X-Git-Url: https://git.lyx.org/gitweb/?a=blobdiff_plain;f=src%2Fcursor.C;h=a87d20a3a6de671163d860e9a3bc68a37fbf2ee3;hb=41ecabf5197a74719dd125e974b062184208c96b;hp=32257acfc0ba5512ecbe01fd48af89be0f394257;hpb=cc719fe0ce934bdd505a52542c0e5246889e7d3f;p=lyx.git

diff --git a/src/cursor.C b/src/cursor.C
index 32257acfc0..e72426f647 100644
--- a/src/cursor.C
+++ b/src/cursor.C
@@ -3,80 +3,1188 @@
  * This file is part of LyX, the document processor.
  * Licence details can be found in the file COPYING.
  *
- * \author Jürgen Vigna
+ * \author Alejandro Aguilar Sierra
+ * \author Alfredo Braunstein
+ * \author André Pönitz
  *
  * Full author contact details are available in file CREDITS.
  */
 
 #include <config.h>
 
-#include "buffer.h"
 #include "BufferView.h"
+#include "buffer.h"
 #include "cursor.h"
+#include "coordcache.h"
+#include "CutAndPaste.h"
 #include "debug.h"
 #include "dispatchresult.h"
-#include "iterators.h"
+#include "encoding.h"
+#include "funcrequest.h"
+#include "language.h"
+#include "lfuns.h"
+#include "lyxfont.h"
+#include "lyxfunc.h" // only for setMessage()
+#include "lyxrc.h"
+#include "lyxrow.h"
 #include "lyxtext.h"
 #include "paragraph.h"
+#include "paragraph_funcs.h"
+#include "pariterator.h"
 
 #include "insets/updatableinset.h"
+#include "insets/insettabular.h"
+#include "insets/insettext.h"
+
+#include "mathed/math_data.h"
+#include "mathed/math_inset.h"
+#include "mathed/math_macrotable.h"
+
+#include "support/limited_stack.h"
+
+#include "frontends/LyXView.h"
+#include "frontends/font_metrics.h"
+
+#include <boost/assert.hpp>
+#include <boost/bind.hpp>
+#include <boost/current_function.hpp>
+
+#include <sstream>
+#include <limits>
 
+using lyx::pit_type;
+
+using std::string;
 using std::vector;
 using std::endl;
+#ifndef CXX_GLOBAL_CSTD
+using std::isalpha;
+#endif
+using std::min;
+using std::swap;
 
+namespace {
+
+	bool
+	positionable(DocIterator const & cursor, DocIterator const & anchor)
+	{
+		// avoid deeper nested insets when selecting
+		if (cursor.depth() > anchor.depth())
+			return false;
+
+		// anchor might be deeper, should have same path then
+		for (size_t i = 0; i < cursor.depth(); ++i)
+			if (&cursor[i].inset() != &anchor[i].inset())
+				return false;
+
+		// position should be ok.
+		return true;
+	}
 
-DispatchResult Cursor::dispatch(FuncRequest const & cmd)
-{
-	for (int i = data_.size() - 1; i >= 0; --i) {
-		lyxerr << "trying to dispatch to inset" << data_[i].inset_ << endl;
-		DispatchResult res = data_[i].inset_->dispatch(cmd);
-		lyxerr << "   result: " << res.val() << endl;
 
-		if (res.dispatched()) {
-			if (res.val() != NOUPDATE) {
-				//update();
+	// Find position closest to (x, y) in cell given by iter.
