自绘菜单的实现

自绘菜单的实现

闻怡洋译

在这里提供一个C++类(CCustomMenu)，该类是CMenu的子类，并且拥有自绘能力。它可以向你提供以下的功能：

1. 设置字体颜色。
2. 设置高亮度颜色。
3. 设置高亮度时的风格。
4. 设置选中时和在普通状态下的菜单显示的图标。
5. 设置显示图标大小。

在CCustomMenu中定义了结构MENUDATA，你必须根据你的需要填充该结构，并且在增加菜单时提供该结构的指针(调用AppendMenu,InsertMenu)。下面是一个例子：

1、定义CCustomMenu的实例，和MENUDATA结构变量。

CCustomMenu m_cCustomMenu;MENUDATA menuData [8];// as many menu items are present , You should be able to use //new and do the same2、调用CreateMenu()设置有关参数。

m_customMenu.CreateMenu ();m_customMenu.SetIconSize (25,25);//This is to set the size of the Icon. // This should be used only once for any menu// in order to resize it, destroy and create the menu again with  different size.m_customMenu.SetHighlightStyle (Normal); //Or TextOnly, if you want the// background color to remain the same// and the Text color to change to the Highlight color.        // The following setXXXColor sets the menu colors. If you dont want to change any, Dont call these member functions. 

       m_customMenu.SetTextColor (RGB (255,0,0));       m_customMenu.SetBackColor (RGB (255,255,255));       m_customMenu.SetHighlightColor (RGB (0,0,255));3、设置MENUDATA变量，并增加菜单项。     lstrcpy (menuData[0].menuText , "text1");    menuData[0].menuIconNormal= IDI_ICON1;    m_customMenu.AppendMenu (MF_OWNERDRAW,3,(LPCTSTR)menuData);

3、在你的窗口中重载OnMeasureItem(...)函数。

void CMyView::OnMeasureItem(int nIDCtl, LPMEASUREITEMSTRUCT lpMeasureItemStruct){if ( lpMeasureItemStruct->CtlType == ODT_MENU &&IsMenu((HMENU)lpMeasureItemStruct->itemID) &&(lpMeasureItemStruct->itemID == (UINT)m_hMenuSub) ){m_customMenu.MeasureItem (lpMeasureItemStruct);}else// let MFC's self-drawing handle itCView::OnMeasureItem(nIDCtl, lpMeasureItemStruct);}

