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TQCommand.h
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1 // @(#)root/base:$Id$
2 // Author: Valeriy Onuchin 04/27/2004
3 
4 /*************************************************************************
5  * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
6  * All rights reserved. *
7  * *
8  * For the licensing terms see $ROOTSYS/LICENSE. *
9  * For the list of contributors see $ROOTSYS/README/CREDITS. *
10  *************************************************************************/
11 
12 #ifndef ROOT_TQCommand
13 #define ROOT_TQCommand
14 
15 //////////////////////////////////////////////////////////////////////////
16 // //
17 // TQCommand, TQUndoManager - support for multiple Undo/Redo operations //
18 // //
19 //////////////////////////////////////////////////////////////////////////
20 
21 #include "TList.h"
22 
23 #include "TQObject.h"
24 
25 class TQConnection;
26 
27 class TQCommand : public TList, public TQObject {
28 
29 friend class TQUndoManager;
30 
31 protected:
32  TQConnection *fRedo; // do/redo action
33  TQConnection *fUndo; // undo action
34  Long_t *fRedoArgs; // redo values
35  Long_t *fUndoArgs; // undo values
36  Int_t fNRargs; // number of redo arguments
37  Int_t fNUargs; // number of undo arguments
38  Int_t fState; // -1 undoing on, 1 redoing on, 0 nothing in progress
39  Int_t fStatus; // fStatus++ after Redo(), fStatus-- after Undo()
40  Bool_t fNewDelete; // kTRUE if Redo/Undo methods are new/delete
41  TString fName; // command name. Default is "ClassName::RedoName(args)"
42  TString fTitle; // command description
43  void *fObject; // object to which undo/redo actions applied
44 
45  virtual void Init(const char *cl, void *object,
46  const char *redo, const char *undo);
47  virtual void PrintCollectionHeader(Option_t* option) const;
48 
49 private:
50  TQCommand &operator=(const TQCommand &); // Not yet implemented.
51 
52 public:
53  TQCommand(const char *cl = 0, void *object = 0,
54  const char *redo = 0, const char *undo = 0);
55  TQCommand(TObject *obj, const char *redo = 0, const char *undo = 0);
56  TQCommand(const TQCommand &com);
57  virtual ~TQCommand();
58 
59  virtual void Redo(Option_t *option=""); //*SIGNAL*
60  virtual void Undo(Option_t *option=""); //*SIGNAL*
61  virtual void SetArgs(Int_t nargs, ...);
62  virtual void SetUndoArgs(Int_t nargs, ...);
63  virtual void SetRedoArgs(Int_t nargs, ...);
64  virtual Bool_t CanMerge(TQCommand *c) const;
65  virtual void Merge(TQCommand *c);
66  virtual Long64_t Merge(TCollection*,TFileMergeInfo*);
67  virtual Bool_t CanCompress(TQCommand *c) const;
68  virtual void Compress(TQCommand *c);
69  virtual Bool_t IsEqual(const TObject* obj) const;
70  virtual Bool_t IsSetter() const;
71  virtual Bool_t CanRedo() const;
72  virtual Bool_t CanUndo() const;
73  const char *GetRedoName() const;
74  const char *GetUndoName() const;
75  TQConnection *GetRedo() const { return fRedo; }
76  TQConnection *GetUndo() const { return fUndo; }
77  Long_t *GetRedoArgs() const;
78  Long_t *GetUndoArgs() const;
79  Int_t GetNRargs() const;
80  Int_t GetNUargs() const;
81  void *GetObject() const;
82  Int_t GetStatus() const;
83  Bool_t IsMacro() const;
84  Bool_t IsUndoing() const;
85  Bool_t IsRedoing() const;
86  Bool_t IsExecuting() const;
87  virtual void SetName(const char *name);
88  virtual void SetTitle(const char *title);
89  virtual void ls(Option_t *option="") const;
90  virtual void Add(TObject *obj, Option_t *opt);
91  virtual void Add(TObject *obj) { Add(obj, 0); }
92  virtual void Delete(Option_t *option="");
93  virtual const char *GetName() const;
94  virtual const char *GetTitle() const;
95 
96  static TQCommand *GetCommand();
97 
98  ClassDef(TQCommand,0) // encapsulates the information for undo/redo a single action.
99 };
100 
101 
102 //////////////////////////////////////////////////////////////////////////
103 class TQUndoManager : public TQCommand {
104 
105 protected:
106  TObjLink *fCursor; // current position in history stack
107  TQCommand *fCurrent; // the latest executed command
108  UInt_t fLimit; // maximum number of commands can be located in stack
109  TList *fLogBook; // listing of all actions during execution
110  Bool_t fLogging; // kTRUE if logging is ON
111 
112  virtual void PrintCollectionEntry(TObject* entry, Option_t* option, Int_t recurse) const;
113 
114 public:
115  TQUndoManager();
116  virtual ~TQUndoManager();
117 
118  virtual void Add(TObject *obj, Option_t *opt);
119  virtual void Add(TObject *obj) { Add(obj, 0); }
120  virtual void Redo(Option_t *option="");
121  virtual void Undo(Option_t *option="");
122  virtual Bool_t CanRedo() const;
123  virtual Bool_t CanUndo() const;
124  virtual void SetLogging(Bool_t on = kTRUE);
125  Bool_t IsLogging() const;
126  TQCommand *GetCurrent() const;
127  TQCommand *GetCursor() const;
128  UInt_t GetLimit() const;
129  virtual void SetLimit(UInt_t limit);
130  virtual void CurrentChanged(TQCommand *c); //*SIGNAL*
131  virtual void ls(Option_t *option="") const;
132 
133  ClassDef(TQUndoManager,0) // recorder of operations for undo and redo
134 };
135 
136 #endif