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/*******************************************************************************
* Copyright (c) 2005, 2006 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.debug.internal.ui.viewers;
import org.eclipse.core.runtime.ListenerList;
import org.eclipse.core.runtime.SafeRunner;
import org.eclipse.debug.internal.ui.viewers.provisional.IPresentationContext;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.jface.util.SafeRunnable;
import org.eclipse.ui.IWorkbenchPart;
/**
* Presentation context.
* <p>
* Clients may instantiate and subclass this class.
* </p>
* @since 3.2
*/
public class PresentationContext implements IPresentationContext {
private IWorkbenchPart fPart;
private String fId;
private String[] fColumns;
private ListenerList fListeners = new ListenerList();
/**
* Constructs a presentation context for the given part.
*
* @param part workbench part
*/
public PresentationContext(IWorkbenchPart part) {
fPart = part;
if (part != null) {
fId = part.getSite().getId();
}
}
/**
* Constructs a presentation context for the given id.
*
* @param id presentation context id
*/
public PresentationContext(String id) {
fId = id;
}
/* (non-Javadoc)
* @see org.eclipse.debug.ui.viewers.IPresentationContext#getPart()
*/
public IWorkbenchPart getPart() {
return fPart;
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.provisional.IPresentationContext#getColumns()
*/
public String[] getColumns() {
return fColumns;
}
/**
* Fires a property change event to all registered listeners
*
* @param property property name
* @param oldValue old value or <code>null</code>
* @param newValue new value or <code>null</code>
*/
protected void firePropertyChange(String property, Object oldValue, Object newValue) {
if (!fListeners.isEmpty()) {
final PropertyChangeEvent event = new PropertyChangeEvent(this, property, oldValue, newValue);
Object[] listeners = fListeners.getListeners();
for (int i = 0; i < listeners.length; i++) {
final IPropertyChangeListener listener = (IPropertyChangeListener) listeners[i];
SafeRunner.run(new SafeRunnable() {
public void run() throws Exception {
listener.propertyChange(event);
}
});
}
}
}
/**
* Sets the visible column ids.
*
* @param ids column identifiers
*/
protected void setColumns(String[] ids) {
String[] oldValue = fColumns;
fColumns = ids;
firePropertyChange(IPresentationContext.PROPERTY_COLUMNS, oldValue, ids);
}
/**
* Disposes this presentation context.
*/
protected void dispose() {
fListeners.clear();
fPart = null;
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.provisional.IPresentationContext#addPropertyChangeListener(org.eclipse.jface.util.IPropertyChangeListener)
*/
public void addPropertyChangeListener(IPropertyChangeListener listener) {
fListeners.add(listener);
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.provisional.IPresentationContext#removePropertyChangeListener(org.eclipse.jface.util.IPropertyChangeListener)
*/
public void removePropertyChangeListener(IPropertyChangeListener listener) {
fListeners.remove(listener);
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.provisional.IPresentationContext#getId()
*/
public String getId() {
return fId;
}
}
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