简单实现菜单自绘

简单对下面3 个消息处理 就可实现菜单自绘， 其他控件类似；

//WM_DRAWITEM：绘制菜单的样式
//WM_MEASUREITEM：指定要绘制菜单的大小
//WM_INITMENU：把框架菜单全部改成带MF_OWNERDRAW标志

void CTestRgnDlg::OnInitMenu(CMenu* pMenu)
{
//CDialog::OnInitMenu(pMenu);

CMenu *pSubMenu;
UINT nCount,nSubCount,nID;
CString strText;
nCount=pMenu->GetMenuItemCount();

for(UINT i=0;i<nCount;i++)
{
pSubMenu =pMenu->GetSubMenu(i);
nSubCount=pSubMenu->GetMenuItemCount();
for(UINT j=0;j<nSubCount;j++)
{
nID=pSubMenu->GetMenuItemID(j);
// 将框架菜单所有菜单都添加MF_OWNERDRAW标志
pSubMenu->ModifyMenu(j,MF_BYPOSITION|MF_OWNERDRAW,nID);
pSubMenu->GetMenuString(j,strText,MF_BYPOSITION);
}
}

// TODO: 在此处添加消息处理程序代码
}

void CTestRgnDlg::OnDrawItem(int nIDCtl, LPDRAWITEMSTRUCT lpDrawItemStruct)
{
LPDRAWITEMSTRUCT& lpD=lpDrawItemStruct; //起个别名,好用一点

//判断是不是菜单自绘,因为按钮也可以自绘
if(nIDCtl==0)
{
CDC* pDC=CDC::FromHandle(lpD->hDC); //得到菜单的设备指针,用来绘制菜单
pDC->SetBkMode(TRANSPARENT);

CMenu menu;
menu.Attach((HMENU)lpD->hwndItem); //得到框架菜单对象
CRect AllRgn(lpD->rcItem); //得到当前绘制的菜单选项项大小
CRect FrontRgn(AllRgn.left,AllRgn.top,20,AllRgn.bottom);
CBrush brushAll(RGB( 250,250,250 )); //初始化画刷
CBrush brushFront(RGB( 230,230,230 ));
CBrush brushSel(RGB(148,170,214 ));
CString strText;
menu.GetMenuString(lpD->itemID,strText,MF_BYCOMMAND);//得到当前绘制的菜单选项文本 　
if(lpD->itemID!=ID_SEPARATOR) //菜单和分隔栏分别绘制
{
if(lpD->itemAction & ODA_SELECT) //菜单选中时的样式
{
pDC->FillRect(AllRgn,&brushSel);//绘制
if(lpD->itemState &ODS_GRAYED)
//设定文本颜色(在最后才绘制出来)
pDC->SetTextColor(RGB(194,194,194));
else if(lpD->itemState & ODS_SELECTED)
pDC->SetTextColor(RGB(250,250,250));
}

//菜单非选中时的样式
if(!((lpD->itemAction & ODA_SELECT) && (lpD->itemState & ODS_SELECTED)))
{
pDC->FillRect(AllRgn,&brushAll);//绘制
pDC->FillRect(FrontRgn,&brushFront);
if(lpD->itemState & ODS_GRAYED)
pDC->SetTextColor(RGB(194,194,194 ));
else
pDC->SetTextColor(RGB(66,110,180 ));
}
}
else
pDC->FillRect(AllRgn,&brushFront);//绘制分隔栏

pDC->TextOut(AllRgn.left+30,AllRgn.top+5,strText);//打印出字体

menu.Detach();//分隔菜单句柄和对象(必要!)
}

//CDialog::OnDrawItem(nIDCtl, lpDrawItemStruct);
}

void CTestRgnDlg::OnMeasureItem(int nIDCtl, LPMEASUREITEMSTRUCT lpMeasureItemStruct)
{
// TODO: 在此添加消息处理程序代码和/或调用默认值
LPMEASUREITEMSTRUCT& lpM=lpMeasureItemStruct; //起个别名,好用一点

if(lpM->CtlType==ODT_MENU)
{ //判断是不是菜单要自绘
if(lpM->itemID!=ID_SEPARATOR)//分别设定普通菜单和分隔栏的大小　　
{
lpM->itemHeight=20;//普通菜单大小　
lpM->itemWidth=150;
}
else
{
lpM->itemHeight=1;//分隔栏大小
lpM->itemWidth=150;
}
}
}