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/***************************************************************************************************
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* Copyright (c) 2006 IBM Corporation and others. All rights reserved. This program and the
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* accompanying materials are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors: IBM Corporation - initial API and implementation
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**************************************************************************************************/
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package org.eclipse.ui.internal.navigator;
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import org.eclipse.jface.viewers.ViewerLabel;
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/**
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* Provides a subclass of ViewerLabel that can be re-used for multiple viewer updates.
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*
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* @since 3.2
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*
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*/
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public class ReusableViewerLabel extends ViewerLabel {
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private ViewerLabel original = null;
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/**
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* Creates a ViewerLabel with null text and image.
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*
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*/
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public ReusableViewerLabel() {
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super(null, null);
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}
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/**
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* Updates the Background, Foreground, and Font to the given ViewerLabel. The
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* Text and Image are reset to <b>null</b>.
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*
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* @param theOriginal The ViewerLabel to represent.
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*/
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public void reset(ViewerLabel theOriginal) {
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original = theOriginal;
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setBackground(original.getBackground());
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setFont(original.getFont());
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setForeground(original.getForeground());
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setImage(null);
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setText(null);
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}
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/**
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*
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* @param theOriginal The ViewerLabel to fill with my values.
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*/
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public void fill(ViewerLabel theOriginal) {
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theOriginal.setBackground(getBackground());
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theOriginal.setFont(getFont());
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theOriginal.setForeground(getForeground());
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theOriginal.setImage(getImage());
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theOriginal.setText(getText() != null ? getText() : ""); //$NON-NLS-1$
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}
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/**
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*
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* @return True if the ReusableViewerLabel has different text or image than the original
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* ViewerLabel.
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*/
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public boolean hasChanged() {
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boolean changed = false;
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if(original != null) {
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if(original.getText() == null ^ getText() != null)
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changed |= getText() != null;
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if(original.getText() != null && getImage() != null)
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changed |= !getImage().equals(original.getImage());
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}
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return changed;
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}
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/**
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* @return True if the text is non-null and non-zero in length.
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*/
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public boolean isValid() {
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return getText() != null && getText().length() > 0;
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}
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}
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