在菜单中显示位图的源码，一起来研究一下

#include <afxwin.h> #include <afxcmn.h> #include <afxtempl.h> #include <BitmapMenu.h> BMenuData::BMenuData() { menuIconNormal = -1; menuIconSelected = -1; menuIconDisabled = -1; nID = 0; } CBitmapMenu::CBitmapMenu(CImageList* pList) { SetImageList(pList); m_clrText = GetSysColor(COLOR_MENUTEXT); m_clrBack = GetSysColor(COLOR_MENU); m_brBackground.CreateSolidBrush(m_clrBack); m_penBack.CreatePen(PS_SOLID,0,m_clrBack); m_bLBtnDown = FALSE; m_hilightStyle = Normal; m_clrHilight = GetSysColor(COLOR_HIGHLIGHT); m_brSelect.CreateSolidBrush(m_clrHilight); m_clrHilightText = GetSysColor(COLOR_HIGHLIGHTTEXT); ZeroMemory((LPVOID)&m_lf,sizeof(LOGFONT)); NONCLIENTMETRICS nm; nm.cbSize = sizeof(NONCLIENTMETRICS); //Get the system metrics for the Captionfromhere VERIFY(SystemParametersInfo(SPI_GETNONCLIENTMETRICS,0,&nm,0)); m_lf = nm.lfMenuFont; m_iMenuHeight = nm.iMenuHeight; m_fontMenu.CreateFontIndirect(&m_lf); } CBitmapMenu::~CBitmapMenu() { DestroyMenu(); } BOOL CBitmapMenu::DestroyMenu() { // Destroy Sub menus: int m; for( m = m_SubMenus.GetUpperBound(); m >= 0; m-- ) delete(m_SubMenus[m]); m_SubMenus.RemoveAll(); // Destroy brushes: if( (HBRUSH)m_brBackground != NULL ) m_brBackground.DeleteObject(); if( (HFONT)m_fontMenu != NULL ) m_fontMenu.DeleteObject(); if( (HBRUSH)m_brSelect != NULL ) m_brSelect.DeleteObject (); // Destroy menu data int numItems; numItems = m_MenuList.GetUpperBound(); for( m = 0; m <= numItems; m++ ) delete(m_MenuList[m]); m_MenuList.RemoveAll(); // Call base-class implementation last: return(CMenu::DestroyMenu()); } /* ================================================================================= void CBitmapMenu::DrawItem(LPDRAWITEMSTRUCT) --------------------------------------- Called by the framework when a particular item needs to be drawn. We overide this to draw the menu item in a custom-fashion, including icons and the 3D rectangle bar. ================================================================================= */ void CBitmapMenu::DrawItem(LPDRAWITEMSTRUCT lpDIS) { ASSERT(lpDIS != NULL); CDC* pDC; pDC = CDC::FromHandle(lpDIS->hDC); CRect rect; HICON hIcon; COLORREF clrText; clrText = m_clrText; // draw the colored rectangle portion rect.CopyRect(&lpDIS->rcItem); // draw the up/down/focused/disabled state UINT action; UINT state; action = lpDIS->itemAction; state = lpDIS->itemState; CString strText; LOGFONT lf; lf = m_lf; CFont dispFont; CFont *pFont; if( lpDIS->itemData != NULL ) { int nIconNormal = (((BMenuData*)(lpDIS->itemData))->menuIconNormal); int nIconSelected = (((BMenuData*)(lpDIS->itemData))->menuIconSelected); int nIconDisabled = (((BMenuData*)(lpDIS->itemData))->menuIconDisabled); strText = (((BMenuData*)(lpDIS->itemData))->menuText); if(nIconNormal == -1) hIcon = NULL; else { hIcon = NULL; // Obtain the IDs for the appropriate Icons: if( state & ODS_SELECTED && !(state & ODS_GRAYED) ) { // Selected (but not disabled) if( nIconSelected != -1 ) hIcon = m_pList->ExtractIcon(nIconSelected); } else { if( state & ODS_GRAYED ) // Disabled (selected or not) if( nIconDisabled != -1 ) hIcon = m_pList->ExtractIcon(nIconDisabled); } // If we didn't manage to select a specific icon, we'll use the // default (normal) one... if( hIcon == NULL ) hIcon = m_pList->ExtractIcon(nIconNormal); } } else { strText.Empty(); hIcon = NULL; } if( (state & ODS_SELECTED) ) { // draw the down edges CPen *pOldPen = pDC->SelectObject(&m_penBack); // You need only Text highlight and thats what you get if( m_hilightStyle != Normal ) pDC->FillRect(rect,&m_brBackground); else pDC->FillRect(rect,&m_brSelect); pDC->SelectObject(pOldPen); // This