/*
* uDig - User Friendly Desktop Internet GIS client
* http://udig.refractions.net
* (C) 2004, Refractions Research Inc.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* (http://www.eclipse.org/legal/epl-v10.html), and the Refractions BSD
* License v1.0 (http://udig.refractions.net/files/bsd3-v10.html).
*
*/
package org.locationtech.udig.project.ui.internal;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;
import org.locationtech.udig.project.internal.Layer;
import org.eclipse.emf.common.notify.Adapter;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.notify.impl.AdapterImpl;
import org.eclipse.jface.viewers.IDecoration;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.ILightweightLabelDecorator;
import org.eclipse.jface.viewers.LabelProviderChangedEvent;
/**
* Listen to state changes such as isDirty.
* <p>
* This would be better handled as a series of lightweight decorators if such things can be aranged.
* </p>
*
* @author jgarnett
* @since 0.7.0
*/
public class LayerStateDecorator implements ILightweightLabelDecorator {
private Adapter adapterImpl = new AdapterImpl(){
public void notifyChanged( Notification msg ) {
if (msg.getNotifier() instanceof Layer) {
Layer layer = (Layer) msg.getNotifier();
refresh(layer); // just refresh for now
}
}
};
Set<ILabelProviderListener> listeners = new CopyOnWriteArraySet<ILabelProviderListener>();
void refresh( Layer layer ) {
if (listeners.isEmpty())
return;
LabelProviderChangedEvent event = new LabelProviderChangedEvent(this, layer);
for( ILabelProviderListener listener : listeners ) {
listener.labelProviderChanged(event);
}
}
void refresh() {
if (listeners.isEmpty())
return;
LabelProviderChangedEvent event = new LabelProviderChangedEvent(this);
for( ILabelProviderListener listener : listeners ) {
listener.labelProviderChanged(event);
}
}
/**
* @see org.eclipse.jface.viewers.ILightweightLabelDecorator#decorate(java.lang.Object,
* org.eclipse.jface.viewers.IDecoration)
*/
@SuppressWarnings("unchecked")
public void decorate( Object element, IDecoration decoration ) {
Layer layer = (Layer) element; // should be safe, extention point does the instanceof
// check
decoration.addOverlay(ProjectUIPlugin.getDefault().getImageDescriptor(ISharedImages.WRITE_OVR));
if (!layer.eAdapters().contains(adapterImpl)) {
layer.eAdapters().add(adapterImpl);
}
}
/**
* @see org.eclipse.jface.viewers.IBaseLabelProvider#addListener(org.eclipse.jface.viewers.ILabelProviderListener)
*/
public void addListener( ILabelProviderListener listener ) {
listeners.add(listener);
}
/**
* @see org.eclipse.jface.viewers.IBaseLabelProvider#dispose()
*/
public void dispose() {
// clean up
listeners.clear();
}
/**
* @see org.eclipse.jface.viewers.IBaseLabelProvider#isLabelProperty(java.lang.Object,
* java.lang.String)
*/
public boolean isLabelProperty( Object element, String property ) {
return true; // "state".equals( property );
}
/**
* @see org.eclipse.jface.viewers.IBaseLabelProvider#removeListener(org.eclipse.jface.viewers.ILabelProviderListener)
*/
public void removeListener( ILabelProviderListener listener ) {
listeners.remove(listener);
}
}