1 | // License: GPL. For details, see LICENSE file.
|
---|
2 | package org.openstreetmap.josm.data;
|
---|
3 |
|
---|
4 | import java.util.EventObject;
|
---|
5 | import java.util.Iterator;
|
---|
6 | import java.util.LinkedList;
|
---|
7 | import java.util.Objects;
|
---|
8 |
|
---|
9 | import org.openstreetmap.josm.Main;
|
---|
10 | import org.openstreetmap.josm.command.Command;
|
---|
11 | import org.openstreetmap.josm.data.osm.DataSet;
|
---|
12 | import org.openstreetmap.josm.spi.preferences.Config;
|
---|
13 | import org.openstreetmap.josm.tools.CheckParameterUtil;
|
---|
14 |
|
---|
15 | /**
|
---|
16 | * This is the global undo/redo handler for all {@link DataSet}s.
|
---|
17 | * <p>
|
---|
18 | * If you want to change a data set, you can use {@link #add(Command)} to execute a command on it and make that command undoable.
|
---|
19 | */
|
---|
20 | public class UndoRedoHandler {
|
---|
21 |
|
---|
22 | /**
|
---|
23 | * All commands that were made on the dataset. Don't write from outside!
|
---|
24 | *
|
---|
25 | * @see #getLastCommand()
|
---|
26 | */
|
---|
27 | public final LinkedList<Command> commands = new LinkedList<>();
|
---|
28 | /**
|
---|
29 | * The stack for redoing commands
|
---|
30 | */
|
---|
31 | public final LinkedList<Command> redoCommands = new LinkedList<>();
|
---|
32 |
|
---|
33 | private final LinkedList<CommandQueueListener> listenerCommands = new LinkedList<>();
|
---|
34 | private final LinkedList<CommandQueuePreciseListener> preciseListenerCommands = new LinkedList<>();
|
---|
35 |
|
---|
36 | /**
|
---|
37 | * Constructs a new {@code UndoRedoHandler}.
|
---|
38 | */
|
---|
39 | public UndoRedoHandler() {
|
---|
40 | // Do nothing
|
---|
41 | }
|
---|
42 |
|
---|
43 | /**
|
---|
44 | * A simple listener that gets notified of command queue (undo/redo) size changes.
|
---|
45 | * @see CommandQueuePreciseListener
|
---|
46 | * @since 12718 (moved from {@code OsmDataLayer}
|
---|
47 | */
|
---|
48 | @FunctionalInterface
|
---|
49 | public interface CommandQueueListener {
|
---|
50 | /**
|
---|
51 | * Notifies the listener about the new queue size
|
---|
52 | * @param queueSize Undo stack size
|
---|
53 | * @param redoSize Redo stack size
|
---|
54 | */
|
---|
55 | void commandChanged(int queueSize, int redoSize);
|
---|
56 | }
|
---|
57 |
|
---|
58 | /**
|
---|
59 | * A listener that gets notified of command queue (undo/redo) operations individually.
|
---|
60 | * @see CommandQueueListener
|
---|
61 | * @since 13729
|
---|
62 | */
|
---|
63 | public interface CommandQueuePreciseListener {
|
---|
64 |
|
---|
65 | /**
|
---|
66 | * Notifies the listener about a new command added to the queue.
|
---|
67 | * @param e event
|
---|
68 | */
|
---|
69 | void commandAdded(CommandAddedEvent e);
|
---|
70 |
|
---|
71 | /**
|
---|
72 | * Notifies the listener about commands being cleaned.
|
---|
73 | * @param e event
|
---|
74 | */
|
---|
75 | void cleaned(CommandQueueCleanedEvent e);
|
---|
76 |
|
---|
77 | /**
|
---|
78 | * Notifies the listener about a command that has been undone.
|
---|
79 | * @param e event
|
---|
80 | */
|
---|
81 | void commandUndone(CommandUndoneEvent e);
|
---|
82 |
|
---|
83 | /**
|
---|
84 | * Notifies the listener about a command that has been redone.
|
---|
85 | * @param e event
|
---|
86 | */
|
---|
87 | void commandRedone(CommandRedoneEvent e);
|
---|
88 | }
|
---|
89 |
|
---|
90 | abstract static class CommandQueueEvent extends EventObject {
|
---|
91 | protected CommandQueueEvent(UndoRedoHandler source) {
|
---|
92 | super(Objects.requireNonNull(source));
|
---|
93 | }
|
---|
94 |
|
---|
95 | /**
|
---|
96 | * Calls the appropriate method of the listener for this event.
