CFreeView继承自CScrollView

// FreeViewDemoView.cpp : implementation of the CFreeViewDemoView class // #include "stdafx.h" #include "FreeViewDemo.h" #include "FreeViewDemoDoc.h" #include "FreeViewDemoView.h" #ifdef _DEBUG #define new DEBUG_NEW #endif // CFreeViewDemoView IMPLEMENT_DYNCREATE(CFreeViewDemoView, CScrollView) BEGIN_MESSAGE_MAP(CFreeViewDemoView, CScrollView) ON_WM_CREATE() ON_WM_MOUSEMOVE() ON_WM_LBUTTONUP() ON_WM_SIZE() END_MESSAGE_MAP() // CFreeViewDemoView construction/destruction CFreeViewDemoView::CFreeViewDemoView() { // TODO: add construction code here m_pDargButton = NULL; } CFreeViewDemoView::~CFreeViewDemoView() { } BOOL CFreeViewDemoView::PreCreateWindow(CREATESTRUCT& cs) { // TODO: Modify the Window class or styles here by modifying // the CREATESTRUCT cs return CScrollView::PreCreateWindow(cs); } // CFreeViewDemoView drawing void CFreeViewDemoView::OnDraw(CDC* /*pDC*/) { CFreeViewDemoDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); if (!pDoc) return; // TODO: add draw code for native data here } void CFreeViewDemoView::OnInitialUpdate() { // CScrollView::OnInitialUpdate(); AdjustViewFitButtons(); } // CFreeViewDemoView diagnostics #ifdef _DEBUG void CFreeViewDemoView::AssertValid() const { CScrollView::AssertValid(); } void CFreeViewDemoView::Dump(CDumpContext& dc) const { CScrollView::Dump(dc); } CFreeViewDemoDoc* CFreeViewDemoView::GetDocument() const // non-debug version is inline { ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CFreeViewDemoDoc))); return (CFreeViewDemoDoc*)m_pDocument; } #endif //_DEBUG // CFreeViewDemoView message handlers int CFreeViewDemoView::OnCreate(LPCREATESTRUCT lpCreateStruct) { if (CScrollView::OnCreate(lpCreateStruct) == -1) return -1; CRect rect(100, 100, 180, 130); for (int i = 0; i < _countof(m_wndButton); i++) { m_wndButton[i].Create(_T("Darg me"), WS_CHILD | WS_VISIBLE, rect, this, 123); rect.left += 100; rect.right += 100; } return 0; } void CFreeViewDemoView::OnButtonMoved( CRect& rect ) { SCROLLINFO si = {sizeof(SCROLLINFO), SIF_RANGE | SIF_POS | SIF_PAGE}; CRect rectView = m_rectView; CRect rectWnd; GetClientRect(&rectWnd); rectView |= rectWnd; rectView |= rect; CSize sizeClient = rectWnd.Size(); CSize sizeSb; GetScrollBarSizes(sizeSb); CSize sizeView = rectView.Size(); // 计算是否有滚动条 BOOL bNeedH = sizeView.cx > sizeClient.cx; if (bNeedH) { sizeClient.cy -= sizeSb.cy; if (m_rectView.bottom <= sizeClient.cy) sizeView.cy -= sizeSb.cy; } BOOL bNeedV = sizeView.cy > sizeClient.cy; if (bNeedV) { sizeClient.cx -= sizeSb.cx; if (m_rectView.right <= sizeClient.cx) sizeView.cx -= sizeSb.cx; if (!bNeedH) { bNeedH = sizeView.cx > sizeClient.cx; if (bNeedH) { sizeClient.cy -= sizeSb.cy; if (m_rectView.bottom <= sizeClient.cy) sizeView.cy -= sizeSb.cy; } } } // 更新滚动条 ShowScrollBar(SB_HORZ, bNeedH); if (bNeedH) { si.nPage = sizeClient.cx; si.nMax = sizeView.cx - 1; si.nPos = -rectView.left; SetScrollInfo(SB_HORZ, &si, TRUE); } ShowScrollBar(SB_VERT, bNeedV); if (bNeedV) { si.nPage = sizeClient.cy; si.nMax = sizeView.cy - 1; si.nPos = -rectView.top; SetScrollInfo(SB_VERT, &si, TRUE); } } void CFreeViewDemoView::OnBeginDargButton( CDargButton* pBtn, CPoint point ) { m_pDargButton = pBtn; m_pointDarg = point; m_rectView.SetRectEmpty(); CRect rect; for (int i = 0; i < _countof(m_wndButton); i++) { if (&m_wndButton[i] != pBtn) { m_wndButton[i].GetWindowRect(&rect); ScreenToClient(&rect); m_rectView |= rect; } } SetCapture(); } void CFreeViewDemoView::OnMouseMove(UINT nFlags, CPoint point) { if (m_pDargButton) { CRect rect; m_pDargButton->GetClientRect(&rect); rect.MoveToXY(point.x - m_pointDarg.x, point.y - m_pointDarg.y); OnButtonMoved(rect); m_pDargButton->SetWindowPos(NULL, rect.left, rect.top, 0, 0, SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE | SWP_NOSENDCHANGING); } CScrollView::OnMouseMove(nFlags, point); } void CFreeViewDemoView::OnLButtonUp(UINT nFlags, CPoint point) { if (GetCapture() == this) ReleaseCapture(); m_pDargButton = NULL; // 在拖动时已经调整，不需要再调 //AdjustViewFitButtons(); CScrollView::OnLButtonUp(nFlags, point); } void CFreeViewDemoView::AdjustViewFitButtons() { CRect rectView(0, 0, 0, 0), rect; for (int i = 0; i < _countof(m_wndButton); i++) { m_wndButton[i].GetWindowRect(&rect); ScreenToClient(&rect); rectView |= rect; } rectView.left = -GetScrollPos(SB_HORZ); rectView.top = -GetScrollPos(SB_VERT); SetScrollSizes(MM_TEXT, rectView.Size()); } void CFreeViewDemoView::OnSize(UINT nType, int cx, int cy) { if (m_pDargButton) return; CScrollView::OnSize(nType, cx, cy); }