我們知道使用VC開發大型的應用系統時，都會碰到一個界面設計和風格布局的問題。如果一切都重頭開始設計和編寫的話，將會是巨大的工作量。在短時間內很難寫出一個比較健壯功能強大的界面系統出來。對軟件項目進度也帶來了不可預測的風險。在這種形勢下BCG庫就應運而生了。目前BCG可以做出諸如Visual Studio .Net 2003 ，Outlook等大型界面系統。幾乎可以滿足目前市場上絕大多數管理信息系統的界面要求。在我所看到的很多ERP，GSP等的MIS軟件公司，都在采用BCG系統。該庫非常穩定和易用。

隨著 Mircorsoft WindowsXP 系統的推出，計算機世界已經進入個性化時代。用戶對界面系統提出更高一層的要求。盡管BCG本身自帶了Skin工程，但那個工程的功能還是非常弱的。主要表現在：

• 不能對標題欄，滾動條和 Windows 系統標準的窗口換膚；
• 沒有豐富的界面元素提供下載。

本人使用Skin++庫(www.uipower.com)，在BCG的例子中作了幾處改動后，BCG就擁有了動態換膚的功能。

我們在這里以BCGCBDotNetExample為例：

1、Skin頭文件的包含在StdAfx.h中包含Skin庫的頭文件。

#include "SkinPlusPlus.h"

2、Skin庫的加載：

BOOL CBCGCBDotNetExampleApp::InitInstance()
{
......
InitializeSkin(_T("XPCorona.ssk"));
......
}

3、讓BCG重新取下系統色：

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
..................
-----------------
// Create menu bar:
//-----------------
if (!m_wndMenuBar.Create (this))
{
TRACE0("Failed to create menubar\n");
return -1; // fail to create
}
m_wndMenuBar.SendMessage(WM_SYSCOLORCHANGE,0,0);
..................
}

4、工具條圖標的透明色問題；

從CBCGPToolBar派生一個子類CMyBCGPToolBar，在該子類中覆蓋CBCGPToolBar的 virtual void DoPaint(CDC* pDCPaint)。這里主要處理工具條圖標的透明色問題。

