www.pudn.com > DrawGrInDlg.rar > ScrollDialog.cpp

// ScrollDialog.cpp : implementation file 
// 
#include "stdafx.h" 
//#include "resource.h" 
#include "ScrollDialog.h" 
 
#ifdef _DEBUG 
#define new DEBUG_NEW 
#undef THIS_FILE 
static char THIS_FILE[] = __FILE__; 
#endif 
 
///////////////////////////////////////////////////////////////////////////// 
// CScrollDialog dialog 
#define HORZ_PTS 8 
#define VERT_PTS 4 
 
CScrollDialog::CScrollDialog(UINT nIDD,CWnd* pParent /*=NULL*/) 
	: CDialog(nIDD, pParent) 
{ 
	//{{AFX_DATA_INIT(CScrollDialog) 
		// NOTE: the ClassWizard will add member initialization here 
	//}}AFX_DATA_INIT 
} 
 
 
void CScrollDialog::DoDataExchange(CDataExchange* pDX) 
{ 
	CDialog::DoDataExchange(pDX); 
	//{{AFX_DATA_MAP(CScrollDialog) 
		// NOTE: the ClassWizard will add DDX and DDV calls here 
	//}}AFX_DATA_MAP 
} 
 
 
BEGIN_MESSAGE_MAP(CScrollDialog, CDialog) 
	//{{AFX_MSG_MAP(CScrollDialog) 
	ON_WM_VSCROLL() 
	ON_WM_HSCROLL() 
	//}}AFX_MSG_MAP 
END_MESSAGE_MAP() 
 
///////////////////////////////////////////////////////////////////////////// 
// CScrollDialog message handlers 
 
void CScrollDialog::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)  
{ 
    int nInc; 
    switch (nSBCode) 
    { 
        case SB_TOP:        nInc = -m_nVscrollPos;               break; 
        case SB_BOTTOM:     nInc = m_nVscrollMax-m_nVscrollPos;  break; 
        case SB_LINEUP:     nInc = -1;                           break; 
        case SB_LINEDOWN:   nInc = 1;                            break; 
        case SB_PAGEUP:     nInc = min(-1, -m_nVertInc);         break; 
        case SB_PAGEDOWN:   nInc = max(1, m_nVertInc);           break; 
        case SB_THUMBTRACK: nInc = nPos - m_nVscrollPos;         break; 
        default:            nInc = 0; 
    } 
 
    nInc = max(-m_nVscrollPos, min(nInc, m_nVscrollMax - m_nVscrollPos)); 
 
    if (nInc) 
    { 
        m_nVscrollPos += nInc; 
        int iMove = -VERT_PTS * nInc; 
		ScrollWindowEx(0,iMove, 
			NULL,NULL,NULL,NULL, 
			SW_SCROLLCHILDREN|SW_INVALIDATE); 
        SetScrollPos(SB_VERT, m_nVscrollPos, TRUE); 
    } 
	InvalidateRect(NULL); 
 
	CDialog::OnVScroll(nSBCode, nPos, pScrollBar); 
} 
 
BOOL CScrollDialog::OnInitDialog()  
{ 
	CRect m_WindowRect; 
	GetWindowRect(&m_WindowRect); 
	//Get Dialog temp's size,must be before CDialog::OnInitDialog()  
	CDialog::OnInitDialog(); 
 
	m_nHscrollPos = 0; 
    m_nVscrollPos = 0; 
	 
	CRect tempRect; 
    if(GetParent()) 
		GetParent()->GetClientRect(&tempRect); 
	else 
		GetClientRect(&tempRect); 
 
    // Calculate how many scrolling increments for the client area 
	int sx=GetSystemMetrics(SM_CXHSCROLL); 
	int sy=GetSystemMetrics(SM_CYVSCROLL); 
	int WinWidth = m_WindowRect.right+m_WindowRect.left; 
	int WinHeight = m_WindowRect.bottom+m_WindowRect.top; 
 
	if(WinWidth <= tempRect.Width()) 
		m_nHorzInc = (WinWidth - tempRect.Width())/HORZ_PTS; 
	else 
		m_nHorzInc = (WinWidth+sx - tempRect.Width())/HORZ_PTS; 
	if(WinHeight <= tempRect.Height()) 
		m_nVertInc = (WinHeight+sy - tempRect.Height())/VERT_PTS; 
	else 
		m_nVertInc = (WinHeight - tempRect.Height())/VERT_PTS; 
 
    // Set the vertical and horizontal scrolling info 
    m_nHscrollMax = max(0, m_nHorzInc); 
    m_nHscrollPos = min (m_nHscrollPos, m_nHscrollMax); 
    SetScrollRange(SB_HORZ, 0, m_nHscrollMax, FALSE); 
    SetScrollPos(SB_HORZ, m_nHscrollPos, TRUE); 
    m_nVscrollMax = max(0, m_nVertInc); 
    m_nVscrollPos = min(m_nVscrollPos, m_nVscrollMax); 
    SetScrollRange(SB_VERT, 0, m_nVscrollMax, FALSE); 
    SetScrollPos(SB_VERT, m_nVscrollPos, TRUE); 
 
	return TRUE;  // return TRUE unless you set the focus to a control 
	              // EXCEPTION: OCX Property Pages should return FALSE 
} 
 
void CScrollDialog::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)  
{ 
    int nInc; 
    switch (nSBCode) 
    { 
        case SB_TOP:        nInc = -m_nHscrollPos;               break; 
        case SB_BOTTOM:     nInc = m_nHscrollMax-m_nHscrollPos;  break; 
        case SB_LINEUP:     nInc = -1;                           break; 
        case SB_LINEDOWN:   nInc = 1;                            break; 
        case SB_PAGEUP:     nInc = -HORZ_PTS;                    break; 
        case SB_PAGEDOWN:   nInc = HORZ_PTS;                     break; 
        case SB_THUMBTRACK: nInc = nPos - m_nHscrollPos;         break; 
        default:            nInc = 0; 
 
    } 
 
    nInc = max(-m_nHscrollPos, min(nInc, m_nHscrollMax - m_nHscrollPos)); 
 
    if (nInc) 
    { 
        m_nHscrollPos += nInc; 
        int iMove = -HORZ_PTS * nInc; 
        ScrollWindowEx(iMove,0, 
			NULL,NULL,NULL,NULL, 
			SW_SCROLLCHILDREN|SW_INVALIDATE); 
		SetScrollPos(SB_HORZ, m_nHscrollPos, TRUE); 
    }	 
	InvalidateRect(NULL); 
	CDialog::OnHScroll(nSBCode, nPos, pScrollBar); 
} 
//This Function achieve scroll the compenents on dialog . 
//It's written by MicroSoft in file named dlgcore.cpp 
//The Function named ScrollWindow(...) can NOT work,But  
//ScrollWindowEx(...) work well 
void CScrollDialog::ScrollContent(int xAmount, int yAmount) 
{ 
	HWND hWndChild = ::GetWindow(m_hWnd, GW_CHILD); 
	if (hWndChild != NULL) 
	{ 
		for (; hWndChild != NULL; 
			hWndChild = ::WCE_FCTN(GetNextWindow)(hWndChild, GW_HWNDNEXT)) 
		{ 
			CRect rect; 
			::GetWindowRect(hWndChild, &rect); 
			ScreenToClient(&rect); 
			::SetWindowPos(hWndChild, NULL, 
				rect.left+xAmount, rect.top+yAmount, 0, 0, 
				SWP_NOSIZE|SWP_NOACTIVATE|SWP_NOZORDER); 
		} 
	} 
}