc.bottom / logFont.lfHeight;

 int nPos = GetScrollPos(SB_VERT); if(nPos > 0) {  nPos -= rc.top; if(nPos < 0) nPos = 0; SetScrollPos(SB_VERT,nPos); Invalidate(); } } break;// case SB_THUMBPOSITION://Scroll to the absolute position. The current position is provided in nPos. case SB_THUMBTRACK://Drag scroll box to specified position. The current position is provided in nPos. {  SetScrollPos(SB_VERT,nPos); Invalidate(); } break;// case SB_TOP://Scroll to top  }  CWnd::OnVScroll(nSBCode, nPos, pScrollBar);}

void CACComboBox::HandleCompletion()

{  // Make sure we can 'talk' to the edit control if( m_pEdit == NULL )   {  m_pEdit = new CEdit(); m_pEdit->SubclassWindow(GetDlgItem(1001)->GetSafeHwnd()); }

 // Save the state of the edit control

 CString text,bestText; CInfoForACComboBox info; int n = GetCount();

 m_wndList.RemoveAll();

 m_pEdit->GetWindowText(text); CPoint ptCaret = m_pEdit->GetCaretPos();

// int start,end;

// m_pEdit->GetSel(start,end);

 // Perfoactual completion

 int bestindex = -1; int bestfrom  = INT_MAX; int from; for ( int x = 0; x < n; x++ ) {  GetLBText(x,info.strDepict); info.nid = x;

 from = info.strDepict.Find(text);

 if(from != -1)

 {  m_wndList.Add(info); if( from != -1 && from < bestfrom ) {  bestindex = x; bestText = info.strDepict; bestfrom = from; } } }

 if ( bestindex != -1)

 {  // Restore the edit control m_pEdit->SetWindowText(bestText); m_pEdit->SetSel(text.GetLength(),bestText.GetLength()); m_pEdit->SetCaretPos(ptCaret); } if(m_wndList.GetSize() != 0) {  m_wndList.ShowList(); m_wndList.Invalidate(); } else {  m_wndList.ShowWindow(SW_HIDE); }}

BOOL CACComboBox::OnCommand(WPARAM wParam, LPARAM lParam)

{  if(HI(wParam) == EN_CHANGE) {  HandleCompletion(); return TRUE; }  return CComboBox::OnCommand(wParam, lParam);}

void CACComboBox::PreSubclassWindow()

{  CComboBox::PreSubclassWindow();

 m_wndList.Create(this);

}

void CACComboBox::OnKillfocus()

{  m_wndList.OnKillFocus(GetFocus());}

void CACComboBox::OnSelchange()

{  m_wndList.ShowWindow(SW_HIDE); }

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