1 | // License: GPL. For details, see LICENSE file.
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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 | import java.util.Optional;
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8 |
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9 | import org.openstreetmap.josm.Main;
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10 | import org.openstreetmap.josm.command.Command;
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11 | import org.openstreetmap.josm.data.osm.DataSet;
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12 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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13 | import org.openstreetmap.josm.gui.MainApplication;
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14 | import org.openstreetmap.josm.gui.layer.Layer;
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15 | import org.openstreetmap.josm.gui.layer.LayerManager.LayerAddEvent;
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16 | import org.openstreetmap.josm.gui.layer.LayerManager.LayerChangeListener;
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17 | import org.openstreetmap.josm.gui.layer.LayerManager.LayerOrderChangeEvent;
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18 | import org.openstreetmap.josm.gui.layer.LayerManager.LayerRemoveEvent;
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19 | import org.openstreetmap.josm.gui.layer.OsmDataLayer;
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20 | import org.openstreetmap.josm.gui.layer.OsmDataLayer.CommandQueueListener;
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21 | import org.openstreetmap.josm.tools.CheckParameterUtil;
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22 |
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23 | /**
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24 | * This is the global undo/redo handler for all {@link OsmDataLayer}s.
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25 | * <p>
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26 | * If you want to change a data layer, you can use {@link #add(Command)} to execute a command on it and make that command undoable.
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27 | */
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28 | public class UndoRedoHandler implements LayerChangeListener {
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29 |
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30 | /**
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31 | * All commands that were made on the dataset. Don't write from outside!
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32 | *
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33 | * @see #getLastCommand()
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34 | */
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35 | public final LinkedList<Command> commands = new LinkedList<>();
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36 | /**
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37 | * The stack for redoing commands
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38 | */
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39 | public final LinkedList<Command> redoCommands = new LinkedList<>();
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40 |
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41 | private final LinkedList<CommandQueueListener> listenerCommands = new LinkedList<>();
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42 |
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43 | /**
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44 | * Constructs a new {@code UndoRedoHandler}.
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45 | */
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46 | public UndoRedoHandler() {
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47 | MainApplication.getLayerManager().addLayerChangeListener(this);
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48 | }
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49 |
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50 | /**
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51 | * Gets the last command that was executed on the command stack.
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52 | * @return That command or <code>null</code> if there is no such command.
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53 | * @since #12316
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54 | */
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55 | public Command getLastCommand() {
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56 | return commands.peekLast();
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57 | }
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58 |
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59 | /**
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60 | * Executes the command and add it to the intern command queue.
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61 | * @param c The command to execute. Must not be {@code null}.
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62 | */
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63 | public void addNoRedraw(final Command c) {
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64 | CheckParameterUtil.ensureParameterNotNull(c, "c");
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65 | c.executeCommand();
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66 | commands.add(c);
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67 | // Limit the number of commands in the undo list.
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68 | // Currently you have to undo the commands one by one. If
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69 | // this changes, a higher default value may be reasonable.
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70 | if (commands.size() > Main.pref.getInteger("undo.max", 1000)) {
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71 | commands.removeFirst();
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72 | }
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73 | redoCommands.clear();
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74 | }
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75 |
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76 | /**
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77 | * Fires a commands change event after adding a command.
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78 | */
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79 | public void afterAdd() {
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80 | fireCommandsChanged();
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81 | }
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82 |
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83 | /**
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84 | * Executes the command and add it to the intern command queue.
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85 | * @param c The command to execute. Must not be {@code null}.
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86 | */
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87 | public synchronized void add(final Command c) {
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88 | DataSet ds = Optional.ofNullable(c.getAffectedDataSet()).orElseGet(() -> MainApplication.getLayerManager().getEditDataSet());
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89 | Collection<? extends OsmPrimitive> oldSelection = null;
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90 | if (ds != null) {
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91 | oldSelection = ds.getSelected();
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92 | }
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93 | addNoRedraw(c);
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94 | c.invalidateAffectedLayers();
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95 | afterAdd();
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96 |
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97 | // the command may have changed the selection so tell the listeners about the current situation
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98 | if (ds != null) {
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99 | fireIfSelectionChanged(ds, oldSelection);
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100 | }
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101 | }
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102 |
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103 | /**
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104 | * Undoes the last added command.
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105 | */
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106 | public void undo() {
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107 | undo(1);
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108 | }
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109 |
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110 | /**
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111 | * Undoes multiple commands.
