lyx_mirror/src/CoordCache.h

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// -*- C++ -*-
/* \file CoordCache.h
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author Andr<EFBFBD> P<EFBFBD>nitz
*
* Full author contact details are available in file CREDITS.
*/
#ifndef COORDCACHE_H
#define COORDCACHE_H
// It seems that MacOSX define the check macro.
#undef check
#include "support/types.h"
#include <map>
namespace lyx {
class Inset;
class Text;
class MathData;
class Paragraph;
void lyxbreaker(void const * data, const char * hint, int size);
class Point {
public:
Point()
: x_(0), y_(0)
{}
Point(int x, int y);
int x_, y_;
};
template <class T> class CoordCacheBase {
public:
void clear()
{
data_.clear();
}
bool const empty() const
{
return data_.empty();
}
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_;
public:
cache_type const & getData() const { return 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
* updates. (x,y) == (0,0) is the upper left screen corner, x increases
* to the right, y increases downwords.
* The cache is built in BufferView::updateMetrics which is called
* from BufferView::update. The individual points are added
* while we paint them. See for instance paintPar in RowPainter.C.
*/
class CoordCache {
public:
void clear();
Point get(Text const *, pit_type) const;
/// A map from paragraph index number to screen point
typedef std::map<pit_type, Point> InnerParPosCache;
/// A map from a Text to the map of paragraphs to screen points
typedef std::map<Text const *, InnerParPosCache> ParPosCache;
/// A map from a CursorSlice to screen points
typedef std::map<Text const *, InnerParPosCache> SliceCache;
/// A map from MathData to position on the screen
CoordCacheBase<MathData> & arrays() { return arrays_; }
CoordCacheBase<MathData> const & getArrays() const { return arrays_; }
/// A map from insets to positions on the screen
CoordCacheBase<Inset> & insets() { return insets_; }
CoordCacheBase<Inset> const & getInsets() const { return insets_; }
/// A map from (Text, paragraph) pair to screen positions
ParPosCache & parPos() { return pars_; }
ParPosCache const & getParPos() const { return pars_; }
///
SliceCache & slice(bool boundary)
{
return boundary ? slices1_ : slices0_;
}
SliceCache const & getSlice(bool boundary) const
{
return boundary ? slices1_ : slices0_;
}
/// Dump the contents of the cache to lyxerr in debugging form
void dump() const;
private:
/// MathDatas
CoordCacheBase<MathData> arrays_;
// All insets
CoordCacheBase<Inset> insets_;
/// Paragraph grouped by owning text
ParPosCache pars_;
/// Used with boundary == 0
SliceCache slices0_;
/// Used with boundary == 1
SliceCache slices1_;
};
} // namespace lyx
#endif