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/*******************************************************************************
* Copyright (c) 2000, 2010 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.jface.viewers;
/**
* A label provider maps an element of the viewer's model to
* an optional image and optional text string used to display
* the element in the viewer's control. Certain label providers
* may allow multiple labels per element.
* This is an "abstract interface", defining methods common
* to all label providers, but does not actually define the methods
* to get the label(s) for an element. This interface should never
* be directly implemented.
* Most viewers will take either an <code>ILabelProvider</code> or
* an <code>ITableLabelProvider</code>.
* <p>
* A label provider must not be shared between viewers
* since a label provider generally manages SWT resources (images),
* which must be disposed when the viewer is disposed.
* To simplify life cycle management, the current label provider
* of a viewer is disposed when the viewer is disposed.
* </p>
* <p>
* Label providers can be used outside the context of viewers wherever
* images are needed. When label providers are used in this fashion
* it is the responsibility of the user to ensure <code>dispose</code>
* is called when the provider is no longer needed.
* </p>
*
* @see ILabelProvider
* @see ITableLabelProvider
*/
public interface IBaseLabelProvider {
/**
* Adds a listener to this label provider.
* Has no effect if an identical listener is already registered.
* <p>
* Label provider listeners are informed about state changes
* that affect the rendering of the viewer that uses this label provider.
* </p>
*
* @param listener a label provider listener
*/
public void addListener(ILabelProviderListener listener);
/**
* Disposes of this label provider. When a label provider is
* attached to a viewer, the viewer will automatically call
* this method when the viewer is being closed. When label providers
* are used outside of the context of a viewer, it is the client's
* responsibility to ensure that this method is called when the
* provider is no longer needed.
*/
public void dispose();
/**
* Returns whether the label would be affected
* by a change to the given property of the given element.
* This can be used to optimize a non-structural viewer update.
* If the property mentioned in the update does not affect the label,
* then the viewer need not update the label.
*
* @param element the element
* @param property the property
* @return <code>true</code> if the label would be affected,
* and <code>false</code> if it would be unaffected
*/
public boolean isLabelProperty(Object element, String property);
/**
* Removes a listener to this label provider.
* Has no effect if an identical listener is not registered.
*
* @param listener a label provider listener
*/
public void removeListener(ILabelProviderListener listener);
}
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