1 | /*
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2 | * ActionHistory.cpp
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3 | *
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4 | * Created on: Mar 25, 2010
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5 | * Author: crueger
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6 | */
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7 |
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8 | #include "ActionHistory.hpp"
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9 |
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10 | #include <iostream>
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11 |
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12 | #include "Patterns/Singleton_impl.hpp"
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13 | #include "Helpers/Assert.hpp"
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14 | #include "Helpers/MemDebug.hpp"
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15 |
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16 | using namespace std;
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17 |
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18 | ActionHistory::ActionHistory()
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19 | {}
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20 |
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21 | ActionHistory::~ActionHistory()
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22 | {}
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23 |
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24 | void ActionHistory::undoLast(){
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25 | ASSERT(history.size(),"Undo performed when the undo-queue was empty");
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26 | HistoryElement elem = history.back();
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27 | history.pop_back();
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28 | Action::state_ptr newState = elem.action->undo(elem.state);
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29 | yrotsih.push_back(HistoryElement(elem.action,newState));
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30 | }
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31 | void ActionHistory::redoLast(){
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32 | ASSERT(yrotsih.size(),"Redo performed when the redo-queue was empty");
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33 | HistoryElement elem = yrotsih.back();
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34 | yrotsih.pop_back();
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35 | Action::state_ptr oldState = elem.action->redo(elem.state);
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36 | history.push_back(HistoryElement(elem.action,oldState));
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37 | }
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38 |
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39 | bool ActionHistory::hasUndo(){
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40 | return history.size()>0;
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41 | }
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42 |
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43 | bool ActionHistory::hasRedo(){
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44 | return yrotsih.size()>0;
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45 | }
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46 |
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47 | void ActionHistory::addElement(Action* action,Action::state_ptr state){
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48 | yrotsih.clear();
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49 | history.push_back(HistoryElement(action,state));
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50 | }
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51 |
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52 | void ActionHistory::clear(){
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53 | history.clear();
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54 | yrotsih.clear();
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55 | }
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56 |
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57 | void ActionHistory::init(){
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58 | ActionHistory *hist = new ActionHistory();
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59 | setInstance(hist);
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60 | new UndoAction(hist);
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61 | new RedoAction(hist);
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62 | }
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63 |
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64 | CONSTRUCT_SINGLETON(ActionHistory)
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65 |
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66 | /****************** Contained actions *******************/
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67 | ActionHistory::UndoAction::UndoAction(ActionHistory *_hist) :
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68 | Action("Undo"),
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69 | hist(_hist)
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70 | {}
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71 |
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72 | ActionHistory::UndoAction::~UndoAction(){}
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73 |
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74 | bool ActionHistory::UndoAction::canUndo(){
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75 | return false;
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76 | }
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77 |
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78 | bool ActionHistory::UndoAction::shouldUndo(){
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79 | return false;
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80 | }
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81 |
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82 | bool ActionHistory::UndoAction::isActive(){
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83 | return hist->hasUndo();
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84 | }
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85 |
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86 | Action::state_ptr ActionHistory::UndoAction::performCall(){
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87 | hist->undoLast();
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88 | return Action::success;
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89 | }
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90 |
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91 | Action::state_ptr ActionHistory::UndoAction::performUndo(Action::state_ptr){
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92 | ASSERT(0,"Cannot undo an undo (should use redo for this");
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93 | return Action::success;
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94 | }
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95 |
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96 | Action::state_ptr ActionHistory::UndoAction::performRedo(Action::state_ptr){
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97 | ASSERT(0,"Cannot redo an undo");
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98 | return Action::success;
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99 | }
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100 |
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101 | ActionHistory::RedoAction::RedoAction(ActionHistory *_hist) :
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102 | Action("Redo"),
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103 | hist(_hist)
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104 | {}
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105 |
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106 | ActionHistory::RedoAction::~RedoAction(){}
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107 |
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108 | bool ActionHistory::RedoAction::canUndo(){
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109 | return false;
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110 | }
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111 |
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112 | bool ActionHistory::RedoAction::shouldUndo(){
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113 | return false;
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114 | }
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115 |
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116 | bool ActionHistory::RedoAction::isActive(){
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117 | return hist->hasRedo();
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118 | }
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119 |
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120 | Action::state_ptr ActionHistory::RedoAction::performCall(){
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121 | hist->redoLast();
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122 | return Action::success;
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123 | }
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124 |
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125 | Action::state_ptr ActionHistory::RedoAction::performUndo(Action::state_ptr){
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126 | ASSERT(0,"Cannot undo a redo (should use undo for this");
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127 | return Action::success;
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128 | }
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129 |
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130 | Action::state_ptr ActionHistory::RedoAction::performRedo(Action::state_ptr){
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131 | ASSERT(0,"Cannot redo a redo");
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132 | return Action::success;
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133 | }
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