tests/org.eclipse.ui.tests/Eclipse UI Tests/org/eclipse/ui/tests/decorators/TestLightweightDecoratorMultipleQuadrantContributor.java

/*******************************************************************************
 * Copyright (c) 2004, 2017 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.tests.decorators;

import java.net.URL;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.IDecoration;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.ILightweightLabelDecorator;
import org.eclipse.jface.viewers.LabelProviderChangedEvent;
import org.osgi.framework.Bundle;
import org.osgi.framework.FrameworkUtil;

/**
 * This is a contributor that uses the multi quadrant
 * support.
 */

public class TestLightweightDecoratorMultipleQuadrantContributor implements
        ILightweightLabelDecorator {

	private Set<ILabelProviderListener> listeners = new HashSet<>();

    private ImageDescriptor descriptor;

    public TestLightweightDecoratorMultipleQuadrantContributor() {
    }

    @Override
	public void addListener(ILabelProviderListener listener) {
        listeners.add(listener);
    }

    @Override
	public void dispose() {
		listeners = new HashSet<>();
    }

    @Override
	public boolean isLabelProperty(Object element, String property) {
        return false;
    }

    @Override
	public void removeListener(ILabelProviderListener listener) {
        listeners.remove(listener);
    }

    /**
     * Refresh the listeners to update the decorators for
     * element.
     */

    public void refreshListeners(Object element) {
		Iterator<ILabelProviderListener> iterator = listeners.iterator();
        while (iterator.hasNext()) {
            LabelProviderChangedEvent event = new LabelProviderChangedEvent(
                    this, element);
            iterator.next()
                    .labelProviderChanged(event);
        }
    }

    public ImageDescriptor getOverlay(Object element) {
        Assert.isTrue(element instanceof IResource);
        if (descriptor == null) {
			Bundle bundle = FrameworkUtil.getBundle(BadIndexDecorator.class);
			URL entry = bundle.getEntry("icons/binary_co.gif");
			descriptor = ImageDescriptor.createFromURL(entry);
        }
        return descriptor;

    }

    @Override
	public void decorate(Object element, IDecoration decoration) {
        decoration.addOverlay(getOverlay(element), IDecoration.BOTTOM_LEFT);
        decoration.addOverlay(getOverlay(element), IDecoration.BOTTOM_RIGHT);
        decoration.addOverlay(getOverlay(element), IDecoration.TOP_LEFT);
        decoration.addOverlay(getOverlay(element), IDecoration.TOP_RIGHT);
        decoration.addOverlay(getOverlay(element), IDecoration.UNDERLAY);
    }

}