|
---|
97 | * @param listener dataset listener to notify about this event
|
---|
98 | */
|
---|
99 | abstract void fire(CommandQueuePreciseListener listener);
|
---|
100 |
|
---|
101 | @Override
|
---|
102 | public final UndoRedoHandler getSource() {
|
---|
103 | return (UndoRedoHandler) super.getSource();
|
---|
104 | }
|
---|
105 | }
|
---|
106 |
|
---|
107 | /**
|
---|
108 | * Event fired after a command has been added to the command queue.
|
---|
109 | * @since 13729
|
---|
110 | */
|
---|
111 | public static final class CommandAddedEvent extends CommandQueueEvent {
|
---|
112 |
|
---|
113 | private static final long serialVersionUID = 1L;
|
---|
114 | private final Command cmd;
|
---|
115 |
|
---|
116 | private CommandAddedEvent(UndoRedoHandler source, Command cmd) {
|
---|
117 | super(source);
|
---|
118 | this.cmd = Objects.requireNonNull(cmd);
|
---|
119 | }
|
---|
120 |
|
---|
121 | /**
|
---|
122 | * Returns the added command.
|
---|
123 | * @return the added command
|
---|
124 | */
|
---|
125 | public Command getCommand() {
|
---|
126 | return cmd;
|
---|
127 | }
|
---|
128 |
|
---|
129 | @Override
|
---|
130 | void fire(CommandQueuePreciseListener listener) {
|
---|
131 | listener.commandAdded(this);
|
---|
132 | }
|
---|
133 | }
|
---|
134 |
|
---|
135 | /**
|
---|
136 | * Event fired after the command queue has been cleaned.
|
---|
137 | * @since 13729
|
---|
138 | */
|
---|
139 | public static final class CommandQueueCleanedEvent extends CommandQueueEvent {
|
---|
140 |
|
---|
141 | private static final long serialVersionUID = 1L;
|
---|
142 | private final DataSet ds;
|
---|
143 |
|
---|
144 | private CommandQueueCleanedEvent(UndoRedoHandler source, DataSet ds) {
|
---|
145 | super(source);
|
---|
146 | this.ds = ds;
|
---|
147 | }
|
---|
148 |
|
---|
149 | /**
|
---|
150 | * Returns the affected dataset.
|
---|
151 | * @return the affected dataset, or null if the queue has been globally emptied
|
---|
152 | */
|
---|
153 | public DataSet getDataSet() {
|
---|
154 | return ds;
|
---|
155 | }
|
---|
156 |
|
---|
157 | @Override
|
---|
158 | void fire(CommandQueuePreciseListener listener) {
|
---|
159 | listener.cleaned(this);
|
---|
160 | }
|
---|
161 | }
|
---|
162 |
|
---|
163 | /**
|
---|
164 | * Event fired after a command has been undone.
|
---|
165 | * @since 13729
|
---|
166 | */
|
---|
167 | public static final class CommandUndoneEvent extends CommandQueueEvent {
|
---|
168 |
|
---|
169 | private static final long serialVersionUID = 1L;
|
---|
170 | private final Command cmd;
|
---|
171 |
|
---|
172 | private CommandUndoneEvent(UndoRedoHandler source, Command cmd) {
|
---|
173 | super(source);
|
---|
174 | this.cmd = Objects.requireNonNull(cmd);
|
---|
175 | }
|
---|
176 |
|
---|
177 | /**
|
---|
178 | * Returns the undone command.
|
---|
179 | * @return the undone command
|
---|
180 | */
|
---|
181 | public Command getCommand() {
|
---|
182 | return cmd;
|
---|
183 | }
|
---|
184 |
|
---|
185 | @Override
|
---|
186 | void fire(CommandQueuePreciseListener listener) {
|
---|
187 | listener.commandUndone(this);
|
---|
188 | }
|
---|
189 | }
|
---|
190 |
|
---|
191 | /**
|
---|
192 | * Event fired after a command has been redone.
|
---|
193 | * @since 13729
|
---|
194 | */
|
---|
195 | public static final class CommandRedoneEvent extends CommandQueueEvent {
|
---|
196 |
|
---|
197 | private static final long serialVersionUID = 1L;
|
---|
198 | private final Command cmd;
|
---|
199 |
|
---|
200 | private CommandRedoneEvent(UndoRedoHandler source, Command cmd) {
|
---|
201 | super(source);
|
---|
202 | this.cmd = Objects.requireNonNull(cmd);
|
---|
203 | }
|
---|
204 |
|
---|
205 | /**
|
---|
206 | * Returns the redone command.
