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Diffstat (limited to 'scintilla/src/PositionCache.h')
| -rw-r--r-- | scintilla/src/PositionCache.h | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/scintilla/src/PositionCache.h b/scintilla/src/PositionCache.h new file mode 100644 index 0000000..12273f5 --- /dev/null +++ b/scintilla/src/PositionCache.h @@ -0,0 +1,168 @@ +// 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;
+ int *positions;
+ char bracePreviousStyles[2];
+
+ // Hotspot support
+ int hsStart;
+ int hsEnd;
+
+ // Wrapped line support
+ int widthLine;
+ int lines;
+ int 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);
+ void RestoreBracesHighlight(Range rangeLine, Position braces[]);
+ int FindBefore(int 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;
+ short *positions;
+public:
+ PositionCacheEntry();
+ ~PositionCacheEntry();
+ void Set(unsigned int styleNumber_, const char *s_, unsigned int len_, int *positions_, unsigned int clock);
+ void Clear();
+ bool Retrieve(unsigned int styleNumber_, const char *s_, unsigned int len_, int *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 {
+ // 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 };
+ LineLayout *ll;
+ int lineStart;
+ int lineEnd;
+ int posLineStart;
+ bool utf8;
+ int nextBreak;
+ int *selAndEdge;
+ unsigned int saeSize;
+ unsigned int saeLen;
+ unsigned int saeCurrentPos;
+ int saeNext;
+ int subBreak;
+ void Insert(int val);
+public:
+ BreakFinder(LineLayout *ll_, int lineStart_, int lineEnd_, int posLineStart_, bool utf8_, int xStart, bool breakForSelection);
+ ~BreakFinder();
+ int First() const;
+ int Next();
+};
+
+class PositionCache {
+ PositionCacheEntry *pces;
+ size_t size;
+ unsigned int clock;
+ bool allClear;
+public:
+ PositionCache();
+ ~PositionCache();
+ void Clear();
+ void SetSize(size_t size_);
+ int GetSize() const { return size; }
+ void MeasureWidths(Surface *surface, ViewStyle &vstyle, unsigned int styleNumber,
+ const char *s, unsigned int len, int *positions);
+};
+
+inline bool IsSpaceOrTab(int ch) {
+ return ch == ' ' || ch == '\t';
+}
+
+#ifdef SCI_NAMESPACE
+}
+#endif
+
+#endif
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