下面的函数将帮助你设置菜单属性。

void SetTextColor (COLORREF );void SetBackColor (COLORREF);void SetHighlightColor (COLORREF);void SetIconSize (int, int);void SetHighlightStyle (HIGHLIGHTSTYLE ); // HIGHLIGHTSTYLE : enum {Normal, TextOnly}void SetHighlightTextColor (COLORREF);下面是文件代码：//*************************************************************************// CustomMenu.h : header file//#if!defined(AFX_CUSTOMMENU_H__FE5B01C3_1E02_11D1_B87A_0060979CDF6D__INCLUDED_)#define AFX_CUSTOMMENU_H__FE5B01C3_1E02_11D1_B87A_0060979CDF6D__INCLUDED_#if _MSC_VER >= 1000#pragma once#endif // _MSC_VER >= 1000class MENUDATA{public:MENUDATA () { menuIconNormal = -1; menuIconSelected = -1;};char  menuText[32];UINT menuIconNormal;UINT menuIconSelected;};typedef enum {Normal,TextOnly} HIGHLIGHTSTYLE;/////////////////////////////////////////////////////////////////////////////// CCustomMenu windowclass CCustomMenu : public CMenu{// Constructionpublic:CCustomMenu();// Attributespublic:// Operationspublic:// Overrides// ClassWizard generated virtual function overrides//{{AFX_VIRTUAL(CCustomMenu)//}}AFX_VIRTUAL// Implementationpublic:virtual ~CCustomMenu();virtual void DrawItem( LPDRAWITEMSTRUCT);virtual void MeasureItem( LPMEASUREITEMSTRUCT );void SetTextColor (COLORREF );void SetBackColor (COLORREF);void SetHighlightColor (COLORREF);void SetIconSize (int, int);void SetHighlightStyle (HIGHLIGHTSTYLE );void SetHighlightTextColor (COLORREF);// Generated message map functionsprotected:COLORREF m_crText;COLORREF m_clrBack;COLORREF m_clrText;COLORREF m_clrHilight;COLORREF m_clrHilightText;LOGFONT m_lf;CFont m_fontMenu;UINT m_iMenuHeight;BOOL m_bLBtnDown;CBrush m_brBackground,m_brSelect;CPen m_penBack;int m_iconX,m_iconY;HIGHLIGHTSTYLE m_hilightStyle;//{{AFX_MSG(CCustomMenu)// NOTE - the ClassWizard will add and remove member functions here.//}}AFX_MSG};///////////////////////////////////////////////////////////////////////////////{{AFX_INSERT_LOCATION}}// Microsoft Developer Studio will insert additional declarations immediately before the previous line.#endif //!defined(AFX_CUSTOMMENU_H__FE5B01C3_1E02_11D1_B87A_0060979CDF6D__INCLUDED_)//*************************************************************************// CustomMenu.cpp : implementation file//#include "stdafx.h"#include "CustomMenu.h"#ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE[] = __FILE__;#endif/////////////////////////////////////////////////////////////////////////////// CCustomMenuCCustomMenu::CCustomMenu(){m_clrText =  GetSysColor (COLOR_MENUTEXT);m_clrBack = GetSysColor (COLOR_MENU);m_brBackground.CreateSolidBrush (m_clrBack);m_penBack.CreatePen (PS_SOLID,0,m_clrBack);m_crText = m_clrText;m_bLBtnDown = FALSE;m_iconX =GetSystemMetrics ( SM_CXMENUCHECK);m_iconY =GetSystemMetrics (SM_CYMENUCHECK );m_clrHilight = GetSysColor (COLOR_HIGHLIGHT);m_brSelect.CreateSolidBrush (m_clrHilight);m_clrHilightText = GetSysColor (COLOR_HIGHLIGHTTEXT);ZeroMemory ((PVOID) &m_lf,sizeof (LOGFONT));NONCLIENTMETRICS nm;nm.cbSize = sizeof (NONCLIENTMETRICS);//Get the system metrics for the CaptionfromhereVERIFY (SystemParametersInfo (SPI_GETNONCLIENTMETRICS,0,&nm,0)); m_lf =  nm.lfMenuFont;m_iMenuHeight = nm.iMenuHeight;m_fontMenu.CreateFontIndirect (&m_lf);}CCustomMenu::~CCustomMenu(){if ((HBRUSH) m_brBackground != NULL)m_brBackground.DeleteObject ();if ((HFONT)m_fontMenu !