logscrollview.h

VC技术内幕 很不错的一本书

// LogScrollView.h : interface of the LogScrollView class
//
/////////////////////////////////////////////////////////////////////////////
#ifndef _LOG_TWIPS_SCROLL_VIEW 
#define _LOG_TWIPS_SCROLL_VIEW 

#define CX_BORDER   1
#define CY_BORDER   1

class CLogScrollView : public CView
{
	DECLARE_DYNAMIC(CLogScrollView)

// Constructors
protected:
	CLogScrollView();

public:
	void SetLogScrollSizes(SIZE sizeTotal); // in logical units

// Attributes
public:
	CPoint GetScrollPosition() const;       // upper corner of scrolling
	CSize GetTotalSize() const;             // logical size

	// for device units
	CPoint GetDeviceScrollPosition() const;

// Operations
public:
	void ScrollToPosition(POINT pt);    // set upper left position
	void FillOutsideRect(CDC* pDC, CBrush* pBrush);
	void ResizeParentToFit(BOOL bShrinkOnly = TRUE);

// Implementation
protected:
	CSize m_totalLog;           // total size in logical units (no rounding)
	CSize m_totalDev;           // total size in device units
	CSize m_pageDev;            // per page scroll size in device units
	CSize m_lineDev;            // per line scroll size in device units

	BOOL m_bCenter;             // Center output if larger than total size
	BOOL m_bInsideUpdate;       // internal state for OnSize callback
	void CenterOnPoint(CPoint ptCenter);
	void ScrollToDevicePosition(POINT ptDev); // explicit scrolling no checking

protected:
	virtual void OnDraw(CDC* pDC) = 0;      // pass on pure virtual

	void UpdateBars();          // adjust scrollbars etc
	BOOL GetTrueClientSize(CSize& size, CSize& sizeSb);
		// size with no bars
	void GetScrollBarSizes(CSize& sizeSb);
	void GetScrollBarState(CSize sizeClient, CSize& needSb,
		CSize& sizeRange, CPoint& ptMove, BOOL bInsideClient);

public:
	virtual ~CLogScrollView();
#ifdef _DEBUG
	virtual void Dump(CDumpContext&) const;
#endif //_DEBUG
	virtual void CalcWindowRect(LPRECT lpClientRect,
		UINT nAdjustType = adjustBorder);
	virtual void OnPrepareDC(CDC* pDC, CPrintInfo* pInfo = NULL);

	// scrolling implementation support for OLE
	virtual BOOL OnScroll(UINT nScrollCode, UINT nPos, BOOL bDoScroll = TRUE);
	virtual BOOL OnScrollBy(CSize sizeScroll, BOOL bDoScroll = TRUE);

	//{{AFX_MSG(CLogScrollView)
	afx_msg void OnSize(UINT nType, int cx, int cy);
	afx_msg void OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar);
	afx_msg void OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar);
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};
#endif _LOG_TWIPS_SCROLL_VIEW