src/undo.h

   1 // -*- C++ -*-
   2 /* This file is part of
   3  * ======================================================
   4  *
   5  *           LyX, The Document Processor
   6  *
   7  *           Copyright 1995 Matthias Ettrich
   8  *           Copyright 1995-2001 The LyX Team.
   9  *
  10  * ====================================================== */
  11
  12 #ifndef UNDO_H
  13 #define UNDO_H
  14
  15 #include "ParagraphList.h"
  16
  17 /**
  18  * These are the elements put on the undo stack. Each object
  19  * contains complete paragraphs and sufficient information
  20  * to restore the state. The work is done in undo_funcs.C
  21  */
  22 class Undo {
  23 public:
  24         /**
  25          * The undo kinds are used to combine consecutive undo recordings
  26          * of the same kind.
  27          */
  28         enum undo_kind {
  29                 /**
  30                  * Insert something - these will combine to one big chunk
  31                  * when many inserts come after each other.
  32                  */
  33                 INSERT,
  34
  35                 /**
  36                  * Delete something - these will combine to one big chunk
  37                  * when many deletes come after each other.
  38                  */
  39                 DELETE,
  40
  41                 /// Atomic - each of these will have its own entry in the stack
  42                 ATOMIC
  43         };
  44         ///
  45         Undo(undo_kind kind, int inset_id,
  46              int first, int last,
  47              int cursor, int cursor_pos,
  48              ParagraphList const & par_arg);
  49
  50         /// Which kind of operation are we recording for?
  51         undo_kind kind;
  52
  53         /**
  54          * ID of hosting inset if the cursor is in one.
  55          * if -1, then the cursor is not in an inset.
  56          * if >= 0, then the cursor is in inset with given id.
  57          */
  58         int inset_id;
  59
  60         /// Offset to the first paragraph in the main document paragraph list
  61         int first_par_offset;
  62
  63         /// Offset to the last paragraph from the end of the main par. list
  64         int last_par_offset;
  65
  66         /**
  67          * Offset from the start of the main document paragraph list,
  68          * except if inside an inset, in which case it's the offset
  69          * inside the hosting inset.
  70          */
  71         int cursor_par_offset;
  72
  73         /// The position of the cursor in the hosting paragraph
  74         int cursor_pos;
  75
  76         /// The contents of the paragraphs saved
  77         ParagraphList pars;
  78 };
  79
  80
  81 #endif