=NULL)m_fontMenu.DeleteObject ();if ((HBRUSH)m_brSelect != NULL) m_brSelect.DeleteObject ();}/////////////////////////////////////////////////////////////////////////////// CCustomMenu message handlersvoid CCustomMenu::DrawItem (LPDRAWITEMSTRUCT lpDIS){ASSERT(lpDIS != NULL);CDC* pDC = CDC::FromHandle(lpDIS->hDC);CRect rect;HICON hIcon;COLORREF crText = m_crText;// draw the colored rectangle portionrect.CopyRect(&lpDIS->rcItem);// draw the up/down/focused/disabled stateUINT action = lpDIS->itemAction;UINT state = lpDIS->itemState;CString strText;LOGFONT lf;lf = m_lf;CFont dispFont;CFont *pFont;//GetWindowText(strText);if (lpDIS->itemData != NULL){strText = (((MENUDATA*) (lpDIS->itemData))->menuText);if ((((MENUDATA *)(lpDIS->itemData))->menuIconNormal) == -1)hIcon = NULL;else if (state & ODS_SELECTED){if ((((MENUDATA *)(lpDIS->itemData))->menuIconSelected) != -1)hIcon = AfxGetApp ()->LoadIcon (((MENUDATA *)(lpDIS->itemData))->menuIconSelected);elsehIcon = AfxGetApp()->LoadIcon (((MENUDATA*)(lpDIS->itemData))->menuIconNormal);}elsehIcon = AfxGetApp()->LoadIcon (((MENUDATA*)(lpDIS->itemData))->menuIconNormal);TRACE1 ("Draw for %s", strText);}else{strText.Empty();hIcon = NULL;}if ( (state & ODS_SELECTED) ){// draw the down edgesCPen *pOldPen = pDC->SelectObject (&m_penBack);//You need only Text highlight and thats what you getif (m_hilightStyle != Normal){pDC->FillRect (rect,&m_brBackground);}else{pDC->FillRect (rect,&m_brSelect);}pDC->SelectObject (pOldPen);pDC->Draw3dRect (rect,GetSysColor (COLOR_3DHILIGHT),GetSysColor(COLOR_3DSHADOW));lf.lfWeight = FW_BOLD;if ((HFONT)dispFont != NULL)dispFont.DeleteObject ();dispFont.CreateFontIndirect (&lf);crText = m_clrHilightText;//While selected move the text a bitTRACE0 ("SELECT,SELECTED");}else{CPen *pOldPen = pDC->SelectObject (&m_penBack);pDC->FillRect (rect,&m_brBackground);pDC->SelectObject (pOldPen);// draw the up edgespDC->Draw3dRect (rect,m_clrBack,m_clrBack);if ((HFONT)dispFont != NULL)dispFont.DeleteObject ();dispFont.CreateFontIndirect (&lf); //NormalTRACE0 ("SELECT, NORMAL");}// draw the text if there is any//We have to paint the text only if the image is nonexistantif (hIcon != NULL){if(DrawIconEx (pDC->GetSafeHdc(),rect.left,rect.top,hIcon,(m_iconX)?m_iconX:32,(m_iconY)?m_iconY:32,0,NULL,DI_NORMAL))TRACE0("Wrote the icon successfully");elseTRACE0 ("SORRY.NOGO");}//This is needed always so that we can have the space for check marksrect.left = rect.left +((m_iconX)?m_iconX:32); if ( !strText.IsEmpty()){//pFont->GetLogFont (&lf);int  iOldMode = pDC->GetBkMode();pDC->SetBkMode( TRANSPARENT);pDC->SetTextColor( crText);pFont = pDC->SelectObject (&dispFont);TRACE1( "About To DrawText %s",strText);pDC->DrawText (strText,rect,DT_LEFTDT_SINGLELINEDT_VCENTER);TRACE0("Done");pDC->SetBkMode( iOldMode );pDC->SelectObject (pFont); //set it to the old font}dispFont.DeleteObject ();}void CCustomMenu::MeasureItem( LPMEASUREITEMSTRUCT lpMIS ){CDC *pDC = AfxGetApp()->m_pMainWnd->GetDC();CFont* pFont = pDC->SelectObject (&m_fontMenu);int iconX = 0,iconY= 0;TEXTMETRIC tm;pDC->GetTextMetrics (&tm);pDC->SelectObject (pFont);AfxGetApp()->m_pMainWnd->ReleaseDC (pDC);if (m_iconX)iconX = m_iconX;if (m_iconY)iconY = m_iconY;lpMIS->itemWidth = iconX + tm.tmAveCharWidth *  lstrlen(((MENUDATA*)(lpMIS->itemData))->menuText) +10;lpMIS->itemHeight = (iconY > (m_iMenuHeight+1))?iconY:m_iMenuHeight + 1;}void CCustomMenu::SetIconSize (int width, int height){m_iconX = width;m_iconY = height;}void CCustomMenu::SetTextColor (COLORREF clrText){m_crText = clrText;}void CCustomMenu::SetBackColor (COLORREF clrBack){m_clrBack = clrBack;if ((HBRUSH)m_brBackground != NULL)m_brBackground.DeleteObject ();m_brBackground.CreateSolidBrush (clrBack);}void CCustomMenu::SetHighlightColor (COLORREF clrHilight){m_clrHilight = clrHilight;if ((HBRUSH)m_brSelect != NULL)m_brSelect.DeleteObject ();m_brSelect.CreateSolidBrush (clrHilight);}void CCustomMenu::SetHighlightTextColor (COLORREF clrHilightText){m_clrHilightText = clrHilightText;}void CCustomMenu::SetHighlightStyle (HIGHLIGHTSTYLE hilightStyle){m_hilightStyle = hilightStyle;}//*************************************************************************

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