|
---|
207 | * @return the redone command
|
---|
208 | */
|
---|
209 | public Command getCommand() {
|
---|
210 | return cmd;
|
---|
211 | }
|
---|
212 |
|
---|
213 | @Override
|
---|
214 | void fire(CommandQueuePreciseListener listener) {
|
---|
215 | listener.commandRedone(this);
|
---|
216 | }
|
---|
217 | }
|
---|
218 |
|
---|
219 | /**
|
---|
220 | * Gets the last command that was executed on the command stack.
|
---|
221 | * @return That command or <code>null</code> if there is no such command.
|
---|
222 | * @since #12316
|
---|
223 | */
|
---|
224 | public Command getLastCommand() {
|
---|
225 | return commands.peekLast();
|
---|
226 | }
|
---|
227 |
|
---|
228 | /**
|
---|
229 | * Executes the command and add it to the intern command queue.
|
---|
230 | * @param c The command to execute. Must not be {@code null}.
|
---|
231 | */
|
---|
232 | public void addNoRedraw(final Command c) {
|
---|
233 | CheckParameterUtil.ensureParameterNotNull(c, "c");
|
---|
234 | c.executeCommand();
|
---|
235 | commands.add(c);
|
---|
236 | // Limit the number of commands in the undo list.
|
---|
237 | // Currently you have to undo the commands one by one. If
|
---|
238 | // this changes, a higher default value may be reasonable.
|
---|
239 | if (commands.size() > Config.getPref().getInt("undo.max", 1000)) {
|
---|
240 | commands.removeFirst();
|
---|
241 | }
|
---|
242 | redoCommands.clear();
|
---|
243 | }
|
---|
244 |
|
---|
245 | /**
|
---|
246 | * Fires a commands change event after adding a command.
|
---|
247 | * @param cmd command added
|
---|
248 | * @since 13729
|
---|
249 | */
|
---|
250 | public void afterAdd(Command cmd) {
|
---|
251 | if (cmd != null) {
|
---|
252 | fireEvent(new CommandAddedEvent(this, cmd));
|
---|
253 | }
|
---|
254 | fireCommandsChanged();
|
---|
255 | }
|
---|
256 |
|
---|
257 | /**
|
---|
258 | * Executes the command and add it to the intern command queue.
|
---|
259 | * @param c The command to execute. Must not be {@code null}.
|
---|
260 | */
|
---|
261 | public synchronized void add(final Command c) {
|
---|
262 | addNoRedraw(c);
|
---|
263 | afterAdd(c);
|
---|
264 | }
|
---|
265 |
|
---|
266 | /**
|
---|
267 | * Undoes the last added command.
|
---|
268 | */
|
---|
269 | public void undo() {
|
---|
270 | undo(1);
|
---|
271 | }
|
---|
272 |
|
---|
273 | /**
|
---|
274 | * Undoes multiple commands.
|
---|
275 | * @param num The number of commands to undo
|
---|
276 | */
|
---|
277 | public synchronized void undo(int num) {
|
---|
278 | if (commands.isEmpty())
|
---|
279 | return;
|
---|
280 | DataSet ds = Main.main.getEditDataSet();
|
---|
281 | if (ds != null) {
|
---|
282 | ds.beginUpdate();
|
---|
283 | }
|
---|
284 | try {
|
---|
285 | for (int i = 1; i <= num; ++i) {
|
---|
286 | final Command c = commands.removeLast();
|
---|
287 | c.undoCommand();
|
---|
288 | redoCommands.addFirst(c);
|
---|
289 | fireEvent(new CommandUndoneEvent(this, c));
|
---|
290 | if (commands.isEmpty()) {
|
---|
291 | break;
|
---|
292 | }
|
---|
293 | }
|
---|
294 | } finally {
|
---|
295 | if (ds != null) {
|
---|
296 | ds.endUpdate();
|
---|
297 | }
|
---|
298 | }
|
---|
299 | fireCommandsChanged();
|
---|
300 | }
|
---|
301 |
|
---|
302 | /**
|
---|
303 | * Redoes the last undoed command.
|
---|
304 | */
|
---|
305 | public void redo() {
|
---|
306 | redo(1);
|
---|
307 | }
|
---|
308 |
|
---|
309 | /**
|
---|
310 | * Redoes multiple commands.
