lyx_mirror/src/undo.C

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/**
* \file undo.C
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author Asger Alstrup
* \author Lars Gullik Bj<EFBFBD>nnes
* \author John Levon
* \author Andr<EFBFBD> P<EFBFBD>nitz
* \author J<EFBFBD>rgen Vigna
*
* Full author contact details are available in file CREDITS.
*/
#include <config.h>
#include "undo.h"
#include "buffer.h"
#include "cursor.h"
#include "debug.h"
#include "BufferView.h"
#include "lyxtext.h"
#include "paragraph.h"
#include "ParagraphList.h"
#include "mathed/MathSupport.h"
#include "insets/inset.h"
#include <algorithm>
namespace lyx {
using std::advance;
using std::endl;
namespace {
/// The flag used by finishUndo().
bool undo_finished;
std::ostream & operator<<(std::ostream & os, Undo const & undo)
{
return os << " from: " << undo.from << " end: " << undo.end
<< " cell:\n" << undo.cell
<< " cursor:\n" << undo.cursor;
}
bool samePar(StableDocIterator const & i1, StableDocIterator const & i2)
{
StableDocIterator tmpi2 = i2;
tmpi2.pos() = i1.pos();
return i1 == tmpi2;
}
void doRecordUndo(Undo::undo_kind kind,
DocIterator const & cell,
pit_type first_pit, pit_type last_pit,
DocIterator const & cur,
BufferParams const & bparams,
bool isFullBuffer,
limited_stack<Undo> & stack)
{
if (first_pit > last_pit)
std::swap(first_pit, last_pit);
// create the position information of the Undo entry
Undo undo;
undo.kind = kind;
undo.cell = cell;
undo.cursor = cur;
undo.bparams = bparams ;
undo.isFullBuffer = isFullBuffer;
//lyxerr << "recordUndo: cur: " << cur << endl;
//lyxerr << "recordUndo: pos: " << cur.pos() << endl;
//lyxerr << "recordUndo: cell: " << cell << endl;
undo.from = first_pit;
undo.end = cell.lastpit() - last_pit;
// Undo::ATOMIC are always recorded (no overlapping there).
// As nobody wants all removed character appear one by one when undoing,
// we want combine 'similar' non-ATOMIC undo recordings to one.
if (!undo_finished
&& kind != Undo::ATOMIC
&& !stack.empty()
&& samePar(stack.top().cell, undo.cell)
&& stack.top().kind == undo.kind
&& stack.top().from == undo.from
&& stack.top().end == undo.end)
return;
// fill in the real data to be saved
if (cell.inMathed()) {
// simply use the whole cell
undo.array = asString(cell.cell());
} else {
// some more effort needed here as 'the whole cell' of the
// main LyXText _is_ the whole document.
// record the relevant paragraphs
LyXText const * text = cell.text();
BOOST_ASSERT(text);
ParagraphList const & plist = text->paragraphs();
ParagraphList::const_iterator first = plist.begin();
advance(first, first_pit);
ParagraphList::const_iterator last = plist.begin();
advance(last, last_pit + 1);
undo.pars = ParagraphList(first, last);
}
// push the undo entry to undo stack
//lyxerr << "undo record: " << stack.top() << std::endl;
stack.push(undo);
// next time we'll try again to combine entries if possible
undo_finished = false;
}
void recordUndo(Undo::undo_kind kind,
LCursor & cur, pit_type first_pit, pit_type last_pit,
limited_stack<Undo> & stack)
{
BOOST_ASSERT(first_pit <= cur.lastpit());
BOOST_ASSERT(last_pit <= cur.lastpit());
doRecordUndo(kind, cur, first_pit, last_pit, cur,
cur.bv().buffer()->params(), false, stack);
}
// Returns false if no undo possible.
bool textUndoOrRedo(BufferView & bv,
limited_stack<Undo> & stack, limited_stack<Undo> & otherstack)
{
finishUndo();
if (stack.empty()) {
// Nothing to do.
return false;
}
// Adjust undo stack and get hold of current undo data.
