bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/internal/IPerspectiveService.java

package org.eclipse.ui.internal;

/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved.
 */
 
import org.eclipse.ui.*;

/**
 * A perspective service tracks the activation and reset of perspectives within a
 * workbench page.
 * <p>
 * This interface is not intended to be implemented by clients.
 * </p>
 *
 * @see IWorkbenchPage
 */
public interface IPerspectiveService {
/**
 * Adds the given listener for a page's perspective lifecycle events.
 * Has no effect if an identical listener is already registered.
 *
 * @param listener a perspective listener
 */
public void addPerspectiveListener(IInternalPerspectiveListener listener);
/*
 * Returns the active perspective descriptor in the active workbench page.
 *
 * @return the active perspective descriptor, or <code>null</code> if no perspective is currently active
 */
public IPerspectiveDescriptor getActivePerspective();
/**
 * Removes the given page's perspective listener.
 * Has no affect if an identical listener is not registered.
 *
 * @param listener a perspective listener
 */
public void removePerspectiveListener(IInternalPerspectiveListener listener);
}