src/undo.C

   1 /**
   2  * \file undo.C
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Asger Alstrup
   7  * \author Lars Gullik Bjønnes
   8  * \author John Levon
   9  * \author André Pönitz
  10  * \author Jürgen Vigna
  11  *
  12  * Full author contact details are available in file CREDITS.
  13  */
  14
  15 #include <config.h>
  16
  17 #include "undo.h"
  18
  19 #include "buffer.h"
  20 #include "cursor.h"
  21 #include "debug.h"
  22 #include "BufferView.h"
  23 #include "lyxtext.h"
  24 #include "paragraph.h"
  25 #include "ParagraphList.h"
  26
  27 #include "mathed/math_support.h"
  28 #include "insets/inset.h"
  29
  30 #include <algorithm>
  31
  32 using lyx::pit_type;
  33
  34 using std::advance;
  35 using std::endl;
  36
  37
  38 namespace {
  39
  40 /// The flag used by finishUndo().
  41 bool undo_finished;
  42
  43
  44 std::ostream & operator<<(std::ostream & os, Undo const & undo)
  45 {
  46         return os << " from: " << undo.from << " end: " << undo.end
  47                 << " cell:\n" << undo.cell
  48                 << " cursor:\n" << undo.cursor;
  49 }
  50
  51
  52 bool samePar(StableDocIterator const & i1, StableDocIterator const & i2)
  53 {
  54         StableDocIterator tmpi2 = i2;
  55         tmpi2.pos() = i1.pos();
  56         return i1 == tmpi2;
  57 }
  58
  59
  60 void doRecordUndo(Undo::undo_kind kind,
  61         DocIterator const & cell,
  62         pit_type first_pit, pit_type last_pit,
  63         DocIterator const & cur,
  64         BufferParams const & bparams,
  65         bool isFullBuffer,
  66         limited_stack<Undo> & stack)
  67 {
  68         if (first_pit > last_pit)
  69                 std::swap(first_pit, last_pit);
  70         // create the position information of the Undo entry
  71         Undo undo;
  72         undo.kind = kind;
  73         undo.cell = cell;
  74         undo.cursor = cur;
  75         undo.bparams = bparams ;
  76         undo.isFullBuffer = isFullBuffer;
  77         //lyxerr << "recordUndo: cur: " << cur << endl;
  78         //lyxerr << "recordUndo: pos: " << cur.pos() << endl;
  79         //lyxerr << "recordUndo: cell: " << cell << endl;
  80         undo.from = first_pit;
  81         undo.end = cell.lastpit() - last_pit;
  82
  83         // Undo::ATOMIC are always recorded (no overlapping there).
  84         // As nobody wants all removed character appear one by one when undoing,
  85         // we want combine 'similar' non-ATOMIC undo recordings to one.
  86         if (!undo_finished
  87             && kind != Undo::ATOMIC
  88             && !stack.empty()
  89             && samePar(stack.top().cell, undo.cell)
  90             && stack.top().kind == undo.kind
  91             && stack.top().from == undo.from
  92             && stack.top().end == undo.end)
  93                 return;
  94
  95         // fill in the real data to be saved
  96         if (cell.inMathed()) {
  97                 // simply use the whole cell
  98                 undo.array = asString(cell.cell());
  99         } else {
 100                 // some more effort needed here as 'the whole cell' of the
 101                 // main LyXText _is_ the whole document.
 102                 // record the relevant paragraphs
 103                 LyXText const * text = cell.text();
 104                 BOOST_ASSERT(text);
 105                 ParagraphList const & plist = text->paragraphs();
 106                 ParagraphList::const_iterator first = plist.begin();
 107                 advance(first, first_pit);
 108                 ParagraphList::const_iterator last = plist.begin();
 109                 advance(last, last_pit + 1);
 110                 undo.pars = ParagraphList(first, last);
 111         }
 112
 113         // push the undo entry to undo stack
 114         //lyxerr << "undo record: " << stack.top() << std::endl;
 115         stack.push(undo);
 116
 117         // next time we'll try again to combine entries if possible
 118         undo_finished = false;
 119 }
 120
 121
 122 void recordUndo(Undo::undo_kind kind,
 123         LCursor & cur, pit_type first_pit, pit_type last_pit,
 124         limited_stack<Undo> & stack)
 125 {
 126         BOOST_ASSERT(first_pit <= cur.lastpit());
 127         BOOST_ASSERT(last_pit <= cur.lastpit());
 128
 129         doRecordUndo(kind, cur, first_pit, last_pit, cur,
 130                 cur.bv().buffer()->params(), false, stack);
 131 }
 132
 133
 134
 135 // Returns false if no undo possible.
 136 bool textUndoOrRedo(BufferView & bv,
 137         limited_stack<Undo> & stack, limited_stack<Undo> & otherstack)
 138 {
 139         finishUndo();
 140
 141         if (stack.empty()) {
 142                 // Nothing to do.
 143                 return false;
 144         }
 145
 146         // Adjust undo stack and get hold of current undo data.
