CMenu自绘

1、创建一个CMenu类的派生类，并重写DrawItem(LPDRAWITEMSTRUCT lpDS)、MeasureItem(LPMEASUREITEMSTRUCT lpMS)函数：

如下：

#pragma once
#include "afxwin.h"
class CMyMenu :public CMenu
{
public:
	CMyMenu(void);
	~CMyMenu(void);
private:
	struct SItem{
		HICON hIcon;
		char szText[32];
		int nHeight;
	};
	CMap<WORD,WORD,SItem,SItem> m_map;//菜单Id与对应的节点信息


public:
	virtual void DrawItem(LPDRAWITEMSTRUCT lpDS);
	virtual void MeasureItem(LPMEASUREITEMSTRUCT lpMS);
	BOOL AppendMenu(UINT_PTR nIDNewItem = 0,LPCTSTR lpszNewItem = NULL ,HICON hIcon = NULL,UINT nFlags = 0);
};

#include "StdAfx.h"
#include "MyMenu.h"


CMyMenu::CMyMenu(void)
{
}


CMyMenu::~CMyMenu(void)
{
}


void CMyMenu::DrawItem(LPDRAWITEMSTRUCT lpDS)
{
	CDC* pDC = CDC::FromHandle(lpDS->hDC);

	CRect rect = lpDS->rcItem;

	CString strText;

	SItem &sItem = m_map[lpDS->itemID];

	if(lpDS->itemID) strText = sItem.szText;

	//选中状态菜单项:画边线和浅蓝色填充
	if((lpDS->itemState & ODS_SELECTED)&&(lpDS->itemAction & ODA_SELECT))
	{
		pDC->FillSolidRect(&rect,::GetSysColor(COLOR_MENU));
		rect.DeflateRect(1,1);
		CPen pen(PS_SOLID,1,GetSysColor(COLOR_HIGHLIGHT));
		CBrush br(RGB(182,189,210));
		pDC->SelectObject(&pen);
		pDC->SelectObject(br);
		pDC->Rectangle(rect);
	}
	else//非选中状态:普通背景填充
	{
		pDC->FillSolidRect(&rect,GetSysColor(COLOR_MENU));

		if (rect.Height() == 10)//如果是分隔条菜单:画两条线
		{
			CPen pen1(PS_SOLID,1,GetSysColor(COLOR_BTNSHADOW));
			pDC->SelectObject(&pen1);
			pDC->MoveTo(rect.left+2,rect.top+4);
			pDC->LineTo(rect.right-2,rect.top+4);

			CPen pen2(PS_SOLID,1,GetSysColor(COLOR_HOTLIGHT));
			pDC->SelectObject(&pen2);
			pDC->MoveTo(rect.left+2,rect.top+5);
			pDC->LineTo(rect.right-2,rect.top+5);

			return;
		}
		rect.DeflateRect(1,1);
	}

	//画图标
	pDC->DrawIcon(rect.left+1,rect.top+1,sItem.hIcon);

	pDC->SetBkMode(TRANSPARENT);
    rect.left+=35;
	pDC->DrawText(strText,rect,DT_LEFT|DT_VCENTER|DT_SINGLELINE);
	
}


void CMyMenu::MeasureItem(LPMEASUREITEMSTRUCT lpMS)
{
	lpMS->itemWidth = 80;//菜单项的宽度

	lpMS->itemHeight = m_map[lpMS->itemID].nHeight;//每个菜单项的高度
}

BOOL CMyMenu::AppendMenu(UINT_PTR nIDNewItem,LPCTSTR lpszNewItem,HICON hIcon,UINT nFlags)
{
	//将菜单的文字和图标信息按照ID进行登记，以便自绘时使用

	SItem sItem = {hIcon};

	if(lpszNewItem) strcpy(sItem.szText,lpszNewItem);

	if(nFlags & MF_SEPARATOR) sItem.nHeight = 10;
	else sItem.nHeight = 35;

	//根据ID添加到map中
	m_map[nIDNewItem] = sItem;

	//每个插入的菜单项都自动添加自绘属性
	return CMenu::AppendMenu(nFlags|MF_OWNERDRAW,nIDNewItem,lpszNewItem);

}

2、在主对话框的视图类的OnContextMenu(CWnd* pWnd, CPoint point)函数中进行弹出式菜单的操作：

void CMenu自绘View::OnContextMenu(CWnd* pWnd, CPoint point)
{
	CMyMenu Menu;
	Menu.CreatePopupMenu();

	HICON hIcon = AfxGetApp()->LoadIcon(IDI_ICON1);
	Menu.AppendMenu(ID_EDIT_UNDO,"撤销",hIcon);

	//hIcon = AfxGetApp()->LoadIcon(IDI_ICON2);
	Menu.AppendMenu(ID_EDIT_CUT,"剪切",hIcon);

	//hIcon = AfxGetApp()->LoadIcon(IDI_ICON3);
	Menu.AppendMenu(ID_FILE_SAVE,"保存",hIcon);

	//hIcon = AfxGetApp()->LoadIcon(IDI_ICON4);
	Menu.AppendMenu(ID_FILE_SAVE_AS,"另存为",hIcon);

	Menu.AppendMenu(0,NULL,0,MF_SEPARATOR);

	Menu.TrackPopupMenu(TPM_LEFTALIGN,point.x,point.y,this);
}

如图：