[304] | 1 | //License: GPL. Copyright 2007 by Immanuel Scholz and others
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[301] | 2 | package org.openstreetmap.josm.data;
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| 3 |
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[304] | 4 | import java.util.Iterator;
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[301] | 5 | import java.util.LinkedList;
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| 6 | import java.util.Stack;
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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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[304] | 10 | import org.openstreetmap.josm.gui.layer.Layer;
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[301] | 11 | import org.openstreetmap.josm.gui.layer.OsmDataLayer;
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[304] | 12 | import org.openstreetmap.josm.gui.layer.Layer.LayerChangeListener;
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[301] | 13 | import org.openstreetmap.josm.gui.layer.OsmDataLayer.CommandQueueListener;
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| 14 |
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[304] | 15 | public class UndoRedoHandler implements LayerChangeListener {
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[301] | 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 | private final Stack<Command> redoCommands = new Stack<Command>();
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| 25 |
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| 26 | public final LinkedList<CommandQueueListener> listenerCommands = new LinkedList<CommandQueueListener>();
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| 27 |
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| 28 |
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[304] | 29 | public UndoRedoHandler() {
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| 30 | Layer.listeners.add(this);
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| 31 | }
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| 32 |
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| 33 |
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[301] | 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 add(final Command c) {
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| 38 | c.executeCommand();
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| 39 | commands.add(c);
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| 40 | redoCommands.clear();
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| 41 | if (Main.map != null && Main.map.mapView.getActiveLayer() instanceof OsmDataLayer) {
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| 42 | OsmDataLayer data = (OsmDataLayer)Main.map.mapView.getActiveLayer();
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| 43 | data.setModified(true);
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[348] | 44 | data.fireDataChange();
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[301] | 45 | }
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| 46 | fireCommandsChanged();
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| 47 | }
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[304] | 48 |
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[301] | 49 | /**
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| 50 | * Undoes the last added command.
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| 51 | */
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| 52 | public void undo() {
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| 53 | if (commands.isEmpty())
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| 54 | return;
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| 55 | final Command c = commands.removeLast();
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| 56 | c.undoCommand();
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| 57 | redoCommands.push(c);
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| 58 | if (Main.map != null && Main.map.mapView.getActiveLayer() instanceof OsmDataLayer) {
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| 59 | OsmDataLayer data = (OsmDataLayer)Main.map.mapView.getActiveLayer();
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| 60 | data.setModified(data.uploadedModified || !commands.isEmpty());
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[348] | 61 | data.fireDataChange();
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[301] | 62 | }
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[661] | 63 | fireCommandsChanged();
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[301] | 64 | Main.ds.setSelected();
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| 65 | }
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| 66 |
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| 67 | /**
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| 68 | * Redoes the last undoed command.
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| 69 | * TODO: This has to be moved to a central place in order to support multiple layers.
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| 70 | */
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| 71 | public void redo() {
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| 72 | if (redoCommands.isEmpty())
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| 73 | return;
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| 74 | final Command c = redoCommands.pop();
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| 75 | c.executeCommand();
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| 76 | commands.add(c);
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| 77 | if (Main.map != null && Main.map.mapView.getActiveLayer() instanceof OsmDataLayer) {
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| 78 | OsmDataLayer data = (OsmDataLayer)Main.map.mapView.getActiveLayer();
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| 79 | data.setModified(true);
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[348] | 80 | data.fireDataChange();
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[301] | 81 | }
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[661] | 82 | fireCommandsChanged();
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[301] | 83 | }
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| 84 |
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| 85 | public void fireCommandsChanged() {
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| 86 | for (final CommandQueueListener l : listenerCommands)
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| 87 | l.commandChanged(commands.size(), redoCommands.size());
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| 88 | }
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| 89 |
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| 90 | public void clean() {
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| 91 | redoCommands.clear();
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| 92 | commands.clear();
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| 93 | fireCommandsChanged();
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[304] | 94 | }
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| 95 |
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| 96 | public void layerRemoved(Layer oldLayer) {
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| 97 | boolean changed = false;
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| 98 | for (Iterator<Command> it = commands.iterator(); it.hasNext();) {
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| 99 | if (it.next().invalidBecauselayerRemoved(oldLayer)) {
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| 100 | it.remove();
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| 101 | changed = true;
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| 102 | }
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| 103 | }
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| 104 | for (Iterator<Command> it = redoCommands.iterator(); it.hasNext();) {
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| 105 | if (it.next().invalidBecauselayerRemoved(oldLayer)) {
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| 106 | it.remove();
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| 107 | changed = true;
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| 108 | }
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| 109 | }
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| 110 | if (changed)
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| 111 | fireCommandsChanged();
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| 112 | }
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| 113 |
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| 114 | public void layerAdded(Layer newLayer) {}
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| 115 | public void activeLayerChange(Layer oldLayer, Layer newLayer) {}
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[301] | 116 | }
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