src/TortoiseMerge/Undo.h

   1 // TortoiseGitMerge - a Diff/Patch program
   2
   3 // Copyright (C) 2006-2007,2009-2012 - 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 typedef struct viewstate
  32 {
  33         std::map<int, CString> difflines;
  34         std::map<int, DWORD> linestates;
  35         std::map<int, DWORD> linelines;
  36         std::map<int, EOL> linesEOL;
  37         std::list<int> addedlines;
  38
  39         std::map<int, viewdata> removedlines;
  40         std::map<int, viewdata> replacedlines;
  41
  42         void    AddViewLineFromView(CBaseView *pView, int nViewLine, bool bAddEmptyLine);
  43         void    Clear();
  44         bool    IsEmpty() { return difflines.empty() && linestates.empty() && linelines.empty() && linesEOL.empty() && addedlines.empty() && removedlines.empty() && replacedlines.empty(); }
  45 } viewstate;
  46
  47 /**
  48  * \ingroup TortoiseMerge
  49  * this struct holds all the information of a single change in TortoiseMerge for all(3) views.
  50  */
  51 struct allviewstate
  52 {
  53         viewstate right;
  54         viewstate bottom;
  55         viewstate left;
  56
  57         void    Clear() { right.Clear(); bottom.Clear(); left.Clear(); }
  58         bool    IsEmpty() { return right.IsEmpty() && bottom.IsEmpty() && left.IsEmpty(); }
  59 };
  60
  61 /**
  62  * \ingroup TortoiseMerge
  63  * Holds all the information of previous changes made to a view content.
  64  * Of course, can undo those changes.
  65  */
  66 class CUndo
  67 {
  68 public:
  69         static CUndo& GetInstance();
  70
  71         bool Undo(CBaseView * pLeft, CBaseView * pRight, CBaseView * pBottom);
  72         void AddState(const allviewstate& allstate, POINT pt);
  73         bool CanUndo() {return !m_viewstates.empty();}
  74
  75         bool IsGrouping() { return m_groups.size() % 2 == 1; }
  76         void BeginGrouping() { if (m_groupCount==0) m_groups.push_back(m_caretpoints.size()); m_groupCount++; }
  77         void EndGrouping(){ m_groupCount--; if (m_groupCount==0) m_groups.push_back(m_caretpoints.size()); }
  78         void Clear();
  79         void MarkAsOriginalState() { m_originalstate = m_viewstates.size(); }
  80 protected:
  81         void Undo(const viewstate& state, CBaseView * pView, const POINT& pt);
  82         void UndoOne(CBaseView * pLeft, CBaseView * pRight, CBaseView * pBottom);
  83         std::list<allviewstate> m_viewstates;
  84         std::list<POINT> m_caretpoints;
  85         std::list< std::list<int>::size_type > m_groups;
  86         size_t m_originalstate;
  87         int m_groupCount;
  88 private:
  89         CUndo();
  90         ~CUndo();
  91 };