org.rubypeople.rdt.internal.ui.compare.RubyTextViewer.java Source code

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Here is the source code for org.rubypeople.rdt.internal.ui.compare.RubyTextViewer.java

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/*******************************************************************************
 * Copyright (c) 2000, 2006 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.rubypeople.rdt.internal.ui.compare;

import org.eclipse.compare.IStreamContentAccessor;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.source.SourceViewer;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.rubypeople.rdt.internal.ui.RubyPlugin;
import org.rubypeople.rdt.internal.ui.text.IRubyPartitions;
import org.rubypeople.rdt.ui.text.RubySourceViewerConfiguration;
import org.rubypeople.rdt.ui.text.RubyTextTools;

public class RubyTextViewer extends Viewer {

    private SourceViewer fSourceViewer;
    private Object fInput;

    RubyTextViewer(Composite parent) {
        fSourceViewer = new SourceViewer(parent, null, SWT.LEFT_TO_RIGHT | SWT.H_SCROLL | SWT.V_SCROLL);
        RubyTextTools tools = RubyCompareUtilities.getRubyTextTools();
        if (tools != null) {
            IPreferenceStore store = RubyPlugin.getDefault().getCombinedPreferenceStore();
            fSourceViewer.configure(new RubySourceViewerConfiguration(tools.getColorManager(), store, null,
                    IRubyPartitions.RUBY_PARTITIONING));
        }

        fSourceViewer.setEditable(false);

        String symbolicFontName = RubyMergeViewer.class.getName();
        Font font = JFaceResources.getFont(symbolicFontName);
        if (font != null)
            fSourceViewer.getTextWidget().setFont(font);

    }

    public Control getControl() {
        return fSourceViewer.getControl();
    }

    public void setInput(Object input) {
        if (input instanceof IStreamContentAccessor) {
            Document document = new Document(getString(input));
            RubyCompareUtilities.setupDocument(document);
            fSourceViewer.setDocument(document);
        }
        fInput = input;
    }

    public Object getInput() {
        return fInput;
    }

    public ISelection getSelection() {
        return null;
    }

    public void setSelection(ISelection s, boolean reveal) {
    }

    public void refresh() {
    }

    /**
     * A helper method to retrieve the contents of the given object
     * if it implements the IStreamContentAccessor interface.
     */
    private static String getString(Object input) {

        if (input instanceof IStreamContentAccessor) {
            IStreamContentAccessor sca = (IStreamContentAccessor) input;
            try {
                return RubyCompareUtilities.readString(sca);
            } catch (CoreException ex) {
                RubyPlugin.log(ex);
            }
        }
        return ""; //$NON-NLS-1$
    }
}