Mercurial > repos > IBBoard

annotate Commands/CommandStack.cs @ 27:4ea1fc351533

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Re #18 - Migrate XML tools * Add method to get an attribute as a boolean
author IBBoard <dev@ibboard.co.uk>
date Sat, 28 Mar 2009 20:54:01 +0000
parents 0352fa33ee8f
children cc7fae81afec
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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16
0352fa33ee8f Closes #8 - license code
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1 // This file (CommandStack.cs) is a part of the IBBoard library and is copyright 2009 IBBoard.
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2 //
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3 // The file and the library/program it is in are licensed under the GNU LGPL license, either version 3 of the License or (at your option) any later version. Please see COPYING.LGPL for more information and the full license.
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4
0
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5 using System;
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6 using System.Collections;
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7
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8 namespace IBBoard.Commands
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9 {
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10 /// <summary>
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11 /// Summary description for CommandStack.
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12 /// </summary>
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13 public class CommandStack
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14 {
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15 private ArrayList commandStack;
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16 private int listPos = -1;
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17 private int listMax = -1;
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18 private int cleanPos;
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19
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20 public event MethodInvoker CommandStackUpdated;
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21
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22 public CommandStack()
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23 {
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24 commandStack = new ArrayList(10);
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25 cleanPos = -1;
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26 }
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27
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28 public bool IsDirty()
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29 {
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30 return listPos!=cleanPos;
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31 }
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32
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33 public void setCleanMark()
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34 {
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35 cleanPos = listPos;
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36 }
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37
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38 public bool IsEmpty()
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39 {
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40 return listMax == -1;
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41 }
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42
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43 public bool CanUndo()
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44 {
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45 return listPos > -1;
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46 }
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47
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48 public int UndoLength
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49 {
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50 get { return listPos + 1; }
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51 }
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52
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53 public int RedoLength
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54 {
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55 get { return listMax - listPos; }
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56 }
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57
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58 public bool CanRedo()
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59 {
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60 return listPos < listMax;
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61 }
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62
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63 public void Reset()
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64 {
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65 commandStack.Clear();
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66 listMax = -1;
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67 listPos = -1;
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68 DoCommandStackUpdated();
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69 }
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70
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71 public void Undo()
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72 {
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73 if (CanUndo())
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74 {
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75 ((Command)commandStack[listPos]).Undo();
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76 listPos--;
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77 DoCommandStackUpdated();
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78 }
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79 else
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80 {
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81 throw new InvalidOperationException("Cannot undo action on empty command stack");
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82 }
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83 }
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84
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85 public void Redo()
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86 {
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87 if (CanRedo())
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88 {
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89 ((Command)commandStack[listPos+1]).Redo();
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90 listPos++;
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91 DoCommandStackUpdated();
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92 }
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93 else
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94 {
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95 throw new InvalidOperationException("No actions to redo");
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96 }
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97 }
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98
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99 public bool Execute(Command cmd)
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100 {
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101 if (cmd.CanExecute())
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102 {
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103 if (cmd.Execute())
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104 {
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105 //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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106 if (!CanRedo())
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107 {
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108 commandStack.Add(cmd);
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109 listPos++;
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110 }
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111 else
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112 {
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113 if (cleanPos>listPos)
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114 {
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115 cleanPos = -2;
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116 }
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117
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118 //else overwrite at our current position, setting the listMax value will ignore any commands we could have redone beyond here
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119 commandStack[++listPos] = cmd;
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120 }
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121
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122 listMax = listPos;
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123 DoCommandStackUpdated();
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124 return true;
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125 }
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126 else
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127 {
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128 throw new InvalidOperationException("Executable command failed to execute");
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129 }
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130 }
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131 else
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132 {
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133 return false;
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134 }
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135 }
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136
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137 protected void DoCommandStackUpdated()
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138 {
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139 if (CommandStackUpdated!=null)
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140 {
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141 CommandStackUpdated();
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142 }
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143 }
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144
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145 public Command PeekUndoCommand()
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146 {
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147 return PeekUndoCommand(1);
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148 }
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149
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150 public Command PeekUndoCommand(int backCount)
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151 {
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152 backCount = backCount - 1;
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153 if (backCount > -1 && backCount <= listPos)
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154 {
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155 return (Command)commandStack[listPos-backCount];
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156 }
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157 else
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158 {
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159 return null;
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160 }
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161 }
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162
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163 public Command PeekRedoCommand()
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164 {
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165 return PeekRedoCommand(1);
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166 }
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167
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168 public Command PeekRedoCommand(int forwardCount)
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169 {
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170 if (forwardCount > 0 && listPos+forwardCount <= listMax)
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171 {
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172 return (Command)commandStack[listPos+forwardCount];
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173 }
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174 else
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175 {
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176 return null;
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177 }
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IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
178 }
961030992bd2 Initial commit of IBBoard libraries
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
179 }
961030992bd2 Initial commit of IBBoard libraries
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
180 }