+	// Used only in mathed
+	DocIterator bruteFind2(LCursor const & c, int x, int y)
+	{
+		double best_dist = std::numeric_limits<double>::max();
+
+		DocIterator result;
+
+		DocIterator it = c;
+		it.top().pos() = 0;
+		DocIterator et = c;
+		et.top().pos() = et.top().asMathInset()->cell(et.top().idx()).size();
+		for (int i = 0; ; ++i) {
+			int xo;
+			int yo;
+			it.inset().cursorPos(it.top(), c.boundary(), xo, yo);
+			double d = (x - xo) * (x - xo) + (y - yo) * (y - yo);
+			// '<=' in order to take the last possible position
+			// this is important for clicking behind \sum in e.g. '\sum_i a'
+			lyxerr[Debug::DEBUG] << "i: " << i << " d: " << d
+				<< " best: " << best_dist << endl;
+			if (d <= best_dist) {
+				best_dist = d;
+				result = it;
 			}
-			return DispatchResult(true);
+			if (it == et)
+				break;
+			it.forwardPos();
 		}
+		return result;
+	}
+
+
+	/// moves position closest to (x, y) in given box
+	bool bruteFind(LCursor & cursor,
+		int x, int y, int xlow, int xhigh, int ylow, int yhigh)
+	{
+		BOOST_ASSERT(!cursor.empty());
+		CursorSlice bottom = cursor[0];
+
+		DocIterator it = doc_iterator_begin(bottom.inset());
+		DocIterator const et = doc_iterator_end(bottom.inset());
+
+		double best_dist = std::numeric_limits<double>::max();;
+		DocIterator best_cursor = et;
 
-		lyxerr << "# unhandled result: " << res.val() << endl;
+		for ( ; it != et; it.forwardPos()) {
+			// avoid invalid nesting when selecting
+			if (bv_funcs::status(&cursor.bv(), it) == bv_funcs::CUR_INSIDE
+			    && (!cursor.selection() || positionable(it, cursor.anchor_))) {
+				Point p = bv_funcs::getPos(it, false);
+				int xo = p.x_;
+				int yo = p.y_;
+				if (xlow <= xo && xo <= xhigh && ylow <= yo && yo <= yhigh) {
+					double d = (x - xo) * (x - xo) + (y - yo) * (y - yo);
+					//lyxerr << "xo: " << xo << " yo: " << yo << " d: " << d << endl;
+					// '<=' in order to take the last possible position
+					// this is important for clicking behind \sum in e.g. '\sum_i a'
+					if (d <= best_dist) {
+						//lyxerr << "*" << endl;
+						best_dist   = d;
+						best_cursor = it;
+					}
+				}
+			}
+		}
+
+		//lyxerr << "best_dist: " << best_dist << " cur:\n" << best_cursor << endl;
+		if (best_cursor != et) {
+			cursor.setCursor(best_cursor);
+			return true;
+		}
+
+		return false;
 	}
-	return DispatchResult(false);
+
+} // namespace anon
+
+
+// be careful: this is called from the bv's constructor, too, so
+// bv functions are not yet available!
+LCursor::LCursor(BufferView & bv)
+	: DocIterator(), bv_(&bv), anchor_(), x_target_(-1),
+	  selection_(false), mark_(false), logicalpos_(false)
+{}
+
+
+void LCursor::reset(InsetBase & inset)
+{
+	clear();
+	push_back(CursorSlice(inset));
+	anchor_ = DocIterator(inset);
+	clearTargetX();
+	selection_ = false;
+	mark_ = false;
 }
 
 
-void buildCursor(Cursor & cursor, BufferView & bv)
+// this (intentionally) does neither touch anchor nor selection status
+void LCursor::setCursor(DocIterator const & cur)
 {
-	UpdatableInset * inset = bv.theLockingInset();
-	lyxerr << "\nbuildCursor: " << inset << endl;
-	if (!inset)
+	DocIterator::operator=(cur);
+}
+
+
+void LCursor::dispatch(FuncRequest const & cmd0)
+{
+	lyxerr[Debug::DEBUG] << BOOST_CURRENT_FUNCTION
+			     << " cmd: " << cmd0 << '\n'
+			     << *this << endl;
+	if (empty())
 		return;
 
-	inset = inset->getLockingInset();
+	fixIfBroken();
+	FuncRequest cmd = cmd0;
+	LCursor safe = *this;
+
+	for (; depth(); pop()) {
+		lyxerr[Debug::DEBUG] << "LCursor::dispatch: cmd: "
+			<< cmd0 << endl << *this << endl;
+		BOOST_ASSERT(pos() <= lastpos());
+		BOOST_ASSERT(idx() <= lastidx());
+		BOOST_ASSERT(pit() <= lastpit());
+
+		// The common case is 'LFUN handled, need update', so make the
+		// LFUN handler's life easier by assuming this as default value.
+		// The handler can reset the update and val flags if necessary.
+		disp_.update(true);
+		disp_.dispatched(true);
+		inset().dispatch(*this, cmd);
+		if (disp_.dispatched())
+			break;
+	}
+	// it completely to get a 'bomb early' behaviour in case this
+	// object will be used again.
