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 | import java.util.Stack;
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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.OsmPrimitive;
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12 | import org.openstreetmap.josm.gui.MapView;
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13 | import org.openstreetmap.josm.gui.layer.Layer;
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14 | import org.openstreetmap.josm.gui.layer.OsmDataLayer;
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15 | import org.openstreetmap.josm.gui.layer.OsmDataLayer.CommandQueueListener;
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16 |
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17 | public class UndoRedoHandler implements MapView.LayerChangeListener {
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18 |
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19 | /**
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20 | * All commands that were made on the dataset. Don't write from outside!
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21 | */
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22 | public final LinkedList<Command> commands = new LinkedList<Command>();
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23 | /**
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24 | * The stack for redoing commands
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25 | */
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26 | private final Stack<Command> redoCommands = new Stack<Command>();
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27 |
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28 | public final LinkedList<CommandQueueListener> listenerCommands = new LinkedList<CommandQueueListener>();
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29 |
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30 | public UndoRedoHandler() {
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31 | MapView.addLayerChangeListener(this);
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32 | }
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33 |
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34 | /**
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35 | * Execute the command and add it to the intern command queue.
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36 | */
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37 | public void addNoRedraw(final Command c) {
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38 | c.executeCommand();
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39 | commands.add(c);
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40 | // Limit the number of commands in the undo list.
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41 | // Currently you have to undo the commands one by one. If
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42 | // this changes, a higher default value may be reasonable.
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43 | if (commands.size() > Main.pref.getInteger("undo.max", 1000)) {
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44 | commands.removeFirst();
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45 | }
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46 | redoCommands.clear();
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47 | }
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48 |
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49 | public void afterAdd() {
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50 | if (Main.map != null && Main.map.mapView.getActiveLayer() instanceof OsmDataLayer) {
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51 | OsmDataLayer data = (OsmDataLayer)Main.map.mapView.getActiveLayer();
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52 | data.fireDataChange();
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53 | }
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54 | fireCommandsChanged();
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55 |
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56 | // the command may have changed the selection so tell the listeners about the current situation
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57 | Main.main.getCurrentDataSet().fireSelectionChanged();
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58 | }
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59 |
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60 | /**
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61 | * Execute the command and add it to the intern command queue.
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62 | */
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63 | synchronized public void add(final Command c) {
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64 | addNoRedraw(c);
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65 | afterAdd();
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66 | }
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67 |
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68 | /**
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69 | * Undoes the last added command.
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70 | */
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71 | synchronized public void undo() {
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72 | if (commands.isEmpty())
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73 | return;
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74 | Collection<? extends OsmPrimitive> oldSelection = Main.main.getCurrentDataSet().getSelected();
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75 | final Command c = commands.removeLast();
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76 | c.undoCommand();
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77 | redoCommands.push(c);
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78 | if (Main.map != null && Main.map.mapView.getActiveLayer() instanceof OsmDataLayer) {
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79 | OsmDataLayer data = (OsmDataLayer)Main.map.mapView.getActiveLayer();
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80 | data.fireDataChange();
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81 | }
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82 | fireCommandsChanged();
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83 | Collection<? extends OsmPrimitive> newSelection = Main.main.getCurrentDataSet().getSelected();
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84 | if (!oldSelection.equals(newSelection)) {
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85 | Main.main.getCurrentDataSet().fireSelectionChanged();
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86 | }
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87 | }
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88 |
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89 | /**
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90 | * Redoes the last undoed command.
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91 | * TODO: This has to be moved to a central place in order to support multiple layers.
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92 | */
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93 | public void redo() {
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94 | if (redoCommands.isEmpty())
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95 | return;
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96 | Collection<? extends OsmPrimitive> oldSelection = Main.main.getCurrentDataSet().getSelected();
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97 | final Command c = redoCommands.pop();
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98 | c.executeCommand();
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99 | commands.add(c);
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100 | if (Main.map != null && Main.map.mapView.getActiveLayer() instanceof OsmDataLayer) {
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101 | OsmDataLayer data = (OsmDataLayer)Main.map.mapView.getActiveLayer();
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102 | data.fireDataChange();
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103 | }
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104 | fireCommandsChanged();
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105 | Collection<? extends OsmPrimitive> newSelection = Main.main.getCurrentDataSet().getSelected();
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106 | if (!oldSelection.equals(newSelection)) {
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107 | Main.main.getCurrentDataSet().fireSelectionChanged();
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108 | }
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109 | }
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110 |
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111 | public void fireCommandsChanged() {
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112 | for (final CommandQueueListener l : listenerCommands) {
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113 | l.commandChanged(commands.size(), redoCommands.size());
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114 | }
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115 | }
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116 |
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117 | public void clean() {
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118 | redoCommands.clear();
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119 | commands.clear();
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120 | fireCommandsChanged();
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121 | }
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122 |
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123 | public void clean(Layer layer) {
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124 | if (layer == null)
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125 | return;
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126 | boolean changed = false;
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127 | for (Iterator<Command> it = commands.iterator(); it.hasNext();) {
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128 | if (it.next().invalidBecauselayerRemoved(layer)) {
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129 | it.remove();
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130 | changed = true;
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131 | }
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132 | }
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133 | for (Iterator<Command> it = redoCommands.iterator(); it.hasNext();) {
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134 | if (it.next().invalidBecauselayerRemoved(layer)) {
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135 | it.remove();
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136 | changed = true;
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137 | }
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138 | }
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139 | if (changed) {
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140 | fireCommandsChanged();
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141 | }
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142 | }
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143 |
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144 | public void layerRemoved(Layer oldLayer) {
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145 | clean(oldLayer);
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146 | }
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147 |
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148 | public void layerAdded(Layer newLayer) {}
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149 | public void activeLayerChange(Layer oldLayer, Layer newLayer) {}
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150 | }
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