/*******************************************************************************
* Copyright (c) 2000, 2008 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.ui;
import org.eclipse.jface.viewers.ISelection;
/**
* A selection service tracks the selection within an object.
* <p>
* A listener that wants to be notified when the selection becomes
* <code>null</code> must implement the <code>INullSelectionListener</code>
* interface.
* </p>
* <p>
* This service can be acquired from your service locator:
* <pre>
* ISelectionService service = (ISelectionService) getSite().getService(ISelectionService.class);
* </pre>
* <ul>
* <li>This service is not available globally, only from the workbench window level down.</li>
* </ul>
* </p>
*
* @see org.eclipse.ui.ISelectionListener
* @see org.eclipse.ui.INullSelectionListener
* @see org.eclipse.ui.services.IServiceLocator#getService(Class)
* @noimplement This interface is not intended to be implemented by clients.
*/
public interface ISelectionService {
/**
* Adds the given selection listener.
* Has no effect if an identical listener is already registered.
* <p>
* <b>Note:</b> listeners should be removed when no longer necessary. If
* not, they will be removed when the IServiceLocator used to acquire this
* service is disposed.
* </p>
*
* @param listener a selection listener
* @see #removeSelectionListener(ISelectionListener)
*/
public void addSelectionListener(ISelectionListener listener);
/**
* Adds a part-specific selection listener which is notified when selection changes
* in the part with the given id. This is independent of part activation - the part
* need not be active for notification to be sent.
* <p>
* When the part is created, the listener is passed the part's initial selection.
* When the part is disposed, the listener is passed a <code>null</code> selection,
* but only if the listener implements <code>INullSelectionListener</code>.
* </p>
* <p>
* Note: This will not correctly track editor parts as each editor does
* not have a unique partId.
* </p>
* <p>
* <b>Note:</b> listeners should be removed when no longer necessary. If
* not, they will be removed when the IServiceLocator used to acquire this
* service is disposed.
* </p>
*
* @param partId the id of the part to track
* @param listener a selection listener
* @since 2.0
* @see #removeSelectionListener(String, ISelectionListener)
*/
public void addSelectionListener(String partId, ISelectionListener listener);
/**
* Adds the given post selection listener.It is equivalent to selection
* changed if the selection was triggered by the mouse but it has a
* delay if the selection is triggered by the keyboard arrows.
* Has no effect if an identical listener is already registered.
*
* Note: Works only for StructuredViewer(s).
* <p>
* <b>Note:</b> listeners should be removed when no longer necessary. If
* not, they will be removed when the IServiceLocator used to acquire this
* service is disposed.
* </p>
*
* @param listener a selection listener
* @see #removePostSelectionListener(ISelectionListener)
*/
public void addPostSelectionListener(ISelectionListener listener);
/**
* Adds a part-specific selection listener which is notified when selection changes
* in the part with the given id. This is independent of part activation - the part
* need not be active for notification to be sent.
* <p>
* When the part is created, the listener is passed the part's initial selection.
* When the part is disposed, the listener is passed a <code>null</code> selection,
* but only if the listener implements <code>INullSelectionListener</code>.
* </p>
* <p>
* Note: This will not correctly track editor parts as each editor does
* not have a unique partId.
* </p>
* <p>
* <b>Note:</b> listeners should be removed when no longer necessary. If
* not, they will be removed when the IServiceLocator used to acquire this
* service is disposed.
* </p>
*
* @param partId the id of the part to track
* @param listener a selection listener
* @since 2.0
* @see #removePostSelectionListener(String, ISelectionListener)
*/
public void addPostSelectionListener(String partId,
ISelectionListener listener);
/**
* Returns the current selection in the active part. If the selection in the
* active part is <em>undefined</em> (the active part has no selection provider)
* the result will be <code>null</code>.
*
* @return the current selection, or <code>null</code> if undefined
*/
public ISelection getSelection();
/**
* Returns the current selection in the part with the given id. If the part is not open,
* or if the selection in the active part is <em>undefined</em> (the active part has no selection provider)
* the result will be <code>null</code>.
*
* @param partId the id of the part
* @return the current selection, or <code>null</code> if undefined
* @since 2.0
*/
public ISelection getSelection(String partId);
/**
* Removes the given selection listener.
* Has no effect if an identical listener is not registered.
*
* @param listener a selection listener
*/
public void removeSelectionListener(ISelectionListener listener);
/**
* Removes the given part-specific selection listener.
* Has no effect if an identical listener is not registered for the given part id.
*
* @param partId the id of the part to track
* @param listener a selection listener
* @since 2.0
*/
public void removeSelectionListener(String partId,
ISelectionListener listener);
/**
* Removes the given post selection listener.
* Has no effect if an identical listener is not registered.
*
* @param listener a selection listener
*/
public void removePostSelectionListener(ISelectionListener listener);
/**
* Removes the given part-specific post selection listener.
* Has no effect if an identical listener is not registered for the given part id.
*
* @param partId the id of the part to track
* @param listener a selection listener
* @since 2.0
*/
public void removePostSelectionListener(String partId,
ISelectionListener listener);
}
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