+	if (!disp_.dispatched()) {
+		lyxerr[Debug::DEBUG] << "RESTORING OLD CURSOR!" << endl;
+		operator=(safe);
+		disp_.dispatched(false);
+	}
+}
+
+
+DispatchResult LCursor::result() const
+{
+	return disp_;
+}
+
+
+BufferView & LCursor::bv() const
+{
+	BOOST_ASSERT(bv_);
+	return *bv_;
+}
+
+
+Buffer & LCursor::buffer() const
+{
+	BOOST_ASSERT(bv_);
+	BOOST_ASSERT(bv_->buffer());
+	return *bv_->buffer();
+}
+
+
+void LCursor::pop()
+{
+	BOOST_ASSERT(depth() >= 1);
+	pop_back();
+}
+
+
+void LCursor::push(InsetBase & p)
+{
+	push_back(CursorSlice(p));
+}
+
+
+void LCursor::pushLeft(InsetBase & p)
+{
+	BOOST_ASSERT(!empty());
+	//lyxerr << "Entering inset " << t << " left" << endl;
+	push(p);
+	p.idxFirst(*this);
+}
+
+
+bool LCursor::popLeft()
+{
+	BOOST_ASSERT(!empty());
+	//lyxerr << "Leaving inset to the left" << endl;
+	inset().notifyCursorLeaves(*this);
+	if (depth() == 1)
+		return false;
+	pop();
+	return true;
+}
+
+
+bool LCursor::popRight()
+{
+	BOOST_ASSERT(!empty());
+	//lyxerr << "Leaving inset to the right" << endl;
+	inset().notifyCursorLeaves(*this);
+	if (depth() == 1)
+		return false;
+	pop();
+	++pos();
+	return true;
+}
+
+
+int LCursor::currentMode()
+{
+	BOOST_ASSERT(!empty());
+	for (int i = depth() - 1; i >= 0; --i) {
+		int res = operator[](i).inset().currentMode();
+		if (res != InsetBase::UNDECIDED_MODE)
+			return res;
+	}
+	return InsetBase::TEXT_MODE;
+}
+
+
+void LCursor::getPos(int & x, int & y) const
+{
+	Point p = bv_funcs::getPos(*this, boundary());
+	x = p.x_;
+	y = p.y_;
+}
+
+
+void LCursor::paste(string const & data)
+{
+	dispatch(FuncRequest(LFUN_PASTE, data));
+}
+
+
+void LCursor::resetAnchor()
+{
+	anchor_ = *this;
+}
+
+
+
+bool LCursor::posLeft()
+{
+	if (pos() == 0)
+		return false;
+	--pos();
+	return true;
+}
+
+
+bool LCursor::posRight()
+{
+	if (pos() == lastpos())
+		return false;
+	++pos();
+	return true;
+}
+
+
+CursorSlice LCursor::anchor() const
+{
+	BOOST_ASSERT(anchor_.depth() >= depth());
+	CursorSlice normal = anchor_[depth() - 1];
+	if (depth() < anchor_.depth() && top() <= normal) {
+		// anchor is behind cursor -> move anchor behind the inset
+		++normal.pos();
+	}
+	return normal;
+}
+
+
+CursorSlice LCursor::selBegin() const
+{
+	if (!selection())
+		return top();
+	return anchor() < top() ? anchor() : top();
+}
+
+
+CursorSlice LCursor::selEnd() const
+{
+	if (!selection())
+		return top();
+	return anchor() > top() ? anchor() : top();
+}
+
+
+DocIterator LCursor::selectionBegin() const
+{
+	if (!selection())
+		return *this;
+	return anchor() < top() ? anchor_ : *this;
+}
+
+
+DocIterator LCursor::selectionEnd() const
+{
+	if (!selection())
+		return *this;
+	return anchor() > top() ? anchor_ : *this;
+}
+
+
+void LCursor::setSelection()
+{
+	selection() = true;
+	// A selection with no contents is not a selection
+#ifdef WITH_WARNINGS
+#warning doesnt look ok
+#endif
+	if (pit() == anchor().pit() && pos() == anchor().pos())
+		selection() = false;
+}
+
+
+void LCursor::setSelection(DocIterator const & where, size_t n)
+{
+	setCursor(where);
+	selection() = true;
+	anchor_ = where;
+	pos() += n;
+	// Open all collapsed insets
+	for (int i = depth() - 1; i >= 0; --i)
+		operator[](i).inset().setStatus(*this, InsetBase::Open);
+}
+
 
-	bool ok = false;
-	ParIterator pit = bv.buffer()->par_iterator_begin();
-	ParIterator end = bv.buffer()->par_iterator_end();