version provides a black-border: //pDC->Draw3dRect(rect,GetSysColor (COLOR_3DHILIGHT),RGB(0,0,0)); //lf.lfWeight = FW_BOLD; if( (HFONT)dispFont != NULL ) dispFont.DeleteObject(); dispFont.CreateFontIndirect(&lf); clrText = m_clrHilightText; } else { CPen *pOldPen = pDC->SelectObject(&m_penBack); pDC->FillRect (rect,&m_brBackground); pDC->SelectObject (pOldPen); // draw the up edges pDC->Draw3dRect (rect,m_clrBack,m_clrBack); if( (HFONT)dispFont != NULL ) dispFont.DeleteObject(); dispFont.CreateFontIndirect(&lf); } // draw the text if there is any //We have to paint the text only if the image is nonexistant if (hIcon != NULL) DrawIconEx(pDC->GetSafeHdc(), rect.left, rect.top + (rect.Height() - m_nIconY) / 2, hIcon, m_nIconX, m_nIconY, 0, NULL, DI_NORMAL); rect.left = rect.left + m_nIconX + 2; if( !strText.IsEmpty() ) { int iOldMode = pDC->GetBkMode(); pDC->SetBkMode(TRANSPARENT); // Draw the text in the correct colour: UINT nFormat = DT_LEFT|DT_SINGLELINE|DT_EXPANDTABS|DT_VCENTER; if( !(lpDIS->itemState & ODS_GRAYED) ) { pDC->SetTextColor(clrText); pDC->DrawText (strText,rect,nFormat); } else { // Draw the slightly lighter greyed text at an offset: RECT offset = *rect; offset.left += 1; offset.right += 1; offset.top += 1; offset.bottom += 1; pDC->SetTextColor(GetSysColor(COLOR_BTNHILIGHT)); pDC->DrawText(strText,&offset, nFormat); // And the standard Grey text: pDC->SetTextColor(GetSysColor(COLOR_GRAYTEXT)); pDC->DrawText(strText,rect, nFormat); } pFont = pDC->SelectObject(&dispFont); pDC->SetBkMode(iOldMode); pDC->SelectObject(pFont); //set it to the old font } dispFont.DeleteObject(); } /* ================================================================================= void CBitmapMenu::MeasureItem(LPMEASUREITEMSTRUCT) --------------------------------------------- Called by the framework when it wants to know what the width and height of our item will be. To accomplish this we provide the width of the icon plus the width of the menu text, and then the height of the icon. ================================================================================= */ void CBitmapMenu::MeasureItem(LPMEASUREITEMSTRUCT lpMIS) { // Obtain the width of the text: CWnd *pWnd = AfxGetMainWnd(); // Get main window CDC *pDC = pWnd->GetDC(); // Get device context CFont* pFont = pDC->SelectObject(&m_fontMenu); // Select menu font in... LPCTSTR lpstrText = (((BMenuData*)(lpMIS->itemData))->menuText); // Get pointer to text SIZE t; GetTextExtentPoint32(pDC->GetSafeHdc(), lpstrText, strlen(lpstrText), &t); // Width of caption pDC->SelectObject(pFont); // Select old font in pWnd->ReleaseDC(pDC); // Release the DC lpMIS->itemWidth = t.cx; lpMIS->itemHeight = max(GetSystemMetrics(SM_CYMENU), t.cy); lpMIS->itemWidth += m_nIconX; lpMIS->itemHeight = max(m_nIconY, lpMIS->itemHeight); } void CBitmapMenu::SetTextColor(COLORREF clrText) { m_clrText = clrText; } void CBitmapMenu::SetBackColor(COLORREF clrBack) { m_clrBack = clrBack; if( (HBRUSH)m_brBackground != NULL ) m_brBackground.DeleteObject(); m_brBackground.CreateSolidBrush (clrBack); } void CBitmapMenu::SetHighlightColor(COLORREF clrHilight) { m_clrHilight = clrHilight; if( (HBRUSH)m_brSelect != NULL ) m_brSelect.DeleteObject(); m_brSelect.CreateSolidBrush(clrHilight); } void CBitmapMenu::SetHighlightTextColor(COLORREF clrHilightText) { m_clrHilightText = clrHilightText; } void CBitmapMenu::SetHighlightStyle(HIGHLIGHTSTYLE hilightStyle) { m_hilightStyle = hilightStyle; } void CBitmapMenu::SetImageList(CImageList* pList) { m_pList = pList; if( m_pList != NULL ) { IMAGEINFO info;; m_pList->GetImageInfo(0, &info); m_nIconX = in