src/TortoiseMerge/Undo.h

   1 // TortoiseMerge - a Diff/Patch program
   2
   3 // Copyright (C) 2006-2007 - 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
  41         void    AddLineFormView(CBaseView *pView, int nLine, bool bAddEmptyLine);
  42 } viewstate;
  43
  44 /**
  45  * \ingroup TortoiseMerge
  46  * Holds all the information of previous changes made to a view content.
  47  * Of course, can undo those changes.
  48  */
  49 class CUndo
  50 {
  51 public:
  52         static CUndo& GetInstance();
  53
  54         bool Undo(CBaseView * pLeft, CBaseView * pRight, CBaseView * pBottom);
  55         void AddState(const viewstate& leftstate, const viewstate& rightstate, const viewstate& bottomstate, POINT pt);
  56         bool CanUndo() { return (!m_viewstates.empty()); }
  57
  58         bool IsGrouping() { return m_groups.size() % 2 == 1; }
  59         void BeginGrouping() { ASSERT(!IsGrouping()); m_groups.push_back(m_caretpoints.size()); }
  60         void EndGrouping(){ ASSERT(IsGrouping()); m_groups.push_back(m_caretpoints.size()); }
  61         void Clear();
  62         void MarkAsOriginalState() { m_originalstate = (unsigned int)m_viewstates.size(); }
  63 protected:
  64         void Undo(const viewstate& state, CBaseView * pView);
  65         void UndoOne(CBaseView * pLeft, CBaseView * pRight, CBaseView * pBottom);
  66         std::list<viewstate> m_viewstates;
  67         std::list<POINT> m_caretpoints;
  68         std::list< std::list<int>::size_type > m_groups;
  69         unsigned int m_originalstate;
  70 private:
  71         CUndo();
  72         ~CUndo();
  73 };