| package org.eclipse.jface.viewers; |
| |
| /* |
| * (c) Copyright IBM Corp. 2000, 2001. |
| * All Rights Reserved. |
| */ |
| import org.eclipse.jface.util.ListenerList; |
| import org.eclipse.swt.graphics.Image; |
| |
| /** |
| * A label provider implementation which, by default, uses an element's |
| * <code>toString</code> value for its text and <code>null</code> for its image. |
| * <p> |
| * This class may be used as is, or subclassed to provide richer labels. |
| * Subclasses may override any of the following methods: |
| * <ul> |
| * <li><code>isLabelProperty</code></li> |
| * <li><code>getImage</code></li> |
| * <li><code>getText</code></li> |
| * <li><code>dispose</code></li> |
| * </ul> |
| * </p> |
| */ |
| public class LabelProvider implements ILabelProvider { |
| private ListenerList listeners = new ListenerList(1); |
| /** |
| * Creates a new label provider. |
| */ |
| public LabelProvider() { |
| } |
| /* (non-Javadoc) |
| * Method declared on IBaseLabelProvider. |
| */ |
| public void addListener(ILabelProviderListener listener) { |
| listeners.add(listener); |
| } |
| /** |
| * The <code>LabelProvider</code> implementation of this |
| * <code>IBaseLabelProvider</code> method does nothing. Subclasses may extend. |
| */ |
| public void dispose() { |
| } |
| /** |
| * Fires a label provider changed event to all registered listeners |
| * Only listeners registered at the time this method is called are notified. |
| * |
| * @param event a label provider changed event |
| * |
| * @see ILabelProviderListener#labelProviderChanged |
| */ |
| protected void fireLabelProviderChanged(LabelProviderChangedEvent event) { |
| Object[] listeners = this.listeners.getListeners(); |
| for (int i = 0; i < listeners.length; ++i) { |
| ((ILabelProviderListener) listeners[i]).labelProviderChanged(event); |
| } |
| } |
| /** |
| * The <code>LabelProvider</code> implementation of this |
| * <code>ILabelProvider</code> method returns <code>null</code>. Subclasses may |
| * override. |
| */ |
| public Image getImage(Object element) { |
| return null; |
| } |
| /** |
| * The <code>LabelProvider</code> implementation of this |
| * <code>ILabelProvider</code> method returns the element's <code>toString</code> |
| * string. Subclasses may override. |
| */ |
| public String getText(Object element) { |
| return element == null ? "" : element.toString();//$NON-NLS-1$ |
| } |
| /** |
| * The <code>LabelProvider</code> implementation of this |
| * <code>IBaseLabelProvider</code> method returns <code>true</code>. Subclasses may |
| * override. |
| */ |
| public boolean isLabelProperty(Object element, String property) { |
| return true; |
| } |
| /* (non-Javadoc) |
| * Method declared on IBaseLabelProvider. |
| */ |
| public void removeListener(ILabelProviderListener listener) { |
| listeners.remove(listener); |
| } |
| } |