BackupData.cc 4.03 KB
Newer Older
Dirk Wilden's avatar
Dirk Wilden committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
#include "BackupData.hh"

#define MAX_BACKUPS 20

//-----------------------------------------------------------------------------

BackupData::BackupData(BaseObjectData* _object) : currentState_(0), object_(_object)
{
}

//-----------------------------------------------------------------------------

BackupData::~BackupData(){
  clear();
}

//-----------------------------------------------------------------------------

void BackupData::storeBackup(BaseBackup* _backup){

  //store state
  if ( currentState_ != 0 )
    undoStates_.push_back( currentState_ );

  currentState_ = _backup;
  
  //clear redo states
  while( !redoStates_.empty() ){
    delete redoStates_.back();
    redoStates_.pop_back();
  }

  //delete undo backups if there are too many
  while( undoStates_.size() > MAX_BACKUPS ){
    delete undoStates_.front();
    undoStates_.erase( undoStates_.begin() );
  }
}

//-----------------------------------------------------------------------------

void BackupData::undo(){

  if ( undoStates_.empty() )
    return;

  //get backup
  BaseBackup* backup = undoStates_.back();
  
  //apply
  backup->apply();
  
  // update current state
  undoStates_.pop_back();
  redoStates_.push_back( currentState_ );
  currentState_ = backup;
}

//-----------------------------------------------------------------------------

void BackupData::redo(){

  if ( redoStates_.empty() )
    return;

  //get backup
  BaseBackup* backup = redoStates_.back();
  
  //apply
  backup->apply();
  
  // update current state
  redoStates_.pop_back();
  undoStates_.push_back( currentState_ );
  currentState_ = backup;
}

//-----------------------------------------------------------------------------

QString BackupData::undoName(){

  if ( undoStates_.empty() )
    return QString();

  return currentState_->name();
}

//-----------------------------------------------------------------------------

QString BackupData::redoName(){

  if ( redoStates_.empty() )
    return QString();

  return redoStates_.back()->name();
}

//-----------------------------------------------------------------------------

int BackupData::undoID(){

  if ( undoStates_.empty() )
    return -1;

  return undoStates_.back()->id();
}

//-----------------------------------------------------------------------------

int BackupData::redoID(){

  if ( redoStates_.empty() )
    return -1;

  return redoStates_.back()->id();
}

//-----------------------------------------------------------------------------

int BackupData::currentID(){

  if ( currentState_ == 0 )
    return -1;
  else
    return currentState_->id();
}

//-----------------------------------------------------------------------------

bool BackupData::undoAvailable(){
  return !undoStates_.empty();
}

//-----------------------------------------------------------------------------

bool BackupData::redoAvailable(){
  return !redoStates_.empty();
}

//-----------------------------------------------------------------------------

bool BackupData::undoBlocked(){

  if( !undoStates_.empty() )
    return currentState_->blocked();
  else
    return false;
}

//-----------------------------------------------------------------------------

bool BackupData::redoBlocked(){

  if( !redoStates_.empty() )
    return redoStates_.back()->blocked();
  else
    return false;
}
//-----------------------------------------------------------------------------

void BackupData::clear(){

  while( !undoStates_.empty() ){
    delete undoStates_.back();
    undoStates_.pop_back();
  }

  while( !redoStates_.empty() ){
    delete redoStates_.back();
    redoStates_.pop_back();
  }

  if ( currentState_ != 0 )
    delete currentState_;
  currentState_ = 0;
}

//-----------------------------------------------------------------------------

void BackupData::setLinks(IdList _objectIDs){

  if ( currentState_ != 0 )
    currentState_->setLinks(_objectIDs);
}

//-----------------------------------------------------------------------------

BaseBackup* BackupData::currentState(){
  return currentState_;
}

//-----------------------------------------------------------------------------