可以显示多行内容的ListBox

//File: ToolTip2.cpp //Implementation file for class CToolTip2 //Copyright (C) 2000 Dhandapani Ammasai( dammasai@hotmail.com ) //Mail your comments, criticism, bugs to the above e-mail address. #include "stdafx.h" #include "tooltip2.h" IMPLEMENT_DYNAMIC( CToolTip2, CWnd ); BEGIN_MESSAGE_MAP(CToolTip2, CWnd) //{{AFX_MSG_MAP(CToolTip2) ON_WM_PAINT() //}}AFX_MSG_MAP END_MESSAGE_MAP() //Default Constructor CToolTip2::CToolTip2() { m_szText = ""; m_pParentWnd = NULL; m_bShowStatus = FALSE; } //Destructor CToolTip2::~CToolTip2() { } //Create Tool Tip BOOL CToolTip2::Create(CWnd* pParentWnd) { ASSERT(this != NULL ); ASSERT(pParentWnd != NULL); m_pParentWnd = pParentWnd; //Create font m_font.CreateFont(15, 0, 0, 0, FW_REGULAR, 0, 0, 0, 0, 0, 0, 0, 0, "MS Sans Serif"); CRect rectInitialSize(0,0,0,0);//Initial Window size. Will be dynamically changed later. return CreateEx(WS_EX_TOOLWINDOW , NULL, NULL,WS_POPUP | WS_CHILD | WS_CLIPSIBLINGS, rectInitialSize,pParentWnd, NULL, NULL); } //Set tooltip text void CToolTip2::SetText(const CString& rsText) { ASSERT(this != NULL ); m_szText = rsText; m_szText.TrimRight(); } //Show tooltip //rCurrentPoint specifies current mouse position and it is in client coordinates of parent window(Not in screen coordinates). BOOL CToolTip2::Show(const CPoint& rCurrentPoint) { ASSERT(this != NULL ); ASSERT(m_hWnd != NULL ); //Is text empty or tool tip already displayed? if ( m_szText.IsEmpty() || m_bShowStatus) return FALSE; m_ptCurrent = rCurrentPoint; m_bShowStatus = TRUE; //Show tool tip DisplayToolTip(rCurrentPoint); return TRUE; } //Close the tooltip void CToolTip2::Close() { ASSERT(this != NULL ); ASSERT(m_hWnd != NULL ); ShowWindow(SW_HIDE); //Hide tooltip m_bShowStatus = FALSE; } void CToolTip2::OnPaint() { CPaintDC dc(this); DisplayToolTip(m_ptCurrent); } //Display tooltip void CToolTip2::DisplayToolTip(const CPoint& rCurrentPoint) { CDC* pDC = GetDC(); CBrush *pOldBrush; CFont *pOldFont; pOldFont = pDC->SelectObject(&m_font); //CSize size = pDC->GetTextExtent(m_szText); //pDC->LPtoDP(&size); int x = 0; int nLargest = 0; CString sLine; CSize size; while(GetLine(m_szText, &sLine, x)) { size = pDC->GetTextExtent(sLine); pDC->LPtoDP(&size); if(size.cx > nLargest) nLargest = size.cx; x++; } int nHeight = size.cy; size.cx = nLargest; size.cy *= x; //Form tooltip rectangle CRect rectToolTip(rCurrentPoint.x, rCurrentPoint.y, rCurrentPoint.x+size.cx+7, rCurrentPoint.y+size.cy+2); //Draw Tooltip Rect and Text // pDC->SetBkMode(TRANSPARENT); CBrush brushToolTip(GetSysColor(COLOR_INFOBK)); pOldBrush = pDC->SelectObject(&brushToolTip); //Create and select thick black pen CPen penBlack(PS_SOLID, 0, COLORREF(RGB(0, 0, 0))); CPen* pOldPen = pDC->SelectObject(&penBlack); //Draw rectangle filled with COLOR_INFOBK pDC->Rectangle(0,0,rectToolTip.Width(),rectToolTip.Height()); //Draw tooltip text pDC->SetTextColor( GetSysColor(COLOR_INFOTEXT) );//Tool Tip color set in control panel settings pDC->SetTextAlign(TA_LEFT); //pDC->TextOut(3,1, m_szText); x = 0; while(GetLine(m_szText, &sLine, x)) { pDC->TextOut(3,1 + (x * nHeight), sLine); x++; } CRect rectWnd = rectToolTip; m_pParentWnd->ClientToScreen(rectWnd); //Convert from client to screen coordinates CPoint ptToolTipLeft = rectWnd.TopLeft(); //Now display tooltip SetWindowPos(&wndTop,ptToolTipLeft.x+1, ptToolTipLeft.y+1, rectWnd.Width(), rectWnd.Height(),SWP_SHOWWINDOW|SWP_NOOWNERZORDER|SWP_NOACTIVATE); //put back old objects pDC->SelectObject(pOldBrush); pDC->SelectObject(pOldPen); pDC->SelectObject(pOldFont); ReleaseDC(pDC); } BOOL CToolTip2::GetLine(CString sSource, CString *sDest, int nLineNumber) { int x = 0; int nStart = 0; while(x < nLineNumber) { nStart = sSource.Find('\n', nStart) + 1; if(nStart == 0) { (*sDest) = sSource; return FALSE; } x++; } // go from the offset, to the next \n or end of // string int nEnd = sSource.Find('\n', nStart); if(nEnd == -1) nEnd = sSource.GetLength(); (*sDest) = sSource.Mid(nStart, nEnd - nStart); return TRUE; }