atlscrl.h

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		return 0;
	}

	LRESULT OnHScroll(UINT /*uMsg*/, WPARAM wParam, LPARAM /*lParam*/, BOOL& /*bHandled*/)
	{
		T* pT = static_cast<T*>(this);
		ATLASSERT(::IsWindow(pT->m_hWnd));
		pT->DoScroll(SB_HORZ, (int)(short)LOWORD(wParam), (int&)m_ptOffset.x, m_sizeAll.cx, m_sizePage.cx, m_sizeLine.cx);
		return 0;
	}

	LRESULT OnMouseWheel(UINT uMsg, WPARAM wParam, LPARAM /*lParam*/, BOOL& /*bHandled*/)
	{
		T* pT = static_cast<T*>(this);
		ATLASSERT(::IsWindow(pT->m_hWnd));

#if (_WIN32_WINNT >= 0x0400) || (_WIN32_WINDOWS > 0x0400) || defined(_WIN32_WCE)
		uMsg;
		int zDelta = (int)(short)HIWORD(wParam);
#else
		int zDelta = (uMsg == WM_MOUSEWHEEL) ? (int)(short)HIWORD(wParam) : (int)wParam;
#endif //!((_WIN32_WINNT >= 0x0400) || (_WIN32_WINDOWS > 0x0400) || defined(_WIN32_WCE))
		int nScrollCode = (m_nWheelLines == WHEEL_PAGESCROLL) ? ((zDelta > 0) ? SB_PAGEUP : SB_PAGEDOWN) : ((zDelta > 0) ? SB_LINEUP : SB_LINEDOWN);
		m_zDelta += zDelta;   // cumulative
		int zTotal = (m_nWheelLines == WHEEL_PAGESCROLL) ? abs(m_zDelta) : abs(m_zDelta) * m_nWheelLines;
		if((pT->GetStyle() & WS_VSCROLL) != 0)
		{
			for(short i = 0; i < zTotal; i += WHEEL_DELTA)
			{
				pT->DoScroll(SB_VERT, nScrollCode, (int&)m_ptOffset.y, m_sizeAll.cy, m_sizePage.cy, m_sizeLine.cy);
				pT->UpdateWindow();
			}
		}
		else		// can't scroll vertically, scroll horizontally
		{
			for(short i = 0; i < zTotal; i += WHEEL_DELTA)
			{
				pT->DoScroll(SB_HORZ, nScrollCode, (int&)m_ptOffset.x, m_sizeAll.cx, m_sizePage.cx, m_sizeLine.cx);
				pT->UpdateWindow();
			}
		}
		int nSteps = m_zDelta / WHEEL_DELTA;
		m_zDelta -= nSteps * WHEEL_DELTA;

		return 0;
	}

	LRESULT OnSettingChange(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
	{
		GetSystemSettings();
		return 0;
	}

	LRESULT OnSize(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM lParam, BOOL& bHandled)
	{
		T* pT = static_cast<T*>(this);
		ATLASSERT(::IsWindow(pT->m_hWnd));

		m_sizeClient.cx = GET_X_LPARAM(lParam);
		m_sizeClient.cy = GET_Y_LPARAM(lParam);

		SCROLLINFO si = { 0 };
		si.cbSize = sizeof(si);
		si.fMask = SIF_PAGE | SIF_POS;

		si.nPage = m_sizeClient.cx;
		si.nPos = m_ptOffset.x;
		pT->SetScrollInfo(SB_HORZ, &si, FALSE);

		si.nPage = m_sizeClient.cy;
		si.nPos = m_ptOffset.y;
		pT->SetScrollInfo(SB_VERT, &si, FALSE);