 147         Undo undo = stack.top();
 148         stack.pop();
 149
 150         // We will store in otherstack the part of the document under 'undo'
 151         Buffer * buf = bv.buffer();
 152         DocIterator cell_dit = undo.cell.asDocIterator(&buf->inset());
 153
 154         doRecordUndo(Undo::ATOMIC, cell_dit,
 155                    undo.from, cell_dit.lastpit() - undo.end, bv.cursor(),
 156                          undo.bparams, undo.isFullBuffer,
 157                    otherstack);
 158
 159         // This does the actual undo/redo.
 160         //lyxerr << "undo, performing: " << undo << std::endl;
 161         DocIterator dit = undo.cell.asDocIterator(&buf->inset());
 162         if (undo.isFullBuffer) {
 163                 // This is a full document
 164                 otherstack.top().bparams = buf->params();
 165                 buf->params() = undo.bparams;
 166                 buf->paragraphs() = undo.pars;
 167         } else if (dit.inMathed()) {
 168                 // We stored the full cell here as there is not much to be
 169                 // gained by storing just 'a few' paragraphs (most if not
 170                 // all math inset cells have just one paragraph!)
 171                 asArray(undo.array, dit.cell());
 172         } else {
 173                 // Some finer machinery is needed here.
 174                 LyXText * text = dit.text();
 175                 BOOST_ASSERT(text);
 176                 ParagraphList & plist = text->paragraphs();
 177
 178                 // remove new stuff between first and last
 179                 ParagraphList::iterator first = plist.begin();
 180                 advance(first, undo.from);
 181                 ParagraphList::iterator last = plist.begin();
 182                 advance(last, plist.size() - undo.end);
 183                 plist.erase(first, last);
 184
 185                 // re-insert old stuff instead
 186                 first = plist.begin();
 187                 advance(first, undo.from);
 188
 189                 // this ugly stuff is needed until we get rid of the
 190                 // inset_owner backpointer
 191                 ParagraphList::iterator pit = undo.pars.begin();
 192                 ParagraphList::iterator const end = undo.pars.end();
 193                 for (; pit != end; ++pit)
 194                         pit->setInsetOwner(dit.realInset());
 195                 plist.insert(first, undo.pars.begin(), undo.pars.end());
 196         }
 197
 198         // Set cursor
 199         LCursor & cur = bv.cursor();
 200         cur.setCursor(undo.cursor.asDocIterator(&buf->inset()));
 201         cur.selection() = false;
 202         cur.resetAnchor();
 203         finishUndo();
 204
 205         return true;
 206 }
 207
 208 } // namespace anon
 209
 210
 211 void finishUndo()
 212 {
 213         // Make sure the next operation will be stored.
 214         undo_finished = true;
 215 }
 216
 217
 218 bool textUndo(BufferView & bv)
 219 {
 220         return textUndoOrRedo(bv, bv.buffer()->undostack(),
 221                               bv.buffer()->redostack());
 222 }
 223
 224
 225 bool textRedo(BufferView & bv)
 226 {
 227         return textUndoOrRedo(bv, bv.buffer()->redostack(),
 228                               bv.buffer()->undostack());
 229 }
 230
 231
 232 void recordUndo(Undo::undo_kind kind,
 233         LCursor & cur, pit_type first, pit_type last)
 234 {
 235         Buffer * buf = cur.bv().buffer();
 236         recordUndo(kind, cur, first, last, buf->undostack());
 237         buf->redostack().clear();
 238         //lyxerr << "undostack:\n";
 239         //for (size_t i = 0, n = buf->undostack().size(); i != n && i < 6; ++i)
 240         //      lyxerr << "  " << i << ": " << buf->undostack()[i] << std::endl;
 241 }
 242
 243
 244 void recordUndo(LCursor & cur, Undo::undo_kind kind)
 245 {
 246         recordUndo(kind, cur, cur.pit(), cur.pit());
 247 }
 248
 249
 250 void recordUndoInset(LCursor & cur, Undo::undo_kind kind)
 251 {
 252         LCursor c = cur;
 253         c.pop();
 254         recordUndo(c, kind);
 255 }
 256
 257
 258 void recordUndoSelection(LCursor & cur, Undo::undo_kind kind)
 259 {
 260         recordUndo(kind, cur, cur.selBegin().pit(), cur.selEnd().pit());
 261 }
 262
 263
 264 void recordUndo(LCursor & cur, Undo::undo_kind kind, pit_type from)
 265 {
 266         recordUndo(kind, cur, cur.pit(), from);
 267 }
 268
 269
 270 void recordUndo(LCursor & cur, Undo::undo_kind kind,
 271         pit_type from, pit_type to)
 272 {
 273         recordUndo(kind, cur, from, to);
 274 }
 275
 276
 277 void recordUndoFullDocument(BufferView * bv)
 278 {
 279         Buffer * buf = bv->buffer();
 280         doRecordUndo(
 281                 Undo::ATOMIC,
 282                 doc_iterator_begin(buf->inset()),
 283                 0, buf->paragraphs().size() - 1,
 284                 bv->cursor(),
 285                 buf->params(),
 286                 true,
 287                 buf->undostack()
 288         );
 289         undo_finished = false;
 290 }