Question

MFC怎么实现一个对话框上多个按钮的自绘

void CMyDlg::OnDrawItem(int nIDCtl, LPDRAWITEMSTRUCT lpDrawItemStruct)
{CDC ButtonDC;
CBitmap bitmapTrans;
BITMAP bmp;
CDC mem;
CRect rc;
ButtonDC.Attach(lpDrawItemStruct->hDC);//得到用于绘制按钮的DC
mem.CreateCompatibleDC(&ButtonDC);//准备用于向按钮区域传输位图
rc=lpDrawItemStruct->rcItem;//获取按钮所占的矩形大小
UINT state = lpDrawItemStruct->itemState; //获取按钮目前所处的状态，根据不同的状态绘制不同的按钮 if(state&ODS_FOCUS)//如果按钮已经得到焦点，绘制选中状态下的按钮
{
bitmapTrans.LoadBitmap(IDB_BITMAP3);
bitmapTrans.GetBitmap(&bmp);
CBitmap *old=mem.SelectObject(&bitmapTrans);
ButtonDC.StretchBlt(rc.left,rc.top,rc.right,rc.bottom,&mem,0,0,bmp.bmWidth,bmp.bmHeight,SRCCOPY);
mem.SelectObject(old);
bitmapTrans.DeleteObject();
//设置文字背景为透明
ButtonDC.SetBkMode(TRANSPARENT);
ButtonDC.DrawText("查找单词",&rc,DT_CENTER|DT_VCENTER|DT_SINGLELINE);
}
else
{
bitmapTrans.LoadBitmap(IDB_BITMAP3);
CBitmap *old2 = mem.SelectObject(&bitmapTrans);
bitmapTrans.GetBitmap(&bmp);
CBitmap *old=mem.SelectObject(&bitmapTrans);
ButtonDC.StretchBlt(rc.left,rc.top,rc.right,rc.bottom,&mem,0,0,bmp.bmWidth,bmp.bmHeight,SRCCOPY);
ButtonDC.SetBkMode(TRANSPARENT);
ButtonDC.DrawText("增加单词",&rc,DT_CENTER|DT_VCENTER|DT_SINGLELINE);
mem.SelectObject(old2);
bitmapTrans.DeleteObject();
}
CDialog::OnDrawItem(nIDCtl, lpDrawItemStruct);
}这只能实现两个按钮，而且如果有多个按钮，点击按钮上面的文本会互相交换。。。求大神指点~

Answer 1

Answer 2

要区分按钮ID