本文作者：无幻
测试环境：Windows XP
开发环境：Visual Studio 2010

      要改变CMFCRibbonBar的高度，需要重载CalcFixedLayout函数，例如如下：

头文件：

#pragma once//
// CKofMFCRibbonQuickAccessToolBarclass CKofMFCRibbonQuickAccessToolBar : public CMFCRibbonQuickAccessToolBar
{friend class CKofMFCRibbonBar;
};//
// CKofMFCRibbonBarclass CKofMFCRibbonBar : public CMFCRibbonBar
{DECLARE_DYNAMIC(CKofMFCRibbonBar)public:CKofMFCRibbonBar(BOOL bReplaceFrameCaption = TRUE);virtual ~CKofMFCRibbonBar();protected:virtual CSize CalcFixedLayout(BOOL bStretch, BOOL bHorz);DECLARE_MESSAGE_MAP()
};

实现文件：

#include "stdafx.h"
#include "KofMFCRibbonBar.h"static const int nXTabMargin = 14;
static const int nYTabMargin = 5;static const int nXMargin = 2;
static const int nYMargin = 2;
//
// CKofMFCRibbonBarIMPLEMENT_DYNAMIC(CKofMFCRibbonBar, CMFCRibbonBar)CKofMFCRibbonBar::CKofMFCRibbonBar(BOOL bReplaceFrameCaption /*= TRUE*/)
: CMFCRibbonBar(bReplaceFrameCaption)
{
}CKofMFCRibbonBar::~CKofMFCRibbonBar()
{
}BEGIN_MESSAGE_MAP(CKofMFCRibbonBar, CMFCRibbonBar)
END_MESSAGE_MAP()CSize CKofMFCRibbonBar::CalcFixedLayout( BOOL bStretch, BOOL bHorz )
{ASSERT_VALID(this);CClientDC dc(this);CFont* pOldFont = dc.SelectObject(GetFont());ENSURE(pOldFont != NULL);TEXTMETRIC tm;dc.GetTextMetrics(&tm);//“标题”的高度m_nCaptionHeight = 0;if (m_bReplaceFrameCaption){m_nCaptionHeight = GetSystemMetrics(SM_CYCAPTION) + 1;if (afxGlobalData.DwmIsCompositionEnabled()){m_nCaptionHeight += GetSystemMetrics(SM_CYSIZEFRAME);}}int cy = 0;CSize sizeMainButton = m_sizeMainButton;double scale = afxGlobalData.GetRibbonImageScale();if (scale > 1.){sizeMainButton.cx = (int)(.5 + scale * sizeMainButton.cx);sizeMainButton.cy = (int)(.5 + scale * sizeMainButton.cy);}if (m_dwHideFlags & AFX_RIBBONBAR_HIDE_ALL){cy = m_nCaptionHeight;}else{if (m_bRecalcCategoryHeight){m_nCategoryHeight = 0;}//“选项卡”的高度m_nTabsHeight = tm.tmHeight + 2 * nYTabMargin;if (m_bRecalcCategoryHeight){for (int i = 0; i < m_arCategories.GetSize(); i++){CMFCRibbonCategory* pCategory = m_arCategories [i];ASSERT_VALID(pCategory);m_nCategoryHeight = max(m_nCategoryHeight, pCategory->GetMaxHeight(&dc));}m_bRecalcCategoryHeight = FALSE;}CKofMFCRibbonQuickAccessToolBar *pQAToolbar = (CKofMFCRibbonQuickAccessToolBar *)&m_QAToolbar;const CSize sizeAQToolbar = pQAToolbar->GetRegularSize(&dc);if (IsQuickAccessToolbarOnTop()){m_nCaptionHeight = max(m_nCaptionHeight, sizeAQToolbar.cy + (IsWindows7Look() ? 0 : (2 * nYMargin)));}//“快速访问工具栏”的高度const int nQuickAceesToolbarHeight = IsQuickAccessToolbarOnTop() ? 0 : sizeAQToolbar.cy;//“分类”的高度const int nCategoryHeight = (m_dwHideFlags & AFX_RIBBONBAR_HIDE_ELEMENTS) ? 0 : m_nCategoryHeight;cy = nQuickAceesToolbarHeight + nCategoryHeight + max( m_nCaptionHeight + m_nTabsHeight, m_sizeMainButton.cy + nYMargin);}if (afxGlobalData.DwmIsCompositionEnabled()){if (GetParent()->IsZoomed() && m_bReplaceFrameCaption){cy += ::GetSystemMetrics(SM_CYSIZEFRAME) - 2;}}dc.SelectObject(pOldFont);return CSize(32767, cy);
}

在MainFrm.h文件里面修改如下：

#include "KofMFCRibbonBar.h"class CMainFrame : public CMDIFrameWndEx
{//...
protected: //CMFCRibbonBar m_wndRibbonBar;CKofMFCRibbonBar m_wndRibbonBar;
}

这样子，运行结果还是原样，如下图所示：

现在试着改变高度，修改上面的代码，改动82行为如下：

改动98行为如下：
重新编译运行，效果如下图所示：