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// Scintilla source code edit control
/** @file PositionCache.h
** Classes for caching layout information.
**/
// Copyright 1998-2009 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.
#ifndef POSITIONCACHE_H
#define POSITIONCACHE_H
#ifdef SCI_NAMESPACE
namespace Scintilla {
#endif
static inline bool IsEOLChar(char ch) {
return (ch == '\r') || (ch == '\n');
}
/**
*/
class LineLayout {
private:
friend class LineLayoutCache;
int *lineStarts;
int lenLineStarts;
/// Drawing is only performed for @a maxLineLength characters on each line.
int lineNumber;
bool inCache;
public:
enum { wrapWidthInfinite = 0x7ffffff };
int maxLineLength;
int numCharsInLine;
int numCharsBeforeEOL;
enum validLevel { llInvalid, llCheckTextAndStyle, llPositions, llLines } validity;
int xHighlightGuide;
bool highlightColumn;
Selection *psel;
bool containsCaret;
int edgeColumn;
char *chars;
unsigned char *styles;
int styleBitsSet;
char *indicators;
XYPOSITION *positions;
char bracePreviousStyles[2];
// Hotspot support
int hsStart;
int hsEnd;
// Wrapped line support
int widthLine;
int lines;
XYPOSITION wrapIndent; // In pixels
LineLayout(int maxLineLength_);
virtual ~LineLayout();
void Resize(int maxLineLength_);
void Free();
void Invalidate(validLevel validity_);
int LineStart(int line) const;
int LineLastVisible(int line) const;
bool InLine(int offset, int line) const;
void SetLineStart(int line, int start);
void SetBracesHighlight(Range rangeLine, Position braces[],
char bracesMatchStyle, int xHighlight, bool ignoreStyle);
void RestoreBracesHighlight(Range rangeLine, Position braces[], bool ignoreStyle);
int FindBefore(XYPOSITION x, int lower, int upper) const;
int EndLineStyle() const;
};
/**
*/
class LineLayoutCache {
int level;
int length;
int size;
LineLayout **cache;
bool allInvalidated;
int styleClock;
int useCount;
void Allocate(int length_);
void AllocateForLevel(int linesOnScreen, int linesInDoc);
public:
LineLayoutCache();
virtual ~LineLayoutCache();
void Deallocate();
enum {
llcNone=SC_CACHE_NONE,
llcCaret=SC_CACHE_CARET,
llcPage=SC_CACHE_PAGE,
llcDocument=SC_CACHE_DOCUMENT
};
void Invalidate(LineLayout::validLevel validity_);
void SetLevel(int level_);
int GetLevel() const { return level; }
LineLayout *Retrieve(int lineNumber, int lineCaret, int maxChars, int styleClock_,
int linesOnScreen, int linesInDoc);
void Dispose(LineLayout *ll);
};
class PositionCacheEntry {
unsigned int styleNumber:8;
unsigned int len:8;
unsigned int clock:16;
XYPOSITION *positions;
public:
PositionCacheEntry();
~PositionCacheEntry();
void Set(unsigned int styleNumber_, const char *s_, unsigned int len_, XYPOSITION *positions_, unsigned int clock);
void Clear();
bool Retrieve(unsigned int styleNumber_, const char *s_, unsigned int len_, XYPOSITION *positions_) const;
static int Hash(unsigned int styleNumber_, const char *s, unsigned int len);
bool NewerThan(const PositionCacheEntry &other) const;
void ResetClock();
};
// Class to break a line of text into shorter runs at sensible places.
class BreakFinder {
LineLayout *ll;
int lineStart;
int lineEnd;
int posLineStart;
int nextBreak;
int *selAndEdge;
unsigned int saeSize;
unsigned int saeLen;
unsigned int saeCurrentPos;
int saeNext;
int subBreak;
Document *pdoc;
void Insert(int val);
// Private so BreakFinder objects can not be copied
BreakFinder(const BreakFinder &);
public:
// If a whole run is longer than lengthStartSubdivision then subdivide
// into smaller runs at spaces or punctuation.
enum { lengthStartSubdivision = 300 };
// Try to make each subdivided run lengthEachSubdivision or shorter.
enum { lengthEachSubdivision = 100 };
BreakFinder(LineLayout *ll_, int lineStart_, int lineEnd_, int posLineStart_,
int xStart, bool breakForSelection, Document *pdoc_);
~BreakFinder();
int First() const;
int Next();
};
class PositionCache {
PositionCacheEntry *pces;
size_t size;
unsigned int clock;
bool allClear;
// Private so PositionCache objects can not be copied
PositionCache(const PositionCache &);
public:
PositionCache();
~PositionCache();
void Clear();
void SetSize(size_t size_);
size_t GetSize() const { return size; }
void MeasureWidths(Surface *surface, ViewStyle &vstyle, unsigned int styleNumber,
const char *s, unsigned int len, XYPOSITION *positions, Document *pdoc);
};
inline bool IsSpaceOrTab(int ch) {
return ch == ' ' || ch == '\t';
}
#ifdef SCI_NAMESPACE
}
#endif
#endif