MFC应用CStatic派生带滚动条的图片控件类

// ScrollBitmapWnd.cpp : implementation file // #include "stdafx.h" #include "ScrollBitmapWnd.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // CScrollBitmapWnd CScrollBitmapWnd::CScrollBitmapWnd() { m_bVScrollShow = false; m_bHScrollShow = false; m_bDraw = false; m_offsetx = 0; m_offsety = 0; m_PicSize = CSize(0,0); m_clickPoint = CPoint(0,0); m_scrollSize = 17; } CScrollBitmapWnd::~CScrollBitmapWnd() { m_dcMem.DeleteDC(); m_BackBitmap.DeleteObject(); } BEGIN_MESSAGE_MAP(CScrollBitmapWnd, CStatic) //{{AFX_MSG_MAP(CScrollBitmapWnd) ON_WM_PAINT() ON_WM_ERASEBKGND() ON_WM_HSCROLL() ON_WM_VSCROLL() ON_WM_SIZE() ON_WM_CREATE() ON_WM_LBUTTONDOWN() //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CScrollBitmapWnd message handlers bool CScrollBitmapWnd::setBitmap(HBITMAP bitMap) { m_dcMem.DeleteDC(); m_BackBitmap.DeleteObject(); if(!m_BackBitmap.Attach(bitMap)) { m_BackBitmap.DeleteObject(); return false; } m_BackBitmap.GetBitmap(&m_bitMap); BITMAP bm; m_BackBitmap.GetBitmap(&bm); m_PicSize.cx = bm.bmWidth; m_PicSize.cy = bm.bmHeight; if(!m_dcMem.CreateCompatibleDC(NULL)) { m_dcMem.DeleteDC(); m_BackBitmap.DeleteObject(); return false; } // if (!m_BackBitmap.CreateBitmapIndirect(&m_bitMap)) // { // m_BackBitmap.DeleteObject(); // m_dcMem.DeleteDC(); // m_bDraw = false; // return false; // } // // m_BackBitmap.GetBitmap(&m_bitMap); // // int lpLenth = m_bitMap.bmWidthBytes*nHeight*sizeof(BYTE); // BYTE *Templp = (BYTE *) malloc(lpLenth); // // bitMap->GetBitmapBits(lpLenth,Templp); // m_BackBitmap.SetBitmapBits(lpLenth,Templp); // // if (Templp) // { // free(Templp); // } m_dcMem.SelectObject(&m_BackBitmap); m_bDraw = true; refLayOut(); return true; } void CScrollBitmapWnd::refLayOut() { CRect rect; GetClientRect(&rect); m_bHScrollShow = false; m_bVScrollShow = false; int nPageSize; if (m_PicSize.cx>rect.Size().cx) { m_bHScrollShow = true; if (m_PicSize.cy>rect.Size().cy-m_scrollSize) { m_bVScrollShow = true; } } if(m_PicSize.cy>rect.Size().cy) { m_bVScrollShow = true; if (m_PicSize.cx>rect.Size().cx-m_scrollSize) { m_bHScrollShow = true; } } m_horz.cbSize = sizeof(SCROLLINFO); m_horz.fMask = SIF_ALL; m_horz.nMin = 0; m_horz.nMax = m_PicSize.cx; nPageSize = rect.Size().cx; if (m_bVScrollShow) { nPageSize = rect.Size().cx - m_scrollSize;; } m_horz.nPage = nPageSize; m_horz.nPos = 0; m_horz.nTrackPos=0; m_vert.cbSize = sizeof(SCROLLINFO); m_vert.fMask = SIF_ALL; m_vert.nMin = 0; m_vert.nMax = m_PicSize.cy; nPageSize = rect.Size().cy; if (m_bHScrollShow) { nPageSize = rect.Size().cy - m_scrollSize; } m_vert.nPage = nPageSize; m_vert.nPos = 0; m_vert.nTrackPos=0; m_HScroll.ShowWindow(m_bHScrollShow); m_VScroll.ShowWindow(m_bVScrollShow); if (m_bVScrollShow && m_bHScrollShow) { rect.right = rect.right - m_scrollSize; rect.bottom = rect.bottom - m_scrollSize; } else if (m_bHScrollShow) { rect.bottom = rect.bottom - m_scrollSize; } else if (m_bVScrollShow) { rect.right = rect.right - m_scrollSize; } int offsx,offsy; offsx = m_rectStaticClient.Size().cx - rect.Size().cx; offsy = m_rectStaticClient.Size().cy - rect.Size().cy; if (0 > offsx) { m_offsetx = m_offsetx + offsx; } if (0 > offsy) { m_offsety = m_offsety + offsy; } m_offsetx = m_offsetx>0 ? m_offsetx:0; m_offsety = m_offsety>0 ? m_offsety:0; int nMax; nMax = (m_PicSize.cx-m_rectStaticClient.Size().cx)>0 ? (m_PicSize.cx-m_rectStaticClient.Size().cx):0; m_offsetx = m_offsetx<nMax ? m_offsetx:nMax; nMax = (m_PicSize.cy-m_rectStaticClient.Size().cy)>0 ? (m_PicSize.cy-m_rectStaticClient.Size().cy):0; m_offsety = m_offsety<nMax ? m_offsety:nMax; if (!m_bHScrollShow) { m_offsetx = 0; } if (!m_bVScrollShow) { m_offsety = 0; } m_VScroll.MoveWindow(rect.Size().cx,0,m_scrollSize,rect.Size().cy); m_VScroll.SetScrollInfo(&m_vert); m_VScroll.SetScrollPos(m_offsety); m_HScroll.MoveWindow(0,rect.Size().cy,rect.Size().cx,m_scrollSize); m_HScroll.SetScrollInfo(&m_horz); m_HScroll.SetScrollPos(m_offsetx); m_rectStaticClient = rect; } void CScrollBitmapWnd::OnPaint() { CPaintDC dc(this); // device context for painting // TODO: Add your message handler code here if (m_bDraw) { dc.BitBlt(0,0, m_rectStaticClient.Size().cx, m_rectStaticClient.Size().cy, &m_dcMem, m_offsetx, m_offsety, SRCCOPY); } // Do not call CStatic::OnPaint() for painting messages } BOOL CScrollBitmapWnd::OnEraseBkgnd(CDC* pDC) { // TODO: Add your message handler code here and/or call default CRect rect; GetClientRect(&rect); COLORREF color; color = pDC->GetBkColor(); //限制绘图区域 CRgn rgn,rgnStatic; rgn.CreateRectRgn(0,0,m_PicSize.cx,m_PicSize.cy); rgnStatic.CreateRectRgnIndirect(&m_rectStaticClient); pDC->SelectClipRgn(&rgnStatic); pDC->SelectClipRgn(&rgn,RGN_DIFF); //滚动条的右下角位置 if (m_bHScrollShow && m_bVScrollShow) { CRgn rgnScroll; CRect scrollRect; scrollRect.left = rect.right - m_scrollSize; scrollRect.right = rect.right; scrollRect.top = rect.bottom - m_scrollSize; scrollRect.bottom = rect.bottom; rgnScroll.CreateRectRgnIndirect(&scrollRect); pDC->SelectClipRgn(&rgnScroll,RGN_OR); } pDC->FillSolidRect( &rect,RGB(192,192,192)); pDC->SelectClipRgn(NULL); pDC->SetBkColor(color); return true; } void CScrollBitmapWnd::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) { // TODO: Add your message handler code here and/or call default switch (nSBCode) { case SB_LINELEFT: m_offsetx -= 5; break; case SB_LINERIGHT: m_offsetx += 5; break; case SB_TOP: m_offsetx = 0; break; case SB_BOTTOM: m_offsetx = INT_MAX; break; case SB_THUMBTRACK: m_offsetx = nPos; break; } m_offsetx = m_offsetx>0 ? m_offsetx:0; int nMax = m_PicSize.cx-m_rectStaticClient.Size().cx; m_offsetx = m_offsetx<nMax ? m_offsetx:nMax; m_HScroll.SetScrollPos(m_offsetx); InvalidateRect(&m_rectStaticClient); CStatic::OnHScroll(nSBCode, nPos, pScrollBar); } void CScrollBitmapWnd::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) { // TODO: Add your message handler code here and/or call default switch (nSBCode) { case SB_LINEUP: m_offsety -= 5; break; case SB_LINEDOWN: m_offsety += 5; break; case SB_TOP: m_offsety = 0; break; case SB_BOTTOM: m_offsety = INT_MAX; break; case SB_THUMBTRACK: m_offsety = nPos; break; } m_offsety = m_offsety>0 ? m_offsety:0; int nMax = m_PicSize.cy-m_rectStaticClient.Size().cy; m_offsety = m_offsety<nMax ? m_offsety:nMax; m_VScroll.SetScrollPos(m_offsety); InvalidateRect(&m_rectStaticClient); CStatic::OnVScroll(nSBCode, nPos, pScrollBar); } void CScrollBitmapWnd::OnSize(UINT nType, int cx, int cy) { CStatic::OnSize(nType, cx, cy); // TODO: Add your message handler code here refLayOut(); Invalidate(); } int CScrollBitmapWnd::OnCreate(LPCREATESTRUCT lpCreateStruct) { if (CStatic::OnCreate(lpCreateStruct) == -1) return -1; // TODO: Add your specialized creation code here VERIFY(m_HScroll.Create( SBS_HORZ | SBS_TOPALIGN | WS_CHILD, CRect(5, 5, 100, 30), this, 100)); VERIFY(m_VScroll.Create( SBS_VERT | SBS_TOPALIGN | WS_CHILD, CRect(5, 5, 100, 30), this, 101)); m_VScroll.ShowWindow(false); m_HScroll.ShowWindow(false); return 0; } void CScrollBitmapWnd::OnLButtonDown(UINT nFlags, CPoint