三、程序代码

///////////////////////////////////////////////////////
#if !defined(FLATCOMBOBOX_H_INCLUDED)
#define FLATCOMBOBOX_H_INCLUDED
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#define FC_DRAWNORMAL 0x00000001
#define FC_DRAWRAISED 0x00000002
#define FC_DRAWPRESSD 0x00000004

// CFlatComboBox window
class CFlatComboBox : public CComboBox
{
　// Construction
　public:
　　CFlatComboBox();
　　// Attributes
　public:
　　bool m_bLBtnDown;
　　COLORREF m_clrHilite;
　　COLORREF m_clrShadow;
　　COLORREF m_clrDkShad;
　　COLORREF m_clrButton;
　　// Operations
　public:
　　void DrawCombo(DWORD dwStyle, COLORREF clrTopLeft, COLORREF clrBottomRight);
　　int Offset();
　　// Overrides
　　// ClassWizard generated virtual function overrides
　　//{{AFX_VIRTUAL(CFlatComboBox)
　　//}}AFX_VIRTUAL
　　// Implementation
　public:
　　virtual ~CFlatComboBox();
　　// Generated message map functions
　protected:
　　//{{AFX_MSG(CFlatComboBox)
　　　afx_msg void OnMouseMove(UINT nFlags, CPoint point);
　　　afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
　　　afx_msg void OnLButtonUp(UINT nFlags, CPoint point);
　　　afx_msg void OnTimer(UINT nIDEvent);
　　　afx_msg void OnPaint();
　　//}}AFX_MSG
　　DECLARE_MESSAGE_MAP()
};
#endif // !defined(FLATCOMBOBOX_H_INCLUDED)

///////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "FlatComboBox.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

///////////////////////////////// CFlatComboBox

CFlatComboBox::CFlatComboBox()
{
　m_bLBtnDown = false;
}

CFlatComboBox::~CFlatComboBox()
{}

BEGIN_MESSAGE_MAP(CFlatComboBox, CComboBox)
　//{{AFX_MSG_MAP(CFlatComboBox)
　　ON_WM_MOUSEMOVE()
　　ON_WM_LBUTTONDOWN()
　　ON_WM_LBUTTONUP()
　　ON_WM_TIMER()
　　ON_WM_PAINT()
　//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////
CFlatComboBox message handlers
void CFlatComboBox::OnMouseMove(UINT nFlags, CPoint point)
{
　SetTimer(1,10,NULL);
　CComboBox::OnMouseMove(nFlags, point);
}

void CFlatComboBox::OnLButtonDown(UINT nFlags, CPoint point)
{
　m_bLBtnDown = true;
　CComboBox::OnLButtonDown(nFlags, point);
}

void CFlatComboBox::OnLButtonUp(UINT nFlags, CPoint point)
{
　m_bLBtnDown = false;
　Invalidate();
　CComboBox::OnLButtonUp(nFlags, point);
}

void CFlatComboBox::OnTimer(UINT nIDEvent)
{
　POINT pt;
　GetCursorPos(&pt);
　CRect rcItem;
　GetWindowRect(&rcItem);
　static bool bPainted = false;
　// OnLButtonDown, show pressed.
　if (m_bLBtnDown==true) {
　　KillTimer (1);
　　if (bPainted == true) {
　　　DrawCombo(FC_DRAWPRESSD, ::GetSysColor(COLOR_BTNSHADOW),::GetSysColor(COLOR_BTNHIGHLIGHT));
　　　bPainted = false;
　　}
　　return;
　}
　// If mouse leaves, show flat.
　if (!rcItem.PtInRect(pt)) {
　　KillTimer (1);
　　if (bPainted == true) {
　　　DrawCombo(FC_DRAWNORMAL, ::GetSysColor(COLOR_BTNFACE),::GetSysColor(COLOR_BTNFACE));
　　　bPainted = false;
　　}
　　return;
　}
　// On mouse over, show raised.
　else {
　　if (bPainted == true)
　　　return;
　　else {
　　　bPainted = true;
　　　DrawCombo(FC_DRAWRAISED, ::GetSysColor(COLOR_BTNSHADOW),::GetSysColor(COLOR_BTNHIGHLIGHT));
　　}
　}
　CComboBox::OnTimer(nIDEvent);
}

void CFlatComboBox::OnPaint()
{
　Default();
　DrawCombo(FC_DRAWNORMAL, ::GetSysColor(COLOR_BTNFACE),::GetSysColor(COLOR_BTNFACE));
}

