org.jgrapht.alg.drawing.model.ListenableLayoutModel2D Maven / Gradle / Ivy
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/*
* (C) Copyright 2018-2023, by Dimitrios Michail and Contributors.
*
* JGraphT : a free Java graph-theory library
*
* See the CONTRIBUTORS.md file distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0, or the
* GNU Lesser General Public License v2.1 or later
* which is available at
* http://www.gnu.org/licenses/old-licenses/lgpl-2.1-standalone.html.
*
* SPDX-License-Identifier: EPL-2.0 OR LGPL-2.1-or-later
*/
package org.jgrapht.alg.drawing.model;
import java.util.*;
import java.util.Map.*;
import java.util.function.*;
/**
* A layout model wrapper which adds support for listeners.
*
* @author Dimitrios Michail
*
* @param the vertex type
*/
public class ListenableLayoutModel2D
implements LayoutModel2D
{
protected LayoutModel2D model;
protected List> listeners;
/**
* Create a new model
*
* @param model the underlying layout model
*/
public ListenableLayoutModel2D(LayoutModel2D model)
{
this.model = Objects.requireNonNull(model);
this.listeners = new ArrayList<>();
}
@Override
public Box2D getDrawableArea()
{
return model.getDrawableArea();
}
@Override
public void setDrawableArea(Box2D drawableArea)
{
model.setDrawableArea(drawableArea);
}
@Override
public Iterator> iterator()
{
return model.iterator();
}
@Override
public Point2D get(V vertex)
{
return model.get(vertex);
}
@Override
public Point2D put(V vertex, Point2D point)
{
if (!model.isFixed(vertex)) {
Point2D oldValue = model.put(vertex, point);
notifyListeners(vertex, point);
return oldValue;
} else {
return model.get(vertex);
}
}
@Override
public void setFixed(V vertex, boolean fixed)
{
model.setFixed(vertex, fixed);
}
@Override
public boolean isFixed(V vertex)
{
return model.isFixed(vertex);
}
/**
* Add a new listener.
*
* @param listener the listener to add
* @return the newly added listener
*/
public BiConsumer addListener(BiConsumer listener)
{
listeners.add(listener);
return listener;
}
/**
* Remove a listener.
*
* @param listener the listener to remove
* @return true if the listener was removed, false otherwise
*/
public boolean removeListener(BiConsumer listener)
{
return listeners.remove(listener);
}
/**
* Notify all registered listeners.
*
* @param vertex the vertex
* @param point the vertex location
*/
protected void notifyListeners(V vertex, Point2D point)
{
for (BiConsumer listener : listeners) {
listener.accept(vertex, point);
}
}
}