ccrystaltextview.h

一个完整的编辑器的代码（很值得参考

////////////////////////////////////////////////////////////////////////////
//  File:       ccrystaltextview.h
//  Version:    1.0.0.0
//  Created:    29-Dec-1998
//
//  Author:     Stcherbatchenko Andrei
//  E-mail:     [e-mail]
//
//  Interface of the CCrystalTextView class, a part of Crystal Edit -
//  syntax coloring text editor.
//
//  You are free to use or modify this code to the following restrictions:
//  - Acknowledge me somewhere in your about box, simple "Parts of code by.."
//  will be enough. If you can't (or don't want to), contact me personally.
//  - LEAVE THIS HEADER INTACT
////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////
//  19-Jul-99
//      Ferdinand Prantl:
//  +   FEATURE: see cpps ...
//
//  ... it's being edited very rapidly so sorry for non-commented
//        and maybe "ugly" code ...
////////////////////////////////////////////////////////////////////////////

#if !defined(AFX_CCRYSTALTEXTVIEW_H__AD7F2F41_6CB3_11D2_8C32_0080ADB86836__INCLUDED_)
#define AFX_CCRYSTALTEXTVIEW_H__AD7F2F41_6CB3_11D2_8C32_0080ADB86836__INCLUDED_

#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000

#include "regexp.h"
#include "crystalparser.h"

////////////////////////////////////////////////////////////////////////////
// Forward class declarations

class CCrystalTextBuffer;
class CUpdateContext;


////////////////////////////////////////////////////////////////////////////
// CCrystalTextView class declaration

//  CCrystalTextView::FindText() flags
enum
{
  FIND_MATCH_CASE = 0x0001,
  FIND_WHOLE_WORD = 0x0002,
  FIND_REGEXP = 0x0004,
  FIND_DIRECTION_UP = 0x0010,
  REPLACE_SELECTION = 0x0100
};

//  CCrystalTextView::UpdateView() flags
enum
{
  UPDATE_HORZRANGE = 0x0001,  //  update horz scrollbar
  UPDATE_VERTRANGE = 0x0002, //  update vert scrollbar
  UPDATE_SINGLELINE = 0x0100,    //  single line has changed
  UPDATE_FLAGSONLY = 0x0200, //  only line-flags were changed

  UPDATE_RESET = 0x1000       //  document was reloaded, update all!
};

class EDITPADC_CLASS CCrystalTextView : public CView
  {
    DECLARE_DYNCREATE (CCrystalTextView)

	//BEGIN SW
	friend CCrystalParser;
	//END SW

protected:
    //  Search parameters
    BOOL m_bLastSearch;
    DWORD m_dwLastSearchFlags;
    LPTSTR m_pszLastFindWhat;
    BOOL m_bMultipleSearch;       // More search

private :
    BOOL m_bCursorHidden;

    //  Painting caching bitmap
    CBitmap *m_pCacheBitmap;

    //  Line/character dimensions
    int m_nLineHeight, m_nCharWidth;
    void CalcLineCharDim ();

    //  Text attributes
    int m_nTabSize;
    BOOL m_bViewTabs;
    BOOL m_bSelMargin;
    DWORD m_dwFlags;

    //  Amount of lines/characters that completely fits the client area
    int m_nScreenLines, m_nScreenChars;

    //BEGIN SW
    /**
    Contains for each line the number of sublines. If the line is not
    wrapped, the value for this line is 1. The value of a line is invalid,
    if it is -1.

    Must create pointer, because contructor uses AFX_ZERO_INIT_OBJECT to
    initialize the member objects. This would destroy a CArray object.
    */
    CArray<int, int> *m_panSubLines;
    //END SW

    int m_nMaxLineLength;
    int m_nIdealCharPos;

    BOOL m_bFocused;
    CPoint m_ptAnchor;
    LOGFONT m_lfBaseFont;
    CFont *m_apFonts[4];

    //  Parsing stuff
    DWORD *m_pdwParseCookies;
    int m_nParseArraySize;
    DWORD GetParseCookie (int nLineIndex);

    //  Pre-calculated line lengths (in characters)
    int m_nActualLengthArraySize;
    int *m_pnActualLineLength;

    BOOL m_bPreparingToDrag;
    BOOL m_bDraggingText;
    BOOL m_bDragSelection, m_bWordSelection, m_bLineSelection;
    UINT m_nDragSelTimer;

    CPoint m_ptDrawSelStart, m_ptDrawSelEnd;
    CPoint m_ptCursorPos, m_ptCursorLast;
    CPoint m_ptSelStart, m_ptSelEnd;
    void PrepareSelBounds ();

    //  Helper functions
    void ExpandChars (LPCTSTR pszChars, int nOffset, int nCount, CString & line);

    int ApproxActualOffset (int nLineIndex, int nOffset);
    void AdjustTextPoint (CPoint & point);
    void DrawLineHelperImpl (CDC * pdc, CPoint & ptOrigin, const CRect & rcClip,
                             LPCTSTR pszChars, int nOffset, int nCount);
    BOOL IsInsideSelBlock (CPoint ptTextPos);

