lyx_mirror/src/coordcache.h
André Pönitz f5e68ec257 fix bug 1795
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@10321 a592a061-630c-0410-9148-cb99ea01b6c8
2005-07-18 12:13:32 +00:00

169 lines
3.9 KiB
C++

// -*- C++ -*-
/* \file coordcache.h
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author André Pönitz
*
* Full author contact details are available in file CREDITS.
*/
#ifndef COORDCACHE_H
#define COORDCACHE_H
class InsetBase;
class LyXText;
class MathArray;
class Paragraph;
#include "support/types.h"
#include <boost/assert.hpp>
#include <map>
void lyxbreaker(void const * data, const char * hint, int size);
class Point {
public:
Point()
: x_(0), y_(0)
{}
Point(int x, int y)
: x_(x), y_(y)
{
BOOST_ASSERT(x > -1000000);
BOOST_ASSERT(x < 1000000);
BOOST_ASSERT(y > -1000000);
BOOST_ASSERT(y < 1000000);
}
int x_, y_;
};
template <class T> class CoordCacheBase {
public:
void clear()
{
data_.clear();
}
void add(T const * thing, int x, int y)
{
data_[thing] = Point(x, y);
}
int x(T const * thing) const
{
check(thing, "x");
return data_.find(thing)->second.x_;
}
int y(T const * thing) const
{
check(thing, "y");
return data_.find(thing)->second.y_;
}
Point xy(T const * thing) const
{
check(thing, "xy");
return data_.find(thing)->second;
}
bool has(T const * thing) const
{
return data_.find(thing) != data_.end();
}
// T * find(int x, int y) const
// {
// T *
// cache_type iter
// }
private:
friend class CoordCache;
void check(T const * thing, char const * hint) const
{
if (!has(thing))
lyxbreaker(thing, hint, data_.size());
}
typedef std::map<T const *, Point> cache_type;
cache_type data_;
};
/**
* A global cache that allows us to come from a paragraph in a document
* to a position point on the screen.
* All points cached in this cache are only valid between subsequent
* updated. (x,y) == (0,0) is the upper left screen corner, x increases
* to the right, y increases downwords.
* The cache is built in BufferView::Pimpl::metrics which is called
* from BufferView::Pimpl::update. The individual points are added
* while we paint them. See for instance paintPar in RowPainter.C.
*/
class CoordCache {
public:
CoordCache() : updating(false) { }
/// In order to find bugs, we record when we start updating the cache
void startUpdating();
/// When we are done, we record that to help find bugs
void doneUpdating();
void clear();
Point get(LyXText const *, lyx::pit_type);
/// A map from paragraph index number to screen point
typedef std::map<lyx::pit_type, Point> InnerParPosCache;
/// A map from a LyXText to the map of paragraphs to screen points
typedef std::map<LyXText const *, InnerParPosCache> ParPosCache;
/// A map from a CursorSlice to screen points
typedef std::map<LyXText const *, InnerParPosCache> SliceCache;
/// A map from MathArray to position on the screen
CoordCacheBase<MathArray> & arrays() { BOOST_ASSERT(updating); return arrays_; }
CoordCacheBase<MathArray> const & getArrays() const { return arrays_; }
/// A map from insets to positions on the screen
CoordCacheBase<InsetBase> & insets() { BOOST_ASSERT(updating); return insets_; }
CoordCacheBase<InsetBase> const & getInsets() const { return insets_; }
/// A map from (LyXText, paragraph) pair to screen positions
ParPosCache & parPos() { BOOST_ASSERT(updating); return pars_; }
ParPosCache const & getParPos() const { return pars_; }
///
SliceCache & slice(bool boundary)
{
BOOST_ASSERT(updating);
return boundary ? slices1_ : slices0_;
}
SliceCache const & getSlice(bool boundary) const
{
return boundary ? slices1_ : slices0_;
}
private:
/// MathArrays
CoordCacheBase<MathArray> arrays_;
// All insets
CoordCacheBase<InsetBase> insets_;
/// Paragraph grouped by owning text
ParPosCache pars_;
/// Used with boundary == 0
SliceCache slices0_;
/// Used with boundary == 1
SliceCache slices1_;
/**
* Debugging flag only: Set to true while the cache is being built.
* No changes to the structure are allowed unless we are updating.
*/
bool updating;
};
extern CoordCache theCoords;
#endif