从CWnd派生出自己的搜索框控件

#if !defined(AFX_SEARCHBOX_H__4AAEB096_F117_4139_8F63_94C9E64041E5__INCLUDED_)
#define AFX_SEARCHBOX_H__4AAEB096_F117_4139_8F63_94C9E64041E5__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// MySearchBox.h : header file
//

/////////////////////////////////////////////////////////////////////////////
// CMySearchBox window
#define UM_BEGINSEARCH WM_USER + 1
class CMySearchBox : public CWnd
{
// Construction
public:
    CMySearchBox();

// Attributes
public:

// Operations
public:

// Overrides
    // ClassWizard generated virtual function overrides
    //{{AFX_VIRTUAL(CMySearchBox)
    protected:
    //}}AFX_VIRTUAL

// Implementation
public:
    void GetSearchText(CString& strSearch)
    {
        m_pEdit.GetWindowText(strSearch);
    }
    BOOL Create(DWORD dwStyle, const RECT& rcLayout, CWnd* pParentWnd, UINT nID);
    virtual ~CMySearchBox();

    // Generated message map functions
protected:
    //{{AFX_MSG(CMySearchBox)
    afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
    afx_msg void OnSize(UINT nType, int cx, int cy);
    afx_msg void OnButtonClick();
    afx_msg void OnNcPaint();
    //}}AFX_MSG

    DECLARE_MESSAGE_MAP()
private:
    CEdit m_pEdit;
    CButton m_pBtn;
};

/////////////////////////////////////////////////////////////////////////////

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

#endif // !defined(AFX_SEARCHBOX_H__4AAEB096_F117_4139_8F63_94C9E64041E5__INCLUDED_)

// MySearchBox.cpp : implementation file
//

#include "stdafx.h"
#include "MySearchBox.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

#define IDC_EDIT 1
#define IDC_BTN    2

/////////////////////////////////////////////////////////////////////////////
// CMySearchBox

CMySearchBox::CMySearchBox()
{
}

CMySearchBox::~CMySearchBox()
{
}


BEGIN_MESSAGE_MAP(CMySearchBox, CWnd)
    //{{AFX_MSG_MAP(CMySearchBox)
    ON_WM_CREATE()
    ON_WM_SIZE()
    ON_BN_CLICKED(IDC_BTN, OnButtonClick)
    ON_WM_NCPAINT()
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMySearchBox message handlers

int CMySearchBox::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
    if (CWnd::OnCreate(lpCreateStruct) == -1)
        return -1;
    
    // TODO: Add your specialized creation code here
    m_pEdit.Create(WS_CHILD | WS_VISIBLE | ES_AUTOHSCROLL, CRect(0, 0, 0, 0),this, IDC_EDIT);
    m_pBtn.Create(_T("S"),WS_CHILD | WS_VISIBLE, CRect(0, 0, 0, 0),this,    IDC_BTN);
    

    //设置字体
    HFONT hFont = (HFONT)GetStockObject(DEFAULT_GUI_FONT);
    CFont* pFont = CFont::FromHandle(hFont);
    m_pEdit.SetFont(pFont);
    m_pBtn.SetFont(pFont);

    LOGFONT lf;
    pFont->GetLogFont(&lf);
    return 0;
}

void CMySearchBox::OnSize(UINT nType, int cx, int cy) 
{
    CWnd::OnSize(nType, cx, cy);
    
    //调整两控件大小
    int nBtnWidth = 30;
    m_pEdit.MoveWindow(5,(cy-12)/2,cx-nBtnWidth-10,12);
    m_pBtn.MoveWindow(cx - nBtnWidth, 1, nBtnWidth, cy - 2);
}

void CMySearchBox::OnNcPaint()
{
    CPaintDC dc(this);
    CRect rcWnd;
    GetWindowRect(&rcWnd);
    rcWnd.SetRect(0, 0, rcWnd.Width(), rcWnd.Height());

    dc.SelectStockObject(BLACK_PEN);
    dc.SelectStockObject(WHITE_BRUSH);
    dc.Rectangle(&rcWnd);
}

//////////////////////////////////////////////////////////////////////////
//处理搜索按钮
void CMySearchBox::OnButtonClick() 
{
    // TODO: Add your message handler code here and/or call default
    ::SendMessage(::GetParent(m_hWnd), UM_BEGINSEARCH, 0, 0);
}

//////////////////////////////////////////////////////////////////////////
//外部调用
//////////////////////////////////////////////////////////////////////////
BOOL CMySearchBox::Create(DWORD dwStyle, const RECT &rcLayout,
                           CWnd *pParentWnd, UINT nID)
{
    int nRight = rcLayout.right;
    if(nRight - rcLayout.left < 24)
        nRight = rcLayout.left + 28;

    CRect rect(rcLayout.left,rcLayout.top,nRight,rcLayout.bottom);

    WNDCLASS wndcls;    
    memset(&wndcls, 0, sizeof(WNDCLASS));   // start with NULL
    // defaults    
    wndcls.style = CS_DBLCLKS | CS_HREDRAW | CS_VREDRAW | CS_NOCLOSE;    
    //you can specify your own window procedure
    wndcls.lpfnWndProc = ::DefWindowProc; 
    wndcls.hInstance = AfxGetInstanceHandle();
    wndcls.hIcon =  NULL; // or load a different icon
    wndcls.hCursor =NULL;
    wndcls.hbrBackground = (HBRUSH)GetStockObject(NULL_BRUSH);//(HBRUSH) (COLOR_WINDOW + 1);
    wndcls.lpszMenuName = NULL;
    
    // Specify your own class name for using FindWindow later
    wndcls.lpszClassName = _T("likebeta_SearchBox");
    
    LPCTSTR lpszClassName = _T("likebeta_SearchBox");
    // Register the new class and exit if it fails
    if(!AfxRegisterClass(&wndcls))
    {
        lpszClassName= AfxRegisterWndClass(0);
    }    
    return CWnd::Create(lpszClassName,     _T("likebeta_SearchBox"),dwStyle, rect,    pParentWnd,    nID, NULL);
}

查考: www.cguage.com/2011/03/search-box.html