org.eclipse.pde.internal.ui.compare.PluginContentMergeViewer.java Source code

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Here is the source code for org.eclipse.pde.internal.ui.compare.PluginContentMergeViewer.java

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/*******************************************************************************
 *  Copyright (c) 2005, 2014 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.pde.internal.ui.compare;

import java.util.ArrayList;
import java.util.Iterator;
import org.eclipse.compare.CompareConfiguration;
import org.eclipse.compare.contentmergeviewer.TextMergeViewer;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.text.IDocumentPartitioner;
import org.eclipse.jface.text.TextViewer;
import org.eclipse.jface.text.rules.FastPartitioner;
import org.eclipse.jface.text.source.SourceViewer;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.pde.internal.ui.PDEPlugin;
import org.eclipse.pde.internal.ui.PDEUIMessages;
import org.eclipse.pde.internal.ui.editor.context.XMLDocumentSetupParticpant;
import org.eclipse.pde.internal.ui.editor.text.*;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.widgets.Composite;

public class PluginContentMergeViewer extends TextMergeViewer {

    private IColorManager fColorManager;
    private ArrayList<IPropertyChangeListener> fPropertyChangedListeners;

    public PluginContentMergeViewer(Composite parent, CompareConfiguration config) {
        super(parent, SWT.LEFT_TO_RIGHT, config);
    }

    protected void configureTextViewer(final TextViewer textViewer) {
        if (textViewer instanceof SourceViewer) {
            if (fColorManager == null)
                fColorManager = ColorManager.getDefault();
            final XMLConfiguration configuration = new XMLConfiguration(fColorManager);
            textViewer.getControl().addDisposeListener(new DisposeListener() {
                public void widgetDisposed(DisposeEvent e) {
                    configuration.dispose();
                }
            });
            IPropertyChangeListener propertyChangedListener = new IPropertyChangeListener() {
                public void propertyChange(PropertyChangeEvent event) {
                    // the configuration will test if the properties affect the presentation also,
                    // but checking it here allows us to prevent the viewer from being invalidated
                    // and saves some unnecessary work
                    if (configuration.affectsColorPresentation(event)
                            || configuration.affectsTextPresentation(event)) {
                        configuration.adaptToPreferenceChange(event);
                        textViewer.invalidateTextPresentation();
                    }
                }
            };
            PDEPlugin.getDefault().getPreferenceStore().addPropertyChangeListener(propertyChangedListener);

            if (fPropertyChangedListeners == null)
                fPropertyChangedListeners = new ArrayList<IPropertyChangeListener>(3);
            fPropertyChangedListeners.add(propertyChangedListener);
            ((SourceViewer) textViewer).configure(configuration);
            Font font = JFaceResources.getFont(PluginContentMergeViewer.class.getName());
            if (font != null)
                ((SourceViewer) textViewer).getTextWidget().setFont(font);
        }
    }

    protected IDocumentPartitioner getDocumentPartitioner() {
        return new FastPartitioner(new XMLPartitionScanner(), XMLPartitionScanner.PARTITIONS);
    }

    protected String getDocumentPartitioning() {
        return XMLDocumentSetupParticpant.XML_PARTITIONING;
    }

    public String getTitle() {
        return PDEUIMessages.PluginContentMergeViewer_title;
    }

    protected void handleDispose(DisposeEvent event) {
        super.handleDispose(event);
        if (fColorManager != null)
            fColorManager.dispose();
        if (fPropertyChangedListeners != null) {
            Iterator<IPropertyChangeListener> iter = fPropertyChangedListeners.iterator();
            while (iter.hasNext())
                PDEPlugin.getDefault().getPreferenceStore().removePropertyChangeListener(iter.next());
            fPropertyChangedListeners = null;
        }
    }
}