/*******************************************************************************
 * 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.eclipse.ui.tests.internal;

import org.eclipse.jface.text.TextSelection;
import org.eclipse.jface.text.source.IVerticalRuler;
import org.eclipse.jface.text.source.SourceViewer;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Composite;

public class ExtendedSourceViewer extends SourceViewer {

    /**
     * Constructs a new source viewer. The vertical ruler is initially visible.
     * The viewer has not yet been initialized with a source viewer configuration.
     *
     * @param parent the parent of the viewer's control
     * @param ruler the vertical ruler used by this source viewer
     * @param styles the SWT style bits
     */
    public ExtendedSourceViewer(Composite parent, IVerticalRuler ruler,
            int styles) {
        super(parent, ruler, styles);
    }

    /*
     * @see Viewer#getSelection()
     */
    @Override
	public ISelection getSelection() {
        Point p = getSelectedRange();
        if (p.x == -1 || p.y == -1) {
			return TextSelection.emptySelection();
		}

        return new ExtendedTextSelection(getDocument(), p.x, p.y);
    }

    /**
     * Sends out a selection changed event to all registered listeners.
     *
     * @param offset the offset of the newly selected range
     * @param length the length of the newly selected range
     */
    @Override
	protected void selectionChanged(int offset, int length) {
        ISelection selection = new ExtendedTextSelection(getDocument(), offset,
                length);
        SelectionChangedEvent event = new SelectionChangedEvent(this, selection);
        fireSelectionChanged(event);
    }
}