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/**
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* Copyright (C) 2007 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.taxeditor.editor;
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import java.util.HashSet;
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import java.util.Set;
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import org.eclipse.core.runtime.IProgressMonitor;
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import org.eclipse.core.runtime.IStatus;
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import org.eclipse.core.runtime.Status;
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import org.eclipse.core.runtime.jobs.Job;
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import org.eclipse.jface.util.SafeRunnable;
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import org.eclipse.jface.viewers.ISelection;
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import org.eclipse.jface.viewers.ISelectionChangedListener;
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import org.eclipse.jface.viewers.ISelectionProvider;
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import org.eclipse.jface.viewers.SelectionChangedEvent;
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import org.eclipse.jface.viewers.StructuredSelection;
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import org.eclipse.swt.widgets.Display;
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import eu.etaxonomy.taxeditor.editor.l10n.Messages;
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/**
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* <p>SimpleSelectionProvider class.</p>
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*
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* @author p.ciardelli
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* @author n.hoffmann
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* @created 16.05.2008
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*/
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public class SimpleSelectionProvider implements ISelectionProvider {
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private static final String SETTING_SELECTION = Messages.SimpleSelectionProvider_SETTING_SELECTION;
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private Set<ISelectionChangedListener> selectionChangedListeners = new HashSet<ISelectionChangedListener>();
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private ISelection selection;
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private Job job;
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@Override
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public void addSelectionChangedListener(
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ISelectionChangedListener listener) {
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selectionChangedListeners.add(listener);
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}
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/**
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* <p>Getter for the field <code>selection</code>.</p>
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*
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* @return a {@link org.eclipse.jface.viewers.ISelection} object.
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*/
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@Override
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public ISelection getSelection() {
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if (selection != null){
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return selection;
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}
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// TODO we have to return an empty selection to avoid NPE
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// I don't really understand why this was not the case before
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return new StructuredSelection();
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}
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@Override
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public void removeSelectionChangedListener(
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ISelectionChangedListener listener) {
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selectionChangedListeners.remove(listener);
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}
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@Override
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public void setSelection(ISelection selection) {
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this.selection = selection;
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// cancel previous selection setting
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if(job != null){
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if(job.getState() != Job.NONE){
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job.cancel();
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}
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job = null;
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}
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if(job == null){
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final SelectionChangedEvent selectionChangedEvent = new SelectionChangedEvent(this, selection);
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final Display display = Display.getCurrent();
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job = new Job(SETTING_SELECTION){
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@Override
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protected IStatus run(IProgressMonitor monitor) {
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monitor.beginTask(SETTING_SELECTION, 10);
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if(!monitor.isCanceled()){
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display.asyncExec(new Runnable() {
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@Override
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public void run() {
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SimpleSelectionProvider.this.fireSelectionChanged(selectionChangedEvent);
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}
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});
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}
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return Status.OK_STATUS;
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}
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};
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job.setPriority(Job.DECORATE);
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job.schedule();
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}
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}
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private void fireSelectionChanged(final SelectionChangedEvent event) {
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for (final ISelectionChangedListener listener : selectionChangedListeners) {
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SafeRunnable.run(new SafeRunnable() {
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@Override
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public void run() {
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listener.selectionChanged(event);
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}
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});
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}
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}
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}
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