-	for ( ; pit != end && !ok; ++pit) {
-		InsetList::iterator	it = pit->insetlist.begin();
-		InsetList::iterator	iend = pit->insetlist.end();
-		for ( ; it != iend && !ok; ++it)
-			if (it->inset == inset || it->inset == inset->owner())
-				ok = true;
+void LCursor::clearSelection()
+{
+	selection() = false;
+	mark() = false;
+	resetAnchor();
+	bv().unsetXSel();
+}
+
+
+int & LCursor::x_target()
+{
+	return x_target_;
+}
+
+
+int LCursor::x_target() const
+{
+	return x_target_;
+}
+
+
+void LCursor::clearTargetX()
+{
+	x_target_ = -1;
+}
+
+
+
+void LCursor::info(std::ostream & os) const
+{
+	for (int i = 1, n = depth(); i < n; ++i) {
+		operator[](i).inset().infoize(os);
+		os << "  ";
 	}
+	if (pos() != 0)
+		prevInset()->infoize2(os);
+	// overwite old message
+	os << "                    ";
+}
 
-	if (!ok) {
-		lyxerr << " tli not found! inset: " << inset << endl;
+
+void LCursor::selHandle(bool sel)
+{
+	//lyxerr << "LCursor::selHandle" << endl;
+	if (sel == selection())
 		return;
+
+	resetAnchor();
+	selection() = sel;
+}
+
+
+std::ostream & operator<<(std::ostream & os, LCursor const & cur)
+{
+	os << "\n cursor:                                | anchor:\n";
+	for (size_t i = 0, n = cur.depth(); i != n; ++i) {
+		os << " " << cur[i] << " | ";
+		if (i < cur.anchor_.depth())
+			os << cur.anchor_[i];
+		else
+			os << "-------------------------------";
+		os << "\n";
+	}
+	for (size_t i = cur.depth(), n = cur.anchor_.depth(); i < n; ++i) {
+		os << "------------------------------- | " << cur.anchor_[i] << "\n";
+	}
+	os << " selection: " << cur.selection_
+	   << " x_target: " << cur.x_target_ << endl;
+	return os;
+}
+
+
+
+
+///////////////////////////////////////////////////////////////////
+//
+// The part below is the non-integrated rest of the original math
+// cursor. This should be either generalized for texted or moved
+// back to mathed (in most cases to MathNestInset).
+//
+///////////////////////////////////////////////////////////////////
+
+#include "mathed/math_charinset.h"
+#include "mathed/math_factory.h"
+#include "mathed/math_gridinset.h"
+#include "mathed/math_macroarg.h"
+#include "mathed/math_mathmlstream.h"
+#include "mathed/math_scriptinset.h"
+#include "mathed/math_support.h"
+#include "mathed/math_unknowninset.h"
+
+//#define FILEDEBUG 1
+
+
+bool LCursor::isInside(InsetBase const * p)
+{
+	for (size_t i = 0; i != depth(); ++i)
+		if (&operator[](i).inset() == p)
+			return true;
+	return false;
+}
+
+
+void LCursor::leaveInset(InsetBase const & inset)
+{
+	for (size_t i = 0; i != depth(); ++i) {
+		if (&operator[](i).inset() == &inset) {
+			resize(i);
+			return;
+		}
 	}
+}
+
 
-	pit.asCursor(cursor);
-	for (size_t i = 0, n = cursor.data_.size(); i != n; ++i) {
-		lyxerr << " inset: " << cursor.data_[i].inset_
-		       << " idx: " << cursor.data_[i].idx_
-		       << " text: " << cursor.data_[i].text_
-		       << " par: " << cursor.data_[i].par_
-		       << " pos: " << cursor.data_[i].pos_
-		       << endl;
+bool LCursor::openable(MathAtom const & t) const
+{
+	if (!t->isActive())
+		return false;
+
+	if (t->lock())
+		return false;
+
+	if (!selection())
+		return true;
+
+	// we can't move into anything new during selection
+	if (depth() >= anchor_.depth())
+		return false;
+	if (!ptr_cmp(t.nucleus(), &anchor_[depth()].inset()))
+		return false;
+
+	return true;
+}
+
+