		bool bUpdate = false;
		int cxMax = m_sizeAll.cx - m_sizeClient.cx;
		int cyMax = m_sizeAll.cy - m_sizeClient.cy;
		int x = m_ptOffset.x;
		int y = m_ptOffset.y;
		if(m_ptOffset.x > cxMax)
		{
			bUpdate = true;
			x = (cxMax >= 0) ? cxMax : 0;
		}
		if(m_ptOffset.y > cyMax)
		{
			bUpdate = true;
			y = (cyMax >= 0) ? cyMax : 0;
		}
		if(bUpdate)
		{
			pT->ScrollWindowEx(m_ptOffset.x - x, m_ptOffset.y - y, m_uScrollFlags);
			SetScrollOffset(x, y, FALSE);
		}

		bHandled = FALSE;
		return 1;
	}

	LRESULT OnPaint(UINT /*uMsg*/, WPARAM wParam, LPARAM /*lParam*/, BOOL& /*bHandled*/)
	{
		T* pT = static_cast<T*>(this);
		ATLASSERT(::IsWindow(pT->m_hWnd));
		if(wParam != NULL)
		{
			CDCHandle dc = (HDC)wParam;
			dc.SetViewportOrg(-m_ptOffset.x, -m_ptOffset.y);
			pT->DoPaint(dc);
		}
		else
		{
			CPaintDC dc(pT->m_hWnd);
			dc.SetViewportOrg(-m_ptOffset.x, -m_ptOffset.y);
			pT->DoPaint(dc.m_hDC);
		}
		return 0;
	}

	// scrolling handlers
	LRESULT OnScrollUp(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
	{
		ScrollLineUp();
		return 0;
	}

	LRESULT OnScrollDown(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
	{
		ScrollLineDown();
		return 0;
	}

	LRESULT OnScrollPageUp(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
	{
		ScrollPageUp();
		return 0;
	}

	LRESULT OnScrollPageDown(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
	{
		ScrollPageDown();
		return 0;
	}

	LRESULT OnScrollTop(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
	{
		ScrollTop();
		return 0;
	}

	LRESULT OnScrollBottom(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
	{
		ScrollBottom();
		return 0;
	}

	LRESULT OnScrollLeft(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
	{
		ScrollLineLeft();
		return 0;
	}

	LRESULT OnScrollRight(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
	{
		ScrollLineRight();
		return 0;
	}

	LRESULT OnScrollPageLeft(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
	{
		ScrollPageLeft();
		return 0;
	}

	LRESULT OnScrollPageRight(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
	{
		ScrollPageRight();
		return 0;
	}

	LRESULT OnScrollAllLeft(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
	{
		ScrollAllLeft();
		return 0;
	}

	LRESULT OnScrollAllRight(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
	{
		ScrollAllRight();
		return 0;
	}

// Overrideables
	void DoPaint(CDCHandle /*dc*/)
	{
		// must be implemented in a derived class
		ATLASSERT(FALSE);
	}

// Implementation
	void DoScroll(int nType, int nScrollCode, int& cxyOffset, int cxySizeAll, int cxySizePage, int cxySizeLine)
	{
		T* pT = static_cast<T*>(this);
		RECT rect = { 0 };
		pT->GetClientRect(&rect);
		int cxyClient = (nType == SB_VERT) ? rect.bottom : rect.right;
		int cxyMax = cxySizeAll - cxyClient;

		if(cxyMax < 0)   // can't scroll, client area is bigger
			return;

		BOOL bUpdate = TRUE;
		int cxyScroll = 0;

