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/**
*
*/
package org.eclipse.papyrus.infra.core.sasheditor.di.contentprovider.internal;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.ecore.util.EContentAdapter;
import org.eclipse.papyrus.infra.core.sasheditor.contentprovider.IContentChangedListener;
import org.eclipse.papyrus.infra.core.sasheditor.contentprovider.IContentChangedProvider;
import org.eclipse.papyrus.infra.core.sasheditor.contentprovider.IContentChangedListener.ContentEvent;
import org.eclipse.papyrus.infra.core.sashwindows.di.AbstractPanel;
import org.eclipse.papyrus.infra.core.sashwindows.di.PageRef;
import org.eclipse.papyrus.infra.core.sashwindows.di.SashModel;
import org.eclipse.papyrus.infra.core.sashwindows.di.SashWindowsMngr;
import org.eclipse.papyrus.infra.core.sashwindows.di.Window;
/**
* A class listening on changes on the internal model and delivering events to registered listeners.
*
* @author cedric dumoulin
*
*/
public class ContentChangedEventProvider implements IContentChangedProvider {
private List<IContentChangedListener> listeners;
/** Is this mngr delivering events ? */
private boolean isDeliverEnable = true;
/** Last event stored when isDeliverEnable == false; */
private ContentEvent storedEvent;
private EMFAdapter emfAdapter = new EMFAdapter();
/**
* The model firing events
*/
private SashModel diSashModel;
/**
*
* Constructor.
*
* @param diSashModel
*/
public ContentChangedEventProvider(SashModel diSashModel) {
this.diSashModel = diSashModel;
activate();
}
/**
*
* Constructor.
*
* @param diSashModel
*/
public ContentChangedEventProvider(SashWindowsMngr sashWindowMngr) {
this(sashWindowMngr.getSashModel());
}
/**
* Connect EMF changeListener to the {@link ContentChangeListenerManager}.
* Changes in the EMF di model will be fired by the ContentChangeListenerManager.
*/
protected void activate() {
diSashModel.eAdapters().add(emfAdapter);
setDeliver(true);
}
protected void deactivate() {
setDeliver(false);
diSashModel.eAdapters().remove(emfAdapter);
}
/**
* @return the isDeliverEnable
*/
protected boolean isDeliver() {
return isDeliverEnable;
}
/**
* @param isDeliverEnable
* the isDeliverEnable to set
*/
protected void setDeliver(boolean isDeliverEnable) {
if(this.isDeliverEnable == isDeliverEnable)
return;
// Check if the old value is not delivering event
if(!this.isDeliverEnable) {
this.isDeliverEnable = true;
// reenable events. Check if an event is stored
if(storedEvent != null)
fireContentChanged(storedEvent);
} else
this.isDeliverEnable = isDeliverEnable;
storedEvent = null;
}
/**
* Add a listener listening on content changed. This listener will be
* notified each time the content change.
*
* @param listener
*/
public void addListener(IContentChangedListener listener) {
if(listeners == null)
createListeners();
// Check if already exists.
if(listeners.contains(listener))
return;
listeners.add(listener);
}
/**
* Add a listener listening on content changed. This listener will be
* notified each time the content change.
*
* @param listener
*/
public void removeListener(IContentChangedListener listener) {
if(listeners == null)
return;
listeners.remove(listener);
}
/**
* Create the list of listeners.
*/
private void createListeners() {
if(listeners == null)
listeners = new ArrayList<IContentChangedListener>();
}
/**
* Fire the changed event.
*
* @param event
*/
protected void fireContentChanged(ContentEvent event) {
if(listeners == null)
return;
if(!isDeliverEnable) {
storedEvent = event;
return;
}
for(IContentChangedListener listener : listeners) {
listener.contentChanged(event);
}
}
/**
* Change event Adapter.
* Forward EMF changeEvent to the {@link ContentChangeListenerManager}.
*
* @author cedric dumoulin
*/
public class EMFAdapter extends EContentAdapter {
/**
* ContentProvider Model has changed.
* Changes includes : ADD, REMOVE and MOVE of elements
*
* @see org.eclipse.emf.common.notify.impl.AdapterImpl#notifyChanged(org.eclipse.emf.common.notify.Notification)
*
* @param msg
*/
@Override
public void notifyChanged(Notification msg) {
super.notifyChanged(msg);
// Filter out notification of type RESOLVE
// We don't need to be noti
if(msg.getEventType() == Notification.RESOLVE)
return;
// W
Object sender = msg.getNotifier();
if(sender instanceof AbstractPanel || sender instanceof Window || sender instanceof PageRef)
fireContentChanged(new ContentEvent(msg.getEventType(), sender, null));
}
}
}
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