+void LCursor::setScreenPos(int x, int y)
+{
+	x_target() = x;
+	bruteFind(*this, x, y, 0, bv().workWidth(), 0, bv().workHeight());
+}
+
+
+
+void LCursor::plainErase()
+{
+	cell().erase(pos());
+}
+
+
+void LCursor::markInsert()
+{
+	insert(char(0));
+}
+
+
+void LCursor::markErase()
+{
+	cell().erase(pos());
+}
+
+
+void LCursor::plainInsert(MathAtom const & t)
+{
+	cell().insert(pos(), t);
+	++pos();
+}
+
+
+void LCursor::insert(string const & str)
+{
+	for_each(str.begin(), str.end(),
+		 boost::bind(static_cast<void(LCursor::*)(char)>
+			     (&LCursor::insert), this, _1));
+}
+
+
+void LCursor::insert(char c)
+{
+	//lyxerr << "LCursor::insert char '" << c << "'" << endl;
+	BOOST_ASSERT(!empty());
+	if (inMathed()) {
+		lyx::cap::selClearOrDel(*this);
+		insert(new MathCharInset(c));
+	} else {
+		text()->insertChar(*this, c);
+	}
+}
+
+
+void LCursor::insert(MathAtom const & t)
+{
+	//lyxerr << "LCursor::insert MathAtom '" << t << "'" << endl;
+	macroModeClose();
+	lyx::cap::selClearOrDel(*this);
+	plainInsert(t);
+}
+
+
+void LCursor::insert(InsetBase * inset)
+{
+	if (inMathed())
+		insert(MathAtom(inset));
+	else
+		text()->insertInset(*this, inset);
+}
+
+
+void LCursor::niceInsert(string const & t)
+{
+	MathArray ar;
+	asArray(t, ar);
+	if (ar.size() == 1)
+		niceInsert(ar[0]);
+	else
+		insert(ar);
+}
+
+
+void LCursor::niceInsert(MathAtom const & t)
+{
+	macroModeClose();
+	string const safe = lyx::cap::grabAndEraseSelection(*this);
+	plainInsert(t);
+	// enter the new inset and move the contents of the selection if possible
+	if (t->isActive()) {
+		posLeft();
+		// be careful here: don't use 'pushLeft(t)' as this we need to
+		// push the clone, not the original
+		pushLeft(*nextInset());
+		paste(safe);
+	}
+}
+
+
+void LCursor::insert(MathArray const & ar)
+{
+	macroModeClose();
+	if (selection())
+		lyx::cap::eraseSelection(*this);
+	cell().insert(pos(), ar);
+	pos() += ar.size();
+}
+
+
+bool LCursor::backspace()
+{
+	autocorrect() = false;
+
+	if (selection()) {
+		lyx::cap::selDel(*this);
+		return true;
+	}
+
+	if (pos() == 0) {
+		if (inset().nargs() == 1 && depth() == 1 && lastpos() == 0)
+			return false;
+		pullArg();
+		return true;
+	}
+
+	if (inMacroMode()) {
+		MathUnknownInset * p = activeMacro();
+		if (p->name().size() > 1) {
+			p->setName(p->name().substr(0, p->name().size() - 1));
+			return true;
+		}
+	}
+
+	if (pos() != 0 && prevAtom()->nargs() > 0) {
+		// let's require two backspaces for 'big stuff' and
+		// highlight on the first
+		resetAnchor();
+		selection() = true;
+		--pos();
+	} else {
+		--pos();
+		plainErase();
+	}
+	return true;
+}
+
+
+bool LCursor::erase()
+{
+	autocorrect() = false;
+	if (inMacroMode())
+		return true;
+
+	if (selection()) {
+		lyx::cap::selDel(*this);
+		return true;
+	}
+
+	// delete empty cells if possible
+	if (pos() == lastpos() && inset().idxDelete(idx()))
+		return true;
+
+	// special behaviour when in last position of cell
+	if (pos() == lastpos()) {
+		bool one_cell = inset().nargs() == 1;
+		if (one_cell && depth() == 1 && lastpos() == 0)
+			return false;
+		// remove markup
+		if (one_cell)
+			pullArg();
+		else
+			inset().idxGlue(idx());
+		return true;
+	}
+
+	// 'clever' UI hack: only erase large items if previously slected
+	if (pos() != lastpos() && inset().nargs() > 0) {
+		resetAnchor();
+		selection() = true;
+		++pos();
+	} else {
