Add ObservableChangeManager interface with wrapper implementation

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

@@ -26,7 +26,7 @@ public interface ChangeManager<C extends Change> {
 	 * @return the change that was applied last
 	 * @since 0.0.1
 	 */
-	Optional<Change> getLastChange();
+	Optional<C> getLastChange();
 
 	/**
 	 * Undoes the current change.

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

@@ -23,7 +23,7 @@ public final class UnlimitedChangeManager<C extends Change> implements ChangeMan
 	}
 
 	@Override
-	public Optional<Change> getLastChange() {
+	public Optional<C> getLastChange() {
 		return index == -1 ? Optional.empty() : Optional.of(changes.get(index));
 	}
 

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

@@ -0,0 +1,118 @@
+package dev.kske.undoredo.javafx;
+
+import java.util.List;
+
+import javafx.beans.property.*;
+
+import dev.kske.undoredo.core.*;
+
+/**
+ * Wraps an ordinary change manager into an observable change manager, providing the required
+ * properties for concrete implementations.
+ *
+ * @param <C> the change type to store in this change manager
+ * @param <M> the type of change manager to wrap
+ * @author Kai S. K. Engelbart
+ * @since 0.0.1
+ */
+public class ChangeManagerWrapper<C extends Change, M extends ChangeManager<C>>
+	implements ObservableChangeManager<C> {
+
+	protected ReadOnlyObjectWrapper<C>	lastChange		=
+		new ReadOnlyObjectWrapper<>(this, "lastChange");
+	protected ReadOnlyBooleanWrapper	atMarkedIndex	=
+		new ReadOnlyBooleanWrapper(this, "atMarkedIndex");
+	protected ReadOnlyBooleanWrapper	undoAvailable	=
+		new ReadOnlyBooleanWrapper(this, "undoAvailable");
+	protected ReadOnlyBooleanWrapper	redoAvailable	=
+		new ReadOnlyBooleanWrapper(this, "redoAvailable");
+
+	protected final M manager;
+
+	protected ChangeManagerWrapper(M manager) {
+		this.manager = manager;
+	}
+
+	@Override
+	public void addChange(C change) {
+		manager.addChange(change);
+		updateProperties();
+	}
+
+	@Override
+	public boolean undo() {
+		if (manager.undo()) {
+			updateProperties();
+			return true;
+		}
+		return false;
+	}
+
+	@Override
+	public boolean redo() {
+		if (manager.redo()) {
+			updateProperties();
+			return true;
+		}
+		return false;
+	}
+
+	@Override
+	public void mark() {
+		manager.mark();
+		setAtMarkedIndex(manager.isAtMarkedIndex());
+	}
+
+	/**
+	 * Sets the values of all properties to those present in the wrapped change manager.
+	 *
+	 * @since 0.0.1
+	 */
+	private void updateProperties() {
+		setLastChange(manager.getLastChange().orElse(null));
+		setAtMarkedIndex(manager.isAtMarkedIndex());
+		setUndoAvailable(manager.isUndoAvailable());
+		setRedoAvailable(manager.isRedoAvailable());
+	}
+
+	@Override
+	public final ReadOnlyObjectProperty<C> lastChangeProperty() {
+		return lastChange.getReadOnlyProperty();
+	}
+
+	protected final void setLastChange(C lastChange) {
+		this.lastChange.set(lastChange);
+	}
+
+	@Override
+	public final ReadOnlyBooleanProperty atMarkedIndexProperty() {
+		return atMarkedIndex.getReadOnlyProperty();
+	}
+
+	protected final void setAtMarkedIndex(boolean atMarkedIndex) {
+		this.atMarkedIndex.set(atMarkedIndex);
+	}
+
+	@Override
+	public final ReadOnlyBooleanProperty undoAvailableProperty() {
+		return undoAvailable.getReadOnlyProperty();
+	}
+
+	protected final void setUndoAvailable(boolean undoAvailable) {
+		this.undoAvailable.set(undoAvailable);
+	}
+
+	@Override
+	public final ReadOnlyBooleanProperty redoAvailableProperty() {
+		return redoAvailable.getReadOnlyProperty();
+	}
+
+	protected final void setRedoAvailable(boolean redoAvailable) {
+		this.redoAvailable.set(redoAvailable);
+	}
+
+	@Override
+	public List<C> getChanges() {
+		return manager.getChanges();
+	}
+}

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

@@ -0,0 +1,43 @@
+package dev.kske.undoredo.javafx;
+
+import java.util.Optional;
+
+import javafx.beans.property.*;
+
+import dev.kske.undoredo.core.*;
+
+/**
+ * @param <C> the change type to store in this change manager
+ * @author Kai S. K. Engelbart
+ * @since 0.0.1
+ */
+public interface ObservableChangeManager<C extends Change> extends ChangeManager<C> {
+
+	ReadOnlyObjectProperty<C> lastChangeProperty();
+	
+	@Override
+	default Optional<C> getLastChange() {
+		return Optional.of(lastChangeProperty().get());
+	}
+	
+	ReadOnlyBooleanProperty atMarkedIndexProperty();
+	
+	@Override
+	default boolean isAtMarkedIndex() {
+		return atMarkedIndexProperty().get();
+	}
+	
+	ReadOnlyBooleanProperty undoAvailableProperty();
+	
+	@Override
+	default boolean isUndoAvailable() {
+		return undoAvailableProperty().get();
+	}
+	
+	ReadOnlyBooleanProperty redoAvailableProperty();
+	
+	@Override
+	default boolean isRedoAvailable() {
+		return redoAvailableProperty().get();
+	}
+}

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

@@ -9,5 +9,5 @@ module dev.kske.undoredo.javafx {
 	exports dev.kske.undoredo.javafx;
 
 	requires dev.kske.undoredo.core;
-	requires javafx.base;
+	requires transitive javafx.base;
 }