    BOOL m_bBookmarkExist;        // More bookmarks

public :
    virtual void ResetView ();
    virtual int GetLineCount ();

protected :
    CPoint WordToRight (CPoint pt);
    CPoint WordToLeft (CPoint pt);

    bool m_bSingle;
    CImageList * m_pIcons;
    CCrystalTextBuffer *m_pTextBuffer;
    HACCEL m_hAccel;
    BOOL m_bVertScrollBarLocked, m_bHorzScrollBarLocked;
    CPoint m_ptDraggedTextBegin, m_ptDraggedTextEnd;
    void UpdateCaret ();
    void SetAnchor (const CPoint & ptNewAnchor);
    int GetMarginWidth ();
    bool IsValidTextPos (const CPoint &point);
    bool IsValidTextPosX (const CPoint &point);
    bool IsValidTextPosY (const CPoint &point);

    BOOL m_bShowInactiveSelection;
    //  [JRT]
    BOOL m_bDisableDragAndDrop;

    //BEGIN SW
    BOOL m_bWordWrap;
    CCrystalParser *m_pParser;
    //END SW

    CPoint ClientToText (const CPoint & point);
    CPoint TextToClient (const CPoint & point);
    void InvalidateLines (int nLine1, int nLine2, BOOL bInvalidateMargin = FALSE);
    int CalculateActualOffset (int nLineIndex, int nCharIndex);

    //  Printing
    int m_nPrintPages;
    int *m_pnPages;
    CFont *m_pPrintFont;
    int m_nPrintLineHeight;
    BOOL m_bPrintHeader, m_bPrintFooter;
    CRect m_ptPageArea, m_rcPrintArea;
    int PrintLineHeight (CDC * pdc, int nLine);
    void RecalcPageLayouts (CDC * pdc, CPrintInfo * pInfo);
    virtual void PrintHeader (CDC * pdc, int nPageNum);
    virtual void PrintFooter (CDC * pdc, int nPageNum);
    virtual void GetPrintHeaderText (int nPageNum, CString & text);
    virtual void GetPrintFooterText (int nPageNum, CString & text);

    //  Keyboard handlers
    void MoveLeft (BOOL bSelect);
    void MoveRight (BOOL bSelect);
    void MoveWordLeft (BOOL bSelect);
    void MoveWordRight (BOOL bSelect);
    void MoveUp (BOOL bSelect);
    void MoveDown (BOOL bSelect);
    void MoveHome (BOOL bSelect);
    void MoveEnd (BOOL bSelect);
    void MovePgUp (BOOL bSelect);
    void MovePgDn (BOOL bSelect);
    void MoveCtrlHome (BOOL bSelect);
    void MoveCtrlEnd (BOOL bSelect);

    void SelectAll ();
    void Copy ();

    BOOL IsSelection ();
    BOOL IsInsideSelection (const CPoint & ptTextPos);
    void GetSelection (CPoint & ptStart, CPoint & ptEnd);
    void SetSelection (const CPoint & ptStart, const CPoint & ptEnd);

    int m_nTopLine, m_nOffsetChar;
    //BEGIN SW
    /**
    The index of the subline that is the first visible line on the screen.
    */
    int m_nTopSubLine;
    //END SW
    BOOL m_bSmoothScroll;

    int GetLineHeight ();
	//BEGIN SW
	/**
	Returns the number of sublines the given line contains of.
	Allway "1", if word wrapping is disabled.

	@param nLineIndex Index of the line to get the subline count of.

	@return Number of sublines the given line contains of
	*/
	int GetSubLines( int nLineIndex );

	/**
	Converts the given character position for the given line into a point.

	After the call the x-member of the returned point contains the
	character position relative to the beginning of the subline. The y-member
	contains the zero based index of the subline relative to the line, the
	character position was given for.

	@param nLineIndex Zero based index of the line, nCharPos refers to.
	@param nCharPos The character position, the point shoult be calculated for.
	@param charPoint Reference to a point, which should receive the result.

	@return The character position of the beginning of the subline charPoint.y.
	*/
	int CharPosToPoint( int nLineIndex, int nCharPos, CPoint &charPoint );

	/**
	Converts the given cursor point for the given line to the character position
	for the given line.

	The y-member of the cursor position specifies the subline inside the given
	line, the cursor is placed on and the x-member specifies the cursor position
	(in character widths) relative to the beginning of that subline.

	@param nLineIndex Zero based index of the line the cursor position refers to.
	@param curPoint Position of the cursor relative to the line in sub lines and
		char widths.

	@return The character position the best matches the cursor position.
	*/
	int CursorPointToCharPos( int nLineIndex, const CPoint &curPoint );

	/**
	Converts the given cursor position to a text position.

	The x-member of the subLinePos parameter describes the cursor position in
	char widths relative to the beginning of the subline described by the
	y-member. The subline is the zero based number of the subline relative to
	the beginning of the text buffer.

	<p>
	The returned point contains a valid text position, where the y-member is
	the zero based index of the textline and the x-member is the character
	position inside this line.

	@param subLinePos The sublinebased cursor position
		(see text above for detailed description).
	@param textPos The calculated line and character position that best matches
		the cursor position (see text above for detailed descritpion).
	*/
	void SubLineCursorPosToTextPos( const CPoint &subLinePos, CPoint &textPos );

	/**
	Returns the character position relative to the given line, that matches
	the end of the given sub line.

	@param nLineIndex Zero based index of the line to work on.
	@param nSubLineOffset Zero based index of the subline inside the given line.