org.eclipse.ui.internal.views.markers.MarkersTreeViewer.java Source code

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Here is the source code for org.eclipse.ui.internal.views.markers.MarkersTreeViewer.java

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/*******************************************************************************
 * Copyright (c) 2007, 2009 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.internal.views.markers;

import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Item;
import org.eclipse.swt.widgets.Tree;

/**
 * The MarkersTreeViewer is a viewer that optimizes the expandToLevel method.
 * 
 * @since 3.4
 * 
 */

public class MarkersTreeViewer extends TreeViewer {

    /**
     * Create a new instance of the receiver.
     * 
     * @param parent
     * @param style
     */
    public MarkersTreeViewer(Composite parent, int style) {
        super(parent, style);

    }

    /**
     * Create a new instance of the receiver.
     * 
     * @param parent
     */
    public MarkersTreeViewer(Composite parent) {
        super(parent);
    }

    /**
     * Create a new instance of the receiver.
     * 
     * @param tree
     */
    public MarkersTreeViewer(Tree tree) {
        super(tree);
    }

    /**
     * Remove all of the entries and unmap all of the elements.
     */
    public void removeAndClearAll() {
        removeAll(getControl());
        unmapAllElements();
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.eclipse.jface.viewers.AbstractTreeViewer#doUpdateItem(org.eclipse
     * .swt.widgets.Item, java.lang.Object)
     */
    protected void doUpdateItem(Item item, Object element) {
        super.doUpdateItem(item, element);
        /*
         * For performance reasons clear cache of the item used in updating UI.
         */
        MarkerSupportItem cellItem = (MarkerSupportItem) element;
        if (cellItem.isConcrete())
            cellItem.clearCache();
    }

}