		switch(nScrollCode)
		{
		case SB_TOP:		// top or all left
			cxyScroll = cxyOffset;
			cxyOffset = 0;
			break;
		case SB_BOTTOM:		// bottom or all right
			cxyScroll = cxyOffset - cxyMax;
			cxyOffset = cxyMax;
			break;
		case SB_LINEUP:		// line up or line left
			if(cxyOffset >= cxySizeLine)
			{
				cxyScroll = cxySizeLine;
				cxyOffset -= cxySizeLine;
			}
			else
			{
				cxyScroll = cxyOffset;
				cxyOffset = 0;
			}
			break;
		case SB_LINEDOWN:	// line down or line right
			if(cxyOffset < cxyMax - cxySizeLine)
			{
				cxyScroll = -cxySizeLine;
				cxyOffset += cxySizeLine;
			}
			else
			{
				cxyScroll = cxyOffset - cxyMax;
				cxyOffset = cxyMax;
			}
			break;
		case SB_PAGEUP:		// page up or page left
			if(cxyOffset >= cxySizePage)
			{
				cxyScroll = cxySizePage;
				cxyOffset -= cxySizePage;
			}
			else
			{
				cxyScroll = cxyOffset;
				cxyOffset = 0;
			}
			break;
		case SB_PAGEDOWN:	// page down or page right
			if(cxyOffset < cxyMax - cxySizePage)
			{
				cxyScroll = -cxySizePage;
				cxyOffset += cxySizePage;
			}
			else
			{
				cxyScroll = cxyOffset - cxyMax;
				cxyOffset = cxyMax;
			}
			break;
		case SB_THUMBTRACK:
			if(IsNoThumbTracking())
				break;
			// else fall through
		case SB_THUMBPOSITION:
			{
				SCROLLINFO si = { 0 };
				si.cbSize = sizeof(SCROLLINFO);
				si.fMask = SIF_TRACKPOS;
				if(pT->GetScrollInfo(nType, &si))
				{
					cxyScroll = cxyOffset - si.nTrackPos;
					cxyOffset = si.nTrackPos;
				}
			}
			break;
		case SB_ENDSCROLL:
		default:
			bUpdate = FALSE;
			break;
		}

		if(bUpdate && cxyScroll != 0)
		{
			pT->SetScrollPos(nType, cxyOffset, TRUE);
			if(nType == SB_VERT)
				pT->ScrollWindowEx(0, cxyScroll, m_uScrollFlags);
			else
				pT->ScrollWindowEx(cxyScroll, 0, m_uScrollFlags);
		}
	}

	int CalcLineOrPage(int nVal, int nMax, int nDiv)
	{
		if(nVal == 0)
		{
			nVal = nMax / nDiv;
			if(nVal < 1)
				nVal = 1;
		}
		else if(nVal > nMax)
			nVal = nMax;

		return nVal;
	}

	void GetSystemSettings()
	{
#ifndef _WIN32_WCE
#ifndef SPI_GETWHEELSCROLLLINES
		const UINT SPI_GETWHEELSCROLLLINES = 104;
#endif //!SPI_GETWHEELSCROLLLINES
		::SystemParametersInfo(SPI_GETWHEELSCROLLLINES, 0, &m_nWheelLines, 0);

#if !((_WIN32_WINNT >= 0x0400) || (_WIN32_WINDOWS > 0x0400))
		if(m_uMsgMouseWheel != 0)
			m_uMsgMouseWheel = ::RegisterWindowMessage(MSH_MOUSEWHEEL);

		HWND hWndWheel = FindWindow(MSH_WHEELMODULE_CLASS, MSH_WHEELMODULE_TITLE);
		if(::IsWindow(hWndWheel))
		{
			UINT uMsgScrollLines = ::RegisterWindowMessage(MSH_SCROLL_LINES);
			if(uMsgScrollLines != 0)
				m_nWheelLines = ::SendMessage(hWndWheel, uMsgScrollLines, 0, 0L);
		}
#endif //!((_WIN32_WINNT >= 0x0400) || (_WIN32_WINDOWS > 0x0400))
#endif //!_WIN32_WCE
	}

	bool IsScrollingChildren() const
	{
		return (m_dwExtendedStyle & SCRL_SCROLLCHILDREN) != 0;
	}

	bool IsErasingBackground() const
	{
		return (m_dwExtendedStyle & SCRL_ERASEBACKGROUND) != 0;
	}

	bool IsNoThumbTracking() const
	{
		return (m_dwExtendedStyle & SCRL_NOTHUMBTRACKING) != 0;
	}

#if (WINVER >= 0x0500)
	bool IsSmoothScroll() const
	{
		return (m_dwExtendedStyle & SCRL_SMOOTHSCROLL) != 0;
	}