void CFlatComboBox::DrawCombo(DWORD dwStyle, COLORREF clrTopLeft, COLORREF clrBottomRight)
{
　CRect rcItem;
　GetClientRect(&rcItem);
　CDC* pDC = GetDC();
　// Cover up dark 3D shadow.
　pDC->Draw3dRect(rcItem, clrTopLeft, clrBottomRight);
　rcItem.DeflateRect(1,1);
　if (!IsWindowEnabled()) {
　　pDC->Draw3dRect(rcItem, ::GetSysColor(COLOR_BTNHIGHLIGHT),::GetSysColor(COLOR_BTNHIGHLIGHT));
　}
　else {
　　pDC->Draw3dRect(rcItem, ::GetSysColor(COLOR_BTNFACE),::GetSysColor(COLOR_BTNFACE));
　}
　// Cover up dark 3D shadow on drop arrow.
　rcItem.DeflateRect(1,1);
　rcItem.left = rcItem.right-Offset();
　pDC->Draw3dRect(rcItem, ::GetSysColor(COLOR_BTNFACE),::GetSysColor(COLOR_BTNFACE));
　// Cover up normal 3D shadow on drop arrow.
　rcItem.DeflateRect(1,1);
　pDC->Draw3dRect(rcItem, ::GetSysColor(COLOR_BTNFACE),::GetSysColor(COLOR_BTNFACE));
　if (!IsWindowEnabled()) {
　　return;
　}
　switch (dwStyle)
　{
　　case FC_DRAWNORMAL:
　　　rcItem.top -= 1;
　　　rcItem.bottom += 1;
　　　pDC->Draw3dRect(rcItem, ::GetSysColor(COLOR_BTNHIGHLIGHT),::GetSysColor(COLOR_BTNHIGHLIGHT));
　　　rcItem.left -= 1;
　　　pDC->Draw3dRect(rcItem, ::GetSysColor(COLOR_BTNHIGHLIGHT),::GetSysColor(COLOR_BTNHIGHLIGHT));
　　　break;
　　case FC_DRAWRAISED:
　　　rcItem.top -= 1;
　　　rcItem.bottom += 1;
　　　pDC->Draw3dRect(rcItem, ::GetSysColor(COLOR_BTNHIGHLIGHT),::GetSysColor(COLOR_BTNSHADOW));
　　　break;
　　case FC_DRAWPRESSD:
　　　rcItem.top -= 1;
　　　rcItem.bottom += 1;
　　　rcItem.OffsetRect(1,1);
　　　pDC->Draw3dRect(rcItem, ::GetSysColor(COLOR_BTNSHADOW),::GetSysColor(COLOR_BTNHIGHLIGHT));
　　　break;
　}
　ReleaseDC(pDC);
}

int CFlatComboBox::Offset()
{
　// Thanks to Todd Brannam for this suggestion...
　return ::GetSystemMetrics(SM_CXHTHUMB);
}

/////////////////// MainToolBar.h: interface for the CMainToolBar class.

#if !defined(AFX_MAINTOOLBAR_H__76CF28F4_005F_11D7_8F58_00E04C0BECE6__INCLUDED_)
#define AFX_MAINTOOLBAR_H__76CF28F4_005F_11D7_8F58_00E04C0BECE6__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#include "FlatComboBox.h"

class CMainToolBar : public CToolBar
{
　public:
　　CMainToolBar();
　　virtual ~CMainToolBar();
　public:
　　CFlatComboBox m_wndZoom;
};
#endif

////////////////////////////// MainToolBar.cpp: implementation of the CMainToolBar class.
#include "stdafx.h"
#include "ToolBar.h"
#include "MainToolBar.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

CMainToolBar::CMainToolBar()
{}

CMainToolBar::~CMainToolBar()
{}

//////////////////////////////////////////////////////////////////////////////////////////////
int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
　if (CFrameWnd::OnCreate(lpCreateStruct) == -1)
　　return -1;
　if (!m_wndToolBar.CreateEx(this, TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE |
　　　CBRS_TOP| CBRS_GRIPPER | CBRS_TOOLTIPS | CBRS_FLYBY |
　　　CBRS_SIZE_DYNAMIC) ||!m_wndToolBar.LoadToolBar(IDR_MAINFRAME))
　{
　　TRACE0("Failed to create toolbar\n");
　　return -1; // fail to create
　}
　if (!m_wndStatusBar.Create(this) || !m_wndStatusBar.SetIndicators(indicators,
sizeof(indicators)/sizeof(UINT)))
　{
　　TRACE0("Failed to create status bar\n");
　　return -1; // fail to create
　}
　// TODO: Delete these three lines if you don’t want the toolbar to be dockable
　m_wndToolBar.EnableDocking(CBRS_ALIGN_ANY);
　EnableDocking(CBRS_ALIGN_ANY);
　DockControlBar(&m_wndToolBar);
　int index = 0;
　RECT rect;
　//找到指定的工具项
　while(m_wndToolBar.GetItemID(index)!=ID_TOOL_ZOOM)index++;
　//设置指定工具项的宽度并获取新的区域 80是宽度
　m_wndToolBar.SetButtonInfo(index, ID_TOOL_ZOOM, TBBS_SEPARATOR, 80);
　m_wndToolBar.GetItemRect(index, &rect);
　//设置位置
　rect.top+=2;
　rect.bottom += 200;
　// 创建并显示
　if (!m_wndToolBar.m_wndZoom.Create(WS_CHILD|WS_VISIBLE |CBS_AUTOHSCROLL|CBS_DROPDOWNLIST |
CBS_HASSTRINGS ,rect, &m_wndToolBar, ID_TOOL_ZOOM))
　{
　　TRACE0("Failed to create combo-box\n");
　　return FALSE;
　}
　m_wndToolBar.m_wndZoom.ShowWindow(SW_SHOW);
　//填充内容
　m_wndToolBar.m_wndZoom.AddString("25%");
　m_wndToolBar.m_wndZoom.AddString("50%");
　m_wndToolBar.m_wndZoom.AddString("75%");
　m_wndToolBar.m_wndZoom.AddString("100%");
　m_wndToolBar.m_wndZoom.AddString("125%");
　m_wndToolBar.m_wndZoom.AddString("150%");
　m_wndToolBar.m_wndZoom.AddString("175%");
　m_wndToolBar.m_wndZoom.AddString("200%");
　m_wndToolBar.m_wndZoom.SetCurSel(3);
　return 0;
}

void CMainFrame::OnSelectZoomed()
{
　CString strContent;
　m_wndToolBar.m_wndZoom.GetWindowText(strContent);
　AfxMessageBox(strContent);
}

四、小结

　　为了实现OFFICE2000风格的工具条，本实例介了一种比较巧妙的方法，利用Visual C++6.0已有的开发环境支持，在工具条中加入了平面组合框控件，并实现了组合框的消息响应，用户选择组合框中的某一项后，会弹出一个对话框，提示用户所选择的信息。