/*
 * RichEdit - structures and constant
 *
 * Copyright 2004 by Krzysztof Foltman
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#ifndef __EDITSTR_H
#define __EDITSTR_H

#ifdef __i386__
extern const struct ITextHostVtbl itextHostStdcallVtbl;
#endif /* __i386__ */

typedef struct tagME_String
{
  WCHAR *szData;
  int nLen, nBuffer;
} ME_String;

typedef struct tagME_Style
{
  CHARFORMAT2W fmt;

  HFONT hFont; /* cached font for the style */
  TEXTMETRICW tm; /* cached font metrics for the style */
  int nRefs; /* reference count */
} ME_Style;

typedef enum {
  diInvalid,
  diTextStart, /* start of the text buffer */
  diParagraph, /* paragraph start */
  diCell, /* cell start */
  diRun, /* run (sequence of chars with the same character format) */
  diStartRow, /* start of the row (line of text on the screen) */
  diTextEnd, /* end of the text buffer */
  
  /********************* these below are meant for finding only *********************/
  diStartRowOrParagraph, /* 7 */
  diStartRowOrParagraphOrEnd,
  diRunOrParagraph,
  diRunOrStartRow,
  diParagraphOrEnd,
  diRunOrParagraphOrEnd, /* 12 */
} ME_DIType;

#define SELECTIONBAR_WIDTH 8

/******************************** run flags *************************/
#define MERF_STYLEFLAGS 0x0FFF
/* run contains non-text content, which has its own rules for wrapping, sizing etc */
#define MERF_GRAPHICS   0x001
/* run is a tab (or, in future, any kind of content whose size is dependent on run position) */
#define MERF_TAB        0x002
/* run is a cell boundary */
#define MERF_ENDCELL    0x004 /* v4.1 */

#define MERF_NONTEXT (MERF_GRAPHICS | MERF_TAB | MERF_ENDCELL)

/* run is splittable (contains white spaces in the middle or end) */
#define MERF_SPLITTABLE 0x001000
/* run starts with whitespaces */
#define MERF_STARTWHITE 0x002000
/* run ends with whitespaces */
#define MERF_ENDWHITE   0x004000
/* run is completely made of whitespaces */
#define MERF_WHITESPACE 0x008000
/* the "end of paragraph" run, contains 1 character */
#define MERF_ENDPARA    0x100000
/* forcing the "end of row" run, contains 1 character */
#define MERF_ENDROW     0x200000
/* run is hidden */
#define MERF_HIDDEN     0x400000
/* start of a table row has an empty paragraph that should be skipped over. */
#define MERF_TABLESTART 0x800000 /* v4.1 */

/* runs with any of these flags set cannot be joined */
#define MERF_NOJOIN (MERF_GRAPHICS|MERF_TAB|MERF_ENDPARA|MERF_ENDROW)
/* runs that don't contain real text */
#define MERF_NOTEXT (MERF_GRAPHICS|MERF_TAB|MERF_ENDPARA|MERF_ENDROW)

/* those flags are kept when the row is split */
#define MERF_SPLITMASK (~(0))

/******************************** para flags *************************/

/* this paragraph was already wrapped and hasn't changed, every change resets that flag */
#define MEPF_REWRAP   0x01
/* v4.1 */
#define MEPF_CELL     0x04 /* The paragraph is nested in a cell */
#define MEPF_ROWSTART 0x08 /* Hidden empty paragraph at the start of the row */
#define MEPF_ROWEND   0x10 /* Visible empty paragraph at the end of the row */

/******************************** structures *************************/

struct tagME_DisplayItem;

typedef struct tagME_Run
{
  ME_Style *style;
  struct tagME_Paragraph *para; /* ptr to the run's paragraph */
  int nCharOfs; /* relative to para's offset */
  int len;      /* length of run's text */
  int nWidth; /* width of full run, width of leading&trailing ws */
  int nFlags;
  int nAscent, nDescent; /* pixels above/below baseline */
  POINT pt; /* relative to para's position */
  REOBJECT *ole_obj; /* FIXME: should be a union with strText (at least) */
} ME_Run;

typedef struct tagME_Border
{
  int width;
  COLORREF colorRef;
} ME_Border;

typedef struct tagME_BorderRect
{
  ME_Border top;
  ME_Border left;
  ME_Border bottom;
  ME_Border right;
} ME_BorderRect;

