src/TortoiseMerge/Undo.h

   1 // TortoiseGitMerge - a Diff/Patch program
   2
   3 // Copyright (C) 2006-2007,2009-2015 - TortoiseSVN
   4 // Copyright (C) 2011 Sven Strickroth <email@cs-ware.de>
   5
   6 // This program is free software; you can redistribute it and/or
   7 // modify it under the terms of the GNU General Public License
   8 // as published by the Free Software Foundation; either version 2
   9 // of the License, or (at your option) any later version.
  10
  11 // This program is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License
  17 // along with this program; if not, write to the Free Software Foundation,
  18 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 //
  20 #pragma once
  21 #include "ViewData.h"
  22 #include <map>
  23 #include <list>
  24
  25 class CBaseView;
  26
  27 /**
  28  * \ingroup TortoiseMerge
  29  * this struct holds all the information of a single change in TortoiseMerge.
  30  */
  31 class viewstate
  32 {
  33 public:
  34         viewstate()
  35         : modifies(false)
  36         {}
  37
  38         std::map<int, CString>  difflines;
  39         std::map<int, DWORD>    linestates;
  40         std::map<int, DWORD>    linelines;
  41         std::map<int, EOL>              linesEOL;
  42         std::map<int, bool>             markedlines;
  43         std::list<int>                  addedlines;
  44
  45         std::map<int, viewdata> removedlines;
  46         std::map<int, viewdata> replacedlines;
  47         bool                                    modifies; ///< this step modifies view (save before and after save differs)
  48
  49         void    AddViewLineFromView(CBaseView *pView, int nViewLine, bool bAddEmptyLine);
  50         void    Clear();
  51         bool    IsEmpty() const { return difflines.empty() && linestates.empty() && linelines.empty() && linesEOL.empty() && markedlines.empty() && addedlines.empty() && removedlines.empty() && replacedlines.empty(); }
  52 };
  53
  54 /**
  55  * \ingroup TortoiseMerge
  56  * this struct holds all the information of a single change in TortoiseMerge for all(3) views.
  57  */
  58 struct allviewstate
  59 {
  60         viewstate right;
  61         viewstate bottom;
  62         viewstate left;
  63
  64         void    Clear() { right.Clear(); bottom.Clear(); left.Clear(); }
  65         bool    IsEmpty() const { return right.IsEmpty() && bottom.IsEmpty() && left.IsEmpty(); }
  66 };
  67
  68 /**
  69  * \ingroup TortoiseMerge
  70  * Holds all the information of previous changes made to a view content.
  71  * Of course, can undo those changes.
  72  */
  73 class CUndo
  74 {
  75 public:
  76         static CUndo& GetInstance();
  77
  78         bool Undo(CBaseView * pLeft, CBaseView * pRight, CBaseView * pBottom);
  79         bool Redo(CBaseView * pLeft, CBaseView * pRight, CBaseView * pBottom);
  80         void AddState(const allviewstate& allstate, POINT pt);
  81         bool CanUndo() const {return !m_viewstates.empty();}
  82         bool CanRedo() const { return !m_redoviewstates.empty(); }
  83
  84         bool IsGrouping() const { return m_groups.size() % 2 == 1; }
  85         bool IsRedoGrouping() const { return m_redogroups.size() % 2 == 1; }
  86         void BeginGrouping() { if (m_groupCount==0) m_groups.push_back(m_caretpoints.size()); m_groupCount++; }
  87         void EndGrouping(){ m_groupCount--; if (m_groupCount==0) m_groups.push_back(m_caretpoints.size()); }
  88         void Clear();
  89         void MarkAllAsOriginalState() { MarkAsOriginalState(true, true, true); }
  90         void MarkAsOriginalState(bool Left, bool Right, bool Bottom);
  91 protected:
  92         viewstate Do(const viewstate& state, CBaseView * pView, const POINT& pt);
  93         void UndoOne(CBaseView * pLeft, CBaseView * pRight, CBaseView * pBottom);
  94         void RedoOne(CBaseView * pLeft, CBaseView * pRight, CBaseView * pBottom);
  95         std::list<allviewstate> m_viewstates;
  96         std::list<POINT> m_caretpoints;
  97         std::list< std::list<int>::size_type > m_groups;
  98         size_t m_originalstateLeft;
  99         size_t m_originalstateRight;
 100         size_t m_originalstateBottom;
 101         int m_groupCount;
 102
 103         std::list<allviewstate> m_redoviewstates;
 104         std::list<POINT> m_redocaretpoints;
 105         std::list< std::list<int>::size_type > m_redogroups;
 106
 107 private:
 108         CUndo();
 109         ~CUndo();
 110 };