Undo undo = stack.top();
stack.pop();
// We will store in otherstack the part of the document under 'undo'
Buffer * buf = bv.buffer();
DocIterator cell_dit = undo.cell.asDocIterator(&buf->inset());
doRecordUndo(Undo::ATOMIC, cell_dit,
undo.from, cell_dit.lastpit() - undo.end, bv.cursor(),
undo.bparams, undo.isFullBuffer,
otherstack);
// This does the actual undo/redo.
//lyxerr << "undo, performing: " << undo << std::endl;
DocIterator dit = undo.cell.asDocIterator(&buf->inset());
if (undo.isFullBuffer) {
// This is a full document
otherstack.top().bparams = buf->params();
buf->params() = undo.bparams;
buf->paragraphs() = undo.pars;
} else if (dit.inMathed()) {
// We stored the full cell here as there is not much to be
// gained by storing just 'a few' paragraphs (most if not
// all math inset cells have just one paragraph!)
//lyxerr << "undo.array=" << undo.array <<endl;
asArray(undo.array, dit.cell());
} else {
// Some finer machinery is needed here.
LyXText * text = dit.text();
BOOST_ASSERT(text);
ParagraphList & plist = text->paragraphs();
// remove new stuff between first and last
ParagraphList::iterator first = plist.begin();
advance(first, undo.from);
ParagraphList::iterator last = plist.begin();
advance(last, plist.size() - undo.end);
plist.erase(first, last);
// re-insert old stuff instead
first = plist.begin();
advance(first, undo.from);
// this ugly stuff is needed until we get rid of the
// inset_owner backpointer
ParagraphList::iterator pit = undo.pars.begin();
ParagraphList::iterator const end = undo.pars.end();
for (; pit != end; ++pit)
pit->setInsetOwner(dit.realInset());
plist.insert(first, undo.pars.begin(), undo.pars.end());
}
// Set cursor
LCursor & cur = bv.cursor();
cur.setCursor(undo.cursor.asDocIterator(&buf->inset()));
cur.selection() = false;
cur.resetAnchor();
finishUndo();
return true;
}
} // namespace anon
void finishUndo()
{
// Make sure the next operation will be stored.
undo_finished = true;
}
bool textUndo(BufferView & bv)
{
return textUndoOrRedo(bv, bv.buffer()->undostack(),
bv.buffer()->redostack());
}
bool textRedo(BufferView & bv)
{
return textUndoOrRedo(bv, bv.buffer()->redostack(),
bv.buffer()->undostack());
}
void recordUndo(Undo::undo_kind kind,
LCursor & cur, pit_type first, pit_type last)
{
Buffer * buf = cur.bv().buffer();
recordUndo(kind, cur, first, last, buf->undostack());
buf->redostack().clear();
//lyxerr << "undostack:\n";
//for (size_t i = 0, n = buf->undostack().size(); i != n && i < 6; ++i)
// lyxerr << " " << i << ": " << buf->undostack()[i] << std::endl;
}
void recordUndo(LCursor & cur, Undo::undo_kind kind)
{
recordUndo(kind, cur, cur.pit(), cur.pit());
}
void recordUndoInset(LCursor & cur, Undo::undo_kind kind)
{
LCursor c = cur;
c.pop();
Buffer * buf = cur.bv().buffer();
doRecordUndo(kind, c, c.pit(), c.pit(), cur,
buf->params(), false, buf->undostack());
}
void recordUndoSelection(LCursor & cur, Undo::undo_kind kind)
{
recordUndo(kind, cur, cur.selBegin().pit(), cur.selEnd().pit());
}
void recordUndo(LCursor & cur, Undo::undo_kind kind, pit_type from)
{
recordUndo(kind, cur, cur.pit(), from);
}
void recordUndo(LCursor & cur, Undo::undo_kind kind,
pit_type from, pit_type to)
{
recordUndo(kind, cur, from, to);
}
void recordUndoFullDocument(BufferView * bv)
{
Buffer * buf = bv->buffer();
doRecordUndo(
Undo::ATOMIC,
doc_iterator_begin(buf->inset()),
0, buf->paragraphs().size() - 1,
bv->cursor(),
buf->params(),
true,
buf->undostack()
);
undo_finished = false;
}
} // namespace lyx