/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.tests.internal;

import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Composite;

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;

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()
	 */
	public ISelection getSelection() {
		Point p= getSelectedRange();
		if (p.x == -1 || p.y == -1)
			return ExtendedTextSelection.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
	 */
	protected void selectionChanged(int offset, int length) {
		ISelection selection= new ExtendedTextSelection(getDocument(), offset, length);
		SelectionChangedEvent event= new SelectionChangedEvent(this, selection);
		fireSelectionChanged(event);
	}
}