+		plainErase();
+	}
+
+	return true;
+}
+
+
+bool LCursor::up()
+{
+	macroModeClose();
+	DocIterator save = *this;
+	if (goUpDown(true))
+		return true;
+	setCursor(save);
+	autocorrect() = false;
+	return selection();
+}
+
+
+bool LCursor::down()
+{
+	macroModeClose();
+	DocIterator save = *this;
+	if (goUpDown(false))
+		return true;
+	setCursor(save);
+	autocorrect() = false;
+	return selection();
+}
+
+
+void LCursor::macroModeClose()
+{
+	if (!inMacroMode())
+		return;
+	MathUnknownInset * p = activeMacro();
+	p->finalize();
+	string const s = p->name();
+	--pos();
+	cell().erase(pos());
+
+	// do nothing if the macro name is empty
+	if (s == "\\")
+		return;
+
+	string const name = s.substr(1);
+
+	// prevent entering of recursive macros
+	// FIXME: this is only a weak attempt... only prevents immediate
+	// recursion
+	InsetBase const * macro = innerInsetOfType(InsetBase::MATHMACRO_CODE);
+	if (macro && macro->getInsetName() == name)
+		lyxerr << "can't enter recursive macro" << endl;
+
+	plainInsert(createMathInset(name));
+}
+
+
+string LCursor::macroName()
+{
+	return inMacroMode() ? activeMacro()->name() : string();
+}
+
+
+void LCursor::handleNest(MathAtom const & a, int c)
+{
+	//lyxerr << "LCursor::handleNest: " << c << endl;
+	MathAtom t = a;
+	asArray(lyx::cap::grabAndEraseSelection(*this), t.nucleus()->cell(c));
+	insert(t);
+	posLeft();
+	pushLeft(*nextInset());
+}
+
+
+int LCursor::targetX() const
+{
+	if (x_target() != -1)
+		return x_target();
+	int x = 0;
+	int y = 0;
+	getPos(x, y);
+	return x;
+}
+
+
+void LCursor::setTargetX()
+{
+	// For now this is good enough. A better solution would be to
+	// avoid this rebreak by setting cursorX only after drawing
+	bottom().text()->redoParagraph(bottom().pit());
+	int x;
+	int y;
+	getPos(x, y);
+	x_target_ = x;
+}
+
+
+bool LCursor::inMacroMode() const
+{
+	if (pos() == 0)
+		return false;
+	MathUnknownInset const * p = prevAtom()->asUnknownInset();
+	return p && !p->final();
+}
+
+
+MathUnknownInset * LCursor::activeMacro()
+{
+	return inMacroMode() ? prevAtom().nucleus()->asUnknownInset() : 0;
+}
+
+
+void LCursor::pullArg()
+{
+#ifdef WITH_WARNINGS
+#warning Look here
+#endif
+	MathArray ar = cell();
+	if (popLeft() && inMathed()) {
+		plainErase();
+		cell().insert(pos(), ar);
+		resetAnchor();
+	} else {
+		//formula()->mutateToText();
+	}
+}
+
+
+void LCursor::touch()
+{
+#ifdef WITH_WARNINGS
+#warning look here
+#endif
+#if 0
+	DocIterator::const_iterator it = begin();
+	DocIterator::const_iterator et = end();
+	for ( ; it != et; ++it)
+		it->cell().touch();
+#endif
+}
+
+
+void LCursor::normalize()
+{
+	if (idx() >= nargs()) {
+		lyxerr << "this should not really happen - 1: "
+		       << idx() << ' ' << nargs()
+		       << " in: " << &inset() << endl;
+	}
+	idx() = min(idx(), lastidx());
+
+	if (pos() > lastpos()) {
+		lyxerr << "this should not really happen - 2: "
+			<< pos() << ' ' << lastpos() <<  " in idx: " << idx()
+		       << " in atom: '";
+		WriteStream wi(lyxerr, false, true);
+		inset().asMathInset()->write(wi);
+		lyxerr << endl;
+	}
+	pos() = min(pos(), lastpos());
+}
+
+
+bool LCursor::goUpDown(bool up)
+{
+	// Be warned: The 'logic' implemented in this function is highly
+	// fragile. A distance of one pixel or a '<' vs '<=' _really
+	// matters. So fiddle around with it only if you think you know
+	// what you are doing!