typedef struct tagME_Paragraph
{
  PARAFORMAT2 *pFmt;
  ME_String *text;

  struct tagME_DisplayItem *pCell; /* v4.1 */
  ME_BorderRect border;

  int nCharOfs;
  int nFlags;
  POINT pt;
  int nHeight, nWidth;
  int nRows;
  struct tagME_DisplayItem *prev_para, *next_para;
} ME_Paragraph;

typedef struct tagME_Cell /* v4.1 */
{
  int nNestingLevel; /* 0 for normal cells, and greater for nested cells */
  int nRightBoundary;
  ME_BorderRect border;
  POINT pt;
  int nHeight, nWidth;
  int yTextOffset; /* The text offset is caused by the largest top border. */
  struct tagME_DisplayItem *prev_cell, *next_cell, *parent_cell;
} ME_Cell;

typedef struct tagME_Row
{
  int nHeight;
  int nBaseline;
  int nWidth;
  int nLMargin;
  int nRMargin;
  POINT pt;
} ME_Row;

/* the display item list layout is like this:
 * - the document consists of paragraphs
 * - each paragraph contains at least one run, the last run in the paragraph
 *   is an end-of-paragraph run
 * - each formatted paragraph contains at least one row, which corresponds
 *   to a screen line (that's why there are no rows in an unformatted
 *   paragraph
 * - the paragraphs contain "shortcut" pointers to the previous and the next
 *   paragraph, that makes iteration over paragraphs faster 
 * - the list starts with diTextStart and ends with diTextEnd
 */

typedef struct tagME_DisplayItem
{
  ME_DIType type;
  struct tagME_DisplayItem *prev, *next;
  union {
    ME_Run run;
    ME_Row row;
    ME_Cell cell;
    ME_Paragraph para;
  } member;
} ME_DisplayItem;

typedef struct tagME_TextBuffer
{
  ME_DisplayItem *pFirst, *pLast;
  ME_Style *pCharStyle;
  ME_Style *pDefaultStyle;
} ME_TextBuffer;

typedef struct tagME_Cursor
{
  ME_DisplayItem *pPara;
  ME_DisplayItem *pRun;
  int nOffset;
} ME_Cursor;

typedef enum {
  umAddToUndo,
  umAddToRedo,
  umIgnore,
  umAddBackToUndo
} ME_UndoMode;

enum undo_type
{
    undo_insert_run,
    undo_delete_run,
    undo_join_paras,
    undo_split_para,
    undo_set_para_fmt,
    undo_set_char_fmt,
    undo_end_transaction,          /* marks the end of a group of changes for undo */
    undo_potential_end_transaction /* allows grouping typed chars for undo */
};

struct insert_run_item
{
    int pos, len;
    WCHAR *str;
    ME_Style *style;
    DWORD flags;
};

struct delete_run_item
{
    int pos, len;
};

struct join_paras_item
{
    int pos;
};

struct split_para_item
{
    int pos;
    PARAFORMAT2 fmt;
    ME_BorderRect border;
    ME_String *eol_str;
    DWORD flags;
    ME_BorderRect cell_border;
    int cell_right_boundary;
};

struct set_para_fmt_item
{
    int pos;
    PARAFORMAT2 fmt;
    ME_BorderRect border;
};

struct set_char_fmt_item
{
    int pos, len;
    CHARFORMAT2W fmt;
};

struct undo_item
{
    struct list entry;
    enum undo_type type;
    union
    {
        struct insert_run_item insert_run;
        struct delete_run_item delete_run;
        struct join_paras_item join_paras;
        struct split_para_item split_para;
        struct set_para_fmt_item set_para_fmt;
        struct set_char_fmt_item set_char_fmt;
    } u;
};

typedef enum {
  stPosition = 0,
  stWord,
  stLine,
  stParagraph,
  stDocument
} ME_SelectionType;

typedef struct tagME_FontTableItem {
  BYTE bCharSet;
  WCHAR *szFaceName;
} ME_FontTableItem;


#define STREAMIN_BUFFER_SIZE 4096 /* M$ compatibility */

struct tagME_InStream {
  EDITSTREAM *editstream;
  DWORD dwSize;
  DWORD dwUsed;
  char buffer[STREAMIN_BUFFER_SIZE];
};
typedef struct tagME_InStream ME_InStream;


