src/lanes.h

   1 /*
   2         Author: Marco Costalba (C) 2005-2007
   3
   4         Copyright: See COPYING file that comes with this distribution
   5
   6 */
   7 #ifndef LANES_H
   8 #define LANES_H
   9
  10 #include <QString>
  11 #include <QVector>
  12
  13 class QStringList;
  14
  15
  16 //
  17 //  At any given time, the Lanes class represents a single revision (row) of the history graph.
  18 //  The Lanes class contains a vector of the sha1 hashes of the next commit to appear in each lane (column).
  19 //  The Lanes class also contains a vector used to decide which glyph to draw on the history graph.
  20 //
  21 //  For each revision (row) (from recent (top) to ancient past (bottom)), the Lanes class is updated, and the
  22 //  current revision (row) of glyphs is saved elsewhere (via getLanes()).
  23 //
  24 //  The ListView class is responsible for rendering the glyphs.
  25 //
  26
  27
  28 class Lanes {
  29 public:
  30         Lanes() {} // init() will setup us later, when data is available
  31         bool isEmpty() { return typeVec.empty(); }
  32         void init(const QString& expectedSha);
  33         void clear();
  34         bool isFork(const QString& sha, bool& isDiscontinuity);
  35         void setBoundary(bool isBoundary);
  36         void setFork(const QString& sha);
  37         void setMerge(const QStringList& parents);
  38         void setInitial();
  39         void setApplied();
  40         void changeActiveLane(const QString& sha);
  41         void afterMerge();
  42         void afterFork();
  43         bool isBranch();
  44         void afterBranch();
  45         void afterApplied();
  46         void nextParent(const QString& sha);
  47         void getLanes(QVector<int> &ln) { ln = typeVec; } // O(1) vector is implicitly shared
  48
  49 private:
  50         int findNextSha(const QString& next, int pos);
  51         int findType(int type, int pos);
  52         int add(int type, const QString& next, int pos);
  53
  54         int activeLane;
  55         QVector<int> typeVec;  // Describes which glyphs should be drawn.
  56         QVector<QString> nextShaVec;  // The sha1 hashes of the next commit to appear in each lane (column).
  57         bool boundary;
  58         int NODE, NODE_L, NODE_R;
  59 };
  60
  61 #endif