+
+	int xo = 0;
+	int yo = 0;
+	getPos(xo, yo);
+
+	// check if we had something else in mind, if not, this is the future goal
+	if (x_target() == -1)
+		x_target() = xo;
+	else
+		xo = x_target();
+
+	// try neigbouring script insets
+	if (!selection()) {
+		// try left
+		if (pos() != 0) {
+			MathScriptInset const * p = prevAtom()->asScriptInset();
+			if (p && p->has(up)) {
+				--pos();
+				push(inset());
+				idx() = up; // the superscript has index 1
+				pos() = lastpos();
+				//lyxerr << "updown: handled by scriptinset to the left" << endl;
+				return true;
+			}
+		}
+
+		// try right
+		if (pos() != lastpos()) {
+			MathScriptInset const * p = nextAtom()->asScriptInset();
+			if (p && p->has(up)) {
+				push(inset());
+				idx() = up;
+				pos() = 0;
+				//lyxerr << "updown: handled by scriptinset to the right" << endl;
+				return true;
+			}
+		}
+	}
+
+	//xarray().boundingBox(xlow, xhigh, ylow, yhigh);
+	//if (up)
+	//	yhigh = yo - 4;
+	//else
+	//	ylow = yo + 4;
+	//if (bruteFind(*this, xo, yo, xlow, xhigh, ylow, yhigh)) {
+	//	lyxerr << "updown: handled by brute find in the same cell" << endl;
+	//	return true;
+	//}
+
+	// try to find an inset that knows better then we
+	while (true) {
+		//lyxerr << "updown: We are in " << &inset() << " idx: " << idx() << endl;
+		// ask inset first
+		if (inset().idxUpDown(*this, up)) {
+			// try to find best position within this inset
+			if (!selection())
+				setCursor(bruteFind2(*this, xo, yo));
+			return true;
+		}
+
+		// no such inset found, just take something "above"
+		//lyxerr << "updown: handled by strange case" << endl;
+		if (!popLeft()) {
+			int ylow  = up ? 0 : yo + 1;
+			int yhigh = up ? yo - 1 : bv().workHeight();
+			return bruteFind(*this, xo, yo, 0, bv().workWidth(), ylow, yhigh);
+		}
+
+		// any improvement so far?
+		int xnew;
+		int ynew;
+		getPos(xnew, ynew);
+		if (up ? ynew < yo : ynew > yo)
+			return true;
+	}
+
+	// we should not come here.
+	BOOST_ASSERT(false);
+}
+
+
+void LCursor::handleFont(string const & font)
+{
+	lyxerr[Debug::DEBUG] << BOOST_CURRENT_FUNCTION << ": " << font << endl;
+	string safe;
+	if (selection()) {
+		macroModeClose();
+		safe = lyx::cap::grabAndEraseSelection(*this);
+	}
+
+	if (lastpos() != 0) {
+		// something left in the cell
+		if (pos() == 0) {
+			// cursor in first position
+			popLeft();
+		} else if (pos() == lastpos()) {
+			// cursor in last position
+			popRight();
+		} else {
+			// cursor in between. split cell
+			MathArray::iterator bt = cell().begin();
+			MathAtom at = createMathInset(font);
+			at.nucleus()->cell(0) = MathArray(bt, bt + pos());
+			cell().erase(bt, bt + pos());
+			popLeft();
+			plainInsert(at);
+		}
+	} else {
+		// nothing left in the cell
+		pullArg();
+		plainErase();
+	}
+	insert(safe);
+}
+
+
+void LCursor::message(string const & msg) const
+{
+	bv().owner()->getLyXFunc().setMessage(msg);
+}
+
+
+void LCursor::errorMessage(string const & msg) const
+{
+	bv().owner()->getLyXFunc().setErrorMessage(msg);
+}
+
+
+string LCursor::selectionAsString(bool label) const
+{
+	if (!selection())
+		return string();
+
+	if (inTexted()) {
+		Buffer const & buffer = *bv().buffer();
+		ParagraphList & pars = text()->paragraphs();
+
+		// should be const ...
