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annotate Commands/CommandStack.cs @ 0:961030992bd2

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Initial commit of IBBoard libraries
author IBBoard <dev@ibboard.co.uk>
date Fri, 19 Dec 2008 11:13:48 +0000
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children 0352fa33ee8f
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961030992bd2 Initial commit of IBBoard libraries
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1 using System;
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2 using System.Collections;
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3
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4 namespace IBBoard.Commands
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5 {
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6 /// <summary>
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7 /// Summary description for CommandStack.
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8 /// </summary>
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9 public class CommandStack
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10 {
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11 private ArrayList commandStack;
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12 private int listPos = -1;
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13 private int listMax = -1;
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14 private int cleanPos;
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15
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16 public event MethodInvoker CommandStackUpdated;
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17
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18 public CommandStack()
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19 {
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20 commandStack = new ArrayList(10);
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21 cleanPos = -1;
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22 }
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23
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24 public bool IsDirty()
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25 {
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26 return listPos!=cleanPos;
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27 }
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28
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29 public void setCleanMark()
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30 {
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31 cleanPos = listPos;
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32 }
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33
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34 public bool IsEmpty()
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35 {
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36 return listMax == -1;
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37 }
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38
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39 public bool CanUndo()
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40 {
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41 return listPos > -1;
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42 }
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43
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44 public int UndoLength
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45 {
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46 get { return listPos + 1; }
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47 }
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48
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49 public int RedoLength
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50 {
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51 get { return listMax - listPos; }
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52 }
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53
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54 public bool CanRedo()
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55 {
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56 return listPos < listMax;
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57 }
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58
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59 public void Reset()
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60 {
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61 commandStack.Clear();
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62 listMax = -1;
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63 listPos = -1;
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64 DoCommandStackUpdated();
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65 }
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66
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67 public void Undo()
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68 {
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69 if (CanUndo())
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70 {
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71 ((Command)commandStack[listPos]).Undo();
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72 listPos--;
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73 DoCommandStackUpdated();
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74 }
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75 else
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76 {
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77 throw new InvalidOperationException("Cannot undo action on empty command stack");
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78 }
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79 }
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80
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81 public void Redo()
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82 {
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83 if (CanRedo())
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84 {
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85 ((Command)commandStack[listPos+1]).Redo();
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86 listPos++;
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87 DoCommandStackUpdated();
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88 }
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89 else
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90 {
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91 throw new InvalidOperationException("No actions to redo");
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92 }
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93 }
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94
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95 public bool Execute(Command cmd)
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96 {
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97 if (cmd.CanExecute())
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98 {
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99 if (cmd.Execute())
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100 {
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101 //if we can't redo, i.e. there's no commands beyond our current point, add to the end else insert
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102 if (!CanRedo())
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103 {
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104 commandStack.Add(cmd);
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105 listPos++;
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106 }
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107 else
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108 {
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109 if (cleanPos>listPos)
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110 {
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111 cleanPos = -2;
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112 }
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113
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114 //else overwrite at our current position, setting the listMax value will ignore any commands we could have redone beyond here
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115 commandStack[++listPos] = cmd;
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116 }
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117
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118 listMax = listPos;
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119 DoCommandStackUpdated();
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120 return true;
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121 }
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122 else
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123 {
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124 throw new InvalidOperationException("Executable command failed to execute");
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125 }
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126 }
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127 else
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128 {
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129 return false;
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130 }
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131 }
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132
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133 protected void DoCommandStackUpdated()
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134 {
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135 if (CommandStackUpdated!=null)
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136 {
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137 CommandStackUpdated();
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138 }
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139 }
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140
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141 public Command PeekUndoCommand()
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142 {
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143 return PeekUndoCommand(1);
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144 }
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145
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146 public Command PeekUndoCommand(int backCount)
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147 {
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148 backCount = backCount - 1;
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149 if (backCount > -1 && backCount <= listPos)
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150 {
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151 return (Command)commandStack[listPos-backCount];
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152 }
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153 else
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154 {
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155 return null;
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156 }
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157 }
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158
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159 public Command PeekRedoCommand()
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160 {
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161 return PeekRedoCommand(1);
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162 }
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163
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164 public Command PeekRedoCommand(int forwardCount)
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165 {
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166 if (forwardCount > 0 && listPos+forwardCount <= listMax)
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167 {
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168 return (Command)commandStack[listPos+forwardCount];
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169 }
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170 else
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171 {
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172 return null;
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173 }
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174 }
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175 }
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176 }