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[phpeclipse.git] / net.sourceforge.phpeclipse.xml.ui / src / net / sourceforge / phpeclipse / xml / ui / internal / compare / DTDMergeViewer.java

/*
 * Copyright (c) 2002-2004 Widespace, OU and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 *
 * Contributors:
 *     Igor Malinin - initial contribution
 *
 * $Id: DTDMergeViewer.java,v 1.1 2004-09-02 18:28:05 jsurfer Exp $
 */

package net.sourceforge.phpeclipse.xml.ui.internal.compare;

import org.eclipse.compare.CompareConfiguration;
import org.eclipse.compare.contentmergeviewer.TextMergeViewer;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.preference.PreferenceConverter;
import org.eclipse.jface.text.IDocumentPartitioner;
import org.eclipse.jface.text.TextViewer;
import org.eclipse.jface.text.source.SourceViewer;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.texteditor.AbstractTextEditor;

import net.sourceforge.phpeclipse.xml.ui.XMLPlugin;
import net.sourceforge.phpeclipse.xml.ui.internal.text.DTDConfiguration;
import net.sourceforge.phpeclipse.xml.ui.text.DTDTextTools;

/**
 * @author Igor Malinin
 */
public class DTDMergeViewer extends TextMergeViewer {

        /**
         * The preference store.
         */
        private IPreferenceStore preferenceStore;

        /**
         * The listener for changes to the preference store. 
         */
        private IPropertyChangeListener propertyChangeListener;

        /**
         * The DTD text tools.
         */
        private DTDTextTools textTools;

        /*
         * @see TextMergeViewer#TextMergeViewer(Composite, int, CompareConfiguration)
         */
        public DTDMergeViewer(
                Composite parent, int style, CompareConfiguration configuration
        ) {
                super(parent, style, configuration);
        }

        // TextMergeViewer Implementation ------------------------------------------

        /*
         * @see TextMergeViewer#configureTextViewer()
         */
        protected void configureTextViewer(TextViewer textViewer) {
                XMLPlugin plugin = XMLPlugin.getDefault();

                preferenceStore = plugin.getPreferenceStore();
                if (preferenceStore != null) {
                        propertyChangeListener = new IPropertyChangeListener() {
                                public void propertyChange(PropertyChangeEvent event) {
                                        handlePreferenceStoreChanged(event);
                                }
                        };
                        preferenceStore.addPropertyChangeListener(propertyChangeListener);
                }

                textTools = plugin.getDTDTextTools();

                if (textViewer instanceof SourceViewer) {
                        SourceViewer sourceViewer = (SourceViewer) textViewer;
                        sourceViewer.configure(new DTDConfiguration(textTools));
                }

                updateBackgroundColor();
        }

        /*
         * @see TextMergeViewer#getDocumentPartitioner()
         */
        protected IDocumentPartitioner getDocumentPartitioner() {
                return textTools.createDTDPartitioner();
        }

        /*
         * @see org.eclipse.compare.contentmergeviewer.ContentMergeViewer#getTitle()
         */
        public String getTitle() {
                return XMLPlugin.getResourceString("DTDMergeViewer.title"); //$NON-NLS-1$
        }

        /*
         * @see org.eclipse.jface.viewers.ContentViewer#handleDispose(org.eclipse.swt.events.DisposeEvent)
         */
        protected void handleDispose(DisposeEvent event) {
                if (propertyChangeListener != null) {
                        if (preferenceStore != null) {
                                preferenceStore
                                        .removePropertyChangeListener(propertyChangeListener);
                        }

                        propertyChangeListener = null;
                }

                super.handleDispose(event);
        }

        protected void handlePreferenceStoreChanged(PropertyChangeEvent event) {
                String p = event.getProperty();

                if (p.equals(AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND) ||
                        p.equals(AbstractTextEditor
                                .PREFERENCE_COLOR_BACKGROUND_SYSTEM_DEFAULT)
                ) {
                        updateBackgroundColor();
                } else if (textTools.affectsBehavior(event)) {
                        invalidateTextPresentation();
                }
        }

        private void updateBackgroundColor() {
                boolean defaultBackgroundColor = preferenceStore.getBoolean(
                        AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND_SYSTEM_DEFAULT);

                if (defaultBackgroundColor) {
                        setBackgroundColor(null);
                } else {
                        RGB backgroundColor = PreferenceConverter
                                .getColor(preferenceStore,
                                        AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND);
                        setBackgroundColor(backgroundColor);
                }
        }
}