+		pit_type startpit = selBegin().pit();
+		pit_type endpit = selEnd().pit();
+		size_t const startpos = selBegin().pos();
+		size_t const endpos = selEnd().pos();
+
+		if (startpit == endpit)
+			return pars[startpit].asString(buffer, startpos, endpos, label);
+
+		// First paragraph in selection
+		string result = pars[startpit].
+			asString(buffer, startpos, pars[startpit].size(), label) + "\n\n";
+
+		// The paragraphs in between (if any)
+		for (pit_type pit = startpit + 1; pit != endpit; ++pit) {
+			Paragraph & par = pars[pit];
+			result += par.asString(buffer, 0, par.size(), label) + "\n\n";
+		}
+
+		// Last paragraph in selection
+		result += pars[endpit].asString(buffer, 0, endpos, label);
+
+		return result;
+	}
+
+#ifdef WITH_WARNINGS
+#warning and mathed?
+#endif
+	return string();
+}
+
+
+string LCursor::currentState()
+{
+	if (inMathed()) {
+		std::ostringstream os;
+		info(os);
+		return os.str();
+	}
+
+	if (inTexted())
+		return text()->currentState(*this);
+
+	return string();
+}
+
+
+string LCursor::getPossibleLabel()
+{
+	return inMathed() ? "eq:" : text()->getPossibleLabel(*this);
+}
+
+
+Encoding const * LCursor::getEncoding() const
+{
+	if (empty())
+		return 0;
+	if (!bv().buffer())
+		return 0;
+	int s = 0;
+	// go up until first non-0 text is hit
+	// (innermost text is 0 in mathed)
+	for (s = depth() - 1; s >= 0; --s)
+		if (operator[](s).text())
+			break;
+	CursorSlice const & sl = operator[](s);
+	LyXText const & text = *sl.text();
+	LyXFont font = text.getPar(sl.pit()).getFont(
+		bv().buffer()->params(), sl.pos(), outerFont(sl.pit(), text.paragraphs()));
+	return font.language()->encoding();
+}
+
+
+void LCursor::undispatched()
+{
+	disp_.dispatched(false);
+}
+
+
+void LCursor::dispatched()
+{
+	disp_.dispatched(true);
+}
+
+
+void LCursor::needsUpdate()
+{
+	disp_.update(true);
+}
+
+
+void LCursor::noUpdate()
+{
+	disp_.update(false);
+}
+
+
+LyXFont LCursor::getFont() const
+{
+	// HACK. far from being perfect...
+	int s = 0;
+	// go up until first non-0 text is hit
+	// (innermost text is 0 in mathed)
+	for (s = depth() - 1; s >= 0; --s)
+		if (operator[](s).text())
+			break;
+	CursorSlice const & sl = operator[](s);
+	LyXText const & text = *sl.text();
+	LyXFont font = text.getPar(sl.pit()).getFont(
+		bv().buffer()->params(),
+		sl.pos(),
+		outerFont(sl.pit(), text.paragraphs()));
+
+	return font;
+}
+
+
+void LCursor::fixIfBroken()
+{
+	// find out last good level
+	LCursor copy = *this;
+	size_t newdepth = depth();
+	while (!copy.empty()) {
+		if (copy.idx() > copy.lastidx()) {
+			lyxerr << "wrong idx " << copy.idx()
+			       << ", max is " << copy.lastidx()
+			       << " at level " << copy.depth()
+			       << ". Trying to correct this."  << endl;
+			newdepth = copy.depth() - 1;
+		}
+		else if (copy.pit() > copy.lastpit()) {
+			lyxerr << "wrong pit " << copy.pit()
+			       << ", max is " << copy.lastpit()
+			       << " at level " << copy.depth()
+			       << ". Trying to correct this."  << endl;
+			newdepth = copy.depth() - 1;
+		}
+		else if (copy.pos() > copy.lastpos()) {
+			lyxerr << "wrong pos " << copy.pos()
+			       << ", max is " << copy.lastpos()
+			       << " at level " << copy.depth()
+			       << ". Trying to correct this."  << endl;
+			newdepth = copy.depth() - 1;
+		}
+		copy.pop();
+	}
+	// shrink cursor to a size where everything is valid, possibly
+	// leaving insets
+	while (depth() > newdepth) {
+		pop();
+		lyxerr << "correcting cursor to level " << depth() << endl;
 	}
 }