org.eclipse.wst.server.ui.internal.viewers.BaseCellLabelProvider.java Source code

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Here is the source code for org.eclipse.wst.server.ui.internal.viewers.BaseCellLabelProvider.java

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/*******************************************************************************
 * Copyright (c) 2003, 2011 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.wst.server.ui.internal.viewers;

import org.eclipse.jface.viewers.*;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.ui.PlatformUI;

/**
 * A basic cell label provider.
 */
public abstract class BaseCellLabelProvider extends ColumnLabelProvider {
    public ILabelDecorator decorator;
    protected ILabelProviderListener providerListener;

    /* (non-Javadoc)
     * @see org.eclipse.jface.viewers.ColumnLabelProvider#update(org.eclipse.jface.viewers.ViewerCell)
     */
    public void update(ViewerCell cell) {
        super.update(cell);
        Object element = cell.getElement();
        int index = cell.getColumnIndex();
        cell.setText(getColumnText(element, index));
        Image image = getColumnImage(element, index);
        cell.setImage(image);
    }

    /**
     * Create a BaseCellLabelProvider
     */
    public BaseCellLabelProvider() {
        super();
    }

    /**
     * Create a BaseCellLabelProvider with a decorator at the front of the row
     * @param decorator
     */
    public BaseCellLabelProvider(ILabelDecorator decorator) {
        super();

        this.decorator = getDecorator();
    }

    public Point getToolTipShift(Object object) {
        return new Point(5, 5);
    }

    public int getToolTipDisplayDelayTime(Object object) {
        return 2000;
    }

    public int getToolTipTimeDisplayed(Object object) {
        return 5000;
    }

    public void dispose() {
        if (decorator != null && providerListener != null) {
            decorator.removeListener(providerListener);
        }
        super.dispose();
    }

    public ILabelDecorator getDecorator() {
        if (decorator == null) {
            decorator = PlatformUI.getWorkbench().getDecoratorManager().getLabelDecorator();
            providerListener = new ILabelProviderListener() {
                @SuppressWarnings("synthetic-access")
                public void labelProviderChanged(LabelProviderChangedEvent event) {
                    fireLabelProviderChanged(event);
                }
            };
            decorator.addListener(providerListener);
        }
        return decorator;
    }

    /**
     * Extenders of this class would implement this method to provide an image to the column based on the element 
     * being passed
     * @param element
     * @param index
     * @return an image
     */
    public abstract Image getColumnImage(Object element, int index);

    /**
     * Extenders of this class would implement this method to provide a text label to the column based on the element
     * being passed 
     * @param element
     * @param index
     * @return a string
     */
    public abstract String getColumnText(Object element, int index);
}