文本编辑器<二>滚动条

来源：互联网发布：c语言日期转时间戳编辑：程序博客网时间：2024/04/30 22:49

关键函数OnSize获取Client的x,y范围

void CMyEditorView::OnSize(UINT nType, int cx, int cy){CView::OnSize(nType, cx, cy);cxClient = cx;cyClient = cy;}

关键函数OnPaint进行绘制

void CMyEditorView::OnPaint(){CPaintDC pdc(this);const int FIRST_X  = 0;const int SECOND_X = 5*cxCaps;const int THIRD_X  = 20*cxCaps;const int FORTH_X  = 20*cxCaps + 40*cxChar;for (int i = iVscrollPos ; i < NUMLINES ; i++){TCHAR                szBuffer [10] ;int y = cyChar * (i-iVscrollPos);TextOut(pdc, FIRST_X,  y,   szBuffer,wsprintf(szBuffer,TEXT("%5d"),i-iVscrollPos)) ;TextOut(pdc, SECOND_X, y,   sysmetrics[i].szLabel,lstrlen (sysmetrics[i].szLabel)) ;TextOut(pdc, THIRD_X,  y,   sysmetrics[i].szDesc,lstrlen (sysmetrics[i].szDesc)) ;SetTextAlign (pdc, TA_RIGHT | TA_TOP);TextOut(pdc, FORTH_X,  y,   szBuffer,wsprintf (szBuffer, TEXT ("%5d"),                            GetSystemMetrics (sysmetrics[i].index))) ;SetTextAlign (pdc, TA_LEFT | TA_TOP) ;}}

关键函数OnVscroll获取滚动条事件

void CMyEditorView::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar){switch(nSBCode){case SB_THUMBTRACK:iVscrollPos = nPos;break;case SB_PAGEDOWN:iVscrollPos += cyClient/cyChar;break;case SB_PAGEUP:iVscrollPos -= cyClient/cyChar;break;}iVscrollPos = max(0,min(iVscrollPos,NUMLINES-1));if(iVscrollPos != GetScrollPos(SB_VERT)){SetScrollPos(SB_VERT,iVscrollPos,TRUE);RECT rect;GetClientRect(&rect);InvalidateRect(&rect);}CView::OnVScroll(nSBCode, nPos, pScrollBar);}