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112 | * @param num The number of commands to undo
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113 | */
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114 | public synchronized void undo(int num) {
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115 | if (commands.isEmpty())
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116 | return;
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117 | DataSet ds = MainApplication.getLayerManager().getEditDataSet();
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118 | Collection<? extends OsmPrimitive> oldSelection = null;
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119 | if (ds != null) {
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120 | oldSelection = ds.getSelected();
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121 | ds.beginUpdate();
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122 | }
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123 | try {
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124 | for (int i = 1; i <= num; ++i) {
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125 | final Command c = commands.removeLast();
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126 | c.undoCommand();
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127 | c.invalidateAffectedLayers();
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128 | redoCommands.addFirst(c);
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129 | if (commands.isEmpty()) {
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130 | break;
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131 | }
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132 | }
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133 | } finally {
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134 | if (ds != null) {
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135 | ds.endUpdate();
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136 | }
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137 | }
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138 | fireCommandsChanged();
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139 | if (ds != null) {
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140 | fireIfSelectionChanged(ds, oldSelection);
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141 | }
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142 | }
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143 |
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144 | /**
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145 | * Redoes the last undoed command.
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146 | */
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147 | public void redo() {
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148 | redo(1);
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149 | }
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150 |
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151 | /**
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152 | * Redoes multiple commands.
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153 | * @param num The number of commands to redo
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154 | */
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155 | public void redo(int num) {
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156 | if (redoCommands.isEmpty())
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157 | return;
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158 | DataSet ds = MainApplication.getLayerManager().getEditDataSet();
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159 | Collection<? extends OsmPrimitive> oldSelection = ds.getSelected();
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160 | for (int i = 0; i < num; ++i) {
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161 | final Command c = redoCommands.removeFirst();
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162 | c.executeCommand();
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163 | c.invalidateAffectedLayers();
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164 | commands.add(c);
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165 | if (redoCommands.isEmpty()) {
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166 | break;
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167 | }
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168 | }
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169 | fireCommandsChanged();
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170 | fireIfSelectionChanged(ds, oldSelection);
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171 | }
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172 |
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173 | private static void fireIfSelectionChanged(DataSet ds, Collection<? extends OsmPrimitive> oldSelection) {
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174 | Collection<? extends OsmPrimitive> newSelection = ds.getSelected();
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175 | if (!oldSelection.equals(newSelection)) {
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176 | ds.fireSelectionChanged();
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177 | }
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178 | }
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179 |
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180 | /**
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181 | * Fires a command change to all listeners.
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182 | */
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183 | private void fireCommandsChanged() {
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184 | for (final CommandQueueListener l : listenerCommands) {
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185 | l.commandChanged(commands.size(), redoCommands.size());
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186 | }
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187 | }
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188 |
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189 | /**
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190 | * Resets the undo/redo list.
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191 | */
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192 | public void clean() {
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193 | redoCommands.clear();
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194 | commands.clear();
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195 | fireCommandsChanged();
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196 | }
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197 |
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198 | /**
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199 | * Resets all commands that affect the given layer.
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200 | * @param layer The layer that was affected.
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201 | */
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202 | public void clean(Layer layer) {
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203 | if (layer == null)
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204 | return;
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205 | boolean changed = false;
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206 | for (Iterator<Command> it = commands.iterator(); it.hasNext();) {
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207 | if (it.next().invalidBecauselayerRemoved(layer)) {
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208 | it.remove();
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209 | changed = true;
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210 | }
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211 | }
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212 | for (Iterator<Command> it = redoCommands.iterator(); it.hasNext();) {
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213 | if (it.next().invalidBecauselayerRemoved(layer)) {
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214 | it.remove();
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215 | changed = true;
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216 | }
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217 | }
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218 | if (changed) {
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219 | fireCommandsChanged();
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220 | }
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221 | }
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222 |
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223 | @Override
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224 | public void layerRemoving(LayerRemoveEvent e) {
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225 | clean(e.getRemovedLayer());
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226 | }
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227 |
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228 | @Override
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229 | public void layerAdded(LayerAddEvent e) {
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230 | // Do nothing
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231 | }
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232 |
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233 | @Override
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234 | public void layerOrderChanged(LayerOrderChangeEvent e) {
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235 | // Do nothing
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236 | }
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237 |
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238 | /**
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239 | * Removes a command queue listener.
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240 | * @param l The command queue listener to remove
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241 | */
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242 | public void removeCommandQueueListener(CommandQueueListener l) {
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243 | listenerCommands.remove(l);
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244 | }
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245 |
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246 | /**
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247 | * Adds a command queue listener.
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248 | * @param l The commands queue listener to add
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249 | * @return {@code true} if the listener has been added, {@code false} otherwise
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250 | */
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251 | public boolean addCommandQueueListener(CommandQueueListener l) {
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252 | return listenerCommands.add(l);
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253 | }
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254 | }
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