#define STREAMOUT_BUFFER_SIZE 4096
#define STREAMOUT_FONTTBL_SIZE 8192
#define STREAMOUT_COLORTBL_SIZE 1024

typedef struct tagME_OutStream {
  EDITSTREAM *stream;
  char buffer[STREAMOUT_BUFFER_SIZE];
  UINT pos, written;
  UINT nCodePage;
  UINT nFontTblLen;
  ME_FontTableItem fonttbl[STREAMOUT_FONTTBL_SIZE];
  UINT nColorTblLen;
  COLORREF colortbl[STREAMOUT_COLORTBL_SIZE];
  UINT nDefaultFont;
  UINT nDefaultCodePage;
  /* nNestingLevel = 0 means we aren't in a cell, 1 means we are in a cell,
   * an greater numbers mean we are in a cell nested within a cell. */
  UINT nNestingLevel;
} ME_OutStream;

typedef struct tagME_FontCacheItem
{
  LOGFONTW lfSpecs;
  HFONT hFont;
  int nRefs;
  int nAge;
} ME_FontCacheItem;

#define HFONT_CACHE_SIZE 10

typedef struct tagME_TextEditor
{
  HWND hWnd, hwndParent;
  ITextHost *texthost;
  BOOL bEmulateVersion10;
  ME_TextBuffer *pBuffer;
  ME_Cursor *pCursors;
  DWORD styleFlags;
  DWORD exStyleFlags;
  int nCursors;
  SIZE sizeWindow;
  int nTotalLength, nLastTotalLength;
  int nTotalWidth, nLastTotalWidth;
  int nAvailWidth; /* 0 = wrap to client area, else wrap width in twips */
  int nUDArrowX;
  COLORREF rgbBackColor;
  HBRUSH hbrBackground;
  BOOL bCaretAtEnd;
  int nEventMask;
  int nModifyStep;
  struct list undo_stack;
  struct list redo_stack;
  int nUndoStackSize;
  int nUndoLimit;
  ME_UndoMode nUndoMode;
  int nParagraphs;
  int nLastSelStart, nLastSelEnd;
  ME_DisplayItem *pLastSelStartPara, *pLastSelEndPara;
  ME_FontCacheItem pFontCache[HFONT_CACHE_SIZE];
  int nZoomNumerator, nZoomDenominator;
  RECT prevClientRect;
  RECT rcFormat;
  BOOL bDefaultFormatRect;
  BOOL bWordWrap;
  int nTextLimit;
  EDITWORDBREAKPROCW pfnWordBreak;
  LPRICHEDITOLECALLBACK lpOleCallback;
  /*TEXTMODE variable; contains only one of each of the following options:
   *TM_RICHTEXT or TM_PLAINTEXT
   *TM_SINGLELEVELUNDO or TM_MULTILEVELUNDO
   *TM_SINGLECODEPAGE or TM_MULTICODEPAGE*/
  int mode;
  BOOL bHideSelection;
  BOOL AutoURLDetect_bEnable;
  WCHAR cPasswordMask;
  BOOL bHaveFocus;
  BOOL bDialogMode; /* Indicates that we are inside a dialog window */
  /*for IME */
  int imeStartIndex;
  DWORD selofs; /* The size of the selection bar on the left side of control */
  ME_SelectionType nSelectionType;

  /* Track previous notified selection */
  CHARRANGE notified_cr;

  /* Cache previously set scrollbar info */
  SCROLLINFO vert_si, horz_si;

  BOOL bMouseCaptured;
} ME_TextEditor;

typedef struct tagME_Context
{
  HDC hDC;
  POINT pt;
  RECT rcView;
  SIZE dpi;
  int nAvailWidth;

  /* those are valid inside ME_WrapTextParagraph and related */
  ME_TextEditor *editor;
} ME_Context;

typedef struct tagME_WrapContext
{
  ME_Style *style;
  ME_Context *context;
  int nLeftMargin, nRightMargin, nFirstMargin;
  int nAvailWidth;
  int nRow;
  POINT pt;
  BOOL bOverflown, bWordWrap;
  ME_DisplayItem *pPara;
  ME_DisplayItem *pRowStart;

  ME_DisplayItem *pLastSplittableRun;
} ME_WrapContext;

#endif