1 | //License: GPL. Copyright 2007 by Immanuel Scholz and others
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2 | package org.openstreetmap.josm.data;
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3 |
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4 | import java.util.Collection;
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5 | import java.util.Iterator;
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6 | import java.util.LinkedList;
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7 |
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8 | import org.openstreetmap.josm.Main;
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9 | import org.openstreetmap.josm.command.Command;
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10 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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11 | import org.openstreetmap.josm.gui.MapView;
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12 | import org.openstreetmap.josm.gui.layer.Layer;
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13 | import org.openstreetmap.josm.gui.layer.OsmDataLayer.CommandQueueListener;
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14 |
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15 | public class UndoRedoHandler implements MapView.LayerChangeListener {
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16 |
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17 | /**
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18 | * All commands that were made on the dataset. Don't write from outside!
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19 | */
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20 | public final LinkedList<Command> commands = new LinkedList<Command>();
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21 | /**
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22 | * The stack for redoing commands
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23 | */
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24 | public final LinkedList<Command> redoCommands = new LinkedList<Command>();
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25 |
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26 | private final LinkedList<CommandQueueListener> listenerCommands = new LinkedList<CommandQueueListener>();
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27 |
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28 | public UndoRedoHandler() {
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29 | MapView.addLayerChangeListener(this);
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30 | }
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31 |
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32 | /**
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33 | * Execute the command and add it to the intern command queue.
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34 | */
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35 | public void addNoRedraw(final Command c) {
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36 | c.executeCommand();
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37 | commands.add(c);
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38 | // Limit the number of commands in the undo list.
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39 | // Currently you have to undo the commands one by one. If
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40 | // this changes, a higher default value may be reasonable.
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41 | if (commands.size() > Main.pref.getInteger("undo.max", 1000)) {
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42 | commands.removeFirst();
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43 | }
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44 | redoCommands.clear();
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45 | }
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46 |
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47 | public void afterAdd() {
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48 | fireCommandsChanged();
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49 |
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50 | // the command may have changed the selection so tell the listeners about the current situation
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51 | Main.main.getCurrentDataSet().fireSelectionChanged();
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52 | }
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53 |
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54 | /**
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55 | * Execute the command and add it to the intern command queue.
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56 | */
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57 | synchronized public void add(final Command c) {
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58 | addNoRedraw(c);
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59 | afterAdd();
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60 | }
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61 |
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62 | /**
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63 | * Undoes the last added command.
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64 | */
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65 | public void undo() {
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66 | undo(1);
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67 | }
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68 |
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69 | /**
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70 | * Undoes multiple commands.
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71 | */
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72 | synchronized public void undo(int num) {
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73 | if (commands.isEmpty())
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74 | return;
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75 | Collection<? extends OsmPrimitive> oldSelection = Main.main.getCurrentDataSet().getSelected();
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76 | Main.main.getCurrentDataSet().beginUpdate();
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77 | try {
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78 | for (int i=1; i<=num; ++i) {
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79 | final Command c = commands.removeLast();
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80 | c.undoCommand();
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81 | redoCommands.addFirst(c);
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82 | if (commands.isEmpty()) {
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83 | break;
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84 | }
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85 | }
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86 | }
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87 | finally {
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88 | Main.main.getCurrentDataSet().endUpdate();
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89 | }
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90 | fireCommandsChanged();
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91 | Collection<? extends OsmPrimitive> newSelection = Main.main.getCurrentDataSet().getSelected();
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92 | if (!oldSelection.equals(newSelection)) {
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93 | Main.main.getCurrentDataSet().fireSelectionChanged();
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94 | }
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95 | }
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96 |
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97 | /**
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98 | * Redoes the last undoed command.
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99 | */
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100 | public void redo() {
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101 | redo(1);
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102 | }
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103 |
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104 | /**
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105 | * Redoes multiple commands.
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106 | */
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107 | public void redo(int num) {
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108 | if (redoCommands.isEmpty())
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109 | return;
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110 | Collection<? extends OsmPrimitive> oldSelection = Main.main.getCurrentDataSet().getSelected();
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111 | for (int i=0; i<num; ++i) {
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112 | final Command c = redoCommands.removeFirst();
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113 | c.executeCommand();
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114 | commands.add(c);
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115 | if (redoCommands.isEmpty()) {
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116 | break;
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117 | }
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118 | }
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119 | fireCommandsChanged();
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120 | Collection<? extends OsmPrimitive> newSelection = Main.main.getCurrentDataSet().getSelected();
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121 | if (!oldSelection.equals(newSelection)) {
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122 | Main.main.getCurrentDataSet().fireSelectionChanged();
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123 | }
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124 | }
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125 |
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126 | public void fireCommandsChanged() {
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127 | for (final CommandQueueListener l : listenerCommands) {
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128 | l.commandChanged(commands.size(), redoCommands.size());
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129 | }
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130 | }
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131 |
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132 | public void clean() {
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133 | redoCommands.clear();
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134 | commands.clear();
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135 | fireCommandsChanged();
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136 | }
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137 |
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138 | public void clean(Layer layer) {
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139 | if (layer == null)
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140 | return;
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141 | boolean changed = false;
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142 | for (Iterator<Command> it = commands.iterator(); it.hasNext();) {
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143 | if (it.next().invalidBecauselayerRemoved(layer)) {
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144 | it.remove();
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145 | changed = true;
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146 | }
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147 | }
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148 | for (Iterator<Command> it = redoCommands.iterator(); it.hasNext();) {
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149 | if (it.next().invalidBecauselayerRemoved(layer)) {
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150 | it.remove();
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151 | changed = true;
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152 | }
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153 | }
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154 | if (changed) {
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155 | fireCommandsChanged();
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156 | }
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157 | }
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158 |
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159 | public void layerRemoved(Layer oldLayer) {
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160 | clean(oldLayer);
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161 | }
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162 |
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163 | public void layerAdded(Layer newLayer) {}
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164 | public void activeLayerChange(Layer oldLayer, Layer newLayer) {}
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165 |
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166 | public void removeCommandQueueListener(CommandQueueListener l) {
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167 | listenerCommands.remove(l);
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168 | }
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169 |
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170 | public boolean addCommandQueueListener(CommandQueueListener l) {
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171 | return listenerCommands.add(l);
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172 | }
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173 | }
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