凡是使用CBCGPToolBar的地方全部替換成CMyBCGPToolBar。這樣你的工具條就有了和皮膚一致的皮膚色。而不是Windows的系統色。代碼如下：

#ifndef _MYTOOLBAR_H_
#define _MYTOOLBAR_H_
#include "stdafx.h"
class CMyBCGPToolBar : public CBCGPToolBar
{
public:
virtual void DoPaint(CDC* pDCPaint)
{
ASSERT_VALID(this);
ASSERT_VALID(pDCPaint);
CRect rectClip;
pDCPaint->GetClipBox (rectClip);
BOOL bHorz = GetCurrentAlignment () & CBRS_ORIENT_HORZ ? TRUE : FALSE;
CRect rectClient;
GetClientRect (rectClient);
CDC* pDC = pDCPaint;
BOOL m_bMemDC = FALSE;
CDC dcMem;
CBitmap bmp;
CBitmap* pOldBmp = NULL;
if (dcMem.CreateCompatibleDC (pDCPaint) &&
bmp.CreateCompatibleBitmap (pDCPaint, rectClient.Width (),
rectClient.Height ()))
{
m_bMemDC = TRUE;
pOldBmp = dcMem.SelectObject (&bmp);
pDC = &dcMem;
if ((GetStyle () & TBSTYLE_TRANSPARENT) == 0)
{
CBCGPVisualManager::GetInstance ()->OnFillBarBackground (pDC, this,
rectClient, rectClip);
}
}
OnFillBackground (pDC);
pDC->SetTextColor (globalData.clrBtnText);
pDC->SetBkMode (TRANSPARENT);
CRect rect;
GetClientRect(rect);
if (bHorz)
{
rect.bottom = rect.top + GetRowHeight ();
}
else
{
rect.right = rect.left + GetColumnWidth ();
}
CBCGPToolBarImages* pImages = GetImageList
(m_Images, m_ImagesLocked, m_LargeImages, m_LargeImagesLocked);
CBCGPToolBarImages* pHotImages = pImages;
CBCGPToolBarImages* pColdImages = GetImageList(m_ColdImages,
m_ColdImagesLocked, m_LargeColdImages,m_LargeColdImagesLocked);
CBCGPToolBarImages* pDisabledImages = GetImageList(m_DisabledImages,
m_DisabledImagesLocked, m_LargeDisabledImages,m_LargeDisabledImagesLocked);
CBCGPToolBarImages* pMenuImages = !m_bLocked ?
&m_MenuImages : &m_MenuImagesLocked;
CBCGPToolBarImages* pDisabledMenuImages = !m_bLocked ?
&m_DisabledMenuImages : &m_DisabledMenuImagesLocked;
BOOL bDrawImages = pImages->IsValid ();
//globalData.clrBtnFace
pHotImages->SetTransparentColor(GetDefaultSysColor(COLOR_BTNFACE));
BOOL bFadeInactiveImages = CBCGPVisualManager::GetInstance ()->IsFadeInactiveImage ();
CBCGPDrawState ds;
if (bDrawImages &&
!pHotImages->PrepareDrawImage (ds,
m_bMenuMode ? m_sizeMenuImage : GetImageSize (),
bFadeInactiveImages))
{
return;
}
CFont* pOldFont;
if (bHorz)
{
pOldFont = (CFont*) pDC->SelectObject (&globalData.fontRegular);
}
else
{
pOldFont = (CFont*) pDC->SelectObject (&globalData.fontVert);
}
if (pColdImages->GetCount () > 0)
{
CBCGPVisualManager::GetInstance ()->SetFadeInactiveImage (FALSE);
}
if (pColdImages->GetCount ())
{
CBCGPVisualManager::GetInstance ()->SetFadeInactiveImage (FALSE);
}
int iButton = 0;
for (POSITION pos = m_Buttons.GetHeadPosition (); pos != NULL; iButton ++)
{
CBCGPToolbarButton* pButton = (CBCGPToolbarButton*) m_Buttons.GetNext (pos);
if (pButton == NULL)
{
break;
}
ASSERT_VALID (pButton);
rect = pButton->Rect ();
CRect rectInter;
if (pButton->m_nStyle & TBBS_SEPARATOR)
{
BOOL bHorzSeparator = bHorz;
CRect rectSeparator; rectSeparator.SetRectEmpty ();
OnCalcSeparatorRect (pButton, rectSeparator, bHorz);
if (pButton->m_bWrap && bHorz)
{
bHorzSeparator = FALSE;
}
if (rectInter.IntersectRect (rectSeparator, rectClip) && !pButton->IsHidden())
{
DrawSeparator (pDC, rectSeparator, bHorzSeparator);
}
continue;
}
if (!rectInter.IntersectRect (rect, rectClip))
{
continue;
}
BOOL bHighlighted = FALSE;
BOOL bDisabled = (pButton->m_nStyle & TBBS_DISABLED) && !IsCustomizeMode ();
if (IsCustomizeMode () && !m_bLocked)
{
bHighlighted = FALSE;
}
else
{
if (m_bMenuMode)
{
bHighlighted = (iButton == m_iHighlighted);
}
else
{
bHighlighted = ((iButton == m_iHighlighted ||
iButton == m_iButtonCapture) &&
(m_iButtonCapture == -1 ||
iButton == m_iButtonCapture));
}
}
if (pDC->RectVisible(&rect))
{
BOOL bDrawDisabledImages = FALSE;
if (bDrawImages)
{
CBCGPToolBarImages* pNewImages = NULL;
if (pButton->m_bUserButton)
{
if (pButton->GetImage () >= 0)
{
pNewImages = m_pUserImages;
}
}
else
{
if (m_bMenuMode)
{
if (bDisabled && pDisabledMenuImages->GetCount () > 0)
{
bDrawDisabledImages = TRUE;
pNewImages = pDisabledMenuImages;
}
else if (pMenuImages->GetCount () > 0)
{
pNewImages = pMenuImages;
}
else
{
bDrawDisabledImages =
(bDisabled && pDisabledImages->GetCount () > 0);
pNewImages = bDrawDisabledImages ? pDisabledImages : pHotImages;
}
}
else // Toolbar mode
{
bDrawDisabledImages =
(bDisabled && pDisabledImages->GetCount () > 0);
pNewImages = bDrawDisabledImages ? pDisabledImages : pHotImages;
if (!bHighlighted && !bDrawDisabledImages &&
(pButton->m_nStyle & TBBS_PRESSED) == 0 &&
pColdImages->GetCount () > 0 &&
!pButton->IsDroppedDown ())
{
pNewImages = pColdImages;
}
}
}
if (bDrawImages && pNewImages != pImages && pNewImages != NULL)
{
pImages->EndDrawImage (ds);
pNewImages->SetTransparentColor (globalData.clrBtnFace);
pNewImages->PrepareDrawImage (ds,
m_bMenuMode ? m_sizeMenuImage : GetImageSize (), bFadeInactiveImages);
pImages = pNewImages;
}
}
DrawButton (pDC, pButton, bDrawImages ? pImages : NULL,
bHighlighted, bDrawDisabledImages);
}
}
//-------------------------------------------------------------
// Highlight selected button in the toolbar customization mode:
//-------------------------------------------------------------
if (m_iSelected >= m_Buttons.GetCount ())
{
m_iSelected = -1;
}
if (IsCustomizeMode () && m_iSelected >= 0 && !m_bLocked &&
m_pSelToolbar == this)
{
CBCGPToolbarButton* pSelButton = GetButton (m_iSelected);
ASSERT (pSelButton != NULL);
if (pSelButton != NULL && pSelButton->CanBeStored ())
{
CRect rectDrag1 = pSelButton->Rect ();
if (pSelButton->GetHwnd () != NULL)
{
rectDrag1.InflateRect (0, 1);
}
pDC->Draw3dRect(&rectDrag1, globalData.clrBtnText, globalData.clrBtnText);
rectDrag1.DeflateRect (1, 1);
pDC->Draw3dRect(&rectDrag1, globalData.clrBtnText, globalData.clrBtnText);
}
}
if (IsCustomizeMode () && m_iDragIndex >= 0 && !m_bLocked)
{
DrawDragMarker (pDC);
}
pDC->SelectObject (pOldFont);
if (bDrawImages)
{
pImages->EndDrawImage (ds);
}
if (m_bMemDC)
{
//--------------------------------------
// Copy the results to the on-screen DC:
//--------------------------------------
pDCPaint->BitBlt (rectClip.left, rectClip.top, rectClip.Width(), rectClip.Height(),
&dcMem, rectClip.left, rectClip.top, SRCCOPY);
dcMem.SelectObject(pOldBmp);
}
CBCGPVisualManager::GetInstance ()->SetFadeInactiveImage (bFadeInactiveImages);
}
};
#endif //_MYTOOLBAR_H_

5、Skin 庫的釋放：

int CBCGCBDotNetExampleApp::ExitInstance()
{
ExitSkin();
.......
}