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/*******************************************************************************
* Copyright (c) 2011, 2013 Wind River Systems, Inc. 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:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf.te.ui.views.editor;
import java.util.EventObject;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.tcf.te.runtime.events.ChangeEvent;
import org.eclipse.tcf.te.runtime.events.EventManager;
import org.eclipse.tcf.te.runtime.interfaces.IDisposable;
import org.eclipse.tcf.te.runtime.interfaces.properties.IPropertiesContainer;
import org.eclipse.tcf.te.ui.events.AbstractEventListener;
import org.eclipse.tcf.te.ui.views.activator.UIPlugin;
import org.eclipse.tcf.te.ui.views.interfaces.tracing.ITraceIds;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IPropertyListener;
import org.eclipse.ui.ISources;
import org.eclipse.ui.forms.editor.IFormPage;
import org.eclipse.ui.services.IEvaluationService;
/**
* Editor event listener implementation.
* <p>
* The event listener is registered by an editor instance for a given editor input
* and is supposed to receive events for the editor input only.
*/
public final class EditorEventListener extends AbstractEventListener implements IDisposable, IPropertyListener {
// Reference to the parent editor
private final Editor editor;
// Flag to remember the disposed state
private boolean disposed = false;
/**
* Constructor.
*
* @param editor The parent editor. Must not be <code>null</code>.
*/
public EditorEventListener(Editor editor) {
super();
Assert.isNotNull(editor);
this.editor = editor;
// Register the event listener if the editor input is a properties container
Object node = editor.getEditorInput() != null ? editor.getEditorInput().getAdapter(Object.class) : null;
if (node instanceof IPropertiesContainer) EventManager.getInstance().addEventListener(this, ChangeEvent.class, node);
editor.addPropertyListener(this);
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.interfaces.IDisposable#dispose()
*/
@Override
public void dispose() {
disposed = true;
EventManager.getInstance().removeEventListener(this);
editor.removePropertyListener(this);
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.interfaces.events.IEventListener#eventFired(java.util.EventObject)
*/
@Override
public void eventFired(EventObject event) {
// Do nothing if already disposed
if (disposed) return;
// Ignore everything not being a change event
if (!(event instanceof ChangeEvent)) return;
ChangeEvent changeEvent = (ChangeEvent)event;
if (UIPlugin.getTraceHandler().isSlotEnabled(0, ITraceIds.TRACE_EDITOR_EVENT_LISTENER)) {
UIPlugin.getTraceHandler().trace("Entered eventFired(...). eventId='" + changeEvent.getEventId() + "'" //$NON-NLS-1$ //$NON-NLS-2$
+ ", oldValue='" + changeEvent.getOldValue() + "'" //$NON-NLS-1$ //$NON-NLS-2$
+ ", newValue='" + changeEvent.getNewValue() + "'", //$NON-NLS-1$ //$NON-NLS-2$
0, ITraceIds.TRACE_EDITOR_EVENT_LISTENER,
IStatus.INFO, this);
}
// Get the event source
Object source = event.getSource();
// Double check with the parent editors input object
Object node = editor.getEditorInput() != null ? editor.getEditorInput().getAdapter(Object.class) : null;
// If the editor input cannot be determined or it does not match the event source
// --> return immediately
if (node == null || !node.equals(source)) {
if (UIPlugin.getTraceHandler().isSlotEnabled(0, ITraceIds.TRACE_EDITOR_EVENT_LISTENER)) {
UIPlugin.getTraceHandler().trace("Dropping out of eventFired(...). Event source does not match editor input.", //$NON-NLS-1$
0, ITraceIds.TRACE_EDITOR_EVENT_LISTENER,
IStatus.WARNING, this);
}
return;
}
// Refresh the page list. Changing editor input element properties
// may effect the page list -> Update in any case.
editor.updatePageList();
// If the event is a "editor.refreshTab" event, skip the rest
if (!"editor.refreshTab".equals(changeEvent.getEventId())) { //$NON-NLS-1$
// Update the active page content by calling IFormPage#setActive(boolean)
Object page = editor.getSelectedPage();
if (page instanceof IFormPage) {
((IFormPage)page).setActive(((IFormPage)page).isActive());
}
// Update the editor part name
editor.updatePartName();
// Request a re-evaluation if all expressions referring the "activeEditorInput" source.
IEvaluationService service = (IEvaluationService)editor.getSite().getService(IEvaluationService.class);
if (service != null) {
service.requestEvaluation(ISources.ACTIVE_EDITOR_INPUT_NAME);
}
}
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPropertyListener#propertyChanged(java.lang.Object, int)
*/
@Override
public void propertyChanged(Object source, int propId) {
if (source == this.editor) {
if (IEditorPart.PROP_DIRTY == propId) {
// Request a re-evaluation if all expressions referring the "activeEditorInput" source.
IEvaluationService service = (IEvaluationService)editor.getSite().getService(IEvaluationService.class);
if (service != null) {
service.requestEvaluation(ISources.ACTIVE_EDITOR_INPUT_NAME);
}
}
}
}
}
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