ScrollZoomView.h

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/*

  Custom ScrollView class by Peter

*/

#if !defined(AFX_SROLLZOOMVIEW_H__4110C3CC_05C2_4E15_A035_0A8F39EF36A1__INCLUDED_)
#define AFX_SROLLZOOMVIEW_H__4110C3CC_05C2_4E15_A035_0A8F39EF36A1__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// SrollZoomView.h : header file
//

// class CScrollZoomView supports simple scrolling and scaling

class CScrollZoomView : public CView
{
        DECLARE_DYNAMIC(CScrollZoomView)

// Constructors
protected:
        CScrollZoomView();

        static UINT uCachedScrollLines;
        static bool bScrollLinesRequested;

public:
        // used to specify default calculated page and line sizes
        static AFX_DATA const SIZE sizeDefault;

        static UINT GetMouseScrollLines(void);

        // in logical units - call one of the following Set routines
        void SetScaleToFitSize(SIZE sizeTotal);
        void SetScrollSizes(int nMapMode, SIZE sizeTotal, int scalePercent,
                                const SIZE& sizePage = sizeDefault,
                                const SIZE& sizeLine = sizeDefault);

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

        // for device units
        CPoint GetDeviceScrollPosition() const;
        void GetDeviceScrollSizes(int& nMapMode, SIZE& sizeTotal, SIZE& sizePage, SIZE& sizeLine) const;

// Operations
public:
        void ScrollToPosition(POINT pt);    // set upper left position
        void FillOutsideRect(CDC* pDC, CBrush* pBrush);
        void ResizeParentToFit(BOOL bShrinkOnly = TRUE);
        BOOL DoMouseWheel(UINT fFlags, short zDelta, CPoint point);

        void notifyPanning(CPoint pt);

// Implementation
protected:
        bool m_zoomScroll;
        CPoint m_zoomP;
        bool m_noHscroll; // hack terge
        bool m_noVscroll; // hack terge

        int m_nMapMode;
        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
        int       m_scalePercent;               // Modified by Peter

        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 ~CScrollZoomView();
#ifdef _DEBUG
        virtual void Dump(CDumpContext&) const;
        virtual void AssertValid() 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(CScrollZoomView)
        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 BOOL OnMouseWheel(UINT fFlags, short zDelta, CPoint point);
        //}}AFX_MSG
        DECLARE_MESSAGE_MAP()
};

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_SROLLZOOMVIEW_H__4110C3CC_05C2_4E15_A035_0A8F39EF36A1__INCLUDED_)