|
---|
311 | * @param num The number of commands to redo
|
---|
312 | */
|
---|
313 | public void redo(int num) {
|
---|
314 | if (redoCommands.isEmpty())
|
---|
315 | return;
|
---|
316 | for (int i = 0; i < num; ++i) {
|
---|
317 | final Command c = redoCommands.removeFirst();
|
---|
318 | c.executeCommand();
|
---|
319 | commands.add(c);
|
---|
320 | fireEvent(new CommandRedoneEvent(this, c));
|
---|
321 | if (redoCommands.isEmpty()) {
|
---|
322 | break;
|
---|
323 | }
|
---|
324 | }
|
---|
325 | fireCommandsChanged();
|
---|
326 | }
|
---|
327 |
|
---|
328 | /**
|
---|
329 | * Fires a command change to all listeners.
|
---|
330 | */
|
---|
331 | private void fireCommandsChanged() {
|
---|
332 | for (final CommandQueueListener l : listenerCommands) {
|
---|
333 | l.commandChanged(commands.size(), redoCommands.size());
|
---|
334 | }
|
---|
335 | }
|
---|
336 |
|
---|
337 | private void fireEvent(CommandQueueEvent e) {
|
---|
338 | preciseListenerCommands.forEach(e::fire);
|
---|
339 | }
|
---|
340 |
|
---|
341 | /**
|
---|
342 | * Resets the undo/redo list.
|
---|
343 | */
|
---|
344 | public void clean() {
|
---|
345 | redoCommands.clear();
|
---|
346 | commands.clear();
|
---|
347 | fireEvent(new CommandQueueCleanedEvent(this, null));
|
---|
348 | fireCommandsChanged();
|
---|
349 | }
|
---|
350 |
|
---|
351 | /**
|
---|
352 | * Resets all commands that affect the given dataset.
|
---|
353 | * @param dataSet The data set that was affected.
|
---|
354 | * @since 12718
|
---|
355 | */
|
---|
356 | public void clean(DataSet dataSet) {
|
---|
357 | if (dataSet == null)
|
---|
358 | return;
|
---|
359 | boolean changed = false;
|
---|
360 | for (Iterator<Command> it = commands.iterator(); it.hasNext();) {
|
---|
361 | if (it.next().getAffectedDataSet() == dataSet) {
|
---|
362 | it.remove();
|
---|
363 | changed = true;
|
---|
364 | }
|
---|
365 | }
|
---|
366 | for (Iterator<Command> it = redoCommands.iterator(); it.hasNext();) {
|
---|
367 | if (it.next().getAffectedDataSet() == dataSet) {
|
---|
368 | it.remove();
|
---|
369 | changed = true;
|
---|
370 | }
|
---|
371 | }
|
---|
372 | if (changed) {
|
---|
373 | fireEvent(new CommandQueueCleanedEvent(this, dataSet));
|
---|
374 | fireCommandsChanged();
|
---|
375 | }
|
---|
376 | }
|
---|
377 |
|
---|
378 | /**
|
---|
379 | * Removes a command queue listener.
|
---|
380 | * @param l The command queue listener to remove
|
---|
381 | */
|
---|
382 | public void removeCommandQueueListener(CommandQueueListener l) {
|
---|
383 | listenerCommands.remove(l);
|
---|
384 | }
|
---|
385 |
|
---|
386 | /**
|
---|
387 | * Adds a command queue listener.
|
---|
388 | * @param l The command queue listener to add
|
---|
389 | * @return {@code true} if the listener has been added, {@code false} otherwise
|
---|
390 | */
|
---|
391 | public boolean addCommandQueueListener(CommandQueueListener l) {
|
---|
392 | return listenerCommands.add(l);
|
---|
393 | }
|
---|
394 |
|
---|
395 | /**
|
---|
396 | * Removes a precise command queue listener.
|
---|
397 | * @param l The precise command queue listener to remove
|
---|
398 | * @since 13729
|
---|
399 | */
|
---|
400 | public void removeCommandQueuePreciseListener(CommandQueuePreciseListener l) {
|
---|
401 | preciseListenerCommands.remove(l);
|
---|
402 | }
|
---|
403 |
|
---|
404 | /**
|
---|
405 | * Adds a precise command queue listener.
|
---|
406 | * @param l The precise command queue listener to add
|
---|
407 | * @return {@code true} if the listener has been added, {@code false} otherwise
|
---|
408 | * @since 13729
|
---|
409 | */
|
---|
410 | public boolean addCommandQueuePreciseListener(CommandQueuePreciseListener l) {
|
---|
411 | return preciseListenerCommands.add(l);
|
---|
412 | }
|
---|
413 | }
|
---|