org.eclipse.viatra.addon.viewers.runtime.ViatraViewerSupport.java Source code

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Here is the source code for org.eclipse.viatra.addon.viewers.runtime.ViatraViewerSupport.java

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/*******************************************************************************
 * Copyright (c) 2010-2013, Zoltan Ujhelyi, Istvan Rath and Daniel Varro
 * 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:
 *   Zoltan Ujhelyi - initial API and implementation
 *   Csaba Debreceni - add exception for deprecated methods
 *******************************************************************************/
package org.eclipse.viatra.addon.viewers.runtime;

import org.eclipse.jface.viewers.AbstractListViewer;
import org.eclipse.jface.viewers.AbstractTreeViewer;
import org.eclipse.viatra.addon.viewers.runtime.model.ViewerState;
import org.eclipse.viatra.addon.viewers.runtime.sources.ListContentProvider;
import org.eclipse.viatra.addon.viewers.runtime.sources.QueryLabelProvider;
import org.eclipse.viatra.addon.viewers.runtime.sources.TreeContentProvider;

/**
 * @author Zoltan Ujhelyi
 * 
 */
public class ViatraViewerSupport {

    /**
     * Bind the viewerstate to the list viewer.
     * @param viewer
     * @param state
     */
    public static void bind(AbstractListViewer viewer, ViewerState state) {
        // this seems to be necessary to avoid a databinding-related exception 
        // which comes when the viewer already had some contents before the current run      
        if (viewer.getInput() != null) {
            viewer.setInput(null);
        }

        if (viewer.getContentProvider() != null && viewer.getContentProvider() instanceof ListContentProvider) {
            // dispose already existing content provider
            ((ListContentProvider) viewer.getContentProvider()).dispose();
        }

        if (viewer.getLabelProvider() != null && viewer.getLabelProvider() instanceof QueryLabelProvider) {
            // dispose already existing label provider
            ((QueryLabelProvider) viewer.getLabelProvider()).dispose();
        }

        viewer.setContentProvider(new ListContentProvider());
        viewer.setLabelProvider(new QueryLabelProvider(state, viewer.getControl().getDisplay()));
        viewer.setInput(state);
        viewer.refresh();
    }

    /**
     * Bind the viewerstate to the tree viewer.
     * @param viewer
     * @param state
     */
    public static void bind(AbstractTreeViewer viewer, ViewerState state) {
        // this seems to be necessary to avoid a databinding-related exception 
        // which comes when the viewer already had some contents before the current run
        if (viewer.getInput() != null) {
            viewer.setInput(null);
        }

        if (viewer.getContentProvider() != null && viewer.getContentProvider() instanceof TreeContentProvider) {
            // dispose already existing content provider
            ((TreeContentProvider) viewer.getContentProvider()).dispose();
        }

        if (viewer.getLabelProvider() != null && viewer.getLabelProvider() instanceof QueryLabelProvider) {
            // dispose already existing label provider
            ((QueryLabelProvider) viewer.getLabelProvider()).dispose();
        }

        viewer.setContentProvider(new TreeContentProvider());
        viewer.setLabelProvider(new QueryLabelProvider(state, viewer.getControl().getDisplay()));
        viewer.setInput(state);
        viewer.refresh();
    }
}