core/src/main/java/dev/kske/undoredo/core/ChangeManager.java

@@ -6,6 +6,10 @@ import java.util.*;
  * A change manager keeps track of subsequent changes and allows un- and redoing them. A specific
  * change can be marked using {@link #mark()} to keep track of a saved state in the application that
  * uses the manager.
+ * <p>
+ * If you intend to listen to the state of a change manager, consider writing a wrapper
+ * implementation for an existing change manager that adds the necessary hooks. If you use JavaFX,
+ * take a look at the {@code dev.kske.undoredo.javafx} module.
  *
  * @param <C> the change type to store in this change manager
  * @author Maximilian K&auml;fer

core/src/main/java/dev/kske/undoredo/core/UnlimitedChangeManager.java

@@ -24,7 +24,7 @@ public final class UnlimitedChangeManager<C extends Change> implements ChangeMan
 
 	@Override
 	public Optional<C> getLastChange() {
-		return index == -1 ? Optional.empty() : Optional.of(changes.get(index));
+		return index < 0 ? Optional.empty() : Optional.of(changes.get(index));
 	}
 
 	@Override

core/src/test/java/dev/kske/undoredo/core/ChangeManagerTest.java

@@ -27,7 +27,7 @@ class ChangeManagerTest {
 	 * @since 0.0.1
 	 */
 	@Test
-	@Order(1)
+	@Order(10)
 	void testAddChange() {
 		assertSame(0, wrapper.value);
 		manager.addChange(change);
@@ -40,7 +40,7 @@ class ChangeManagerTest {
 	 * @since 0.0.1
 	 */
 	@Test
-	@Order(2)
+	@Order(20)
 	void testLastChange() {
 		assertTrue(manager.getLastChange().isEmpty());
 		manager.addChange(change);
@@ -53,7 +53,7 @@ class ChangeManagerTest {
 	 * @since 0.0.1
 	 */
 	@Test
-	@Order(3)
+	@Order(30)
 	void testGetChanges() {
 		assertTrue(manager.getChanges().isEmpty());
 		manager.addChange(change);
@@ -67,7 +67,7 @@ class ChangeManagerTest {
 	 * @since 0.0.1
 	 */
 	@Test
-	@Order(4)
+	@Order(40)
 	void testUndo() {
 		assertFalse(manager.isUndoAvailable());
 		assertFalse(manager.undo());
@@ -85,7 +85,7 @@ class ChangeManagerTest {
 	 * @since 0.0.1
 	 */
 	@Test
-	@Order(5)
+	@Order(50)
 	void testRedo() {
 		assertFalse(manager.isRedoAvailable());
 		assertFalse(manager.redo());
@@ -106,7 +106,7 @@ class ChangeManagerTest {
 	 * @since 0.0.1
 	 */
 	@Test
-	@Order(6)
+	@Order(60)
 	void testMark() {
 		assertTrue(manager.isAtMarkedIndex());
 		manager.addChange(change);

javafx/src/main/java/dev/kske/undoredo/javafx/ChangeManagerWrapper.java

@@ -9,6 +9,11 @@ import dev.kske.undoredo.core.*;
 /**
  * Wraps an ordinary change manager into an observable change manager, providing the required
  * properties for concrete implementations.
+ * <p>
+ * The properties have the same name as their corresponding {@code -property()} methods and can be
+ * accessed reflectively from JavaFX, e.g. through
+ * {@link javafx.beans.binding.Bindings#select(Object, String...)}. Alternatively, the property
+ * names are available as constants.
  *
  * @param <C> the change type to store in this change manager
  * @param <M> the type of change manager to wrap
@@ -18,18 +23,29 @@ import dev.kske.undoredo.core.*;
 public class ChangeManagerWrapper<C extends Change, M extends ChangeManager<C>>
 	implements ObservableChangeManager<C> {
 
+	public static final String	LAST_CHANGE		= "lastChange";
+	public static final String	AT_MARKED_INDEX	= "atMarkedIndex";
+	public static final String	UNDO_AVAILABLE	= "undoAvailable";
+	public static final String	REDO_AVAILABLE	= "redoAvailable";
+
 	protected ReadOnlyObjectWrapper<C>	lastChange		=
-		new ReadOnlyObjectWrapper<>(this, "lastChange");
+		new ReadOnlyObjectWrapper<>(this, LAST_CHANGE);
 	protected ReadOnlyBooleanWrapper	atMarkedIndex	=
-		new ReadOnlyBooleanWrapper(this, "atMarkedIndex");
+		new ReadOnlyBooleanWrapper(this, AT_MARKED_INDEX);
 	protected ReadOnlyBooleanWrapper	undoAvailable	=
-		new ReadOnlyBooleanWrapper(this, "undoAvailable");
+		new ReadOnlyBooleanWrapper(this, UNDO_AVAILABLE);
 	protected ReadOnlyBooleanWrapper	redoAvailable	=
-		new ReadOnlyBooleanWrapper(this, "redoAvailable");
+		new ReadOnlyBooleanWrapper(this, REDO_AVAILABLE);
 
 	protected final M manager;
 
-	protected ChangeManagerWrapper(M manager) {
+	/**
+	 * Initializes a change manager wrapper.
+	 *
+	 * @param manager the change manager to wrap
+	 * @since 0.0.1
+	 */
+	public ChangeManagerWrapper(M manager) {
 		this.manager = manager;
 	}
 

javafx/src/main/java/dev/kske/undoredo/javafx/ObservableChangeManager.java

@@ -7,9 +7,13 @@ import javafx.beans.property.*;
 import dev.kske.undoredo.core.*;
 
 /**
+ * A change manager that exposes its state through JavaFX properties, thereby allowing a direct
+ * integration of Undo-Redo with JavaFX listeners and property bindings.
+ *
  * @param <C> the change type to store in this change manager
  * @author Kai S. K. Engelbart
  * @since 0.0.1
+ * @see ChangeManagerWrapper
  */
 public interface ObservableChangeManager<C extends Change> extends ChangeManager<C> {
 

javafx/src/main/java/module-info.java

@@ -8,6 +8,8 @@ module dev.kske.undoredo.javafx {
 
 	exports dev.kske.undoredo.javafx;
 
-	requires dev.kske.undoredo.core;
+	opens dev.kske.undoredo.javafx to javafx.base;
+
+	requires transitive dev.kske.undoredo.core;
 	requires transitive javafx.base;
 }

pom.xml

@@ -48,6 +48,16 @@
 			</roles>
 			<timezone>Europe/Berlin</timezone>
 		</developer>
+		<developer>
+			<name>Leon Hofmeister</name>
+			<email>leon@kske.dev</email>
+			<url>https://git.kske.dev/delvh</url>
+			<roles>
+				<role>architect</role>
+				<role>developer</role>
+			</roles>
+			<timezone>Europe/Berlin</timezone>
+		</developer>
 	</developers>
 
 	<scm>